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235 Commits

Author SHA1 Message Date
Greg Johnston
c317bc1e5c feat: add .write() and .read() for signals 2023-09-08 11:30:09 -04:00
Baptiste
b3a4c95dad feat: Rc-backed ChildrenFn (#1669) 2023-09-08 07:44:50 -04:00
Greg Johnston
de44b1f91f Merge pull request #1673 from martinfrances107/router_version_bump
Router version bump
2023-09-08 07:43:47 -04:00
Greg Johnston
689022661d change: move logging macros into a logging module to avoid name conflicts with log and tracing (#1658) 2023-09-08 07:42:58 -04:00
Joseph Cruz
905d46a09d refactor(examples): extract client process tasks (#1665) (#1666)
* doc(test-report): report trunk and node

* refactor(examples): extract client process tasks

* chore(exaples): force ci
2023-09-08 07:31:55 -04:00
martinfrances107
5585f20940 chore: Bumped a few outdated packages.
-cached = { version = "0.44.0", optional = true }
+cached = { version = "0.45.0", optional = true }
-lru = { version = "0.10", optional = true }
+lru = { version = "0.11", optional = true }
2023-09-08 09:30:13 +01:00
martinfrances107
5c3ed3f018 Chore: Bump to actions/checkout@v4 2023-09-08 08:28:01 +01:00
Greg Johnston
03cabf6ea3 chore: create SECURITY.md 2023-09-06 21:19:33 -04:00
SleeplessOne1917
2798dc455f examples: use cargo-leptos Tailwind support in Tailwind examples (#1625) 2023-09-06 07:25:00 -04:00
Florian Wickert
db20be5576 fix: compare path components to detect active link in router (#1656) 2023-09-06 06:49:10 -04:00
Nya
495862e9f9 fix: custom events on components (#1648) 2023-09-04 13:27:33 -04:00
Joseph Cruz
2ca1c51fdc test(error_boundary): add e2e testing (#1651)
* test(error_boundary): open app

* test(error_boundary): click up arrow

* test(error_boundary): click down arrow

* test(error_boundary): type number

* test(error_boundary): clear number

* fix(build): clean trunk directories

* fix(test-report): detect unit tests

* ci(build): echo stop trunk
2023-09-04 13:25:44 -04:00
Greg Johnston
70e1ad41e2 Merge pull request #1579 from leptos-rs/rusty
feat: start adding some Rustier interfaces for reactive types
2023-09-04 13:23:18 -04:00
Greg Johnston
53ec7ed272 feat: add Effect::with_value_mut() 2023-09-04 11:14:07 -04:00
Greg Johnston
d98a577740 feat: add Rustier interfaces for reactive system types 2023-09-04 11:05:23 -04:00
jquesada2016
fd834f48c2 change: rename .derived_signal() and .mapped_signal_setter() methods (#1637) 2023-09-04 08:41:41 -04:00
Greg Johnston
7be65a37c6 fix: versioned resources never decrement Suspense (closes #1640) (#1641) 2023-09-03 20:21:16 -04:00
Banzobotic
3b5e2d86fb docs: clean up messy spacing left over from cx replacements (#1626) 2023-09-03 20:21:05 -04:00
jquesada2016
716b9fb50b feat: add .into_X_boxed() for classes, properties, and styles as for attributes 2023-09-03 20:18:49 -04:00
jquesada2016
006ca13797 chore: hide get_property (#1638) 2023-09-03 20:15:15 -04:00
Village
6e008343c8 feat: add component generics (#1636) 2023-09-03 20:09:50 -04:00
Greg Johnston
2ca24883ac fix: memoize Suspense readiness to avoid rerendering children/fallback (#1642) 2023-09-03 20:07:20 -04:00
Village
4a43983f4e feat: implement spreading attributes onto elements (#1619) 2023-09-01 20:52:15 -04:00
IcosaHedron
d9e83121c1 feat: add reload websocket configuration and enable env configuration (#1613) 2023-09-01 20:51:46 -04:00
Antonin Peronnet
f5b4b97c9b feat: Callback types to make it easier to accept (optional) callback props (#1596) 2023-09-01 20:51:32 -04:00
Gareth
bcfa430a40 docs: fix incorrect variable name (#1623) 2023-09-01 07:39:41 -04:00
Lawrence Qupty
7c51815cf5 docs: remove extra space (#1622) 2023-09-01 07:39:05 -04:00
Dmitry Pytaylo
fee2fb953b docs: fix typo (#1618) 2023-09-01 07:37:52 -04:00
Sadra M
8ecb7f59c4 docs: update references to server binary in dockerfile (#1617) 2023-09-01 07:37:24 -04:00
martin frances
b85cb9fb3b docs: clarify how many times derived signals are called (#1614) 2023-09-01 07:36:15 -04:00
Joseph Cruz
a631c5ca1c doc(examples): report fantoccini use (#1616) 2023-09-01 07:35:29 -04:00
Greg Johnston
bee9bd8f67 0.5.0-beta2 2023-08-29 21:23:59 -04:00
Greg Johnston
8d3874f8a9 cargo fmt 2023-08-29 21:19:24 -04:00
Einherjar
bade16d227 docs: discuss unique paths for #[server] functions (#1610) 2023-08-29 20:49:31 -04:00
Jon Cahill
e0a132bde3 fix: don't try to parse as JSON the result from a server function redirect (#1604) 2023-08-29 20:42:19 -04:00
Daniel Oliveira
4d7e1f4d26 feat: improve server function client side error handling (#1597)
Handle all error codes 401-499 in addition to the
400 and 500-599 that were already handled.

In addition, handle them all in the same way
and improve the error message.
2023-08-29 20:40:03 -04:00
Maneren
700eee6604 fix(macro/params): clippy warning (#1612) 2023-08-29 20:31:54 -04:00
Joseph Cruz
694ed61e4c fix(ci): add new webkit dependency (#1607) (#1608) 2023-08-28 11:08:47 -04:00
Joseph Cruz
d7330097ba chore(examples): improve cucumber support #1598 (#1599)
* chore(examples): add cucumber runner

* chore(examples): clean cargo recursively
2023-08-28 11:08:22 -04:00
Greg Johnston
c65a3a6ca3 docs: add docs for builder syntax (#1603) 2023-08-28 11:08:07 -04:00
Danik Vitek
793c191619 feat: Oco (Owned Clones Once) smart pointer (#1480) 2023-08-26 11:43:51 -04:00
Greg Johnston
6c3e2fe53e feat: update to typed-builder 0.16 (closes #1455) (#1590) 2023-08-26 10:10:42 -04:00
Greg Johnston
08c419e3ee fix: broken test with untrack in tracing props (#1593) 2023-08-26 09:20:14 -04:00
Greg Johnston
736f4185b5 Merge pull request #1588 from leptos-rs/1457
Some resource and transition fixes
2023-08-26 07:34:21 -04:00
Greg Johnston
9cc0fc8c49 fix: adjust tracing properties 2023-08-26 07:24:52 -04:00
Greg Johnston
8f067dcde7 chore: clear release-mode warnings 2023-08-25 17:16:00 -04:00
Greg Johnston
ad6eb58fe1 fix: <Transition/> fallback in CSR 2023-08-25 17:12:01 -04:00
Greg Johnston
3f3ab1c3c8 remove unnecessary parens 2023-08-25 16:49:26 -04:00
Greg Johnston
9adae32847 examples: improve hackernews behavior 2023-08-25 16:00:47 -04:00
Greg Johnston
b8098e7992 fix: <Transition/> fallback on non-initial page loads 2023-08-25 16:00:47 -04:00
Greg Johnston
bef4d0dd3b fix: resource loading signal pattern for subsequent hydration page loads 2023-08-25 16:00:47 -04:00
Matt Cuneo
a789100e22 feat: allow autoreload websocket connection to work outside of localhost (#1548)
* Updated client reloading to use window.location.protocol/host to determine websocket connection. Added optional config reload_external_port to provide further control of the client websocket connection. These changes allow reloading while accessing the served site from outside of localhost.
2023-08-25 15:54:22 -04:00
Greg Johnston
abeca70625 fix: correct logic for resource loading signal when read outside suspense (#1586) 2023-08-25 11:46:54 -04:00
rkuklik
cc293b1170 feat: generic event handler types to make it easier to create collections of event handlers (#1444) 2023-08-25 11:41:16 -04:00
Greg Johnston
8ab62c17c6 feat: add Fn traits for resources on nightly (#1587) 2023-08-25 11:20:29 -04:00
Joseph Cruz
cf14e857ca refactor(check-stable): use matrix (#1543) (#1583)
* refactor(check-stable): use matrix

* chore: simulate leptos change

* chore: remove simulated change
2023-08-25 10:30:00 -04:00
Greg Johnston
c322ef38fd feat: signal traits should take associated types instead of generics (#1578) 2023-08-25 10:29:24 -04:00
Greg Johnston
c9cc493063 fix: fourth argument to server functions (#1585) 2023-08-25 10:28:54 -04:00
Joseph Cruz
fb48f7f117 fix(counters_stable): restore wasm tests (#1581) (#1582) 2023-08-24 16:33:01 -04:00
尹吉峰
c344e54cf6 feat: return an Effect from create_effect that can be disposed (#1571) 2023-08-24 10:24:10 -04:00
Greg Johnston
7306ecccbc feat: make struct name and path optional for server functions (#1573) 2023-08-24 10:22:35 -04:00
Greg Johnston
b98174db7a feat: support passing signals directly as attributes, classes, styles, and props on stable (#1577) 2023-08-24 10:22:14 -04:00
Greg Johnston
e48f66694d fix: runtime disposal time in render_to_string_async (#1574) 2023-08-24 10:22:00 -04:00
Mark Catley
533fccd1d3 fix: nightly warning in server macro for lifetime (#1580)
On the latest lifetime we're getting the following warning in the server
macro:
 warning: `&` without an explicit lifetime name cannot be used here
   --> src/login.rs:19:1
    |
 19 | #[server(Login, "/api")]
    | ^
    |
    = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
    = note: for more information, see issue #115010 <https://github.com/rust-lang/rust/issues/115010>
    = note: this warning originates in the attribute macro `server` (in Nightly builds, run with -Z macro-backtrace for more info)
2023-08-24 06:30:13 -04:00
Greg Johnston
ec4bd7600f fix: suppress warning about non-reactivity when calling .refetch() (occurs in e.g., async blocks in actions) (#1576)
* fix: suppress warning about non-reactivity when calling `.refetch()` (occurs in e.g., async blocks in actions)

* fix: don't reenter reactivity if these are nested
2023-08-23 20:57:05 -04:00
Greg Johnston
65d4e98d38 fix: INFO is too high a level for this prop tracing (#1570) 2023-08-23 06:39:37 -04:00
Nathan Lapel
195b843840 feat: remove Clone requirement for slots in vectors (#1564) 2023-08-22 21:23:38 -04:00
Joseph Cruz
00ac66e450 refactor(verify-changed-examples): improve readability and runtime (#1556)
* refactor(workflows): split setup

* test((verify-changed-examples): simulate  change

* refactor(verify-changes-examples): inline os setup

* refactor(verify-changed-examples): skip w/o change

* chore(verify-changed-examples): remove simulated change

* refactor(verify-changed-examples): revert inline

* refactor(verify-changes-examples): extract example changed

* fix(verify-changed-examples): pull up example changed

* refactor(verify-change-examples): extract matrix

* refactor(verify-changed-examples): pass input

* refactor(verify-changed-examples): rename workflow

* ci(workflows): install chromedriver if needed

* fix(ci-changed-examples): pass input from json

* perf(run-cargo-make-task): maybe install chromedriver

* fix((run-cargo-make-task): maybe install chromedriver

* perf(run-cargo-make-task): maybe install playwrigh deps

* fix(run-cargo-make-task): maybe install playwrigh deps

* chore(suspsense_tests): retry e2e

* refactor(verify-changed-examples): rename calls

* refactor(run-cargo-make-test): remove playwright count
2023-08-22 21:22:13 -04:00
Joseph Cruz
351701036b refactor(workflows): extract calls (#1566)
* refactor(workflows): extract leptos changed

* refactor(workflows): rename matrix job

* refactor(workflows): extract examples matrix

* chore(workflows): simulate leptos change

* chore(workflows): remove simulated leptos change
2023-08-22 21:19:58 -04:00
Greg Johnston
2bead5dadd docs: note 0.4 vs 0.5 in README.md 2023-08-21 19:35:23 -04:00
Greg Johnston
dbc707adcd feat/change: adopt reactive ownership model and drop cx/Scope (#918) 2023-08-21 19:31:37 -04:00
Greg Johnston
5066242ef3 remove file accidentally included from islands branch 2023-08-20 19:52:47 -04:00
Greg Johnston
e9deff52a7 v0.4.9 2023-08-20 14:27:49 -04:00
Greg Johnston
eb3d9b8714 build(docs): only publish on new version tags (#1562) 2023-08-20 09:38:35 -04:00
luoxiaozero
18deb398ca feat: tracing support for component props (#1531) 2023-08-18 08:29:41 -04:00
Geert Stappers
d9abebb4be docs: add link to source code for book 2023-08-18 07:57:38 -04:00
Jonathan
a480db8b77 <Show/> update (#1557) 2023-08-18 07:50:26 -04:00
Greg Johnston
1f26b68d45 docs: inner_html in book 2023-08-16 21:31:06 -04:00
Greg Johnston
937501c61b docs: add note about #[component(transparent)] 2023-08-16 21:26:53 -04:00
Joseph Cruz
5523fb86fb perf(check-stable): only run on source change (#1542) 2023-08-15 06:20:01 -04:00
Joseph Cruz
7dcfcf8ca8 chore(test_examples): remove obsolete directory (#1540) 2023-08-15 06:19:36 -04:00
Joseph Cruz
087c68569a test(suspense-tests): add e2e tests (Closes #1519) (#1533)
* test(suspense-tests): add e2e tests (closes #1519)

test(suspense_tests): load nested

test(suspense_tests): load parallel

test(suspsense_tests): load nested inside

test(suspense_tests): load single

test(suspense_tests): load inside component

test(suspense_tests): load no resources

test(suspense_tests): click nested count

test(suspense_tests): click inside component count

test(suspense_tests): click nested inside count

test(suspense_tests): click single count

test(suspense_tests): click parallel counts

test(suspense_tests): click no resources count

refactor(suspense_tests): change view strategy

* fix(suspense_tests): let_unit_value
2023-08-15 06:19:20 -04:00
Milo Moisson
6abfdd2345 examples: on_cleanup misorder? in fetch examples (#1532)
* Update api.rs

* fix: second hackernews example
2023-08-15 06:18:38 -04:00
martin frances
cddd784e8d chore: fixed lint warning seen while running ``cargo doc`` (#1539)
"component" is both a module and a macro and so we must
disambiguate
2023-08-15 06:18:19 -04:00
Greg Johnston
f6978217fb docs: give a compile error when trying to put a child inside a self-closing HTML tag (closes #1535) (#1537) 2023-08-13 12:44:45 -04:00
Greg Johnston
aa58cedc15 Merge pull request #1529 from leptos-rs/docs-advanced-reactivity
Add advanced docs on reactive graph, and update testing docs
2023-08-11 13:52:08 -04:00
Greg Johnston
a0b0d72d19 docs: update testing section 2023-08-11 13:51:10 -04:00
Greg Johnston
fa8d0945e0 docs: add section on reactive graph internals 2023-08-11 13:36:27 -04:00
Greg Johnston
3ed49381e3 docs: expand on the need for prop:value (#1526) 2023-08-10 14:59:12 -04:00
Greg Johnston
8ec3fb95f0 docs: typos in NavigateOptions docs (#1525) 2023-08-09 20:44:39 -04:00
Greg Johnston
cc11430d16 docs: add use_navigate to router docs in guide (#1524) 2023-08-09 20:44:31 -04:00
Greg Johnston
0b650ee2dc Merge pull request #1523 from leptos-rs/more-docs
Additional random docs
2023-08-09 20:24:48 -04:00
Greg Johnston
4def35cb45 docs: add <Await/> 2023-08-09 20:24:04 -04:00
Greg Johnston
0e56f27e0d docs: add watch 2023-08-09 20:19:12 -04:00
Greg Johnston
bd8983f462 docs: expand docs on Axum State/FromRef pattern 2023-08-09 20:14:37 -04:00
Greg Johnston
7ef635d9cf docs: deployment 2023-08-09 20:09:54 -04:00
Joseph Cruz
19ea6fae6a test(todo_app_sqlite_axum): add e2e tests (#1514) (#1515)
* refactor(examples): pull up cargo leptos tasks

* test(todo_app_sqlite_axum): add e2e tests
2023-08-09 08:37:28 -04:00
Joseph Cruz
651a111db9 fix(suspense-tests): build errors (#1517) (#1518) 2023-08-09 08:36:25 -04:00
Danik Vitek
3a98bdb3c2 fix: use current pathname for create_query_signal (#1508) 2023-08-07 20:25:22 -04:00
Greg Johnston
f01b982cff fix: render empty dynamic text node in HTML as (closes #1382) (#1507) 2023-08-07 18:04:56 -04:00
Joseph Cruz
69dd96f76f test(todo_app_sqlite): add e2e tests (#1448) (#1467) 2023-08-07 17:51:24 -04:00
starmaker
329ae08e60 chore: enable stable support for rkyv feature (#1503) 2023-08-07 08:54:02 -04:00
Greg Johnston
1e13ad8fee perf: in hydration, reuse existing text node rather than destroying and remounting (#1506) 2023-08-07 08:34:10 -04:00
Geert Stappers
e0c9a9523a docs: typo
Signed-off-by: Geert Stappers <stappers@stappers.nl>
2023-08-04 10:56:51 -04:00
Mark Catley
0726a3034d examples: fix github links (#1493) 2023-08-04 07:55:04 -04:00
Greg Johnston
a88d047eff template refactor + snapshot tests (#1435) 2023-08-04 07:54:03 -04:00
mateusvmv
4001561987 fix: scoping of JS variable names in inline scripts (#1489) 2023-08-03 08:46:06 -04:00
Greg Johnston
2f860b37bd v0.4.8 2023-08-02 19:25:32 -04:00
Greg Johnston
b86009b9d0 fix: remove erroneous logging 2023-08-02 19:16:32 -04:00
Greg Johnston
54733e1b34 v0.4.7 2023-08-02 17:03:38 -04:00
Greg Johnston
56f01888b7 Merge pull request #1486 from leptos-rs/export-all-helpers
fix: correctly export all DOM helpers
2023-08-02 17:02:19 -04:00
Greg Johnston
8320f16716 chore: fix new clippy warnings 2023-08-02 16:05:42 -04:00
Greg Johnston
0b16e5992d fix: correctly export all DOM helpers 2023-08-02 14:41:54 -04:00
Danik Vitek
248beb4a55 docs: typo in docs for ServerFnErrorErr (#1477) 2023-08-01 14:27:39 -04:00
martin frances
c9f608d030 docs: fix doclink to Error (#1469) 2023-08-01 13:24:13 -04:00
Greg Johnston
f837d3e6a2 fix: correctly escape HTML in DynChild text nodes (closes #1475) (#1478) 2023-08-01 13:22:24 -04:00
Greg Johnston
8847d5fc42 fix: compile-time regression for deeply-nested component trees (#1476) 2023-07-31 14:23:09 -04:00
Greg Johnston
7819a6fac0 fix: properly replace text nodes in DynChild (closes #1456) (#1472) 2023-07-30 22:37:53 -04:00
Marco Inacio
c199185808 docs: README.md to reflect new version (#1470) 2023-07-30 11:52:09 -04:00
martin frances
e0b5738606 chore: document the magic number in FILTER_SHOW_COMMENT. (#1468) 2023-07-29 16:53:10 -04:00
Sebastian Dobe
f3e3880a57 fix: AnimatedShow - possible panic on cleanup (#1464) 2023-07-29 06:33:49 -04:00
Greg Johnston
d44b90c16d feat: allow mut in component props and suppress "needless lifetime" warning (closes #1458) (#1459) 2023-07-29 06:32:06 -04:00
Joseph Cruz
cc32a3e863 perf(examples): speed up the test-info report (#1446) (#1447) 2023-07-27 20:40:26 -04:00
Greg Johnston
5740c9b76b feat: add MaybeProp type (#1443) 2023-07-27 18:18:25 -04:00
Greg Johnston
80fa6ad3eb docs: fix typo in 23_ssr_modes.md (#1445) 2023-07-26 16:33:21 -04:00
Greg Johnston
7bc1ad2b4f fix: incorrect opening node for <Each/> in debug mode (closes #1168) (#1436) 2023-07-26 10:43:46 -04:00
Joseph Cruz
82a2fe7cbe fix(examples): unable to parse makefile (#1440) (#1441) 2023-07-26 10:43:20 -04:00
Bechma
40bf944957 docs: expand spawn_local documentation (#1433) 2023-07-25 11:42:48 -04:00
Greg Johnston
7ef7546fa9 v0.4.6 2023-07-25 06:08:53 -04:00
Greg Johnston
5e26e84d77 feat: allow feature-name flexibility when using server functions (#1427) 2023-07-25 06:07:52 -04:00
mforsb
e67bc2083a feat: add noscroll attribute to Form, ActionForm (#1432) 2023-07-25 06:07:37 -04:00
g-re-g
a3cb3f7f77 perf: use binary search for event and tag names in view macro (#1430) 2023-07-24 15:06:34 -04:00
Greg Johnston
daeb47e72e build(examples): update Makefiles for recent examples (#1431) 2023-07-24 12:02:30 -04:00
Joseph Cruz
8c5ab99fa7 build(examples): pull up compile tasks (#1417)
* build(examples): pull up compile tasks

* build(examples): set toolchain for compiles tasks

* build(examples): set toolchain for build and check

* build(examples): set toolchain of other examples
2023-07-24 11:35:34 -04:00
Greg Johnston
984a7388f1 fix: clear <title> correctly when navigating between pages (closes #1369) (#1428) 2023-07-24 11:25:28 -04:00
Greg Johnston
274b105676 docs: fix messed up component closing tags router docs 2023-07-24 11:24:58 -04:00
Greg Johnston
a689d1b4c0 docs: note on optional generic component props 2023-07-24 07:52:40 -04:00
Greg Johnston
1581e91317 docs: note on how to opt out of client-side routing 2023-07-24 07:52:29 -04:00
Andrew Grande
20f4034c1c docs: proofreading and fixing the links (#1425)
* Update 23_ssr_modes.md

Fixed grammar, added the section anchor links

* Fixed a broken link

The github link doesn't get properly rendered in the Leptos book site. Make the book work, 'break' the github link.

* Update 26_extractors.md

Fixed broken Axum links. Added an Axum extract function doc link for consistency (had Actix, but not Axum before)
2023-07-24 07:25:02 -04:00
Jason Hansen
9fb1c4b67c docs/warnings: fix warning message about updating a signal after it has been disposed (#1423)
* Remove "either" because it didn't make sense in the sentence
* Change "cause cause" to "not cause"
2023-07-24 07:24:06 -04:00
Ari Seyhun
2e559d6a06 feat: add create_query_signal for URL-synced signals (#1377) 2023-07-23 12:20:15 -04:00
Sebastian Dobe
71de6c395b feat: create a <AnimatedShow> component (closes #1370) (#1386) 2023-07-23 07:46:47 -04:00
Vladimir Motylenko
b09f9e4814 feat: Update rstml to v0.11.0 (#1416) 2023-07-23 07:46:33 -04:00
Greg Johnston
ec4bfb0e8a chore: resolve clippy incorrect_clone_impl_on_copy_type (closes #1401) (#1418) 2023-07-22 22:14:52 -04:00
Greg Johnston
39bf38d1e4 docs: CONTRIBUTING.md with helpful info re: CI (#1415) 2023-07-22 08:26:46 -04:00
Joshua Marsh
e6fd1379b8 docs: fix typo for WrapsChildren (#1402) 2023-07-22 08:26:36 -04:00
Doug A
1d9931a5a8 docs: typo in 01_basic_component.md (#1412)
typo fix
2023-07-22 08:24:30 -04:00
Greg Johnston
06164d34b5 docs: note about typed params on stable (#1414) 2023-07-22 08:23:05 -04:00
Joseph Cruz
f3de288e19 build(examples): make it easy to see which examples do what kind of testing (#1411)
* build(examples): list example projects with CI tests runners

* build(examples): add show all mode
2023-07-22 08:13:49 -04:00
Greg Johnston
62bf315059 fix: <use_/> as typed top-level element in view (#1410) 2023-07-21 10:07:34 -04:00
Greg Johnston
011c97e3a4 fix: closing element names wrong for svg::, math::, and use_ (closes #1403) (#1406) 2023-07-20 17:03:30 -04:00
Greg Johnston
2ca3d2c7a4 fix: RawText/unquoted text nodes in SSR (closes #1384) (#1407) 2023-07-20 17:03:19 -04:00
Greg Johnston
cc52c94348 docs/examples: use shorthand form for <Route/> views when possible (#1375) 2023-07-20 16:28:43 -04:00
Andrew Grande
4b8cc96dfa docs: typo in 16_routes.md
Fixed grammar
2023-07-20 16:13:25 -04:00
Greg Johnston
338d2ab839 Merge pull request #1379 from agilarity/lint-with-clippy
ci: lint with clippy
2023-07-20 14:15:16 -04:00
Greg Johnston
54fc6da24e feat: implement Resource::dispose() (#1393) 2023-07-20 14:14:49 -04:00
Andrew Grande
825b3fb858 chore: typo in README.md (#1399) 2023-07-20 14:00:43 -04:00
Andrew Grande
fd0212a142 docs: typo in 15_global_state.md (#1395)
Proofreading
2023-07-20 08:57:12 -04:00
Greg Johnston
3b397cb39c examples: remove random <form> (#1398) 2023-07-20 08:56:49 -04:00
martin frances
1e002c2c2f chore: Removed call to .into(), plus minor touch to docs. (#1396) 2023-07-20 08:07:31 -04:00
Greg Johnston
8f45daeca8 docs: correct docs for create_memo to reflect laziness (#1388) 2023-07-19 14:50:34 -04:00
Joseph Cruz
105ef989b7 ci: install clippy 2023-07-19 08:54:05 -04:00
Greg Johnston
9e7c31d1e4 docs: small issues (#1385) 2023-07-19 08:53:37 -04:00
Joseph Cruz
771dfa6b68 ci: lint with clippy 2023-07-19 08:44:36 -04:00
Joseph Cruz
fb52cfa73e fix: needless_raw_string_hashes 2023-07-19 08:43:57 -04:00
Ari Seyhun
b2c75d215b chore: remove unnecessary string allocation in TryFrom for Url (#1376) 2023-07-19 07:04:06 -04:00
Andrew Grande
951607de74 docs: typos
* Fixed wording

* Update ARCHITECTURE.md

Fixed superfluous whitespace
2023-07-19 07:03:50 -04:00
Joseph Cruz
122fd2bc74 fix: useless_conversion 2023-07-18 20:56:55 -04:00
Joseph Cruz
f102125d3c fix: needless_borrow 2023-07-18 20:56:55 -04:00
Joseph Cruz
14bda76b30 fix: needless_raw_string_hashes (allow) 2023-07-18 20:56:39 -04:00
Joseph Cruz
3af115a663 fix: maybe_misused_cfg 2023-07-18 20:56:39 -04:00
Joseph Cruz
a344804734 fix: incorrect_clone_impl_on_copy_type (allow) 2023-07-18 20:54:51 -04:00
Greg Johnston
c1c49ce53b v0.4.5 2023-07-18 14:02:56 -04:00
Joseph Cruz
d8eaa5c004 build: use cargo hack for clippy 2023-07-18 08:02:24 -04:00
Greg Johnston
e8aa9b24f1 fix: memory leak in leptos_axum (#1374) 2023-07-17 21:59:20 -04:00
Greg Johnston
3036cd223e v0.4.4 2023-07-17 17:33:44 -04:00
Greg Johnston
1ae5150b08 fix: release lock on stored values during update/set (#1373) 2023-07-17 14:19:03 -04:00
Greg Johnston
47148f2033 perf: exclude hydration code in CSR mode (#1372) 2023-07-17 12:20:33 -04:00
Sebastian Probst Eide
4d4d15436b fix: incorrect tree walker filter in hot reloading (closes #1355) (#1368) 2023-07-17 08:44:32 -04:00
Jack DeVries
7f4741b3a3 doc: add previews to backup CodeSandbox (#1169) 2023-07-17 08:40:30 -04:00
Hans Baker
85644a7c1c Fix broken link to example code in testing book page (#1365) 2023-07-16 20:00:56 -04:00
Greg Johnston
f40ae6af30 fix: correctly show fallback for Transition on first load even if not hydrating (#1362) 2023-07-16 15:19:51 -04:00
Greg Johnston
708e1a5aab docs: wasm-pack instructions missing --debug for Tailwind examples 2023-07-16 12:28:20 -04:00
Joseph Cruz
55613c9a31 ci(check-examples): only run on source change (#1356)
* ci(check-examples): only run on source change

* ci(check-examples):  simulate source change

* ci(check-examples): fix expression

* ci(check-examples): simulate source change

* ci(check-examples): test change against files

* ci(check-examples): adjust expression

* ci(check-examples): remove quotes

* ci(check-examples): use from json

* ci(check-examples): set output value

* ci(check-examples): remove simulated change
2023-07-15 19:09:54 -04:00
Joseph Cruz
e6590c7d31 ci(ci): only run on source change (#1357)
* ci(ci): only run on source change

* ci(ci): simulate source change

* ci(ci): remove simulated source change
2023-07-15 19:09:33 -04:00
Greg Johnston
5af2f4e98d docs/warning: fix <ActionForm/> docs and add runtime warning for incorrect encodings (#1360) 2023-07-15 19:09:03 -04:00
Greg Johnston
8e68699435 feat: add support for adding CSP nonces (#1348) 2023-07-14 16:37:18 -04:00
Greg Johnston
77580401da fix: hydration-key conflicts between <ErrorBoundary/> children and fallback (#1354) 2023-07-14 14:37:54 -04:00
Joseph Cruz
7902e7edb7 ci: speed up verification (#1347)
* build: introduce ci task
* refactor(ci): rename cargo make task runner
* ci: add ci workflow
* ci: remove redundant workflows
2023-07-14 14:37:17 -04:00
Greg Johnston
4ad223277d fix: duplicated meta content during async rendering (#1352) 2023-07-14 13:14:19 -04:00
Greg Johnston
6f5da11c72 docs/warnings: don't warn when a resource resolves after its scope has been disposed (#1351) 2023-07-14 13:09:57 -04:00
Greg Johnston
3eed86fbf3 docs/warnings: improve ServerFnError when a server function is not found (#1350) 2023-07-14 12:43:08 -04:00
Greg Johnston
10d51a854a v0.4.3 2023-07-14 09:22:19 -04:00
CircuitSacul
6c60bad757 examples: use cfg_attr for conditional derives (#1349)
Revert "use cfg_attr for conditional derives"

This reverts commit b5c85e9ed8a84e5a49f119ae8436d78f2bee1fea.

Revert "Revert "use cfg_attr for conditional derives""

This reverts commit b538256cd69bc2321cdc9066441d71fc94ed80b9.
2023-07-14 09:20:55 -04:00
g-re-g
79f666b5da docs: don't run rust code snippets and update getting started (#1346)
* disable running leptos examples

* typo and small language changes to 02_getting_started
2023-07-14 07:10:59 -04:00
Greg Johnston
3ea3a40395 fix: server_fn rustls feature shouldn't pull in default-tls (#1343) 2023-07-13 19:41:55 -04:00
Greg Johnston
193aa79956 docs: how not to mutate the DOM during rendering (#1344) 2023-07-13 16:57:07 -04:00
Joseph Cruz
3481a6ee53 build: run tasks from workpace or member directory (#1339) 2023-07-13 16:46:51 -04:00
Greg Johnston
d1ef5fce9f fix: un-register <Suspense/> from resource reads when <Suspense/> is unmounted (#1342) 2023-07-13 14:42:05 -04:00
Greg Johnston
5d48911f01 fix: check LEPTOS_OUTPUT_NAME correctly at compile time (#1338) 2023-07-13 10:49:13 -04:00
Greg Johnston
8a90f97959 fix: routing logic to scroll to top was broken (#1335) 2023-07-13 06:43:49 -04:00
Greg Johnston
e9665b34e5 feat: add active_class prop on <A/> (#1323) 2023-07-12 16:21:07 -04:00
Greg Johnston
d4b1ceda90 fix: event delegation issue with <input name="host"> (#1332) 2023-07-12 16:20:11 -04:00
Greg Johnston
a0fae88f7d docs: clarify nightly in "Getting Started" (#1330) 2023-07-12 11:56:45 -04:00
Greg Johnston
03a8609680 fix: warning generated by new #[must_use] on views (#1329) 2023-07-12 10:00:05 -04:00
g-re-g
3e40f9cc66 chore: bump indexmap to 2 (#1325) 2023-07-11 15:24:21 -04:00
Greg Johnston
576bb078f7 fix: Actix server fn redirect() duplicate Location headers (#1326) 2023-07-11 13:57:44 -04:00
Filip Dutescu
3cdcc85c87 feat(config): implement common traits for Env (#1324)
In order to facilitate its usage in other structs, which might derive
various traits, such as `serde::Serialize` or `PartialEq`, implement
them for the `leptos_config::Env` enum.

Signed-off-by: Filip Dutescu <filip@hucksy.dev>
2023-07-11 09:37:42 -04:00
Greg Johnston
ec3a26dfbc fix: <ActionForm/> should set value even if redirected (#1321) 2023-07-11 09:37:13 -04:00
Filip Dutescu
c755dae6ee feat(leptos-config): kebab-case via serde's rename_all (#1308)
Currently, `leptos::LeptosOptions` are deserialized (and serialized)
to `snake_case`, since, by default, `serde` uses the name of the field
as-is. The options given via `.toml` files are given using `kebab-case`.
This behaviour leads to problems if you wish to use
`leptos::LeptosOptions` as the type of a field in your own config,
which uses the `kebab-case` syntax, as it will not provide any values
to that field.

These changes switch out the previous mechanism of manually replacing
the `-` character to the `_` character in order for serialization to
work. In its place, it uses `serde`'s `#[serde(rename_all = ...)]`
macro to handle the naming convention.

In case other naming conventions are used, a workaround would be to
define a user-owned mirror struct of `leptos::LeptosOptions`, which
would contain the required fields, deserialize it as desired and'
convert it to the latter via, for example, the `From<T>` trait.

Closes: #1295

Signed-off-by: Filip Dutescu <filip@hucksy.dev>
2023-07-11 09:36:55 -04:00
Greg Johnston
b67d51e019 docs: remove empty chapter from book 2023-07-10 07:38:12 -04:00
Joseph Cruz
7a34d6026f refactor(ci): improve the organization of cargo make tasks (#1320)
* refactor(cargo-make): extract node

* refactor(cargo-make): extract lint

* refactor(counters_stable): remove redundant tasks

* docs(cargo-make): remove descriptions

* refactor(counters_stable): streamline stages
2023-07-09 20:47:10 -04:00
Mahesh Bansod
548eac8e60 docs: typo & punctuation (#1316) 2023-07-09 20:35:04 -04:00
Mahesh Bansod
05ac8e861f docs: typo (#1315) 2023-07-09 20:34:36 -04:00
Martinez
7a4d475cca docs: update warnings to remove mention of csr as a default feature (#1313) 2023-07-09 20:32:25 -04:00
Greg Johnston
eea8e60518 docs: clarify WASM target (#1318) 2023-07-09 17:06:41 -04:00
Joseph Cruz
f6a272498d test(counters_stable/wasm): enter count (#1307) 2023-07-08 12:07:11 -04:00
Ari Seyhun
aef7c4ce8e perf: use lazy thread local for regex in router match_optionals (#1309) 2023-07-08 08:47:52 -04:00
Greg Johnston
b29eb8e032 fix: <ActionForm/> should check origin correctly before doing a full-page refresh (#1304) 2023-07-08 08:00:48 -04:00
Greg Johnston
da9183f4b5 docs: fix braces in <Show/> example (#1303) 2023-07-08 06:42:27 -04:00
Greg Johnston
ae3ddcb0e6 docs: must use View (#1302) 2023-07-08 06:42:02 -04:00
Greg Johnston
c6b8f0e8ed v0.4.2 2023-07-07 15:34:56 -04:00
g-re-g
bab9f40a81 fix: rework diff functionality for <For/> (#1296) 2023-07-07 15:32:26 -04:00
webmstk
c2cfdf3678 docs: fixed typo in parent-child doc (#1300) 2023-07-07 13:59:08 -04:00
Joseph Cruz
8967eadc02 test(counters_stable): add wasm testing (#1278)
* test(counters_stable/wasm): view counters > counts

* test(counters_stable/wasm): view counters > title

* test(counters_stable/wasm): add counter

* test(counters_stable/wasm): add 1k counters

* clear(counters_stable/wasm): clear counters

* test(counters_stable/wasm): increment counters

* test(counters_stable/wasm): decrement counter

* test(counters_stable/wasm): remove counter
2023-07-07 13:07:27 -04:00
Greg Johnston
4cc65f837f chore: add mdbook in flake (#1299)
* nix-flake: use follows for `rust-overlay` (..)

This removes the extra nixpkgs dependency by re-using the nixpkgs
already defined.

https://nixos.wiki/wiki/Flakes
https://web.archive.org/web/20230621091703/https://nixos.wiki/wiki/Flakes

> # The `follows` keyword in inputs is used for inheritance.
> # Here, `inputs.nixpkgs` of sops-nix is kept consistent with the `inputs.nixpkgs` of
> # the current flake, to avoid problems caused by different versions of nixpkgs.

* nix-flake: use nix overlays for rustc/cargo (..)

This allows the same nightly rust version to be used across the
flake (vs. strictly in the `devShell`).

* nix-flake: add `mdbook` to the development shell (..)

bumped `nixpkgs` to the latest unstable to pull in mdbook version `0.4.30`.

* nix-flake: expose all rust tools in dev environment (..)

The `oxalica / rust-overlay` docs expose all tools in the development
environment, so we should do the same:

https://github.com/oxalica/rust-overlay#use-in-devshell-for-nix-develop

---------

Co-authored-by: Jay Querie <jay@querie.cc>
2023-07-07 12:59:18 -04:00
Dessalines
22706e7371 docs: adding instructions to add a tailwind plugin to examples. (#1293) 2023-07-07 12:35:24 -04:00
webmstk
9f9302662c docs/examples: make error handling example more obvious for Chrome users (#1292) 2023-07-07 12:34:57 -04:00
Greg Johnston
6b90e1babd examples: add 404 support in Actix examples (closes #1031) (#1291) 2023-07-06 10:35:37 -04:00
sjud
7e540a8f49 feat: support Axum extractors with state other than () (#1275)
This requires state to be provided via context using a special handler, but allows for extractors that use this state, rather than only `()`, as previously.
2023-07-05 20:40:29 -04:00
Greg Johnston
f06ffd72aa fix: use once_cell::OnceCell rather than std::OnceCell (#1288) 2023-07-05 17:16:51 -04:00
Greg Johnston
83d3d7579c fix: issue with class hydration not removing classes correctly (closes #1286) (#1287) 2023-07-05 12:00:27 -04:00
Greg Johnston
39edb6eb45 fix: untracked read in <Redirect/> (#1280) 2023-07-04 11:52:13 -04:00
Greg Johnston
d81c1a929e fix: duplicate text nodes during <For/> hydration (closes #1279) (#1281) 2023-07-04 11:50:59 -04:00
Greg Johnston
f69c28df18 fix: improved diagnostics about non-reactive signal access (#1277) 2023-07-03 19:37:15 -04:00
525 changed files with 29633 additions and 13181 deletions

View File

@@ -9,38 +9,21 @@ on:
- main
jobs:
setup:
name: Get Examples
runs-on: ubuntu-latest
outputs:
matrix: ${{ steps.set-matrix.outputs.matrix }}
steps:
- name: Checkout
uses: actions/checkout@v3
get-leptos-changed:
uses: ./.github/workflows/get-leptos-changed.yml
- name: Install JQ Tool
uses: mbround18/install-jq@v1
get-examples-matrix:
uses: ./.github/workflows/get-examples-matrix.yml
- name: Set Matrix
id: set-matrix
run: |
examples=$(ls examples |
awk '{print "examples/" $0}' |
grep -v examples/README.md |
grep -v examples/Makefile.toml |
grep -v examples/cargo-make |
grep -v examples/gtk |
jq -R -s -c 'split("\n")[:-1]')
echo "Example Directories: $examples"
echo "matrix={\"directory\":$examples}" >> "$GITHUB_OUTPUT"
matrix-job:
test:
name: Check
needs: [setup]
needs: [get-leptos-changed, get-examples-matrix]
if: needs.get-leptos-changed.outputs.leptos_changed == 'true'
strategy:
matrix: ${{ fromJSON(needs.setup.outputs.matrix) }}
matrix: ${{ fromJSON(needs.get-examples-matrix.outputs.matrix) }}
fail-fast: false
uses: ./.github/workflows/run-example-task.yml
uses: ./.github/workflows/run-cargo-make-task.yml
with:
directory: ${{ matrix.directory }}
cargo_make_task: "check"
toolchain: nightly

View File

@@ -2,45 +2,25 @@ name: Check stable
on:
push:
branches: [main]
branches:
- main
pull_request:
branches: [main]
env:
CARGO_TERM_COLOR: always
CARGO_REGISTRIES_CRATES_IO_PROTOCOL: sparse
branches:
- main
jobs:
get-leptos-changed:
uses: ./.github/workflows/get-leptos-changed.yml
test:
name: Check examples ${{ matrix.os }} (using rustc ${{ matrix.rust }})
runs-on: ${{ matrix.os }}
name: Check
needs: [get-leptos-changed]
if: needs.get-leptos-changed.outputs.leptos_changed == 'true'
strategy:
matrix:
rust:
- stable
os:
- ubuntu-latest
steps:
- uses: actions/checkout@v3
- name: Setup Rust
uses: actions-rs/toolchain@v1
with:
toolchain: ${{ matrix.rust }}
override: true
components: rustfmt
- name: Add wasm32-unknown-unknown
run: rustup target add wasm32-unknown-unknown
- name: Setup cargo-make
uses: davidB/rust-cargo-make@v1
- name: Cargo generate-lockfile
run: cargo generate-lockfile
- uses: Swatinem/rust-cache@v2
- name: Run cargo check on all examples
run: cargo make --profile=github-actions check-stable
directory: [examples/counters_stable, examples/counter_without_macros]
uses: ./.github/workflows/run-cargo-make-task.yml
with:
directory: ${{ matrix.directory }}
cargo_make_task: "check"
toolchain: stable

View File

@@ -1,46 +0,0 @@
name: Check
on:
push:
branches: [main]
pull_request:
branches: [main]
env:
CARGO_TERM_COLOR: always
CARGO_REGISTRIES_CRATES_IO_PROTOCOL: sparse
jobs:
test:
name: Run `cargo check` ${{ matrix.os }} (using rustc ${{ matrix.rust }})
runs-on: ${{ matrix.os }}
strategy:
matrix:
rust:
- nightly
os:
- ubuntu-latest
steps:
- uses: actions/checkout@v3
- name: Setup Rust
uses: actions-rs/toolchain@v1
with:
toolchain: ${{ matrix.rust }}
override: true
components: rustfmt
- name: Add wasm32-unknown-unknown
run: rustup target add wasm32-unknown-unknown
- name: Setup cargo-make
uses: davidB/rust-cargo-make@v1
- name: Cargo generate-lockfile
run: cargo generate-lockfile
- uses: Swatinem/rust-cache@v2
- name: Run cargo check on all libraries
run: cargo make --profile=github-actions check

View File

@@ -0,0 +1,32 @@
name: CI Changed Examples
on:
push:
branches:
- main
pull_request:
branches:
- main
jobs:
get-example-changed:
uses: ./.github/workflows/get-example-changed.yml
get-matrix:
needs: [get-example-changed]
uses: ./.github/workflows/get-changed-examples-matrix.yml
with:
example_changed: ${{ fromJSON(needs.get-example-changed.outputs.example_changed) }}
test:
name: CI
needs: [get-example-changed, get-matrix]
if: needs.get-example-changed.outputs.example_changed == 'true'
strategy:
matrix: ${{ fromJSON(needs.get-matrix.outputs.matrix) }}
fail-fast: false
uses: ./.github/workflows/run-cargo-make-task.yml
with:
directory: ${{ matrix.directory }}
cargo_make_task: "ci"
toolchain: nightly

44
.github/workflows/ci.yml vendored Normal file
View File

@@ -0,0 +1,44 @@
name: CI
on:
push:
branches:
- main
pull_request:
branches:
- main
jobs:
get-leptos-changed:
uses: ./.github/workflows/get-leptos-changed.yml
test:
name: CI
needs: [get-leptos-changed]
if: needs.get-leptos-changed.outputs.leptos_changed == 'true'
strategy:
matrix:
directory:
[
integrations/actix,
integrations/axum,
integrations/viz,
integrations/utils,
leptos,
leptos_config,
leptos_dom,
leptos_hot_reload,
leptos_macro,
leptos_reactive,
leptos_server,
meta,
router,
server_fn,
server_fn/server_fn_macro_default,
server_fn_macro,
]
uses: ./.github/workflows/run-cargo-make-task.yml
with:
directory: ${{ matrix.directory }}
cargo_make_task: "ci"
toolchain: nightly

View File

@@ -1,34 +0,0 @@
name: Format
on:
push:
branches: [main]
pull_request:
branches: [main]
env:
CARGO_TERM_COLOR: always
jobs:
test:
name: Run rustfmt
runs-on: ${{ matrix.os }}
strategy:
matrix:
rust:
- nightly
os:
- ubuntu-latest
steps:
- uses: actions/checkout@v3
- name: Setup Rust
uses: actions-rs/toolchain@v1
with:
toolchain: ${{ matrix.rust }}
override: true
components: rustfmt
- name: Run Rustfmt
run: cargo fmt -- --check

View File

@@ -1,16 +1,20 @@
name: Verify Changed Examples
name: Changed Examples Matrix Call
on:
push:
branches:
- main
pull_request:
branches:
- main
workflow_call:
inputs:
example_changed:
description: "Example Changed"
required: true
type: boolean
outputs:
matrix:
description: "Matrix"
value: ${{ jobs.get-example-changed.outputs.matrix }}
jobs:
setup:
name: Get Changes
get-example-changed:
name: Get Changed Example Matrix
runs-on: ubuntu-latest
outputs:
matrix: ${{ steps.set-matrix.outputs.matrix }}
@@ -20,16 +24,6 @@ jobs:
with:
fetch-depth: 0
- name: Get all example files that changed
id: changed-files
uses: tj-actions/changed-files@v36
with:
files: |
examples
- name: List all example files that changed
run: echo '${{ steps.changed-files.outputs.all_changed_files }}'
- name: Get example project directories that changed
id: changed-dirs
uses: tj-actions/changed-files@v36
@@ -51,21 +45,10 @@ jobs:
- name: Set Matrix
id: set-matrix
run: |
if [ ${{ steps.changed-files.outputs.any_changed }} == 'true' ]; then
if [ ${{ inputs.example_changed }} == 'true' ]; then
# Create matrix with changed directories
echo "matrix={\"directory\":${{ steps.changed-dirs.outputs.all_changed_files }}}" >> "$GITHUB_OUTPUT"
else
# Create matrix with one item to prevent an empty vector error
echo "matrix={\"directory\":[\"INTERNAL\"]}" >> "$GITHUB_OUTPUT"
echo "matrix={\"directory\":[\"NO_CHANGE\"]}" >> "$GITHUB_OUTPUT"
fi
matrix-job:
name: Verify
needs: [setup]
strategy:
matrix: ${{ fromJSON(needs.setup.outputs.matrix) }}
fail-fast: false
uses: ./.github/workflows/run-example-task.yml
with:
directory: ${{ matrix.directory }}
cargo_make_task: "verify-flow"

View File

@@ -0,0 +1,39 @@
name: Examples Changed Call
on:
workflow_call:
outputs:
example_changed:
description: "Example Changed"
value: ${{ jobs.get-example-changed.outputs.example_changed }}
jobs:
get-example-changed:
name: Get Example Changed
runs-on: ubuntu-latest
outputs:
example_changed: ${{ steps.set-example-changed.outputs.example_changed }}
steps:
- name: Checkout
uses: actions/checkout@v3
with:
fetch-depth: 0
- name: Get example files that changed
id: changed-files
uses: tj-actions/changed-files@v36
with:
files: |
examples
!examples/cargo-make
!examples/gtk
!examples/Makefile.toml
!examples/README.md
- name: List example files that changed
run: echo '${{ steps.changed-files.outputs.all_changed_files }}'
- name: Set example_changed
id: set-example-changed
run: |
echo "example_changed=${{ steps.changed-files.outputs.any_changed }}" >> "$GITHUB_OUTPUT"

View File

@@ -0,0 +1,40 @@
name: Get Examples Matrix Call
on:
workflow_call:
outputs:
matrix:
description: "Matrix"
value: ${{ jobs.create.outputs.matrix }}
jobs:
create:
name: Create Examples Matrix
runs-on: ubuntu-latest
outputs:
matrix: ${{ steps.set-matrix.outputs.matrix }}
steps:
- name: Checkout
uses: actions/checkout@v3
- name: Install JQ Tool
uses: mbround18/install-jq@v1
- name: Set Matrix
id: set-matrix
run: |
examples=$(ls examples |
awk '{print "examples/" $0}' |
grep -v examples/README.md |
grep -v examples/Makefile.toml |
grep -v examples/cargo-make |
grep -v examples/gtk |
jq -R -s -c 'split("\n")[:-1]')
echo "Example Directories: $examples"
echo "matrix={\"directory\":$examples}" >> "$GITHUB_OUTPUT"
- name: Print Location Info
run: |
echo "Workspace: ${{ github.workspace }}"
pwd
ls | sort -u

View File

@@ -0,0 +1,44 @@
name: Get Leptos Changed Call
on:
workflow_call:
outputs:
leptos_changed:
description: "Leptos Changed"
value: ${{ jobs.create.outputs.leptos_changed }}
jobs:
create:
name: Detect Source Change
runs-on: ubuntu-latest
outputs:
leptos_changed: ${{ steps.set-source-changed.outputs.leptos_changed }}
steps:
- name: Checkout
uses: actions/checkout@v3
- name: Get source files that changed
id: changed-source
uses: tj-actions/changed-files@v36
with:
files: |
integrations
leptos
leptos_config
leptos_dom
leptos_hot_reload
leptos_macro
leptos_reactive
leptos_server
meta
router
server_fn
server_fn_macro
- name: List source files that changed
run: echo '${{ steps.changed-source.outputs.all_changed_files }}'
- name: Set leptos_changed
id: set-source-changed
run: |
echo "leptos_changed=${{ steps.changed-source.outputs.any_changed }}" >> "$GITHUB_OUTPUT"

View File

@@ -1,9 +1,8 @@
name: Deploy book
on:
push:
paths: ['docs/book/**']
branches:
- main
tags:
- '*-?v[0-9]+*'
jobs:
deploy:
@@ -34,4 +33,4 @@ jobs:
mv ../book/* .
git add .
git commit -m "Deploy book $GITHUB_SHA to gh-pages"
git push --force --set-upstream origin gh-pages
git push --force --set-upstream origin gh-pages

View File

@@ -1,4 +1,4 @@
name: Run Example Task
name: Run Task
on:
workflow_call:
@@ -9,34 +9,27 @@ on:
cargo_make_task:
required: true
type: string
toolchain:
required: true
type: string
env:
CARGO_TERM_COLOR: always
CARGO_REGISTRIES_CRATES_IO_PROTOCOL: sparse
jobs:
test:
name: Run ${{ matrix.os }} (using rustc ${{ matrix.rust }})
runs-on: ${{ matrix.os }}
strategy:
matrix:
rust:
- nightly
os:
- ubuntu-latest
name: Run ${{ inputs.cargo_make_task }} (${{ inputs.toolchain }})
runs-on: ubuntu-latest
steps:
# Setup environment
- name: Install playwright browser dependencies
run: |
sudo apt-get update
sudo apt-get install libegl1 libvpx7 libevent-2.1-7 libopus0 libopengl0 libwoff1 libharfbuzz-icu0 libgstreamer-plugins-base1.0-0 libgstreamer-gl1.0-0 libhyphen0 libmanette-0.2-0 libgles2 gstreamer1.0-libav
- uses: actions/checkout@v3
- uses: actions/checkout@v4
- name: Setup Rust
uses: actions-rs/toolchain@v1
with:
toolchain: ${{ matrix.rust }}
toolchain: ${{ inputs.toolchain }}
override: true
components: rustfmt
@@ -84,12 +77,38 @@ jobs:
restore-keys: |
${{ runner.os }}-pnpm-store-
# Verify project
- name: Maybe install chromedriver
run: |
project_makefile=${{inputs.directory}}/Makefile.toml
webdriver_count=$(cat $project_makefile | grep "cargo-make/webdriver.toml" | wc -l)
if [ $webdriver_count -eq 1 ]; then
if ! command -v chromedriver &>/dev/null; then
echo chromedriver required
sudo apt-get update
sudo apt-get install chromium-chromedriver
else
echo chromedriver is already installed
fi
else
echo chromedriver is not required
fi
- name: Maybe install playwright browser dependencies
run: |
for pw_path in $(find ${{inputs.directory}} -name playwright.config.ts)
do
pw_dir=$(dirname $pw_path)
if [ ! -v $pw_dir ]; then
echo "Playwright required in $pw_dir"
cd $pw_dir
pnpm dlx playwright install --with-deps
else
echo Playwright is not required
fi
done
# Run Cargo Make Task
- name: ${{ inputs.cargo_make_task }}
run: |
if [ "${{ inputs.directory }}" = "INTERNAL" ]; then
echo No verification required
else
cd ${{ inputs.directory }}
cargo make --profile=github-actions ${{ inputs.cargo_make_task }}
fi
cd ${{ inputs.directory }}
cargo make --profile=github-actions ${{ inputs.cargo_make_task }}

View File

@@ -1,46 +0,0 @@
name: Test
on:
push:
branches: [main]
pull_request:
branches: [main]
env:
CARGO_TERM_COLOR: always
CARGO_REGISTRIES_CRATES_IO_PROTOCOL: sparse
jobs:
test:
name: Run tests ${{ matrix.os }} (using rustc ${{ matrix.rust }})
runs-on: ${{ matrix.os }}
strategy:
matrix:
rust:
- nightly
os:
- ubuntu-latest
steps:
- uses: actions/checkout@v3
- name: Setup Rust
uses: actions-rs/toolchain@v1
with:
toolchain: ${{ matrix.rust }}
override: true
components: rustfmt
- name: Add wasm32-unknown-unknown
run: rustup target add wasm32-unknown-unknown
- name: Setup cargo-make
uses: davidB/rust-cargo-make@v1
- name: Cargo generate-lockfile
run: cargo generate-lockfile
- uses: Swatinem/rust-cache@v2
- name: Run tests with all features
run: cargo make --profile=github-actions test

View File

@@ -1,4 +1,4 @@
name: Verify All Examples
name: CI Examples
on:
workflow_dispatch:
@@ -10,38 +10,17 @@ on:
- cron: "0 8 * * *"
jobs:
setup:
name: Get Examples
runs-on: ubuntu-latest
outputs:
matrix: ${{ steps.set-matrix.outputs.matrix }}
steps:
- name: Checkout
uses: actions/checkout@v3
get-examples-matrix:
uses: ./.github/workflows/get-examples-matrix.yml
- name: Install JQ Tool
uses: mbround18/install-jq@v1
- name: Set Matrix
id: set-matrix
run: |
examples=$(ls examples |
awk '{print "examples/" $0}' |
grep -v examples/README.md |
grep -v examples/Makefile.toml |
grep -v examples/cargo-make |
grep -v examples/gtk |
jq -R -s -c 'split("\n")[:-1]')
echo "Example Directories: $examples"
echo "matrix={\"directory\":$examples}" >> "$GITHUB_OUTPUT"
matrix-job:
name: Verify
needs: [setup]
test:
name: CI
needs: [get-examples-matrix]
strategy:
matrix: ${{ fromJSON(needs.setup.outputs.matrix) }}
matrix: ${{ fromJSON(needs.get-examples-matrix.outputs.matrix) }}
fail-fast: false
uses: ./.github/workflows/run-example-task.yml
uses: ./.github/workflows/run-cargo-make-task.yml
with:
directory: ${{ matrix.directory }}
cargo_make_task: "verify-flow"
cargo_make_task: "ci"
toolchain: nightly

2
.gitignore vendored
View File

@@ -9,3 +9,5 @@ Cargo.lock
.idea
.direnv
.envrc
.vscode

View File

@@ -220,8 +220,8 @@ for reference: they include large amounts of manual SSR route handling, etc.
## `cargo-leptos` helpers
`leptos_config` and `leptos_hot_reload` exist to support two different features
of `cargo-leptos`, namely its configuration and its view-patching/hot-
reloading features.
of `cargo-leptos`, namely its configuration and its view-patching/hot-reloading
features.
Its important to say that the main feature `cargo-leptos` remains its ability
to conveniently tie together different build tooling, compiling your app to

View File

@@ -70,6 +70,25 @@ are a few guidelines that will make it a better experience for everyone:
`cargo-make` and using `cargo make check && cargo make test && cargo make
check-examples`.
## Before Submitting a PR
We have a fairly extensive CI setup that runs both lints (like `rustfmt` and `clippy`)
and tests on PRs. You can run most of these locally if you have `cargo-make` installed.
If you added an example, make sure to add it to the list in `examples/Makefile.toml`.
From the root directory of the repo, run
- `cargo +nightly fmt`
- `cargo +nightly make check`
- `cargo +nightly make test`
- `cargo +nightly make check-examples`
- `cargo +nightly make --profile=github-actions ci`
If you modified an example:
- `cd examples/your_example`
- `cargo +nightly fmt -- --config-path ../..`
- `cargo +nightly make --profile=github-actions verify-flow`
## Architecture
See [ARCHITECTURE.md](./ARCHITECTURE.md).

View File

@@ -26,22 +26,22 @@ members = [
exclude = ["benchmarks", "examples"]
[workspace.package]
version = "0.4.0"
version = "0.5.0-beta2"
[workspace.dependencies]
leptos = { path = "./leptos", version = "0.4.0" }
leptos_dom = { path = "./leptos_dom", version = "0.4.0" }
leptos_hot_reload = { path = "./leptos_hot_reload", version = "0.4.0" }
leptos_macro = { path = "./leptos_macro", version = "0.4.0" }
leptos_reactive = { path = "./leptos_reactive", version = "0.4.0" }
leptos_server = { path = "./leptos_server", version = "0.4.0" }
server_fn = { path = "./server_fn", version = "0.4.0" }
server_fn_macro = { path = "./server_fn_macro", version = "0.4.0" }
server_fn_macro_default = { path = "./server_fn/server_fn_macro_default", version = "0.4.0" }
leptos_config = { path = "./leptos_config", version = "0.4.0" }
leptos_router = { path = "./router", version = "0.4.0" }
leptos_meta = { path = "./meta", version = "0.4.0" }
leptos_integration_utils = { path = "./integrations/utils", version = "0.4.0" }
leptos = { path = "./leptos", version = "0.5.0-beta2" }
leptos_dom = { path = "./leptos_dom", version = "0.5.0-beta2" }
leptos_hot_reload = { path = "./leptos_hot_reload", version = "0.5.0-beta2" }
leptos_macro = { path = "./leptos_macro", version = "0.5.0-beta2" }
leptos_reactive = { path = "./leptos_reactive", version = "0.5.0-beta2" }
leptos_server = { path = "./leptos_server", version = "0.5.0-beta2" }
server_fn = { path = "./server_fn", version = "0.5.0-beta2" }
server_fn_macro = { path = "./server_fn_macro", version = "0.5.0-beta2" }
server_fn_macro_default = { path = "./server_fn/server_fn_macro_default", version = "0.5.0-beta2" }
leptos_config = { path = "./leptos_config", version = "0.5.0-beta2" }
leptos_router = { path = "./router", version = "0.5.0-beta2" }
leptos_meta = { path = "./meta", version = "0.5.0-beta2" }
leptos_integration_utils = { path = "./integrations/utils", version = "0.5.0-beta2" }
[profile.release]
codegen-units = 1

View File

@@ -3,122 +3,37 @@
# cargo install --force cargo-make
############
[config]
# make tasks run at the workspace root
default_to_workspace = false
[tasks.check]
clear = true
dependencies = [
"check-all",
"check-wasm",
"check-all-release",
"check-wasm-release",
]
[tasks.check-all]
command = "cargo"
args = ["+nightly", "check-all-features"]
install_crate = "cargo-all-features"
[tasks.check-wasm]
clear = true
dependencies = [{ name = "check-wasm", path = "leptos" }]
[tasks.check-all-release]
command = "cargo"
args = ["+nightly", "check-all-features"]
install_crate = "cargo-all-features"
[tasks.check-wasm-release]
clear = true
dependencies = [{ name = "check-wasm-release", path = "leptos" }]
[tasks.check-examples]
clear = true
dependencies = [
{ name = "check", path = "examples/counter" },
{ name = "check", path = "examples/counter_isomorphic" },
{ name = "check", path = "examples/counters" },
{ name = "check", path = "examples/error_boundary" },
{ name = "check", path = "examples/errors_axum" },
{ name = "check", path = "examples/fetch" },
{ name = "check", path = "examples/hackernews" },
{ name = "check", path = "examples/hackernews_axum" },
{ name = "check", path = "examples/js-framework-benchmark" },
{ name = "check", path = "examples/leptos-tailwind-axum" },
{ name = "check", path = "examples/login_with_token_csr_only" },
{ name = "check", path = "examples/parent_child" },
{ name = "check", path = "examples/router" },
{ name = "check", path = "examples/session_auth_axum" },
{ name = "check", path = "examples/slots" },
{ name = "check", path = "examples/ssr_modes" },
{ name = "check", path = "examples/ssr_modes_axum" },
{ name = "check", path = "examples/tailwind" },
{ name = "check", path = "examples/tailwind_csr_trunk" },
{ name = "check", path = "examples/timer" },
{ name = "check", path = "examples/todo_app_sqlite" },
{ name = "check", path = "examples/todo_app_sqlite_axum" },
{ name = "check", path = "examples/todo_app_sqlite_viz" },
{ name = "check", path = "examples/todomvc" },
]
[env]
CARGO_MAKE_EXTEND_WORKSPACE_MAKEFILE = true
[tasks.check-stable]
workspace = false
clear = true
dependencies = [
{ name = "check", path = "examples/counter_without_macros" },
{ name = "check", path = "examples/counters_stable" },
]
[tasks.test]
clear = true
dependencies = [
"test-all",
"test-leptos_macro-example",
"doc-leptos_macro-example",
]
[tasks.test-all]
command = "cargo"
args = ["+nightly", "test-all-features"]
install_crate = "cargo-all-features"
[tasks.test-leptos_macro-example]
description = "Tests the leptos_macro/example to check if macro handles doc comments correctly"
command = "cargo"
args = ["+nightly", "test", "--doc"]
cwd = "leptos_macro/example"
install_crate = false
[tasks.doc-leptos_macro-example]
description = "Docs the leptos_macro/example to check if macro handles doc comments correctly"
command = "cargo"
args = ["+nightly", "doc"]
cwd = "leptos_macro/example"
install_crate = false
[tasks.test-examples]
description = "Run all unit and web tests for examples"
[tasks.ci-examples]
workspace = false
cwd = "examples"
command = "cargo"
args = ["make", "test-unit-and-web"]
args = ["make", "ci-clean"]
[tasks.verify-examples]
description = "Run all quality checks and tests for examples"
env = { CLEAN_AFTER_VERIFY = "true" }
[tasks.check-examples]
workspace = false
cwd = "examples"
command = "cargo"
args = ["make", "verify-flow"]
args = ["make", "check-clean"]
[tasks.build-examples]
workspace = false
cwd = "examples"
command = "cargo"
args = ["make", "build-clean"]
[tasks.clean-examples]
description = "Clean all example projects"
workspace = false
cwd = "examples"
command = "cargo"
args = ["make", "clean-all"]
[env]
RUSTFLAGS = ""
LEPTOS_OUTPUT_NAME = "ci" # allows examples to check/build without cargo-leptos
[env.github-actions]
RUSTFLAGS = "-D warnings"
args = ["make", "clean"]

View File

@@ -16,9 +16,9 @@
use leptos::*;
#[component]
pub fn SimpleCounter(cx: Scope, initial_value: i32) -> impl IntoView {
pub fn SimpleCounter(initial_value: i32) -> impl IntoView {
// create a reactive signal with the initial value
let (value, set_value) = create_signal(cx, initial_value);
let (value, set_value) = create_signal(initial_value);
// create event handlers for our buttons
// note that `value` and `set_value` are `Copy`, so it's super easy to move them into closures
@@ -27,23 +27,29 @@ pub fn SimpleCounter(cx: Scope, initial_value: i32) -> impl IntoView {
let increment = move |_| set_value.update(|value| *value += 1);
// create user interfaces with the declarative `view!` macro
view! { cx,
view! {
<div>
<button on:click=clear>"Clear"</button>
<button on:click=decrement>"-1"</button>
<button on:click=clear>Clear</button>
<button on:click=decrement>-1</button>
// text nodes can be quoted or unquoted
<span>"Value: " {value} "!"</span>
<button on:click=increment>"+1"</button>
<button on:click=increment>+1</button>
</div>
}
}
// Easy to use with Trunk (trunkrs.dev) or with a simple wasm-bindgen setup
pub fn main() {
mount_to_body(|cx| view! { cx, <SimpleCounter initial_value=3 /> })
mount_to_body(|| view! {
<SimpleCounter initial_value=3 />
})
}
```
### Important Note
This example, and the entire `main` branch, now reflect the upcoming `0.5.0` release. You can use `0.5.0` with the `0.5.0-beta` release on crates.io or by a git dependency on the `main` branch of this repo. [Click here for the 0.4.9 `README`](https://crates.io/crates/leptos).
## About the Framework
Leptos is a full-stack, isomorphic Rust web framework leveraging fine-grained reactivity to build declarative user interfaces.
@@ -88,8 +94,6 @@ targets = ["wasm32-unknown-unknown"]
The `nightly` feature enables the function call syntax for accessing and setting signals, as opposed to `.get()` and `.set()`. This leads to a consistent mental model in which accessing a reactive value of any kind (a signal, memo, or derived signal) is always represented as a function call. This is only possible with nightly Rust and the `nightly` feature.
> Note: The `nightly` feature is present on the main branch version right now, but not in 0.3.x. For 0.3.x, nightly is the default and `stable` has a special feature.
## `cargo-leptos`
[`cargo-leptos`](https://github.com/leptos-rs/cargo-leptos) is a build tool that's designed to make it easy to build apps that run on both the client and the server, with seamless integration. The best way to get started with a real Leptos project right now is to use `cargo-leptos` and our starter templates for [Actix](https://github.com/leptos-rs/start) or [Axum](https://github.com/leptos-rs/start-axum).
@@ -107,7 +111,7 @@ Open browser to [http://localhost:3000/](http://localhost:3000/).
### Whats up with the name?
_Leptos_ (λεπτός) is an ancient Greek word meaning “thin, light, refine, fine-grained.” To me, a classicist and not a dog owner, it evokes the lightweight reactive system that powers the framework. I've since learned the same word is at the root of the medical term “leptospirosis,” a blood infection that affects humans and animals... My bad. No dogs were harmed in the creation of this framework.
_Leptos_ (λεπτός) is an ancient Greek word meaning “thin, light, refined, fine-grained.” To me, a classicist and not a dog owner, it evokes the lightweight reactive system that powers the framework. I've since learned the same word is at the root of the medical term “leptospirosis,” a blood infection that affects humans and animals... My bad. No dogs were harmed in the creation of this framework.
### Is it production ready?
@@ -115,7 +119,7 @@ People usually mean one of three things by this question.
1. **Are the APIs stable?** i.e., will I have to rewrite my whole app from Leptos 0.1 to 0.2 to 0.3 to 0.4, or can I write it now and benefit from new features and updates as new versions come?
The APIs are basically settled. Were adding new features, but were very happy with where the type system and patterns have landed. I would not expect major breaking changes to your code to adapt to future releases. The sorts of breaking changes that we discuss are things like “Oh yeah, that function should probably take `cx` as its argument...” not major changes to the way you write your application.
The APIs are basically settled. Were adding new features, but were very happy with where the type system and patterns have landed. I would not expect major breaking changes to your code to adapt to future releases, in terms of architecture.
2. **Are there bugs?**
@@ -154,13 +158,13 @@ There are some practical differences that make a significant difference:
- **Templating:** Leptos uses a JSX-like template format (built on [syn-rsx](https://github.com/stoically/syn-rsx)) for its `view` macro. Sycamore offers the choice of its own templating DSL or a builder syntax.
- **Server integration:** Leptos provides primitives that encourage HTML streaming and allow for easy async integration and RPC calls, even without WASM enabled, making it easy to opt into integrations between your frontend and backend code without pushing you toward any particular metaframework patterns.
- **Read-write segregation:** Leptos, like Solid, encourages read-write segregation between signal getters and setters, so you end up accessing signals with tuples like `let (count, set_count) = create_signal(cx, 0);` _(If you prefer or if it's more convenient for your API, you can use [`create_rw_signal`](https://docs.rs/leptos/latest/leptos/fn.create_rw_signal.html) to give a unified read/write signal.)_
- **Read-write segregation:** Leptos, like Solid, encourages read-write segregation between signal getters and setters, so you end up accessing signals with tuples like `let (count, set_count) = create_signal(0);` _(If you prefer or if it's more convenient for your API, you can use [`create_rw_signal`](https://docs.rs/leptos/latest/leptos/fn.create_rw_signal.html) to give a unified read/write signal.)_
- **Signals are functions:** In Leptos, you can call a signal to access it rather than calling a specific method (so, `count()` instead of `count.get()`) This creates a more consistent mental model: accessing a reactive value is always a matter of calling a function. For example:
```rust
let (count, set_count) = create_signal(cx, 0); // a signal
let (count, set_count) = create_signal(0); // a signal
let double_count = move || count() * 2; // a derived signal
let memoized_count = create_memo(cx, move |_| count() * 3); // a memo
let memoized_count = create_memo(move |_| count() * 3); // a memo
// all are accessed by calling them
assert_eq!(count(), 0);
assert_eq!(double_count(), 0);

13
SECURITY.md Normal file
View File

@@ -0,0 +1,13 @@
# Security Policy
## Reporting a Vulnerability
To report a suspected security issue, please contact security@leptos.dev rather than opening
a public issue.
## Supported Versions
The most-recently-released version of the library is supported with security updates.
For example, if a security issue is discovered that affects 0.3.2 and all later releases,
a 0.4.x patch will be released but a new 0.3.x patch release will not be made. You should
plan to update to the latest version to receive any new features or bugfixes of any kind.

View File

@@ -7,15 +7,15 @@ fn leptos_deep_creation(b: &mut Bencher) {
let runtime = create_runtime();
b.iter(|| {
create_scope(runtime, |cx| {
let signal = create_rw_signal(cx, 0);
create_scope(runtime, || {
let signal = create_rw_signal(0);
let mut memos = Vec::<Memo<usize>>::new();
for _ in 0..1000usize {
let prev = memos.last().copied();
if let Some(prev) = prev {
memos.push(create_memo(cx, move |_| prev.get() + 1));
memos.push(create_memo(move |_| prev.get() + 1));
} else {
memos.push(create_memo(cx, move |_| signal.get() + 1));
memos.push(create_memo(move |_| signal.get() + 1));
}
}
})
@@ -31,14 +31,14 @@ fn leptos_deep_update(b: &mut Bencher) {
let runtime = create_runtime();
b.iter(|| {
create_scope(runtime, |cx| {
let signal = create_rw_signal(cx, 0);
create_scope(runtime, || {
let signal = create_rw_signal(0);
let mut memos = Vec::<Memo<usize>>::new();
for _ in 0..1000usize {
if let Some(prev) = memos.last().copied() {
memos.push(create_memo(cx, move |_| prev.get() + 1));
memos.push(create_memo(move |_| prev.get() + 1));
} else {
memos.push(create_memo(cx, move |_| signal.get() + 1));
memos.push(create_memo(move |_| signal.get() + 1));
}
}
signal.set(1);
@@ -56,12 +56,11 @@ fn leptos_narrowing_down(b: &mut Bencher) {
let runtime = create_runtime();
b.iter(|| {
create_scope(runtime, |cx| {
let sigs =
(0..1000).map(|n| create_signal(cx, n)).collect::<Vec<_>>();
create_scope(runtime, || {
let sigs = (0..1000).map(|n| create_signal(n)).collect::<Vec<_>>();
let reads = sigs.iter().map(|(r, _)| *r).collect::<Vec<_>>();
let writes = sigs.iter().map(|(_, w)| *w).collect::<Vec<_>>();
let memo = create_memo(cx, move |_| {
let memo = create_memo(move |_| {
reads.iter().map(|r| r.get()).sum::<i32>()
});
assert_eq!(memo(), 499500);
@@ -78,10 +77,10 @@ fn leptos_fanning_out(b: &mut Bencher) {
let runtime = create_runtime();
b.iter(|| {
create_scope(runtime, |cx| {
let sig = create_rw_signal(cx, 0);
create_scope(runtime, || {
let sig = create_rw_signal(0);
let memos = (0..1000)
.map(|_| create_memo(cx, move |_| sig.get()))
.map(|_| create_memo(move |_| sig.get()))
.collect::<Vec<_>>();
assert_eq!(memos.iter().map(|m| m.get()).sum::<i32>(), 0);
sig.set(1);
@@ -99,17 +98,16 @@ fn leptos_narrowing_update(b: &mut Bencher) {
let runtime = create_runtime();
b.iter(|| {
create_scope(runtime, |cx| {
create_scope(runtime, || {
let acc = Rc::new(Cell::new(0));
let sigs =
(0..1000).map(|n| create_signal(cx, n)).collect::<Vec<_>>();
let sigs = (0..1000).map(|n| create_signal(n)).collect::<Vec<_>>();
let reads = sigs.iter().map(|(r, _)| *r).collect::<Vec<_>>();
let writes = sigs.iter().map(|(_, w)| *w).collect::<Vec<_>>();
let memo = create_memo(cx, move |_| {
let memo = create_memo(move |_| {
reads.iter().map(|r| r.get()).sum::<i32>()
});
assert_eq!(memo(), 499500);
create_isomorphic_effect(cx, {
create_isomorphic_effect({
let acc = Rc::clone(&acc);
move |_| {
acc.set(memo());
@@ -141,9 +139,9 @@ fn leptos_scope_creation_and_disposal(b: &mut Bencher) {
.map(|_| {
create_scope(runtime, {
let acc = Rc::clone(&acc);
move |cx| {
let (r, w) = create_signal(cx, 0);
create_isomorphic_effect(cx, {
move || {
let (r, w) = create_signal(0);
create_isomorphic_effect({
move |_| {
acc.set(r());
}
@@ -163,7 +161,9 @@ fn leptos_scope_creation_and_disposal(b: &mut Bencher) {
#[bench]
fn rs_deep_update(b: &mut Bencher) {
use reactive_signals::{Scope, Signal, signal, runtimes::ClientRuntime, types::Func};
use reactive_signals::{
runtimes::ClientRuntime, signal, types::Func, Scope, Signal,
};
let sc = ClientRuntime::new_root_scope();
b.iter(|| {
@@ -184,7 +184,9 @@ fn rs_deep_update(b: &mut Bencher) {
#[bench]
fn rs_fanning_out(b: &mut Bencher) {
use reactive_signals::{Scope, Signal, signal, runtimes::ClientRuntime, types::Func};
use reactive_signals::{
runtimes::ClientRuntime, signal, types::Func, Scope, Signal,
};
let cx = ClientRuntime::new_root_scope();
b.iter(|| {
@@ -200,18 +202,17 @@ fn rs_fanning_out(b: &mut Bencher) {
#[bench]
fn rs_narrowing_update(b: &mut Bencher) {
use reactive_signals::{Scope, Signal, signal, runtimes::ClientRuntime, types::Func};
use reactive_signals::{
runtimes::ClientRuntime, signal, types::Func, Scope, Signal,
};
let cx = ClientRuntime::new_root_scope();
b.iter(|| {
let acc = Rc::new(Cell::new(0));
let sigs =
(0..1000).map(|n| signal!(cx, n)).collect::<Vec<_>>();
let sigs = (0..1000).map(|n| signal!(cx, n)).collect::<Vec<_>>();
let memo = signal!(cx, {
let sigs = sigs.clone();
move || {
sigs.iter().map(|r| r.get()).sum::<i32>()
}
move || sigs.iter().map(|r| r.get()).sum::<i32>()
});
assert_eq!(memo.get(), 499500);
signal!(cx, {

View File

@@ -7,7 +7,7 @@ fn leptos_ssr_bench(b: &mut Bencher) {
leptos_dom::HydrationCtx::reset_id();
_ = create_scope(create_runtime(), |cx| {
#[component]
fn Counter(cx: Scope, initial: i32) -> impl IntoView {
fn Counter(initial: i32) -> impl IntoView {
let (value, set_value) = create_signal(cx, initial);
view! {
cx,

View File

@@ -1,7 +1,7 @@
pub use leptos::*;
use miniserde::*;
use web_sys::HtmlInputElement;
use wasm_bindgen::JsCast;
use web_sys::HtmlInputElement;
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct Todos(pub Vec<Todo>);
@@ -9,13 +9,13 @@ pub struct Todos(pub Vec<Todo>);
const STORAGE_KEY: &str = "todos-leptos";
impl Todos {
pub fn new(cx: Scope) -> Self {
pub fn new() -> Self {
Self(vec![])
}
pub fn new_with_1000(cx: Scope) -> Self {
pub fn new_with_1000() -> Self {
let todos = (0..1000)
.map(|id| Todo::new(cx, id, format!("Todo #{id}")))
.map(|id| Todo::new(id, format!("Todo #{id}")))
.collect();
Self(todos)
}
@@ -72,13 +72,17 @@ pub struct Todo {
}
impl Todo {
pub fn new(cx: Scope, id: usize, title: String) -> Self {
Self::new_with_completed(cx, id, title, false)
pub fn new(id: usize, title: String) -> Self {
Self::new_with_completed(id, title, false)
}
pub fn new_with_completed(cx: Scope, id: usize, title: String, completed: bool) -> Self {
let (title, set_title) = create_signal(cx, title);
let (completed, set_completed) = create_signal(cx, completed);
pub fn new_with_completed(
id: usize,
title: String,
completed: bool,
) -> Self {
let (title, set_title) = create_signal(title);
let (completed, set_completed) = create_signal(completed);
Self {
id,
title,
@@ -98,7 +102,7 @@ const ESCAPE_KEY: u32 = 27;
const ENTER_KEY: u32 = 13;
#[component]
pub fn TodoMVC(cx: Scope, todos: Todos) -> impl IntoView {
pub fn TodoMVC(todos: Todos) -> impl IntoView {
let mut next_id = todos
.0
.iter()
@@ -107,10 +111,10 @@ pub fn TodoMVC(cx: Scope, todos: Todos) -> impl IntoView {
.map(|last| last + 1)
.unwrap_or(0);
let (todos, set_todos) = create_signal(cx, todos);
provide_context(cx, set_todos);
let (todos, set_todos) = create_signal(todos);
provide_context(set_todos);
let (mode, set_mode) = create_signal(cx, Mode::All);
let (mode, set_mode) = create_signal(Mode::All);
let add_todo = move |ev: web_sys::KeyboardEvent| {
let target = event_target::<HtmlInputElement>(&ev);
@@ -120,7 +124,7 @@ pub fn TodoMVC(cx: Scope, todos: Todos) -> impl IntoView {
let title = event_target_value(&ev);
let title = title.trim();
if !title.is_empty() {
let new = Todo::new(cx, next_id, title.to_string());
let new = Todo::new(next_id, title.to_string());
set_todos.update(|t| t.add(new));
next_id += 1;
target.set_value("");
@@ -128,7 +132,7 @@ pub fn TodoMVC(cx: Scope, todos: Todos) -> impl IntoView {
}
};
let filtered_todos = create_memo::<Vec<Todo>>(cx, move |_| {
let filtered_todos = create_memo::<Vec<Todo>>(move |_| {
todos.with(|todos| match mode.get() {
Mode::All => todos.0.to_vec(),
Mode::Active => todos
@@ -148,7 +152,7 @@ pub fn TodoMVC(cx: Scope, todos: Todos) -> impl IntoView {
// effect to serialize to JSON
// this does reactive reads, so it will automatically serialize on any relevant change
create_effect(cx, move |_| {
create_effect(move |_| {
if let Ok(Some(storage)) = window().local_storage() {
let objs = todos
.get()
@@ -163,7 +167,7 @@ pub fn TodoMVC(cx: Scope, todos: Todos) -> impl IntoView {
}
});
view! { cx,
view! {
<main>
<section class="todoapp">
<header class="header">
@@ -188,8 +192,8 @@ pub fn TodoMVC(cx: Scope, todos: Todos) -> impl IntoView {
<For
each=filtered_todos
key=|todo| todo.id
view=move |cx, todo: Todo| {
view! { cx, <Todo todo=todo.clone()/> }
view=move |todo: Todo| {
view! { <Todo todo=todo.clone()/> }
}
/>
</ul>
@@ -236,14 +240,14 @@ pub fn TodoMVC(cx: Scope, todos: Todos) -> impl IntoView {
<p>"Part of " <a href="http://todomvc.com">"TodoMVC"</a></p>
</footer>
</main>
}.into_view(cx)
}.into_view()
}
#[component]
pub fn Todo(cx: Scope, todo: Todo) -> impl IntoView {
let (editing, set_editing) = create_signal(cx, false);
let set_todos = use_context::<WriteSignal<Todos>>(cx).unwrap();
//let input = NodeRef::new(cx);
pub fn Todo(todo: Todo) -> impl IntoView {
let (editing, set_editing) = create_signal(false);
let set_todos = use_context::<WriteSignal<Todos>>().unwrap();
//let input = NodeRef::new();
let save = move |value: &str| {
let value = value.trim();
@@ -255,7 +259,7 @@ pub fn Todo(cx: Scope, todo: Todo) -> impl IntoView {
set_editing(false);
};
view! { cx,
view! {
<li class="todo" class:editing=editing class:completed=move || (todo.completed)()>
<div class="view">
<input class="toggle" type="checkbox" prop:checked=move || (todo.completed)()/>
@@ -268,7 +272,7 @@ pub fn Todo(cx: Scope, todo: Todo) -> impl IntoView {
{move || {
editing()
.then(|| {
view! { cx,
view! {
<input
class="edit"
class:hidden=move || !(editing)()
@@ -319,8 +323,8 @@ pub struct TodoSerialized {
}
impl TodoSerialized {
pub fn into_todo(self, cx: Scope) -> Todo {
Todo::new_with_completed(cx, self.id, self.title, self.completed)
pub fn into_todo(self, ) -> Todo {
Todo::new_with_completed(self.id, self.title, self.completed)
}
}

View File

@@ -12,8 +12,8 @@ fn leptos_todomvc_ssr(b: &mut Bencher) {
b.iter(|| {
use crate::todomvc::leptos::*;
let html = ::leptos::ssr::render_to_string(|cx| {
view! { cx, <TodoMVC todos=Todos::new(cx)/> }
let html = ::leptos::ssr::render_to_string(|| {
view! { <TodoMVC todos=Todos::new()/> }
});
assert!(html.len() > 1);
});

7
cargo-make/check.toml Normal file
View File

@@ -0,0 +1,7 @@
[tasks.check]
alias = "check-all"
[tasks.check-all]
command = "cargo"
args = ["+nightly", "check-all-features"]
install_crate = "cargo-all-features"

11
cargo-make/lint.toml Normal file
View File

@@ -0,0 +1,11 @@
[tasks.lint]
dependencies = ["check-format-flow", "clippy-each-feature"]
[tasks.check-format]
env = { LEPTOS_PROJECT_DIRECTORY = "../" }
args = ["fmt", "--", "--check", "--config-path", "${LEPTOS_PROJECT_DIRECTORY}"]
[tasks.clippy-each-feature]
dependencies = ["install-clippy"]
command = "cargo"
args = ["hack", "clippy", "--all", "--each-feature", "--no-dev-deps"]

15
cargo-make/main.toml Normal file
View File

@@ -0,0 +1,15 @@
extend = [
{ path = "./check.toml" },
{ path = "./lint.toml" },
{ path = "./test.toml" },
]
[env]
RUSTFLAGS = ""
LEPTOS_OUTPUT_NAME = "ci" # allows examples to check/build without cargo-leptos
[env.github-actions]
RUSTFLAGS = "-D warnings"
[tasks.ci]
dependencies = ["lint", "test"]

7
cargo-make/test.toml Normal file
View File

@@ -0,0 +1,7 @@
[tasks.test]
alias = "test-all"
[tasks.test-all]
command = "cargo"
args = ["+nightly", "test-all-features"]
install_crate = "cargo-all-features"

View File

@@ -9,10 +9,10 @@ This document is intended as a running list of common issues, with example code
**Issue**: Sometimes you want to update a reactive signal in a way that depends on another signal.
```rust
let (a, set_a) = create_signal(cx, 0);
let (b, set_b) = create_signal(cx, false);
let (a, set_a) = create_signal(0);
let (b, set_b) = create_signal(false);
create_effect(cx, move |_| {
create_effect(move |_| {
if a() > 5 {
set_b(true);
}
@@ -24,7 +24,7 @@ This creates an inefficient chain of updates, and can easily lead to infinite lo
**Solution**: Follow the rule, _What can be derived, should be derived._ In this case, this has the benefit of massively reducing the code size, too!
```rust
let (a, set_a) = create_signal(cx, 0);
let (a, set_a) = create_signal(0);
let b = move || a () > 5;
```
@@ -34,19 +34,19 @@ Sometimes you have nested signals: for example, hash-map that can change over ti
```rust
#[component]
pub fn App(cx: Scope) -> impl IntoView {
let resources = create_rw_signal(cx, HashMap::new());
pub fn App() -> impl IntoView {
let resources = create_rw_signal(HashMap::new());
let update = move |id: usize| {
resources.update(|resources| {
resources
.entry(id)
.or_insert_with(|| create_rw_signal(cx, 0))
.or_insert_with(|| create_rw_signal(0))
.update(|amount| *amount += 1)
})
};
view! { cx,
view! {
<div>
<pre>{move || format!("{:#?}", resources.get().into_iter().map(|(id, resource)| (id, resource.get())).collect::<Vec<_>>())}</pre>
<button on:click=move |_| update(1)>"+"</button>
@@ -55,17 +55,17 @@ pub fn App(cx: Scope) -> impl IntoView {
}
```
Clicking the button twice will cause a panic, because of the nested signal *read*. Calling the `update` function on `resources` immediately takes out a mutable borrow on `resources`, then updates the `resource` signal—which re-runs the effect that reads from the signals, which tries to immutably access `resources` and panics. It's the nested update here which causes a problem, because the inner update triggers and effect that tries to read both signals while the outer is still updating.
Clicking the button twice will cause a panic, because of the nested signal _read_. Calling the `update` function on `resources` immediately takes out a mutable borrow on `resources`, then updates the `resource` signal—which re-runs the effect that reads from the signals, which tries to immutably access `resources` and panics. It's the nested update here which causes a problem, because the inner update triggers and effect that tries to read both signals while the outer is still updating.
You can fix this fairly easily by using the [`Scope::batch()`](https://docs.rs/leptos/latest/leptos/struct.Scope.html#method.batch) method:
You can fix this fairly easily by using the [`batch()`](https://docs.rs/leptos/latest/leptos/fn.batch.html) method:
```rust
let update = move |id: usize| {
cx.batch(move || {
batch(move || {
resources.update(|resources| {
resources
.entry(id)
.or_insert_with(|| create_rw_signal(cx, 0))
.or_insert_with(|| create_rw_signal(0))
.update(|amount| *amount += 1)
})
});
@@ -83,11 +83,11 @@ Many DOM attributes can be updated either by setting an attribute on the DOM nod
This means that in practice, attributes like `value` or `checked` on an `<input/>` element only update the _default_ value for the `<input/>`. If you want to reactively update the value, you should use `prop:value` instead to set the `value` property.
```rust
let (a, set_a) = create_signal(cx, "Starting value".to_string());
let (a, set_a) = create_signal("Starting value".to_string());
let on_input = move |ev| set_a(event_target_value(&ev));
view! {
cx,
// ❌ reactivity doesn't work as expected: typing only updates the default
// of each input, so if you start typing in the second input, it won't
// update the first one
@@ -97,11 +97,11 @@ view! {
```
```rust
let (a, set_a) = create_signal(cx, "Starting value".to_string());
let (a, set_a) = create_signal("Starting value".to_string());
let on_input = move |ev| set_a(event_target_value(&ev));
view! {
cx,
// ✅ works as intended by setting the value *property*
<input prop:value=a on:input=on_input />
<input prop:value=a on:input=on_input />

2
docs/book/book.toml Normal file
View File

@@ -0,0 +1,2 @@
[output.html.playground]
runnable = false

View File

@@ -17,4 +17,4 @@ understand Leptos.
You can find more detailed docs for each part of the API at [Docs.rs](https://docs.rs/leptos/latest/leptos/).
**The guide is a work in progress.**
> The source code for the book is available [here](https://github.com/leptos-rs/leptos/tree/main/docs/book). PRs for typos or clarification are always welcome.

View File

@@ -14,24 +14,39 @@ If you dont already have it installed, you can install Trunk by running
cargo install trunk
```
Create a basic Rust binary project
Create a basic Rust project
```bash
cargo init leptos-tutorial
```
> We recommend using `nightly` Rust, as it enables [a few nice features](https://github.com/leptos-rs/leptos#nightly-note). To use `nightly` Rust with WebAssembly, you can run
`cd` into your new `leptos-tutorial` project and add `leptos` as a dependency
```bash
cargo add leptos --features=csr,nightly
```
Or you can leave off `nightly` if you're using stable Rust
```bash
cargo add leptos --features=csr
```
> Using `nightly` Rust, and the `nightly` feature in Leptos enables the function-call syntax for signal getters and setters that is used in most of this book.
>
> To use `nightly` Rust, you can run
>
> ```bash
> rustup toolchain install nightly
> rustup default nightly
> rustup target add wasm32-unknown-unknown
> ```
>
> If youd rather use stable Rust with Leptos, you can do that too. In the guide and examples, youll just use the [`ReadSignal::get()`](https://docs.rs/leptos/latest/leptos/struct.ReadSignal.html#impl-SignalGet%3CT%3E-for-ReadSignal%3CT%3E) and [`WriteSignal::set()`](https://docs.rs/leptos/latest/leptos/struct.WriteSignal.html#impl-SignalGet%3CT%3E-for-ReadSignal%3CT%3E) methods instead of calling signal getters and setters as functions.
`cd` into your new `leptos-tutorial` project and add `leptos` as a dependency
Make sure you've added the `wasm32-unknown-unknown` target so that Rust can compile your code to WebAssembly to run in the browser.
```bash
cargo add leptos --features=csr,nightly # or just csr if you're using stable Rust
rustup target add wasm32-unknown-unknown
```
Create a simple `index.html` in the root of the `leptos-tutorial` directory
@@ -50,7 +65,7 @@ And add a simple “Hello, world!” to your `main.rs`
use leptos::*;
fn main() {
mount_to_body(|cx| view! { cx, <p>"Hello, world!"</p> })
mount_to_body(|| view! { <p>"Hello, world!"</p> })
}
```

View File

@@ -1 +0,0 @@
# Responding to Changes with create_effect

View File

@@ -29,15 +29,15 @@ all its children and descendants using `provide_context`.
```rust
#[component]
fn App(cx: Scope) -> impl IntoView {
fn App() -> impl IntoView {
// here we create a signal in the root that can be consumed
// anywhere in the app.
let (count, set_count) = create_signal(cx, 0);
let (count, set_count) = create_signal(0);
// we'll pass the setter to specific components,
// but provide the count itself to the whole app via context
provide_context(cx, count);
provide_context(count);
view! { cx,
view! {
// SetterButton is allowed to modify the count
<SetterButton set_count/>
// These consumers can only read from it
@@ -57,14 +57,14 @@ fn App(cx: Scope) -> impl IntoView {
```rust
/// A component that does some "fancy" math with the global count
#[component]
fn FancyMath(cx: Scope) -> impl IntoView {
fn FancyMath() -> impl IntoView {
// here we consume the global count signal with `use_context`
let count = use_context::<ReadSignal<u32>>(cx)
let count = use_context::<ReadSignal<u32>>()
// we know we just provided this in the parent component
.expect("there to be a `count` signal provided");
let is_even = move || count() & 1 == 0;
view! { cx,
view! {
<div class="consumer blue">
"The number "
<strong>{count}</strong>
@@ -89,17 +89,17 @@ struct GlobalState {
}
impl GlobalState {
pub fn new(cx: Scope) -> Self {
pub fn new() -> Self {
Self {
count: create_rw_signal(cx, 0),
name: create_rw_signal(cx, "Bob".to_string())
count: create_rw_signal(0),
name: create_rw_signal("Bob".to_string())
}
}
}
#[component]
fn App(cx: Scope) -> impl IntoView {
provide_context(cx, GlobalState::new(cx));
fn App() -> impl IntoView {
provide_context(GlobalState::new());
// etc.
}
@@ -117,8 +117,8 @@ struct GlobalState {
}
#[component]
fn App(cx: Scope) -> impl IntoView {
provide_context(cx, create_rw_signal(GlobalState::default()));
fn App() -> impl IntoView {
provide_context(create_rw_signal(GlobalState::default()));
// etc.
}
@@ -127,8 +127,8 @@ fn App(cx: Scope) -> impl IntoView {
But theres a problem: because our whole state is wrapped in one signal, updating the value of one field will cause reactive updates in parts of the UI that only depend on the other.
```rust
let state = expect_context::<RwSignal<GlobalState>>(cx);
view! { cx,
let state = expect_context::<RwSignal<GlobalState>>();
view! {
<button on:click=move |_| state.update(|n| *n += 1)>"+1"</button>
<p>{move || state.with(|state| state.name.clone())}</p>
}
@@ -136,19 +136,19 @@ view! { cx,
In this example, clicking the button will cause the text inside `<p>` to be updated, cloning `state.name` again! Because signals are the atomic unit of reactivity, updating any field of the signal triggers updates to everything that depends on the signal.
Theres a better way. You can use take fine-grained, reactive slices by using [`create_memo`](https://docs.rs/leptos/latest/leptos/fn.create_memo.html) or [`create_slice`](https://docs.rs/leptos/latest/leptos/fn.create_slice.html) (which uses `create_memo` but also provides a setter). “Memoizing” a value means creating a new reactive value which will only update when it changes. “Memoizing a slice” means creating a new reactive value which will only update when some field of the state struct updates.
Theres a better way. You can take fine-grained, reactive slices by using [`create_memo`](https://docs.rs/leptos/latest/leptos/fn.create_memo.html) or [`create_slice`](https://docs.rs/leptos/latest/leptos/fn.create_slice.html) (which uses `create_memo` but also provides a setter). “Memoizing” a value means creating a new reactive value which will only update when it changes. “Memoizing a slice” means creating a new reactive value which will only update when some field of the state struct updates.
Here, instead of reading from the state signal directly, we create “slices” of that state with fine-grained updates via `create_slice`. Each slice signal only updates when the particular piece of the larger struct it accesses updates. This means you can create a single root signal, and then take independent, fine-grained slices of it in different components, each of which can update without notifying the others of changes.
```rust
/// A component that updates the count in the global state.
#[component]
fn GlobalStateCounter(cx: Scope) -> impl IntoView {
let state = expect_context::<RwSignal<GlobalState>>(cx);
fn GlobalStateCounter() -> impl IntoView {
let state = expect_context::<RwSignal<GlobalState>>();
// `create_slice` lets us create a "lens" into the data
let (count, set_count) = create_slice(
cx,
// we take a slice *from* `state`
state,
// our getter returns a "slice" of the data
@@ -157,7 +157,7 @@ fn GlobalStateCounter(cx: Scope) -> impl IntoView {
|state, n| state.count = n,
);
view! { cx,
view! {
<div class="consumer blue">
<button
on:click=move |_| {
@@ -183,3 +183,221 @@ data flow and of fine-grained reactive updates.
[Click to open CodeSandbox.](https://codesandbox.io/p/sandbox/1-basic-component-forked-8bte19?selection=%5B%7B%22endColumn%22%3A1%2C%22endLineNumber%22%3A2%2C%22startColumn%22%3A1%2C%22startLineNumber%22%3A2%7D%5D&file=%2Fsrc%2Fmain.rs)
<iframe src="https://codesandbox.io/p/sandbox/1-basic-component-forked-8bte19?selection=%5B%7B%22endColumn%22%3A1%2C%22endLineNumber%22%3A2%2C%22startColumn%22%3A1%2C%22startLineNumber%22%3A2%7D%5D&file=%2Fsrc%2Fmain.rs" width="100%" height="1000px" style="max-height: 100vh"></iframe>
<details>
<summary>CodeSandbox Source</summary>
```rust
use leptos::*;
// So far, we've only been working with local state in components
// We've only seen how to communicate between parent and child components
// But there are also more general ways to manage global state
//
// The three best approaches to global state are
// 1. Using the router to drive global state via the URL
// 2. Passing signals through context
// 3. Creating a global state struct and creating lenses into it with `create_slice`
//
// Option #1: URL as Global State
// The next few sections of the tutorial will be about the router.
// So for now, we'll just look at options #2 and #3.
// Option #2: Pass Signals through Context
//
// In virtual DOM libraries like React, using the Context API to manage global
// state is a bad idea: because the entire app exists in a tree, changing
// some value provided high up in the tree can cause the whole app to render.
//
// In fine-grained reactive libraries like Leptos, this is simply not the case.
// You can create a signal in the root of your app and pass it down to other
// components using provide_context(). Changing it will only cause rerendering
// in the specific places it is actually used, not the whole app.
#[component]
fn Option2() -> impl IntoView {
// here we create a signal in the root that can be consumed
// anywhere in the app.
let (count, set_count) = create_signal(0);
// we'll pass the setter to specific components,
// but provide the count itself to the whole app via context
provide_context(count);
view! {
<h1>"Option 2: Passing Signals"</h1>
// SetterButton is allowed to modify the count
<SetterButton set_count/>
// These consumers can only read from it
// But we could give them write access by passing `set_count` if we wanted
<div style="display: flex">
<FancyMath/>
<ListItems/>
</div>
}
}
/// A button that increments our global counter.
#[component]
fn SetterButton(set_count: WriteSignal<u32>) -> impl IntoView {
view! {
<div class="provider red">
<button on:click=move |_| set_count.update(|count| *count += 1)>
"Increment Global Count"
</button>
</div>
}
}
/// A component that does some "fancy" math with the global count
#[component]
fn FancyMath() -> impl IntoView {
// here we consume the global count signal with `use_context`
let count = use_context::<ReadSignal<u32>>()
// we know we just provided this in the parent component
.expect("there to be a `count` signal provided");
let is_even = move || count() & 1 == 0;
view! {
<div class="consumer blue">
"The number "
<strong>{count}</strong>
{move || if is_even() {
" is"
} else {
" is not"
}}
" even."
</div>
}
}
/// A component that shows a list of items generated from the global count.
#[component]
fn ListItems() -> impl IntoView {
// again, consume the global count signal with `use_context`
let count = use_context::<ReadSignal<u32>>().expect("there to be a `count` signal provided");
let squares = move || {
(0..count())
.map(|n| view! { <li>{n}<sup>"2"</sup> " is " {n * n}</li> })
.collect::<Vec<_>>()
};
view! {
<div class="consumer green">
<ul>{squares}</ul>
</div>
}
}
// Option #3: Create a Global State Struct
//
// You can use this approach to build a single global data structure
// that holds the state for your whole app, and then access it by
// taking fine-grained slices using `create_slice` or `create_memo`,
// so that changing one part of the state doesn't cause parts of your
// app that depend on other parts of the state to change.
#[derive(Default, Clone, Debug)]
struct GlobalState {
count: u32,
name: String,
}
#[component]
fn Option3() -> impl IntoView {
// we'll provide a single signal that holds the whole state
// each component will be responsible for creating its own "lens" into it
let state = create_rw_signal(GlobalState::default());
provide_context(state);
view! {
<h1>"Option 3: Passing Signals"</h1>
<div class="red consumer" style="width: 100%">
<h2>"Current Global State"</h2>
<pre>
{move || {
format!("{:#?}", state.get())
}}
</pre>
</div>
<div style="display: flex">
<GlobalStateCounter/>
<GlobalStateInput/>
</div>
}
}
/// A component that updates the count in the global state.
#[component]
fn GlobalStateCounter() -> impl IntoView {
let state = use_context::<RwSignal<GlobalState>>().expect("state to have been provided");
// `create_slice` lets us create a "lens" into the data
let (count, set_count) = create_slice(
// we take a slice *from* `state`
state,
// our getter returns a "slice" of the data
|state| state.count,
// our setter describes how to mutate that slice, given a new value
|state, n| state.count = n,
);
view! {
<div class="consumer blue">
<button
on:click=move |_| {
set_count(count() + 1);
}
>
"Increment Global Count"
</button>
<br/>
<span>"Count is: " {count}</span>
</div>
}
}
/// A component that updates the count in the global state.
#[component]
fn GlobalStateInput() -> impl IntoView {
let state = use_context::<RwSignal<GlobalState>>().expect("state to have been provided");
// this slice is completely independent of the `count` slice
// that we created in the other component
// neither of them will cause the other to rerun
let (name, set_name) = create_slice(
// we take a slice *from* `state`
state,
// our getter returns a "slice" of the data
|state| state.name.clone(),
// our setter describes how to mutate that slice, given a new value
|state, n| state.name = n,
);
view! {
<div class="consumer green">
<input
type="text"
prop:value=name
on:input=move |ev| {
set_name(event_target_value(&ev));
}
/>
<br/>
<span>"Name is: " {name}</span>
</div>
}
}
// This `main` function is the entry point into the app
// It just mounts our component to the <body>
// Because we defined it as `fn App`, we can now use it in a
// template as <App/>
fn main() {
leptos::mount_to_body(|| view! { <Option2/><Option3/> })
}
```
</details>
</preview>

View File

@@ -12,6 +12,7 @@
- [Error Handling](./view/07_errors.md)
- [Parent-Child Communication](./view/08_parent_child.md)
- [Passing Children to Components](./view/09_component_children.md)
- [No Macros: The View Builder Syntax](./view/builder.md)
- [Reactivity](./reactivity/README.md)
- [Working with Signals](./reactivity/working_with_signals.md)
- [Responding to Changes with `create_effect`](./reactivity/14_create_effect.md)
@@ -23,7 +24,6 @@
- [Transition](./async/12_transition.md)
- [Actions](./async/13_actions.md)
- [Interlude: Projecting Children](./interlude_projecting_children.md)
- [Responding to Changes with `create_effect`](./14_create_effect.md)
- [Global State Management](./15_global_state.md)
- [Router](./router/README.md)
- [Defining `<Routes/>`](./router/16_routes.md)
@@ -44,5 +44,6 @@
- [Responses and Redirects](./server/27_response.md)
- [Progressive Enhancement and Graceful Degradation](./progressive_enhancement/README.md)
- [`<ActionForm/>`s](./progressive_enhancement/action_form.md)
- [Deployment]()
- [Deployment](./deployment.md)
- [Appendix: How Does the Reactive System Work?](./appendix_reactive_graph.md)
- [Appendix: Optimizing WASM Binary Size](./appendix_binary_size.md)

View File

@@ -0,0 +1,243 @@
# Appendix: How does the Reactive System Work?
You dont need to know very much about how the reactive system actually works in order to use the library successfully. But its always useful to understand whats going on behind the scenes once you start working with the framework at an advanced level.
The reactive primitives you use are divided into three sets:
- **Signals** (`ReadSignal`/`WriteSignal`, `RwSignal`, `Resource`, `Trigger`) Values you can actively change to trigger reactive updates.
- **Computations** (`Memo`s) Values that depend on signals (or other computations) and derive a new reactive value through some pure computation.
- **Effects** Observers that listen to changes in some signals or computations and run a function, causing some side effect.
Derived signals are a kind of non-primitve computation: as plain closures, they simply allow you to refactor some repeated signal-based computation into a reusable function that can be called in multiple places, but they are not represented in the reactive system itself.
All the other primitives actually exist in the reactive system as nodes in a reactive graph.
Most of the work of the reactive system consists of propagating changes from signals to effects, possibly through some intervening memos.
The assumption of the reactive system is that effects (like rendering to the DOM or making a network request) are orders of magnitude more expensive than things like updating a Rust data structure inside your app.
So the **primary goal** of the reactive system is to **run effects as infrequently as possible**.
Leptos does this through the construction of a reactive graph.
> Leptoss current reactive system is based heavily on the [Reactively](https://github.com/modderme123/reactively) library for JavaScript. You can read Milos article “[Super-Charging Fine-Grained Reactivity](https://dev.to/modderme123/super-charging-fine-grained-reactive-performance-47ph)” for an excellent account of its algorithm, as well as fine-grained reactivity in general—including some beautiful diagrams!
## The Reactive Graph
Signals, memos, and effects all share three characteristics:
- **Value** They have a current value: either the signals value, or (for memos and effects) the value returned by the previous run, if any.
- **Sources** Any other reactive primitives they depend on. (For signals, this is an empty set.)
- **Subscribers** Any other reactive primitives that depend on them. (For effects, this is an empty set.)
In reality then, signals, memos, and effects are just conventional names for one generic concept of a “node” in a reactive graph. Signals are always “root nodes,” with no sources/parents. Effects are always “leaf nodes,” with no subscribers. Memos typically have both sources and subscribers.
### Simple Dependencies
So imagine the following code:
```rust
// A
let (name, set_name) = create_signal("Alice");
// B
let name_upper = create_memo(move |_| name.with(|n| n.to_uppercase()));
// C
create_effect(move |_| {
log!("{}", name_upper());
});
set_name("Bob");
```
You can easily imagine the reactive graph here: `name` is the only signal/origin node, the `create_effect` is the only effect/terminal node, and theres one intervening memo.
```
A (name)
|
B (name_upper)
|
C (the effect)
```
### Splitting Branches
Lets make it a little more complex.
```rust
// A
let (name, set_name) = create_signal("Alice");
// B
let name_upper = create_memo(move |_| name.with(|n| n.to_uppercase()));
// C
let name_len = create_memo(move |_| name.len());
// D
create_effect(move |_| {
log!("len = {}", name_len());
});
// E
create_effect(move |_| {
log!("name = {}", name_upper());
});
```
This is also pretty straightforward: a signal source signal (`name`/`A`) divides into two parallel tracks: `name_upper`/`B` and `name_len`/`C`, each of which has an effect that depends on it.
```
__A__
| |
B C
| |
D E
```
Now lets update the signal.
```rust
set_name("Bob");
```
We immediately log
```
len = 3
name = BOB
```
Lets do it again.
```rust
set_name("Tim");
```
The log should shows
```
name = TIM
```
`len = 3` does not log again.
Remember: the goal of the reactive system is to run effects as infrequently as possible. Changing `name` from `"Bob"` to `"Tim"` will cause each of the memos to re-run. But they will only notify their subscribers if their value has actually changed. `"BOB"` and `"TIM"` are different, so that effect runs again. But both names have the length `3`, so they do not run again.
### Reuniting Branches
One more example, of whats sometimes called **the diamond problem**.
```rust
// A
let (name, set_name) = create_signal("Alice");
// B
let name_upper = create_memo(move |_| name.with(|n| n.to_uppercase()));
// C
let name_len = create_memo(move |_| name.len());
// D
create_effect(move |_| {
log!("{} is {} characters long", name_upper(), name_len());
});
```
What does the graph look like for this?
```
__A__
| |
B C
| |
|__D__|
```
You can see why it's called the “diamond problem.” If Id connected the nodes with straight lines instead of bad ASCII art, it would form a diamond: two memos, each of which depend on a signal, which feed into the same effect.
A naive, push-based reactive implementation would cause this effect to run twice, which would be bad. (Remember, our goal is to run effects as infrequently as we can.) For example, you could implement a reactive system such that signals and memos immediately propagate their changes all the way down the graph, through each dependency, essentially traversing the graph depth-first. In other words, updating `A` would notify `B`, which would notify `D`; then `A` would notify `C`, which would notify `D` again. This is both inefficient (`D` runs twice) and glitchy (`D` actually runs with the incorrect value for the second memo during its first run.)
## Solving the Diamond Problem
Any reactive implementation worth its salt is dedicated to solving this issue. There are a number of different approaches (again, [see Milos article](https://dev.to/modderme123/super-charging-fine-grained-reactive-performance-47ph) for an excellent overview).
Heres how ours works, in brief.
A reactive node is always in one of three states:
- `Clean`: it is known not to have changed
- `Check`: it is possible it has changed
- `Dirty`: it has definitely changed
Updating a signal `Dirty` marks that signal `Dirty`, and marks all its descendants `Check`, recursively. Any of its descendants that are effects are added to a queue to be re-run.
```
____A (DIRTY)___
| |
B (CHECK) C (CHECK)
| |
|____D (CHECK)__|
```
Now those effects are run. (All of the effects will be marked `Check` at this point.) Before re-running its computation, the effect checks its parents to see if they are dirty. So
- So `D` goes to `B` and checks if it is `Dirty`.
- But `B` is also marked `Check`. So `B` does the same thing:
- `B` goes to `A`, and finds that it is `Dirty`.
- This means `B` needs to re-run, because one of its sources has changed.
- `B` re-runs, generating a new value, and marks itself `Clean`
- Because `B` is a memo, it then checks its prior value against the new value.
- If they are the same, `B` returns "no change." Otherwise, it returns "yes, I changed."
- If `B` returned “yes, I changed,” `D` knows that it definitely needs to run and re-runs immediately before checking any other sources.
- If `B` returned “no, I didnt change,” `D` continues on to check `C` (see process above for `B`.)
- If neither `B` nor `C` has changed, the effect does not need to re-run.
- If either `B` or `C` did change, the effect now re-runs.
Because the effect is only marked `Check` once and only queued once, it only runs once.
If the naive version was a “push-based” reactive system, simply pushing reactive changes all the way down the graph and therefore running the effect twice, this version could be called “push-pull.” It pushes the `Check` status all the way down the graph, but then “pulls” its way back up. In fact, for large graphs it may end up bouncing back up and down and left and right on the graph as it tries to determine exactly which nodes need to re-run.
**Note this important trade-off**: Push-based reactivity propagates signal changes more quickly, at the expense of over-re-running memos and effects. Remember: the reactive system is designed to minimize how often you re-run effects, on the (accurate) assumption that side effects are orders of magnitude more expensive than this kind of cache-friendly graph traversal happening entirely inside the librarys Rust code. The measurement of a good reactive system is not how quickly it propagates changes, but how quickly it propagates changes _without over-notifying_.
## Memos vs. Signals
Note that signals always notify their children; i.e., a signal is always marked `Dirty` when it updates, even if its new value is the same as the old value. Otherwise, wed have to require `PartialEq` on signals, and this is actually quite an expensive check on some types. (For example, add an unnecessary equality check to something like `some_vec_signal.update(|n| n.pop())` when its clear that it has in fact changed.)
Memos, on the other hand, check whether they change before notifying their children. They only run their calculation once, no matter how many times you `.get()` the result, but they run whenever their signal sources change. This means that if the memos computation is _very_ expensive, you may actually want to memoize its inputs as well, so that the memo only re-calculates when it is sure its inputs have changed.
## Memos vs. Derived Signals
All of this is cool, and memos are pretty great. But most actual applications have reactive graphs that are quite shallow and quite wide: you might have 100 source signals and 500 effects, but no memos or, in rare case, three or four memos between the signal and the effect. Memos are extremely good at what they do: limiting how often they notify their subscribers that they have changed. But as this description of the reactive system should show, they come with overhead in two forms:
1. A `PartialEq` check, which may or may not be expensive.
2. Added memory cost of storing another node in the reactive system.
3. Added computational cost of reactive graph traversal.
In cases in which the computation itself is cheaper than this reactive work, you should avoid “over-wrapping” with memos and simply use derived signals. Heres a great example in which you should never use a memo:
```rust
let (a, set_a) = create_signal(1);
// none of these make sense as memos
let b = move || a() + 2;
let c = move || b() % 2 == 0;
let d = move || if c() { "even" } else { "odd" };
set_a(2);
set_a(3);
set_a(5);
```
Even though memoizing would technically save an extra calculation of `d` between setting `a` to `3` and `5`, these calculations are themselves cheaper than the reactive algorithm.
At the very most, you might consider memoizing the final node before running some expensive side effect:
```rust
let text = create_memo(move |_| {
d()
});
create_effect(move |_| {
engrave_text_into_bar_of_gold(&text());
});
```

View File

@@ -2,7 +2,7 @@
A [Resource](https://docs.rs/leptos/latest/leptos/struct.Resource.html) is a reactive data structure that reflects the current state of an asynchronous task, allowing you to integrate asynchronous `Future`s into the synchronous reactive system. Rather than waiting for its data to load with `.await`, you transform the `Future` into a signal that returns `Some(T)` if it has resolved, and `None` if its still pending.
You do this by using the [`create_resource`](https://docs.rs/leptos/latest/leptos/fn.create_resource.html) function. This takes two arguments (other than the ubiquitous `cx`):
You do this by using the [`create_resource`](https://docs.rs/leptos/latest/leptos/fn.create_resource.html) function. This takes two arguments:
1. a source signal, which will generate a new `Future` whenever it changes
2. a fetcher function, which takes the data from that signal and returns a `Future`
@@ -11,14 +11,14 @@ Heres an example
```rust
// our source signal: some synchronous, local state
let (count, set_count) = create_signal(cx, 0);
let (count, set_count) = create_signal(0);
// our resource
let async_data = create_resource(cx,
let async_data = create_resource(
count,
// every time `count` changes, this will run
|value| async move {
log!("loading data from API");
logging::log!("loading data from API");
load_data(value).await
},
);
@@ -27,23 +27,20 @@ let async_data = create_resource(cx,
To create a resource that simply runs once, you can pass a non-reactive, empty source signal:
```rust
let once = create_resource(cx, || (), |_| async move { load_data().await });
let once = create_resource(|| (), |_| async move { load_data().await });
```
To access the value you can use `.read(cx)` or `.with(cx, |data| /* */)`. These work just like `.get()` and `.with()` on a signal—`read` clones the value and returns it, `with` applies a closure to it—but with two differences
1. For any `Resource<_, T>`, they always return `Option<T>`, not `T`: because its always possible that your resource is still loading.
2. They take a `Scope` argument. Youll see why in the next chapter, on `<Suspense/>`.
To access the value you can use `.read()` or `.with(|data| /* */)`. These work just like `.get()` and `.with()` on a signal—`read` clones the value and returns it, `with` applies a closure to it—but for any `Resource<_, T>`, they always return `Option<T>`, not `T`: because its always possible that your resource is still loading.
So, you can show the current state of a resource in your view:
```rust
let once = create_resource(cx, || (), |_| async move { load_data().await });
view! { cx,
let once = create_resource(|| (), |_| async move { load_data().await });
view! {
<h1>"My Data"</h1>
{move || match once.read(cx) {
None => view! { cx, <p>"Loading..."</p> }.into_view(cx),
Some(data) => view! { cx, <ShowData data/> }.into_view(cx)
{move || match once.read() {
None => view! { <p>"Loading..."</p> }.into_view(),
Some(data) => view! { <ShowData data/> }.into_view()
}}
}
```
@@ -53,3 +50,89 @@ Resources also provide a `refetch()` method that allows you to manually reload t
[Click to open CodeSandbox.](https://codesandbox.io/p/sandbox/10-async-resources-4z0qt3?file=%2Fsrc%2Fmain.rs&selection=%5B%7B%22endColumn%22%3A1%2C%22endLineNumber%22%3A3%2C%22startColumn%22%3A1%2C%22startLineNumber%22%3A3%7D%5D)
<iframe src="https://codesandbox.io/p/sandbox/10-async-resources-4z0qt3?file=%2Fsrc%2Fmain.rs&selection=%5B%7B%22endColumn%22%3A1%2C%22endLineNumber%22%3A3%2C%22startColumn%22%3A1%2C%22startLineNumber%22%3A3%7D%5D" width="100%" height="1000px" style="max-height: 100vh"></iframe>
<details>
<summary>CodeSandbox Source</summary>
```rust
use gloo_timers::future::TimeoutFuture;
use leptos::*;
// Here we define an async function
// This could be anything: a network request, database read, etc.
// Here, we just multiply a number by 10
async fn load_data(value: i32) -> i32 {
// fake a one-second delay
TimeoutFuture::new(1_000).await;
value * 10
}
#[component]
fn App() -> impl IntoView {
// this count is our synchronous, local state
let (count, set_count) = create_signal(0);
// create_resource takes two arguments after its scope
let async_data = create_resource(
// the first is the "source signal"
count,
// the second is the loader
// it takes the source signal's value as its argument
// and does some async work
|value| async move { load_data(value).await },
);
// whenever the source signal changes, the loader reloads
// you can also create resources that only load once
// just return the unit type () from the source signal
// that doesn't depend on anything: we just load it once
let stable = create_resource(|| (), |_| async move { load_data(1).await });
// we can access the resource values with .read()
// this will reactively return None before the Future has resolved
// and update to Some(T) when it has resolved
let async_result = move || {
async_data
.read()
.map(|value| format!("Server returned {value:?}"))
// This loading state will only show before the first load
.unwrap_or_else(|| "Loading...".into())
};
// the resource's loading() method gives us a
// signal to indicate whether it's currently loading
let loading = async_data.loading();
let is_loading = move || if loading() { "Loading..." } else { "Idle." };
view! {
<button
on:click=move |_| {
set_count.update(|n| *n += 1);
}
>
"Click me"
</button>
<p>
<code>"stable"</code>": " {move || stable.read()}
</p>
<p>
<code>"count"</code>": " {count}
</p>
<p>
<code>"async_value"</code>": "
{async_result}
<br/>
{is_loading}
</p>
}
}
fn main() {
leptos::mount_to_body(|| view! { <App/> })
}
```
</details>
</preview>

View File

@@ -3,14 +3,14 @@
In the previous chapter, we showed how you can create a simple loading screen to show some fallback while a resource is loading.
```rust
let (count, set_count) = create_signal(cx, 0);
let a = create_resource(cx, count, |count| async move { load_a(count).await });
let (count, set_count) = create_signal(0);
let once = create_resource(count, |count| async move { load_a(count).await });
view! { cx,
view! {
<h1>"My Data"</h1>
{move || match once.read(cx) {
None => view! { cx, <p>"Loading..."</p> }.into_view(cx),
Some(data) => view! { cx, <ShowData data/> }.into_view(cx)
{move || match once.read() {
None => view! { <p>"Loading..."</p> }.into_view(),
Some(data) => view! { <ShowData data/> }.into_view()
}}
}
```
@@ -18,19 +18,19 @@ view! { cx,
But what if we have two resources, and want to wait for both of them?
```rust
let (count, set_count) = create_signal(cx, 0);
let (count2, set_count2) = create_signal(cx, 0);
let a = create_resource(cx, count, |count| async move { load_a(count).await });
let b = create_resource(cx, count2, |count| async move { load_b(count).await });
let (count, set_count) = create_signal(0);
let (count2, set_count2) = create_signal(0);
let a = create_resource(count, |count| async move { load_a(count).await });
let b = create_resource(count2, |count| async move { load_b(count).await });
view! { cx,
view! {
<h1>"My Data"</h1>
{move || match (a.read(cx), b.read(cx)) {
(Some(a), Some(b)) => view! { cx,
{move || match (a.read(), b.read()) {
(Some(a), Some(b)) => view! {
<ShowA a/>
<ShowA b/>
}.into_view(cx),
_ => view! { cx, <p>"Loading..."</p> }.into_view(cx)
}.into_view(),
_ => view! { <p>"Loading..."</p> }.into_view()
}}
}
```
@@ -40,26 +40,26 @@ Thats not _so_ bad, but its kind of annoying. What if we could invert the
The [`<Suspense/>`](https://docs.rs/leptos/latest/leptos/fn.Suspense.html) component lets us do exactly that. You give it a `fallback` prop and children, one or more of which usually involves reading from a resource. Reading from a resource “under” a `<Suspense/>` (i.e., in one of its children) registers that resource with the `<Suspense/>`. If its still waiting for resources to load, it shows the `fallback`. When theyve all loaded, it shows the children.
```rust
let (count, set_count) = create_signal(cx, 0);
let (count2, set_count2) = create_signal(cx, 0);
let a = create_resource(cx, count, |count| async move { load_a(count).await });
let b = create_resource(cx, count2, |count| async move { load_b(count).await });
let (count, set_count) = create_signal(0);
let (count2, set_count2) = create_signal(0);
let a = create_resource(count, |count| async move { load_a(count).await });
let b = create_resource(count2, |count| async move { load_b(count).await });
view! { cx,
view! {
<h1>"My Data"</h1>
<Suspense
fallback=move || view! { cx, <p>"Loading..."</p> }
fallback=move || view! { <p>"Loading..."</p> }
>
<h2>"My Data"</h2>
<h3>"A"</h3>
{move || {
a.read(cx)
.map(|a| view! { cx, <ShowA a/> })
a.read()
.map(|a| view! { <ShowA a/> })
}}
<h3>"B"</h3>
{move || {
b.read(cx)
.map(|b| view! { cx, <ShowB b/> })
b.read()
.map(|b| view! { <ShowB b/> })
}}
</Suspense>
}
@@ -69,6 +69,89 @@ Every time one of the resources is reloading, the `"Loading..."` fallback will s
This inversion of the flow of control makes it easier to add or remove individual resources, as you dont need to handle the matching yourself. It also unlocks some massive performance improvements during server-side rendering, which well talk about during a later chapter.
## `<Await/>`
In youre simply trying to wait for some `Future` to resolve before rendering, you may find the `<Await/>` component helpful in reducing boilerplate. `<Await/>` essentially combines a resource with the source argument `|| ()` with a `<Suspense/>` with no fallback.
In other words:
1. It only polls the `Future` once, and does not respond to any reactive changes.
2. It does not render anything until the `Future` resolves.
3. After the `Future` resolves, its binds its data to whatever variable name you choose and then renders its children with that variable in scope.
```rust
async fn fetch_monkeys(monkey: i32) -> i32 {
// maybe this didn't need to be async
monkey * 2
}
view! {
<Await
// `future` provides the `Future` to be resolved
future=|| fetch_monkeys(3)
// the data is bound to whatever variable name you provide
bind:data
>
// you receive the data by reference and can use it in your view here
<p>{*data} " little monkeys, jumping on the bed."</p>
</Await>
}
```
[Click to open CodeSandbox.](https://codesandbox.io/p/sandbox/11-suspense-907niv?file=%2Fsrc%2Fmain.rs)
<iframe src="https://codesandbox.io/p/sandbox/11-suspense-907niv?file=%2Fsrc%2Fmain.rs" width="100%" height="1000px" style="max-height: 100vh"></iframe>
<details>
<summary>CodeSandbox Source</summary>
```rust
use gloo_timers::future::TimeoutFuture;
use leptos::*;
async fn important_api_call(name: String) -> String {
TimeoutFuture::new(1_000).await;
name.to_ascii_uppercase()
}
#[component]
fn App() -> impl IntoView {
let (name, set_name) = create_signal("Bill".to_string());
// this will reload every time `name` changes
let async_data = create_resource(
name,
|name| async move { important_api_call(name).await },
);
view! {
<input
on:input=move |ev| {
set_name(event_target_value(&ev));
}
prop:value=name
/>
<p><code>"name:"</code> {name}</p>
<Suspense
// the fallback will show whenever a resource
// read "under" the suspense is loading
fallback=move || view! { <p>"Loading..."</p> }
>
// the children will be rendered once initially,
// and then whenever any resources has been resolved
<p>
"Your shouting name is "
{move || async_data.read()}
</p>
</Suspense>
}
}
fn main() {
leptos::mount_to_body(|| view! { <App/> })
}
```
</details>
</preview>

View File

@@ -9,3 +9,76 @@ This example shows how you can create a simple tabbed contact list with `<Transi
[Click to open CodeSandbox.](https://codesandbox.io/p/sandbox/12-transition-sn38sd?selection=%5B%7B%22endColumn%22%3A15%2C%22endLineNumber%22%3A2%2C%22startColumn%22%3A15%2C%22startLineNumber%22%3A2%7D%5D&file=%2Fsrc%2Fmain.rs)
<iframe src="https://codesandbox.io/p/sandbox/12-transition-sn38sd?selection=%5B%7B%22endColumn%22%3A15%2C%22endLineNumber%22%3A2%2C%22startColumn%22%3A15%2C%22startLineNumber%22%3A2%7D%5D&file=%2Fsrc%2Fmain.rs" width="100%" height="1000px" style="max-height: 100vh"></iframe>
<details>
<summary>CodeSandbox Source</summary>
```rust
use gloo_timers::future::TimeoutFuture;
use leptos::*;
async fn important_api_call(id: usize) -> String {
TimeoutFuture::new(1_000).await;
match id {
0 => "Alice",
1 => "Bob",
2 => "Carol",
_ => "User not found",
}
.to_string()
}
#[component]
fn App() -> impl IntoView {
let (tab, set_tab) = create_signal(0);
// this will reload every time `tab` changes
let user_data = create_resource(tab, |tab| async move { important_api_call(tab).await });
view! {
<div class="buttons">
<button
on:click=move |_| set_tab(0)
class:selected=move || tab() == 0
>
"Tab A"
</button>
<button
on:click=move |_| set_tab(1)
class:selected=move || tab() == 1
>
"Tab B"
</button>
<button
on:click=move |_| set_tab(2)
class:selected=move || tab() == 2
>
"Tab C"
</button>
{move || if user_data.loading().get() {
"Loading..."
} else {
""
}}
</div>
<Transition
// the fallback will show initially
// on subsequent reloads, the current child will
// continue showing
fallback=move || view! { <p>"Loading..."</p> }
>
<p>
{move || user_data.read()}
</p>
</Transition>
}
}
fn main() {
leptos::mount_to_body(|| view! { <App/> })
}
```
</details>
</preview>

View File

@@ -16,22 +16,22 @@ async fn add_todo_request(new_title: &str) -> Uuid {
}
```
`create_action` takes a reactive `Scope` and an `async` function that takes a reference to a single argument, which you could think of as its “input type.”
`create_action` takes an `async` function that takes a reference to a single argument, which you could think of as its “input type.”
> The input is always a single type. If you want to pass in multiple arguments, you can do it with a struct or tuple.
>
> ```rust
> // if there's a single argument, just use that
> let action1 = create_action(cx, |input: &String| {
> let action1 = create_action(|input: &String| {
> let input = input.clone();
> async move { todo!() }
> });
>
> // if there are no arguments, use the unit type `()`
> let action2 = create_action(cx, |input: &()| async { todo!() });
> let action2 = create_action(|input: &()| async { todo!() });
>
> // if there are multiple arguments, use a tuple
> let action3 = create_action(cx,
> let action3 = create_action(
> |input: &(usize, String)| async { todo!() }
> );
> ```
@@ -41,7 +41,7 @@ async fn add_todo_request(new_title: &str) -> Uuid {
So in this case, all we need to do to create an action is
```rust
let add_todo_action = create_action(cx, |input: &String| {
let add_todo_action = create_action(|input: &String| {
let input = input.to_owned();
async move { add_todo_request(&input).await }
});
@@ -66,9 +66,9 @@ let todo_id = add_todo_action.value(); // RwSignal<Option<Uuid>>
This makes it easy to track the current state of your request, show a loading indicator, or do “optimistic UI” based on the assumption that the submission will succeed.
```rust
let input_ref = create_node_ref::<Input>(cx);
let input_ref = create_node_ref::<Input>();
view! { cx,
view! {
<form
on:submit=move |ev| {
ev.prevent_default(); // don't reload the page...
@@ -94,3 +94,83 @@ Now, theres a chance this all seems a little over-complicated, or maybe too r
[Click to open CodeSandbox.](https://codesandbox.io/p/sandbox/10-async-resources-forked-hgpfp0?selection=%5B%7B%22endColumn%22%3A1%2C%22endLineNumber%22%3A4%2C%22startColumn%22%3A1%2C%22startLineNumber%22%3A4%7D%5D&file=%2Fsrc%2Fmain.rs)
<iframe src="https://codesandbox.io/p/sandbox/10-async-resources-forked-hgpfp0?selection=%5B%7B%22endColumn%22%3A1%2C%22endLineNumber%22%3A4%2C%22startColumn%22%3A1%2C%22startLineNumber%22%3A4%7D%5D&file=%2Fsrc%2Fmain.rs" width="100%" height="1000px" style="max-height: 100vh"></iframe>
<details>
<summary>CodeSandbox Source</summary>
```rust
use gloo_timers::future::TimeoutFuture;
use leptos::{html::Input, *};
use uuid::Uuid;
// Here we define an async function
// This could be anything: a network request, database read, etc.
// Think of it as a mutation: some imperative async action you run,
// whereas a resource would be some async data you load
async fn add_todo(text: &str) -> Uuid {
_ = text;
// fake a one-second delay
TimeoutFuture::new(1_000).await;
// pretend this is a post ID or something
Uuid::new_v4()
}
#[component]
fn App() -> impl IntoView {
// an action takes an async function with single argument
// it can be a simple type, a struct, or ()
let add_todo = create_action(|input: &String| {
// the input is a reference, but we need the Future to own it
// this is important: we need to clone and move into the Future
// so it has a 'static lifetime
let input = input.to_owned();
async move { add_todo(&input).await }
});
// actions provide a bunch of synchronous, reactive variables
// that tell us different things about the state of the action
let submitted = add_todo.input();
let pending = add_todo.pending();
let todo_id = add_todo.value();
let input_ref = create_node_ref::<Input>();
view! {
<form
on:submit=move |ev| {
ev.prevent_default(); // don't reload the page...
let input = input_ref.get().expect("input to exist");
add_todo.dispatch(input.value());
}
>
<label>
"What do you need to do?"
<input type="text"
node_ref=input_ref
/>
</label>
<button type="submit">"Add Todo"</button>
</form>
<p>{move || pending().then(|| "Loading...")}</p>
<p>
"Submitted: "
<code>{move || format!("{:#?}", submitted())}</code>
</p>
<p>
"Pending: "
<code>{move || format!("{:#?}", pending())}</code>
</p>
<p>
"Todo ID: "
<code>{move || format!("{:#?}", todo_id())}</code>
</p>
}
}
fn main() {
leptos::mount_to_body(|| view! { <App/> })
}
```
</details>
</preview>

View File

@@ -0,0 +1,74 @@
# Deployment
There are as many ways to deploy a web application as there are developers, let alone applications. But there are a couple useful tips to keep in mind when deploying an app.
## General Advice
1. Remember: Always deploy Rust apps built in `--release` mode, not debug mode. This has a huge effect on both performance and binary size.
2. Test locally in release mode as well. The framework applies certain optimizations in release mode that it does not apply in debug mode, so its possible for bugs to surface at this point. (If your app behaves differently or you do encounter a bug, its likely a framework-level bug and you should open a GitHub issue with a reproduction.)
> We asked users to submit their deployment setups to help with this chapter. Ill quote from them below, but you can read the full thread [here](https://github.com/leptos-rs/leptos/issues/1152).
## Deploying a Client-Side-Rendered App
If youve been building an app that only uses client-side rendering, working with Trunk as a dev server and build tool, the process is quite easy.
```bash
trunk build --release
```
`trunk build` will create a number of build artifacts in a `dist/` directory. Publishing `dist` somewhere online should be all you need to deploy your app. This should work very similarly to deploying any JavaScript application.
> Read more: [Deploying to Vercel with GitHub Actions](https://github.com/leptos-rs/leptos/issues/1152#issuecomment-1577861900).
## Deploying a Full-Stack App
The most popular way for people to deploy full-stack apps built with `cargo-leptos` is to use a cloud hosting service that supports deployment via a Docker build. Heres a sample `Dockerfile`, which is based on the one we use to deploy the Leptos website.
```dockerfile
# Get started with a build env with Rust nightly
FROM rustlang/rust:nightly-bullseye as builder
# If youre using stable, use this instead
# FROM rust:1.70-bullseye as builder
# Install cargo-binstall, which makes it easier to install other
# cargo extensions like cargo-leptos
RUN wget https://github.com/cargo-bins/cargo-binstall/releases/latest/download/cargo-binstall-x86_64-unknown-linux-musl.tgz
RUN tar -xvf cargo-binstall-x86_64-unknown-linux-musl.tgz
RUN cp cargo-binstall /usr/local/cargo/bin
# Install cargo-leptos
RUN cargo binstall cargo-leptos -y
# Add the WASM target
RUN rustup target add wasm32-unknown-unknown
# Make an /app dir, which everything will eventually live in
RUN mkdir -p /app
WORKDIR /app
COPY . .
# Build the app
RUN cargo leptos build --release -vv
FROM rustlang/rust:nightly-bullseye as runner
# Copy the server binary to the /app directory
COPY --from=builder /app/target/server/release/leptos_start /app/
# /target/site contains our JS/WASM/CSS, etc.
COPY --from=builder /app/target/site /app/site
# Copy Cargo.toml if its needed at runtime
COPY --from=builder /app/Cargo.toml /app/
WORKDIR /app
# Set any required env variables and
ENV RUST_LOG="info"
ENV APP_ENVIRONMENT="production"
ENV LEPTOS_SITE_ADDR="0.0.0.0:8080"
ENV LEPTOS_SITE_ROOT="site"
EXPOSE 8080
# Run the server
CMD ["/app/leptos_start"]
```
> Read more: [`gnu` and `musl` build files for Leptos apps](https://github.com/leptos-rs/leptos/issues/1152#issuecomment-1634916088).

View File

@@ -7,12 +7,12 @@ As you build components you may occasionally find yourself wanting to “project
Consider the following:
```rust
pub fn LoggedIn<F, IV>(cx: Scope, fallback: F, children: ChildrenFn) -> impl IntoView
pub fn LoggedIn<F, IV>(fallback: F, children: ChildrenFn) -> impl IntoView
where
F: Fn(Scope) -> IV + 'static,
F: Fn() -> IV + 'static,
IV: IntoView,
{
view! { cx,
view! {
<Suspense
fallback=|| ()
>
@@ -22,7 +22,7 @@ where
when=move || todo!()
fallback=fallback
>
{children(cx)}
{children()}
</Show>
</Suspense>
}
@@ -50,18 +50,16 @@ If you want to really understand the issue here, it may help to look at the expa
```rust
Suspense(
cx,
::leptos::component_props_builder(&Suspense)
.fallback(|| ())
.children({
// fallback and children are moved into this closure
Box::new(move |cx| {
Box::new(move || {
{
// fallback and children captured here
leptos::Fragment::lazy(|| {
vec![
(Show(
cx,
::leptos::component_props_builder(&Show)
.when(|| true)
// but fallback is moved into Show here
@@ -70,7 +68,7 @@ Suspense(
.children(children)
.build(),
)
.into_view(cx)),
.into_view()),
]
})
}
@@ -91,22 +89,22 @@ We can solve this problem by using the [`store_value`](https://docs.rs/leptos/la
In this case, its really simple:
```rust
pub fn LoggedIn<F, IV>(cx: Scope, fallback: F, children: ChildrenFn) -> impl IntoView
pub fn LoggedIn<F, IV>(F, children: ChildrenFn) -> impl IntoView
where
F: Fn(Scope) -> IV + 'static,
F: Fn() -> IV + 'static,
IV: IntoView,
{
let fallback = store_value(cx, fallback);
let children = store_value(cx, children);
view! { cx,
let fallback = store_value(fallback);
let children = store_value(children);
view! {
<Suspense
fallback=|| ()
>
<Show
when=|| todo!()
fallback=move |cx| fallback.with_value(|fallback| fallback(cx))
fallback=move || fallback.with_value(|fallback| fallback())
>
{children.with_value(|children| children(cx))}
{children.with_value(|children| children())}
</Show>
</Suspense>
}
@@ -125,9 +123,9 @@ Consider this example
```rust
#[component]
pub fn App(cx: Scope) -> impl IntoView {
pub fn App() -> impl IntoView {
let name = "Alice".to_string();
view! { cx,
view! {
<Outer>
<Inner>
<Inmost name=name.clone()/>
@@ -137,18 +135,18 @@ pub fn App(cx: Scope) -> impl IntoView {
}
#[component]
pub fn Outer(cx: Scope, children: ChildrenFn) -> impl IntoView {
children(cx)
pub fn Outer(ChildrenFn) -> impl IntoView {
children()
}
#[component]
pub fn Inner(cx: Scope, children: ChildrenFn) -> impl IntoView {
children(cx)
pub fn Inner(ChildrenFn) -> impl IntoView {
children()
}
#[component]
pub fn Inmost(cx: Scope, name: String) -> impl IntoView {
view! { cx,
pub fn Inmost(ng) -> impl IntoView {
view! {
<p>{name}</p>
}
}
@@ -165,7 +163,7 @@ Its captured through multiple levels of children that need to run more than o
In this case, the `clone:` syntax comes in handy. Calling `clone:name` will clone `name` _before_ moving it into `<Inner/>`s children, which solves our ownership issue.
```rust
view! { cx,
view! {
<Outer>
<Inner clone:name>
<Inmost name=name.clone()/>

View File

@@ -14,10 +14,10 @@ This allows you to write components like this:
```rust
#[component]
fn Home(cx: Scope) -> impl IntoView {
let (count, set_count) = create_signal(cx, 0);
fn Home() -> impl IntoView {
let (count, set_count) = create_signal(0);
view! { cx,
view! {
<main class="my-0 mx-auto max-w-3xl text-center">
<h2 class="p-6 text-4xl">"Welcome to Leptos with Tailwind"</h2>
<p class="px-10 pb-10 text-left">"Tailwind will scan your Rust files for Tailwind class names and compile them into a CSS file."</p>
@@ -48,7 +48,7 @@ This allows you to write components like this:
use stylers::style;
#[component]
pub fn App(cx: Scope) -> impl IntoView {
pub fn App() -> impl IntoView {
let styler_class = style! { "App",
#two{
color: blue;
@@ -74,7 +74,7 @@ pub fn App(cx: Scope) -> impl IntoView {
}
};
view! { cx, class = styler_class,
view! { class = styler_class,
<div class="one">
<h1 id="two">"Hello"</h1>
<h2>"World"</h2>
@@ -93,7 +93,7 @@ pub fn App(cx: Scope) -> impl IntoView {
use styled::style;
#[component]
pub fn MyComponent(cx: Scope) -> impl IntoView {
pub fn MyComponent() -> impl IntoView {
let styles = style!(
div {
background-color: red;
@@ -101,7 +101,7 @@ pub fn MyComponent(cx: Scope) -> impl IntoView {
}
);
styled::view! { cx, styles,
styled::view! { styles,
<div>"This text should be red with white text."</div>
}
}

View File

@@ -3,12 +3,13 @@
[`<ActionForm/>`](https://docs.rs/leptos_router/latest/leptos_router/fn.ActionForm.html) is a specialized `<Form/>` that takes a server action, and automatically dispatches it on form submission. This allows you to call a server function directly from a `<form>`, even without JS/WASM.
The process is simple:
1. Define a server function using the [`#[server]` macro](https://docs.rs/leptos/latest/leptos/attr.server.html) (see [Server Functions](../server/25_server_functions.md).)
2. Create an action using [`create_server_action`](https://docs.rs/leptos/latest/leptos/fn.create_server_action.html), specifying the type of the server function youve defined.
3. Create an `<ActionForm/>`, providing the server action in the `action` prop.
4. Pass the named arguments to the server function as form fields with the same names.
> **Note:** `<ActionForm/>` only works with the default URL-encoded `POST` encoding for server functions, to ensure graceful degradation/correct behavior as an HTML form.
> **Note:** `<ActionForm/>` only works with the default URL-encoded `POST` encoding for server functions, to ensure graceful degradation/correct behavior as an HTML form.
```rust
#[server(AddTodo, "/api")]
@@ -17,14 +18,14 @@ pub async fn add_todo(title: String) -> Result<(), ServerFnError> {
}
#[component]
fn AddTodo(cx: Scope) -> impl IntoView {
let add_todo = create_server_action::<AddTodo>(cx);
fn AddTodo() -> impl IntoView {
let add_todo = create_server_action::<AddTodo>();
// holds the latest *returned* value from the server
let value = add_todo.value();
// check if the server has returned an error
let has_error = move || value.with(|val| matches!(val, Some(Err(_))));
view! { cx,
view! {
<ActionForm action=add_todo>
<label>
"Add a Todo"
@@ -36,6 +37,7 @@ fn AddTodo(cx: Scope) -> impl IntoView {
}
}
```
Its really that easy. With JS/WASM, your form will submit without a page reload, storing its most recent submission in the `.input()` signal of the action, its pending status in `.pending()`, and so on. (See the [`Action`](https://docs.rs/leptos/latest/leptos/struct.Action.html) docs for a refresher, if you need.) Without JS/WASM, your form will submit with a page reload. If you call a `redirect` function (from `leptos_axum` or `leptos_actix`) it will redirect to the correct page. By default, it will redirect back to the page youre currently on. The power of HTML, HTTP, and isomorphic rendering mean that your `<ActionForm/>` simply works, even with no JS/WASM.
## Client-Side Validation
@@ -53,4 +55,4 @@ let on_submit = move |ev| {
ev.prevent_default();
}
}
```
```

View File

@@ -9,10 +9,10 @@ Hidden behind the whole reactive DOM renderer that weve seen so far is a func
[`create_effect`](https://docs.rs/leptos_reactive/latest/leptos_reactive/fn.create_effect.html) takes a function as its argument. It immediately runs the function. If you access any reactive signal inside that function, it registers the fact that the effect depends on that signal with the reactive runtime. Whenever one of the signals that the effect depends on changes, the effect runs again.
```rust
let (a, set_a) = create_signal(cx, 0);
let (b, set_b) = create_signal(cx, 0);
let (a, set_a) = create_signal(0);
let (b, set_b) = create_signal(0);
create_effect(cx, move |_| {
create_effect(move |_| {
// immediately prints "Value: 0" and subscribes to `a`
log::debug!("Value: {}", a());
});
@@ -42,15 +42,14 @@ While theyre not a “zero-cost abstraction” in the most technical sense—
Imagine that Im creating some kind of chat software, and I want people to be able to display their full name, or just their first name, and to notify the server whenever their name changes:
```rust
let (first, set_first) = create_signal(cx, String::new());
let (last, set_last) = create_signal(cx, String::new());
let (use_last, set_use_last) = create_signal(cx, true);
let (first, set_first) = create_signal(String::new());
let (last, set_last) = create_signal(String::new());
let (use_last, set_use_last) = create_signal(true);
// this will add the name to the log
// any time one of the source signals changes
create_effect(cx, move |_| {
create_effect(move |_| {
log(
cx,
if use_last() {
format!("{} {}", first(), last())
} else {
@@ -77,9 +76,9 @@ If you need to synchronize some reactive value with the non-reactive world outsi
Weve managed to get this far without mentioning effects because theyre built into the Leptos DOM renderer. Weve seen that you can create a signal and pass it into the `view` macro, and it will update the relevant DOM node whenever the signal changes:
```rust
let (count, set_count) = create_signal(cx, 0);
let (count, set_count) = create_signal(0);
view! { cx,
view! {
<p>{count}</p>
}
```
@@ -87,13 +86,13 @@ view! { cx,
This works because the framework essentially creates an effect wrapping this update. You can imagine Leptos translating this view into something like this:
```rust
let (count, set_count) = create_signal(cx, 0);
let (count, set_count) = create_signal(0);
// create a DOM element
let p = create_element("p");
// create an effect to reactively update the text
create_effect(cx, move |prev_value| {
create_effect(move |prev_value| {
// first, access the signals value and convert it to a string
let text = count().to_string();
@@ -109,6 +108,225 @@ create_effect(cx, move |prev_value| {
Every time `count` is updated, this effect wil rerun. This is what allows reactive, fine-grained updates to the DOM.
## Explicit, Cancelable Tracking with `watch`
In addition to `create_effect`, Leptos provides a [`watch`](https://docs.rs/leptos_reactive/latest/leptos_reactive/fn.watch.html) function, which can be used for two main purposes:
1. Separating tracking and responding to changes by explicitly passing in a set of values to track.
2. Canceling tracking by calling a stop function.
Like `create_resource`, `watch` takes a first argument, which is reactively tracked, and a second, which is not. Whenever a reactive value in its `deps` argument is changed, the `callback` is run. `watch` returns a function that can be called to stop tracking the dependencies.
```rust
let (num, set_num) = create_signal(0);
let stop = watch(
move || num.get(),
move |num, prev_num, _| {
log::debug!("Number: {}; Prev: {:?}", num, prev_num);
},
false,
);
set_num.set(1); // > "Number: 1; Prev: Some(0)"
stop(); // stop watching
set_num.set(2); // (nothing happens)
```
[Click to open CodeSandbox.](https://codesandbox.io/p/sandbox/serene-thompson-40974n?file=%2Fsrc%2Fmain.rs&selection=%5B%7B%22endColumn%22%3A1%2C%22endLineNumber%22%3A2%2C%22startColumn%22%3A1%2C%22startLineNumber%22%3A2%7D%5D)
<iframe src="https://codesandbox.io/p/sandbox/serene-thompson-40974n?file=%2Fsrc%2Fmain.rs&selection=%5B%7B%22endColumn%22%3A1%2C%22endLineNumber%22%3A2%2C%22startColumn%22%3A1%2C%22startLineNumber%22%3A2%7D%5D" width="100%" height="1000px" style="max-height: 100vh"></iframe>
<details>
<summary>CodeSandbox Source</summary>
```rust
use leptos::html::Input;
use leptos::*;
#[component]
fn App() -> impl IntoView {
// Just making a visible log here
// You can ignore this...
let log = create_rw_signal::<Vec<String>>(vec![]);
let logged = move || log().join("\n");
provide_context(log);
view! {
<CreateAnEffect/>
<pre>{logged}</pre>
}
}
#[component]
fn CreateAnEffect() -> impl IntoView {
let (first, set_first) = create_signal(String::new());
let (last, set_last) = create_signal(String::new());
let (use_last, set_use_last) = create_signal(true);
// this will add the name to the log
// any time one of the source signals changes
create_effect(move |_| {
log(
if use_last() {
format!("{} {}", first(), last())
} else {
first()
},
)
});
view! {
<h1><code>"create_effect"</code> " Version"</h1>
<form>
<label>
"First Name"
<input type="text" name="first" prop:value=first
on:change=move |ev| set_first(event_target_value(&ev))
/>
</label>
<label>
"Last Name"
<input type="text" name="last" prop:value=last
on:change=move |ev| set_last(event_target_value(&ev))
/>
</label>
<label>
"Show Last Name"
<input type="checkbox" name="use_last" prop:checked=use_last
on:change=move |ev| set_use_last(event_target_checked(&ev))
/>
</label>
</form>
}
}
#[component]
fn ManualVersion() -> impl IntoView {
let first = create_node_ref::<Input>();
let last = create_node_ref::<Input>();
let use_last = create_node_ref::<Input>();
let mut prev_name = String::new();
let on_change = move |_| {
log(" listener");
let first = first.get().unwrap();
let last = last.get().unwrap();
let use_last = use_last.get().unwrap();
let this_one = if use_last.checked() {
format!("{} {}", first.value(), last.value())
} else {
first.value()
};
if this_one != prev_name {
log(&this_one);
prev_name = this_one;
}
};
view! {
<h1>"Manual Version"</h1>
<form on:change=on_change>
<label>
"First Name"
<input type="text" name="first"
node_ref=first
/>
</label>
<label>
"Last Name"
<input type="text" name="last"
node_ref=last
/>
</label>
<label>
"Show Last Name"
<input type="checkbox" name="use_last"
checked
node_ref=use_last
/>
</label>
</form>
}
}
#[component]
fn EffectVsDerivedSignal() -> impl IntoView {
let (my_value, set_my_value) = create_signal(String::new());
// Don't do this.
/*let (my_optional_value, set_optional_my_value) = create_signal(Option::<String>::None);
create_effect(move |_| {
if !my_value.get().is_empty() {
set_optional_my_value(Some(my_value.get()));
} else {
set_optional_my_value(None);
}
});*/
// Do this
let my_optional_value =
move || (!my_value.with(String::is_empty)).then(|| Some(my_value.get()));
view! {
<input
prop:value=my_value
on:input= move |ev| set_my_value(event_target_value(&ev))
/>
<p>
<code>"my_optional_value"</code>
" is "
<code>
<Show
when=move || my_optional_value().is_some()
fallback=|| view! { "None" }
>
"Some(\"" {my_optional_value().unwrap()} "\")"
</Show>
</code>
</p>
}
}
/*#[component]
pub fn Show<F, W, IV>(
/// The scope the component is running in
/// The components Show wraps
children: Box<dyn Fn() -> Fragment>,
/// A closure that returns a bool that determines whether this thing runs
when: W,
/// A closure that returns what gets rendered if the when statement is false
fallback: F,
) -> impl IntoView
where
W: Fn() -> bool + 'static,
F: Fn() -> IV + 'static,
IV: IntoView,
{
let memoized_when = create_memo(move |_| when());
move || match memoized_when.get() {
true => children().into_view(),
false => fallback().into_view(),
}
}*/
fn log(std::fmt::Display) {
let log = use_context::<RwSignal<Vec<String>>>().unwrap();
log.update(|log| log.push(msg.to_string()));
}
fn main() {
leptos::mount_to_body(|| view! { <App/> })
}
```
</details>
</preview>

View File

@@ -6,7 +6,7 @@ application. It sometimes looks a little silly:
```rust
// a signal holds a value, and can be updated
let (count, set_count) = create_signal(cx, 0);
let (count, set_count) = create_signal(0);
// a derived signal is a function that accesses other signals
let double_count = move || count() * 2;
@@ -19,11 +19,11 @@ let text = move || if count_is_odd() {
// an effect automatically tracks the signals it depends on
// and reruns when they change
create_effect(cx, move |_| {
log!("text = {}", text());
create_effect(move |_| {
logging::log!("text = {}", text());
});
view! { cx,
view! {
<p>{move || text().to_uppercase()}</p>
}
```
@@ -53,12 +53,12 @@ Take our typical `<SimpleCounter/>` example in its simplest form:
```rust
#[component]
pub fn SimpleCounter(cx: Scope) -> impl IntoView {
let (value, set_value) = create_signal(cx, 0);
pub fn SimpleCounter() -> impl IntoView {
let (value, set_value) = create_signal(0);
let increment = move |_| set_value.update(|value| *value += 1);
view! { cx,
view! {
<button on:click=increment>
{value}
</button>
@@ -68,7 +68,7 @@ pub fn SimpleCounter(cx: Scope) -> impl IntoView {
The `SimpleCounter` function itself runs once. The `value` signal is created once. The framework hands off the `increment` function to the browser as an event listener. When you click the button, the browser calls `increment`, which updates `value` via `set_value`. And that updates the single text node represented in our view by `{value}`.
Closures are key to reactivity. They provide the framework with the ability to rerun the smallest possible unit of your application in responsive to a change.
Closures are key to reactivity. They provide the framework with the ability to rerun the smallest possible unit of your application in response to a change.
So remember two things:

View File

@@ -14,17 +14,17 @@ There are four basic signal operations:
Calling a `ReadSignal` as a function is syntax sugar for `.get()`. Calling a `WriteSignal` as a function is syntax sugar for `.set()`. So
```rust
let (count, set_count) = create_signal(cx, 0);
let (count, set_count) = create_signal(0);
set_count(1);
log!(count());
logging::log!(count());
```
is the same as
```rust
let (count, set_count) = create_signal(cx, 0);
let (count, set_count) = create_signal(0);
set_count.set(1);
log!(count.get());
logging::log!(count.get());
```
You might notice that `.get()` and `.set()` can be implemented in terms of `.with()` and `.update()`. In other words, `count.get()` is identical with `count.with(|n| n.clone())`, and `count.set(1)` is implemented by doing `count.update(|n| *n = 1)`.
@@ -36,7 +36,7 @@ However, there are some very good use cases for `.with()` and `.update()`.
For example, consider a signal that holds a `Vec<String>`.
```rust
let (names, set_names) = create_signal(cx, Vec::new());
let (names, set_names) = create_signal(Vec::new());
if names().is_empty() {
set_names(vec!["Alice".to_string()]);
}
@@ -47,7 +47,7 @@ In terms of logic, this is simple enough, but its hiding some significant ine
Likewise, `set_names` replaces the value with a whole new `Vec<_>`. This is fine, but we might as well just mutate the original `Vec<_>` in place.
```rust
let (names, set_names) = create_signal(cx, Vec::new());
let (names, set_names) = create_signal(Vec::new());
if names.with(|names| names.is_empty()) {
set_names.update(|names| names.push("Alice".to_string()));
}
@@ -63,40 +63,46 @@ if names.with(Vec::is_empty) {
}
```
After all, `.with()` simply takes a function that takes the value by reference. Since `Vec::is_empty` takes `&self`, we can pass it in directly and avoid the unncessary closure.
After all, `.with()` simply takes a function that takes the value by reference. Since `Vec::is_empty` takes `&self`, we can pass it in directly and avoid the unnecessary closure.
## Making signals depend on each other
Often people ask about situations in which some signal needs to change based on some other signals value. There are three good ways to do this, and one thats less than ideal but okay under controlled circumstances.
### Good Options
**1) B is a function of A.** Create a signal for A and a derived signal or memo for B.
```rust
let (count, set_count) = create_signal(cx, 1);
let (count, set_count) = create_signal(1);
let derived_signal_double_count = move || count() * 2;
let memoized_double_count = create_memo(cx, move |_| count() * 2);
let memoized_double_count = create_memo(move |_| count() * 2);
```
> For guidance on whether to use a derived signal or a memo, see the docs for [`create_memo`](https://docs.rs/leptos/latest/leptos/fn.create_memo.html)
>
**2) C is a function of A and some other thing B.** Create signals for A and B and a derived signal or memo for C.
>
> **2) C is a function of A and some other thing B.** Create signals for A and B and a derived signal or memo for C.
```rust
let (first_name, set_first_name) = create_signal(cx, "Bridget".to_string());
let (last_name, set_last_name) = create_signal(cx, "Jones".to_string());
let (first_name, set_first_name) = create_signal("Bridget".to_string());
let (last_name, set_last_name) = create_signal("Jones".to_string());
let full_name = move || format!("{} {}", first_name(), last_name());
```
**3) A and B are independent signals, but sometimes updated at the same time.** When you make the call to update A, make a separate call to update B.
```rust
let (age, set_age) = create_signal(cx, 32);
let (favorite_number, set_favorite_number) = create_signal(cx, 42);
let (age, set_age) = create_signal(32);
let (favorite_number, set_favorite_number) = create_signal(42);
// use this to handle a click on a `Clear` button
let clear_handler = move |_| {
set_age(0);
set_favorite_number(0);
};
```
### If you really must...
**4) Create an effect to write to B whenever A changes.** This is officially discouraged, for several reasons:
a) It will always be less efficient, as it means every time A updates you do two full trips through the reactive process. (You set A, which causes the effect to run, as well as any other effects that depend on A. Then you set B, which causes any effects that depend on B to run.)
b) It increases your chances of accidentally creating things like infinite loops or over-re-running effects. This is the kind of ping-ponging, reactive spaghetti code that was common in the early 2010s and that we try to avoid with things like read-write segregation and discouraging writing to signals from effects.

View File

@@ -24,7 +24,7 @@ use leptos_router::*;
Routing behavior is provided by the [`<Router/>`](https://docs.rs/leptos_router/latest/leptos_router/fn.Router.html) component. This should usually be somewhere near the root of your application, the rest of the app.
> You shouldnt try to use multiple `<Router/>`s in your app. Remember that the router drives global state: if you have multiple routers, which ones decides what to do when the URL changes?
> You shouldnt try to use multiple `<Router/>`s in your app. Remember that the router drives global state: if you have multiple routers, which one decides what to do when the URL changes?
Lets start with a simple `<App/>` component using the router:
@@ -33,8 +33,8 @@ use leptos::*;
use leptos_router::*;
#[component]
pub fn App(cx: Scope) -> impl IntoView {
view! { cx,
pub fn App() -> impl IntoView {
view! {
<Router>
<nav>
/* ... */
@@ -58,8 +58,8 @@ use leptos::*;
use leptos_router::*;
#[component]
pub fn App(cx: Scope) -> impl IntoView {
view! { cx,
pub fn App() -> impl IntoView {
view! {
<Router>
<nav>
/* ... */
@@ -83,19 +83,21 @@ The `path` can include
- dynamic, named parameters beginning with a colon (`/:id`),
- and/or a wildcard beginning with an asterisk (`/user/*any`)
The `view` is a function that takes a `Scope` and returns a view.
The `view` is a function that returns a view. Any component with no props works here, as does a closure that returns some view.
```rust
<Routes>
<Route path="/" view=|cx| view! { cx, <Home/> }/>
<Route path="/users" view=|cx| view! { cx, <Users/> }/>
<Route path="/users/:id" view=|cx| view! { cx, <UserProfile/> }/>
<Route path="/*any" view=|cx| view! { cx, <NotFound/> }/>
<Route path="/" view=Home/>
<Route path="/users" view=Users/>
<Route path="/users/:id" view=UserProfile/>
<Route path="/*any" view=|| view! { <h1>"Not Found"</h1> }/>
</Routes>
```
> The router scores each route to see how good a match it is, so you can define your routes in any order.
> `view` takes a `Fn() -> impl IntoView`. If a component has no props, it can be passed directly into the `view`. In this case, `view=Home` is just a shorthand for `|| view! { <Home/> }`.
Now if you navigate to `/` or to `/users` youll get the home page or the `<Users/>`. If you go to `/users/3` or `/blahblah` youll get a user profile or your 404 page (`<NotFound/>`). On every navigation, the router determines which `<Route/>` should be matched, and therefore what content should be displayed where the `<Routes/>` component is defined.
Note that you can define your routes in any order. The router scores each route to see how good a match it is, rather than simply trying to match them top to bottom.
Simple enough?

View File

@@ -4,10 +4,10 @@ We just defined the following set of routes:
```rust
<Routes>
<Route path="/" view=|cx| view! { cx, <Home /> }/>
<Route path="/users" view=|cx| view! { cx, <Users /> }/>
<Route path="/users/:id" view=|cx| view! { cx, <UserProfile /> }/>
<Route path="/*any" view=|cx| view! { cx, <NotFound /> }/>
<Route path="/" view=Home/>
<Route path="/users" view=Users/>
<Route path="/users/:id" view=UserProfile/>
<Route path="/*any" view=NotFound/>
</Routes>
```
@@ -17,11 +17,11 @@ Well... you can!
```rust
<Routes>
<Route path="/" view=|cx| view! { cx, <Home /> }/>
<Route path="/users" view=|cx| view! { cx, <Users /> }>
<Route path=":id" view=|cx| view! { cx, <UserProfile /> }/>
<Route path="/" view=Home/>
<Route path="/users" view=Users>
<Route path=":id" view=UserProfile/>
</Route>
<Route path="/*any" view=|cx| view! { cx, <NotFound /> }/>
<Route path="/*any" view=NotFound/>
</Routes>
```
@@ -39,8 +39,8 @@ Lets look back at our practical example.
```rust
<Routes>
<Route path="/users" view=|cx| view! { cx, <Users /> }/>
<Route path="/users/:id" view=|cx| view! { cx, <UserProfile /> }/>
<Route path="/users" view=Users/>
<Route path="/users/:id" view=UserProfile/>
</Routes>
```
@@ -53,8 +53,8 @@ Lets say I use nested routes instead:
```rust
<Routes>
<Route path="/users" view=|cx| view! { cx, <Users /> }>
<Route path=":id" view=|cx| view! { cx, <UserProfile /> }/>
<Route path="/users" view=Users>
<Route path=":id" view=UserProfile/>
</Route>
</Routes>
```
@@ -68,9 +68,9 @@ I actually need to add a fallback route
```rust
<Routes>
<Route path="/users" view=|cx| view! { cx, <Users /> }>
<Route path=":id" view=|cx| view! { cx, <UserProfile /> }/>
<Route path="" view=|cx| view! { cx, <NoUser /> }/>
<Route path="/users" view=Users>
<Route path=":id" view=UserProfile/>
<Route path="" view=NoUser/>
</Route>
</Routes>
```
@@ -94,9 +94,9 @@ You can easily define this with nested routes
```rust
<Routes>
<Route path="/contacts" view=|cx| view! { cx, <ContactList/> }>
<Route path=":id" view=|cx| view! { cx, <ContactInfo/> }/>
<Route path="" view=|cx| view! { cx,
<Route path="/contacts" view=ContactList>
<Route path=":id" view=ContactInfo/>
<Route path="" view=|| view! {
<p>"Select a contact to view more info."</p>
}/>
</Route>
@@ -107,13 +107,13 @@ You can go even deeper. Say you want to have tabs for each contacts address,
```rust
<Routes>
<Route path="/contacts" view=|cx| view! { cx, <ContactList/> }>
<Route path=":id" view=|cx| view! { cx, <ContactInfo/> }>
<Route path="" view=|cx| view! { cx, <EmailAndPhone/> }/>
<Route path="address" view=|cx| view! { cx, <Address/> }/>
<Route path="messages" view=|cx| view! { cx, <Messages/> }/>
<Route path="/contacts" view=ContactList>
<Route path=":id" view=ContactInfo>
<Route path="" view=EmailAndPhone/>
<Route path="address" view=Address/>
<Route path="messages" view=Messages/>
</Route>
<Route path="" view=|cx| view! { cx,
<Route path="" view=|| view! {
<p>"Select a contact to view more info."</p>
}/>
</Route>
@@ -124,7 +124,7 @@ You can go even deeper. Say you want to have tabs for each contacts address,
## `<Outlet/>`
Parent routes do not automatically render their nested routes. After all, they are just components; they dont know exactly where they should render their children, and “just stick at at the end of the parent component” is not a great answer.
Parent routes do not automatically render their nested routes. After all, they are just components; they dont know exactly where they should render their children, and “just stick it at the end of the parent component” is not a great answer.
Instead, you tell a parent component where to render any nested components with an `<Outlet/>` component. The `<Outlet/>` simply renders one of two things:
@@ -135,15 +135,15 @@ Thats all! But its important to know and to remember, because its a com
```rust
#[component]
pub fn ContactList(cx: Scope) -> impl IntoView {
pub fn ContactList() -> impl IntoView {
let contacts = todo!();
view! { cx,
view! {
<div style="display: flex">
// the contact list
<For each=contacts
key=|contact| contact.id
view=|cx, contact| todo!()
view=|contact| todo!()
>
// the nested child, if any
// dont forget this!
@@ -170,3 +170,119 @@ In fact, in this case, we dont even need to rerender the `<Contact/>` compone
[Click to open CodeSandbox.](https://codesandbox.io/p/sandbox/16-router-fy4tjv?file=%2Fsrc%2Fmain.rs&selection=%5B%7B%22endColumn%22%3A1%2C%22endLineNumber%22%3A3%2C%22startColumn%22%3A1%2C%22startLineNumber%22%3A3%7D%5D)
<iframe src="https://codesandbox.io/p/sandbox/16-router-fy4tjv?file=%2Fsrc%2Fmain.rs&selection=%5B%7B%22endColumn%22%3A1%2C%22endLineNumber%22%3A3%2C%22startColumn%22%3A1%2C%22startLineNumber%22%3A3%7D%5D" width="100%" height="1000px" style="max-height: 100vh"></iframe>
<details>
<summary>CodeSandbox Source</summary>
```rust
use leptos::*;
use leptos_router::*;
#[component]
fn App() -> impl IntoView {
view! {
<Router>
<h1>"Contact App"</h1>
// this <nav> will show on every routes,
// because it's outside the <Routes/>
// note: we can just use normal <a> tags
// and the router will use client-side navigation
<nav>
<h2>"Navigation"</h2>
<a href="/">"Home"</a>
<a href="/contacts">"Contacts"</a>
</nav>
<main>
<Routes>
// / just has an un-nested "Home"
<Route path="/" view=|| view! {
<h3>"Home"</h3>
}/>
// /contacts has nested routes
<Route
path="/contacts"
view=ContactList
>
// if no id specified, fall back
<Route path=":id" view=ContactInfo>
<Route path="" view=|| view! {
<div class="tab">
"(Contact Info)"
</div>
}/>
<Route path="conversations" view=|| view! {
<div class="tab">
"(Conversations)"
</div>
}/>
</Route>
// if no id specified, fall back
<Route path="" view=|| view! {
<div class="select-user">
"Select a user to view contact info."
</div>
}/>
</Route>
</Routes>
</main>
</Router>
}
}
#[component]
fn ContactList() -> impl IntoView {
view! {
<div class="contact-list">
// here's our contact list component itself
<div class="contact-list-contacts">
<h3>"Contacts"</h3>
<A href="alice">"Alice"</A>
<A href="bob">"Bob"</A>
<A href="steve">"Steve"</A>
</div>
// <Outlet/> will show the nested child route
// we can position this outlet wherever we want
// within the layout
<Outlet/>
</div>
}
}
#[component]
fn ContactInfo() -> impl IntoView {
// we can access the :id param reactively with `use_params_map`
let params = use_params_map();
let id = move || params.with(|params| params.get("id").cloned().unwrap_or_default());
// imagine we're loading data from an API here
let name = move || match id().as_str() {
"alice" => "Alice",
"bob" => "Bob",
"steve" => "Steve",
_ => "User not found.",
};
view! {
<div class="contact-info">
<h4>{name}</h4>
<div class="tabs">
<A href="" exact=true>"Contact Info"</A>
<A href="conversations">"Conversations"</A>
</div>
// <Outlet/> here is the tabs that are nested
// underneath the /contacts/:id route
<Outlet/>
</div>
}
}
fn main() {
leptos::mount_to_body(|| view! { <App/> })
}
```
</details>
</preview>

View File

@@ -36,14 +36,22 @@ struct ContactSearch {
```
> Note: The `Params` derive macro is located at `leptos::Params`, and the `Params` trait is at `leptos_router::Params`. If you avoid using glob imports like `use leptos::*;`, make sure youre importing the right one for the derive macro.
>
> If you are not using the `nightly` feature, you will get the error
>
> ```
> no function or associated item named `into_param` found for struct `std::string::String` in the current scope
> ```
>
> At the moment, supporting both `T: FromStr` and `Option<T>` for typed params requires a nightly feature. You can fix this by simply changing the struct to use `q: Option<String>` instead of `q: String`.
Now we can use them in a component. Imagine a URL that has both params and a query, like `/contacts/:id?q=Search`.
The typed versions return `Memo<Result<T, _>>`. Its a Memo so it reacts to changes in the URL. Its a `Result` because the params or query need to be parsed from the URL, and may or may not be valid.
```rust
let params = use_params::<ContactParams>(cx);
let query = use_query::<ContactSearch>(cx);
let params = use_params::<ContactParams>();
let query = use_query::<ContactSearch>();
// id: || -> usize
let id = move || {
@@ -58,8 +66,8 @@ let id = move || {
The untyped versions return `Memo<ParamsMap>`. Again, its memo to react to changes in the URL. [`ParamsMap`](https://docs.rs/leptos_router/0.2.3/leptos_router/struct.ParamsMap.html) behaves a lot like any other map type, with a `.get()` method that returns `Option<&String>`.
```rust
let params = use_params_map(cx);
let query = use_query_map(cx);
let params = use_params_map();
let query = use_query_map();
// id: || -> Option<String>
let id = move || {
@@ -70,10 +78,126 @@ let id = move || {
This can get a little messy: deriving a signal that wraps an `Option<_>` or `Result<_>` can involve a couple steps. But its worth doing this for two reasons:
1. Its correct, i.e., it forces you to consider the cases, “What if the user doesnt pass a value for this query field? What if they pass an invalid value?”
2. Its performant. Specifically, when you navigate between different paths that match the same `<Route/>` with only params or the query changing, you can get fine-grained updates to different parts of your app without rerendering. For example, navigating between different contacts in our contact-list example does a targeted update to the name field (and eventually contact info) without needing to replacing or rerender the wrapping `<Contact/>`. This is what fine-grained reactivity is for.
2. Its performant. Specifically, when you navigate between different paths that match the same `<Route/>` with only params or the query changing, you can get fine-grained updates to different parts of your app without rerendering. For example, navigating between different contacts in our contact-list example does a targeted update to the name field (and eventually contact info) without needing to replace or rerender the wrapping `<Contact/>`. This is what fine-grained reactivity is for.
> This is the same example from the previous section. The router is such an integrated system that it makes sense to provide a single example highlighting multiple features, even if we havent explain them all yet.
> This is the same example from the previous section. The router is such an integrated system that it makes sense to provide a single example highlighting multiple features, even if we havent explained them all yet.
[Click to open CodeSandbox.](https://codesandbox.io/p/sandbox/16-router-fy4tjv?file=%2Fsrc%2Fmain.rs&selection=%5B%7B%22endColumn%22%3A1%2C%22endLineNumber%22%3A3%2C%22startColumn%22%3A1%2C%22startLineNumber%22%3A3%7D%5D)
<iframe src="https://codesandbox.io/p/sandbox/16-router-fy4tjv?file=%2Fsrc%2Fmain.rs&selection=%5B%7B%22endColumn%22%3A1%2C%22endLineNumber%22%3A3%2C%22startColumn%22%3A1%2C%22startLineNumber%22%3A3%7D%5D" width="100%" height="1000px" style="max-height: 100vh"></iframe>
<details>
<summary>CodeSandbox Source</summary>
```rust
use leptos::*;
use leptos_router::*;
#[component]
fn App() -> impl IntoView {
view! {
<Router>
<h1>"Contact App"</h1>
// this <nav> will show on every routes,
// because it's outside the <Routes/>
// note: we can just use normal <a> tags
// and the router will use client-side navigation
<nav>
<h2>"Navigation"</h2>
<a href="/">"Home"</a>
<a href="/contacts">"Contacts"</a>
</nav>
<main>
<Routes>
// / just has an un-nested "Home"
<Route path="/" view=|| view! {
<h3>"Home"</h3>
}/>
// /contacts has nested routes
<Route
path="/contacts"
view=ContactList
>
// if no id specified, fall back
<Route path=":id" view=ContactInfo>
<Route path="" view=|| view! {
<div class="tab">
"(Contact Info)"
</div>
}/>
<Route path="conversations" view=|| view! {
<div class="tab">
"(Conversations)"
</div>
}/>
</Route>
// if no id specified, fall back
<Route path="" view=|| view! {
<div class="select-user">
"Select a user to view contact info."
</div>
}/>
</Route>
</Routes>
</main>
</Router>
}
}
#[component]
fn ContactList() -> impl IntoView {
view! {
<div class="contact-list">
// here's our contact list component itself
<div class="contact-list-contacts">
<h3>"Contacts"</h3>
<A href="alice">"Alice"</A>
<A href="bob">"Bob"</A>
<A href="steve">"Steve"</A>
</div>
// <Outlet/> will show the nested child route
// we can position this outlet wherever we want
// within the layout
<Outlet/>
</div>
}
}
#[component]
fn ContactInfo() -> impl IntoView {
// we can access the :id param reactively with `use_params_map`
let params = use_params_map();
let id = move || params.with(|params| params.get("id").cloned().unwrap_or_default());
// imagine we're loading data from an API here
let name = move || match id().as_str() {
"alice" => "Alice",
"bob" => "Bob",
"steve" => "Steve",
_ => "User not found.",
};
view! {
<div class="contact-info">
<h4>{name}</h4>
<div class="tabs">
<A href="" exact=true>"Contact Info"</A>
<A href="conversations">"Conversations"</A>
</div>
// <Outlet/> here is the tabs that are nested
// underneath the /contacts/:id route
<Outlet/>
</div>
}
}
fn main() {
leptos::mount_to_body(|| view! { <App/> })
}
```
</details>
</preview>

View File

@@ -11,13 +11,146 @@ The router will bail out of handling an `<a>` click under a number of situations
In other words, the router will only try to do a client-side navigation when its pretty sure it can handle it, and it will upgrade every `<a>` element to get this special behavior.
> This also means that if you need to opt out of client-side routing, you can do so easily. For example, if you have a link to another page on the same domain, but which isnt part of your Leptos app, you can just use `<a rel="external">` to tell the router it isnt something it can handle.
The router also provides an [`<A>`](https://docs.rs/leptos_router/latest/leptos_router/fn.A.html) component, which does two additional things:
1. Correctly resolves relative nested routes. Relative routing with ordinary `<a>` tags can be tricky. For example, if you have a route like `/post/:id`, `<A href="1">` will generate the correct relative route, but `<a href="1">` likely will not (depending on where it appears in your view.) `<A/>` resolves routes relative to the path of the nested route within which it appears.
2. Sets the `aria-current` attribute to `page` if this link is the active link (i.e., its a link to the page youre on). This is helpful for accessibility and for styling. For example, if you want to set the link a different color if its a link to the page youre currently on, you can match this attribute with a CSS selector.
## Navigating Programmatically
Your most-used methods of navigating between pages should be with `<a>` and `<form>` elements or with the enhanced `<A/>` and `<Form/>` components. Using links and forms to navigate is the best solution for accessibility and graceful degradation.
On occasion, though, youll want to navigate programmatically, i.e., call a function that can navigate to a new page. In that case, you should use the [`use_navigate`](https://docs.rs/leptos_router/latest/leptos_router/fn.use_navigate.html) function.
```rust
let navigate = leptos_router::use_navigate();
navigate("/somewhere", Default::default());
```
> You should almost never do something like `<button on:click=move |_| navigate(/* ... */)>`. Any `on:click` that navigates should be an `<a>`, for reasons of accessibility.
The second argument here is a set of [`NavigateOptions`](https://docs.rs/leptos_router/latest/leptos_router/struct.NavigateOptions.html), which includes options to resolve the navigation relative to the current route as the `<A/>` component does, replace it in the navigation stack, include some navigation state, and maintain the current scroll state on navigation.
> Once again, this is the same example. Check out the relative `<A/>` components, and take a look at the CSS in `index.html` to see the ARIA-based styling.
[Click to open CodeSandbox.](https://codesandbox.io/p/sandbox/16-router-fy4tjv?file=%2Fsrc%2Fmain.rs&selection=%5B%7B%22endColumn%22%3A1%2C%22endLineNumber%22%3A3%2C%22startColumn%22%3A1%2C%22startLineNumber%22%3A3%7D%5D)
<iframe src="https://codesandbox.io/p/sandbox/16-router-fy4tjv?file=%2Fsrc%2Fmain.rs&selection=%5B%7B%22endColumn%22%3A1%2C%22endLineNumber%22%3A3%2C%22startColumn%22%3A1%2C%22startLineNumber%22%3A3%7D%5D" width="100%" height="1000px" style="max-height: 100vh"></iframe>
<details>
<summary>CodeSandbox Source</summary>
```rust
use leptos::*;
use leptos_router::*;
#[component]
fn App() -> impl IntoView {
view! {
<Router>
<h1>"Contact App"</h1>
// this <nav> will show on every routes,
// because it's outside the <Routes/>
// note: we can just use normal <a> tags
// and the router will use client-side navigation
<nav>
<h2>"Navigation"</h2>
<a href="/">"Home"</a>
<a href="/contacts">"Contacts"</a>
</nav>
<main>
<Routes>
// / just has an un-nested "Home"
<Route path="/" view=|| view! {
<h3>"Home"</h3>
}/>
// /contacts has nested routes
<Route
path="/contacts"
view=ContactList
>
// if no id specified, fall back
<Route path=":id" view=ContactInfo>
<Route path="" view=|| view! {
<div class="tab">
"(Contact Info)"
</div>
}/>
<Route path="conversations" view=|| view! {
<div class="tab">
"(Conversations)"
</div>
}/>
</Route>
// if no id specified, fall back
<Route path="" view=|| view! {
<div class="select-user">
"Select a user to view contact info."
</div>
}/>
</Route>
</Routes>
</main>
</Router>
}
}
#[component]
fn ContactList() -> impl IntoView {
view! {
<div class="contact-list">
// here's our contact list component itself
<div class="contact-list-contacts">
<h3>"Contacts"</h3>
<A href="alice">"Alice"</A>
<A href="bob">"Bob"</A>
<A href="steve">"Steve"</A>
</div>
// <Outlet/> will show the nested child route
// we can position this outlet wherever we want
// within the layout
<Outlet/>
</div>
}
}
#[component]
fn ContactInfo() -> impl IntoView {
// we can access the :id param reactively with `use_params_map`
let params = use_params_map();
let id = move || params.with(|params| params.get("id").cloned().unwrap_or_default());
// imagine we're loading data from an API here
let name = move || match id().as_str() {
"alice" => "Alice",
"bob" => "Bob",
"steve" => "Steve",
_ => "User not found.",
};
view! {
<div class="contact-info">
<h4>{name}</h4>
<div class="tabs">
<A href="" exact=true>"Contact Info"</A>
<A href="conversations">"Conversations"</A>
</div>
// <Outlet/> here is the tabs that are nested
// underneath the /contacts/:id route
<Outlet/>
</div>
}
}
fn main() {
leptos::mount_to_body(|| view! { <App/> })
}
```
</details>
</preview>

View File

@@ -1,12 +1,12 @@
# The `<Form/>` Component
Links and forms sometimes seem completely unrelated. But in fact, they work in very similar ways.
Links and forms sometimes seem completely unrelated. But, in fact, they work in very similar ways.
In plain HTML, there are three ways to navigate to another page:
1. An `<a>` element that links to another page. Navigates to the URL in its `href` attribute with the `GET` HTTP method.
2. A `<form method="GET">`. Navigates to the URL in its `action` attribute with the `GET` HTTP method and the form data from its inputs encoded in the URL query string.
3. A `<form method="POST">`. Navigates to the URL in its `action` attribute with the `POST` HTTP method and the form data from its inputs encoded in the body of the request.
1. An `<a>` element that links to another page: Navigates to the URL in its `href` attribute with the `GET` HTTP method.
2. A `<form method="GET">`: Navigates to the URL in its `action` attribute with the `GET` HTTP method and the form data from its inputs encoded in the URL query string.
3. A `<form method="POST">`: Navigates to the URL in its `action` attribute with the `POST` HTTP method and the form data from its inputs encoded in the body of the request.
Since we have a client-side router, we can do client-side link navigations without reloading the page, i.e., without a full round-trip to the server and back. It makes sense that we can do client-side form navigations in the same way.
@@ -24,15 +24,15 @@ async fn fetch_results() {
}
#[component]
pub fn FormExample(cx: Scope) -> impl IntoView {
pub fn FormExample() -> impl IntoView {
// reactive access to URL query strings
let query = use_query_map(cx);
let query = use_query_map();
// search stored as ?q=
let search = move || query().get("q").cloned().unwrap_or_default();
// a resource driven by the search string
let search_results = create_resource(cx, search, fetch_results);
let search_results = create_resource(search, fetch_results);
view! { cx,
view! {
<Form method="GET" action="">
<input type="search" name="search" value=search/>
<input type="submit"/>
@@ -51,7 +51,7 @@ This is a great pattern. The data flow is extremely clear: all data flows from t
We can actually take it a step further and do something kind of clever:
```rust
view! { cx,
view! {
<Form method="GET" action="">
<input type="search" name="search" value=search
oninput="this.form.requestSubmit()"
@@ -65,3 +65,117 @@ Youll notice that this version drops the `Submit` button. Instead, we add an
[Click to open CodeSandbox.](https://codesandbox.io/p/sandbox/16-router-forked-hrrt3h?file=%2Fsrc%2Fmain.rs)
<iframe src="https://codesandbox.io/p/sandbox/16-router-forked-hrrt3h?file=%2Fsrc%2Fmain.rs" width="100%" height="1000px" style="max-height: 100vh"></iframe>
<details>
<summary>CodeSandbox Source</summary>
```rust
use leptos::*;
use leptos_router::*;
#[component]
fn App() -> impl IntoView {
view! {
<Router>
<h1><code>"<Form/>"</code></h1>
<main>
<Routes>
<Route path="" view=FormExample/>
</Routes>
</main>
</Router>
}
}
#[component]
pub fn FormExample() -> impl IntoView {
// reactive access to URL query
let query = use_query_map();
let name = move || query().get("name").cloned().unwrap_or_default();
let number = move || query().get("number").cloned().unwrap_or_default();
let select = move || query().get("select").cloned().unwrap_or_default();
view! {
// read out the URL query strings
<table>
<tr>
<td><code>"name"</code></td>
<td>{name}</td>
</tr>
<tr>
<td><code>"number"</code></td>
<td>{number}</td>
</tr>
<tr>
<td><code>"select"</code></td>
<td>{select}</td>
</tr>
</table>
// <Form/> will navigate whenever submitted
<h2>"Manual Submission"</h2>
<Form method="GET" action="">
// input names determine query string key
<input type="text" name="name" value=name/>
<input type="number" name="number" value=number/>
<select name="select">
// `selected` will set which starts as selected
<option selected=move || select() == "A">
"A"
</option>
<option selected=move || select() == "B">
"B"
</option>
<option selected=move || select() == "C">
"C"
</option>
</select>
// submitting should cause a client-side
// navigation, not a full reload
<input type="submit"/>
</Form>
// This <Form/> uses some JavaScript to submit
// on every input
<h2>"Automatic Submission"</h2>
<Form method="GET" action="">
<input
type="text"
name="name"
value=name
// this oninput attribute will cause the
// form to submit on every input to the field
oninput="this.form.requestSubmit()"
/>
<input
type="number"
name="number"
value=number
oninput="this.form.requestSubmit()"
/>
<select name="select"
onchange="this.form.requestSubmit()"
>
<option selected=move || select() == "A">
"A"
</option>
<option selected=move || select() == "B">
"B"
</option>
<option selected=move || select() == "C">
"C"
</option>
</select>
// submitting should cause a client-side
// navigation, not a full reload
<input type="submit"/>
</Form>
}
}
fn main() {
leptos::mount_to_body(|| view! { <App/> })
}
```
</details>
</preview>

View File

@@ -31,9 +31,8 @@ pub async fn add_todo(title: String) -> Result<(), ServerFnError> {
}
#[component]
pub fn BusyButton(cx: Scope) -> impl IntoView {
pub fn BusyButton() -> impl IntoView {
view! {
cx,
<button on:click=move |_| {
spawn_local(async {
add_todo("So much to do!".to_string()).await;
@@ -70,6 +69,18 @@ There are a few things to note about the way you define a server function, too.
- We provide the macro a path. This is a prefix for the path at which well mount a server function handler on our server. (See examples for [Actix](https://github.com/leptos-rs/leptos/blob/main/examples/todo_app_sqlite/src/main.rs#L44) and [Axum](https://github.com/leptos-rs/leptos/blob/598523cd9d0d775b017cb721e41ebae9349f01e2/examples/todo_app_sqlite_axum/src/main.rs#L51).)
- Youll need to have `serde` as a dependency with the `derive` featured enabled for the macro to work properly. You can easily add it to `Cargo.toml` with `cargo add serde --features=derive`.
## Server Function URL Prefixes
You can optionally define a specific URL prefix to be used in the definition of the server function.
This is done by providing an optional 2nd argument to the `#[server]` macro.
By default the URL prefix will be `/api`, if not specified.
Here are some examples:
```rust
#[server(AddTodo)] // will use the default URL prefix of `/api`
#[server(AddTodo, "/foo")] // will use the URL prefix of `/foo`
```
## Server Function Encodings
By default, the server function call is a `POST` request that serializes the arguments as URL-encoded form data in the body of the request. (This means that server functions can be called from HTML forms, which well see in a future chapter.) But there are a few other methods supported. Optionally, we can provide another argument to the `#[server]` macro to specify an alternate encoding:
@@ -100,11 +111,26 @@ In other words, you have two choices:
> **Why not `PUT` or `DELETE`? Why URL/form encoding, and not JSON?**
>
> These are reasonable questions. Much of the web is built on REST API patterns that encourage the use of semantic HTTP methods like `DELETE` to delete an item from a database, and many devs are accustomed to sending data to APIs in the JSON format.
>
>
> The reason we use `POST` or `GET` with URL-encoded data by default is the `<form>` support. For better or for worse, HTML forms dont support `PUT` or `DELETE`, and they dont support sending JSON. This means that if you use anything but a `GET` or `POST` request with URL-encoded data, it can only work once WASM has loaded. As well see [in a later chapter](../progressive_enhancement), this isnt always a great idea.
>
>
> The CBOR encoding is suported for historical reasons; an earlier version of server functions used a URL encoding that didnt support nested objects like structs or vectors as server function arguments, which CBOR did. But note that the CBOR forms encounter the same issue as `PUT`, `DELETE`, or JSON: they do not degrade gracefully if the WASM version of your app is not available.
## Server Functions Endpoint Paths
By default, a unique path will be generated. You can optionally define a specific endpoint path to be used in the URL. This is done by providing an optional 4th argument to the `#[server]` macro. Leptos will generate the complete path by concatenating the URL prefix (2nd argument) and the endpoint path (4th argument).
For example,
```rust
#[server(MyServerFnType, "/api", "Url", "hello")]
```
will generate a server function endpoint at `/api/hello` that accepts a POST request.
> **Can I use the same server function endpoint path with multiple encodings?**
>
> No. Different server functions must have unique paths. The `#[server]` macro automatically generates unique paths, but you need to be careful if you choose to specify the complete path manually, as the server looks up server functions by their path.
## An Important Note on Security
Server functions are a cool technology, but its very important to remember. **Server functions are not magic; theyre syntax sugar for defining a public API.** The _body_ of a server function is never made public; its just part of your server binary. But the server function is a publicly accessible API endpoint, and its return value is just a JSON or similar blob. You should _never_ return something sensitive from a server function.
@@ -113,7 +139,7 @@ Server functions are a cool technology, but its very important to remember. *
So far, everything Ive said is actually framework agnostic. (And in fact, the Leptos server function crate has been integrated into Dioxus as well!) Server functions are simply a way of defining a function-like RPC call that leans on Web standards like HTTP requests and URL encoding.
But in a way, they also provide the last missing primitive in our story so far. Because a server function is just a plain Rust async function, it integrates perfectly with the async Leptos primitives we discussed [earlier](../async/README.md). So you can easily integrate your server functions with the rest of your applications:
But in a way, they also provide the last missing primitive in our story so far. Because a server function is just a plain Rust async function, it integrates perfectly with the async Leptos primitives we discussed [earlier](https://leptos-rs.github.io/leptos/async/index.html). So you can easily integrate your server functions with the rest of your applications:
- Create **resources** that call the server function to load data from the server
- Read these resources under `<Suspense/>` or `<Transition/>` to enable streaming SSR and fallback states while data loads.

View File

@@ -6,9 +6,9 @@ The server functions we looked at in the last chapter showed how to run code on
We call Leptos a “full-stack” framework, but “full-stack” is always a misnomer (after all, it never means everything from the browser to your power company.) For us, “full stack” means that your Leptos app can run in the browser, and can run on the server, and can integrate the two, drawing together the unique features available in each; as weve seen in the book so far, a button click on the browser can drive a database read on the server, both written in the same Rust module. But Leptos itself doesnt provide the server (or the database, or the operating system, or the firmware, or the electrical cables...)
Instead, Leptos provides integrations for the two most popular Rust web server frameworks, Actix Web ([`leptos_actix`](https://docs.rs/leptos_actix/latest/leptos_actix/)) and Axum ([`leptos_axum`](https://docs.rs/leptos_actix/latest/leptos_axum/)). Weve built integrations with each servers router so that you can simply plug your Leptos app into an existing server with `.leptos_routes()`, and easily handle server function calls.
Instead, Leptos provides integrations for the two most popular Rust web server frameworks, Actix Web ([`leptos_actix`](https://docs.rs/leptos_actix/latest/leptos_actix/)) and Axum ([`leptos_axum`](https://docs.rs/leptos_axum/latest/leptos_axum/)). Weve built integrations with each servers router so that you can simply plug your Leptos app into an existing server with `.leptos_routes()`, and easily handle server function calls.
> If havent seen our [Actix](https://github.com/leptos-rs/start) and [Axum](https://github.com/leptos-rs/start-axum) templates, nows a good time to check them out.
> If you havent seen our [Actix](https://github.com/leptos-rs/start) and [Axum](https://github.com/leptos-rs/start-axum) templates, nows a good time to check them out.
## Using Extractors
@@ -23,12 +23,12 @@ The [`extract` function in `leptos_actix`](https://docs.rs/leptos_actix/latest/l
```rust
#[server(ActixExtract, "/api")]
pub async fn actix_extract(cx: Scope) -> Result<String, ServerFnError> {
pub async fn actix_extract() -> Result<String, ServerFnError> {
use leptos_actix::extract;
use actix_web::dev::ConnectionInfo;
use actix_web::web::{Data, Query};
extract(cx,
extract(
|search: Query<Search>, connection: ConnectionInfo| async move {
format!(
"search = {}\nconnection = {:?}",
@@ -43,15 +43,15 @@ pub async fn actix_extract(cx: Scope) -> Result<String, ServerFnError> {
## Axum Extractors
The syntax for the `leptos_axum::extract` function is very similar. (**Note**: This is available on the git main branch, but has not been released as of writing.) Note that Axum extractors return a `Result`, so youll need to add something to handle the error case.
The syntax for the [`leptos_axum::extract`](https://docs.rs/leptos_axum/latest/leptos_axum/fn.extract.html) function is very similar. (**Note**: This is available on the git main branch, but has not been released as of writing.) Note that Axum extractors return a `Result`, so youll need to add something to handle the error case.
```rust
#[server(AxumExtract, "/api")]
pub async fn axum_extract(cx: Scope) -> Result<String, ServerFnError> {
pub async fn axum_extract() -> Result<String, ServerFnError> {
use axum::{extract::Query, http::Method};
use leptos_axum::extract;
extract(cx, |method: Method, res: Query<MyQuery>| async move {
extract(|method: Method, res: Query<MyQuery>| async move {
format!("{method:?} and {}", res.q)
},
)
@@ -62,7 +62,21 @@ pub async fn axum_extract(cx: Scope) -> Result<String, ServerFnError> {
These are relatively simple examples accessing basic data from the server. But you can use extractors to access things like headers, cookies, database connection pools, and more, using the exact same `extract()` pattern.
> Note: For now, the Axum `extract` function only supports extractors for which the state is `()`, i.e., you can't yet use it to extract `State(_)`. You can access `State(_)` by using a custom handler that extracts the state and then provides it via context. [Click here for an example](https://github.com/leptos-rs/leptos/blob/a5f73b441c079f9138102b3a7d8d4828f045448c/examples/session_auth_axum/src/main.rs#L91-L92).
The Axum `extract` function only supports extractors for which the state is `()`. If you need an extractor that uses `State`, you should use [`extract_with_state`](https://docs.rs/leptos_axum/latest/leptos_axum/fn.extract_with_state.html). This requires you to provide the state. You can do this by extending the existing `LeptosOptions` state using the Axum `FromRef` pattern, which providing the state as context during render and server functions with custom handlers.
```rust
use axum::extract::FromRef;
/// Derive FromRef to allow multiple items in state, using Axums
/// SubStates pattern.
#[derive(FromRef, Debug, Clone)]
pub struct AppState{
pub leptos_options: LeptosOptions,
pub pool: SqlitePool
}
```
[Click here for an example of providing context in custom handlers](https://github.com/leptos-rs/leptos/blob/19ea6fae6aec2a493d79cc86612622d219e6eebb/examples/session_auth_axum/src/main.rs#L24-L44).
## A Note about Data-Loading Patterns

View File

@@ -8,12 +8,12 @@ Extractors provide an easy way to access request data inside server functions. L
```rust
#[server(TeaAndCookies)]
pub async fn tea_and_cookies(cx: Scope) -> Result<(), ServerFnError> {
pub async fn tea_and_cookies() -> Result<(), ServerFnError> {
use actix_web::{cookie::Cookie, http::header, http::header::HeaderValue};
use leptos_actix::ResponseOptions;
// pull ResponseOptions from context
let response = expect_context::<ResponseOptions>(cx);
let response = expect_context::<ResponseOptions>();
// set the HTTP status code
response.set_status(StatusCode::IM_A_TEAPOT);
@@ -35,14 +35,13 @@ Heres a simplified example from our [`session_auth_axum` example](https://git
```rust
#[server(Login, "/api")]
pub async fn login(
cx: Scope,
username: String,
password: String,
remember: Option<String>,
) -> Result<(), ServerFnError> {
// pull the DB pool and auth provider from context
let pool = pool(cx)?;
let auth = auth(cx)?;
let pool = pool()?;
let auth = auth()?;
// check whether the user exists
let user: User = User::get_from_username(username, &pool)
@@ -60,7 +59,7 @@ pub async fn login(
auth.remember_user(remember.is_some());
// and redirect to the home page
leptos_axum::redirect(cx, "/");
leptos_axum::redirect("/");
Ok(())
}
// if not, return an error

View File

@@ -8,7 +8,12 @@ If youve ever listened to streaming music or watched a video online, Im su
Let me say a little more about what I mean.
Leptos supports all four different of these different ways to render HTML that includes asynchronous data.
Leptos supports all four different modes of rendering HTML that includes asynchronous data:
1. [Synchronous Rendering](#synchronous-rendering)
1. [Async Rendering](#async-rendering)
1. [In-Order streaming](#in-order-streaming)
1. [Out-of-Order Streaming](#out-of-order-streaming)
## Synchronous Rendering
@@ -64,7 +69,7 @@ If youre using server-side rendering, the synchronous mode is almost never wh
5. **Partially-blocked streaming**: “Partially-blocked” streaming is useful when you have multiple separate `<Suspense/>` components on the page. If one of them reads from one or more “blocking resources” (see below), the fallback will not be sent; rather, the server will wait until that `<Suspense/>` has resolved and then replace the fallback with the resolved fragment on the server, which means that it is included in the initial HTML response and appears even if JavaScript is disabled or not supported. Other `<Suspense/>` stream in out of order as usual.
This is useful when you have multiple `<Suspense/>` on the page, and one is more important than the other: think of a blog post and comments, or product information and reviews. It is *not* useful if theres only one `<Suspense/>`, or if every `<Suspense/>` reads from blocking resources. In those cases it is a slower form of `async` rendering.
This is useful when you have multiple `<Suspense/>` on the page, and one is more important than the other: think of a blog post and comments, or product information and reviews. It is _not_ useful if theres only one `<Suspense/>`, or if every `<Suspense/>` reads from blocking resources. In those cases it is a slower form of `async` rendering.
- _Pros_: Works if JavaScript is disabled or not supported on the users device.
- _Cons_
@@ -79,13 +84,13 @@ Because it offers the best blend of performance characteristics, Leptos defaults
```rust
<Routes>
// Well load the home page with out-of-order streaming and <Suspense/>
<Route path="" view=|cx| view! { cx, <HomePage/> }/>
<Route path="" view=HomePage/>
// We'll load the posts with async rendering, so they can set
// the title and metadata *after* loading the data
<Route
path="/post/:id"
view=|cx| view! { cx, <Post/> }
view=Post
ssr=SsrMode::Async
/>
</Routes>
@@ -105,14 +110,14 @@ With blocking resources, I can do something like this:
```rust
#[component]
pub fn BlogPost(cx: Scope) -> impl IntoView {
let post_data = create_blocking_resource(cx, /* load blog post */);
let comment_data = create_resource(cx, /* load blog post */);
view! { cx,
pub fn BlogPost() -> impl IntoView {
let post_data = create_blocking_resource(/* load blog post */);
let comment_data = create_resource(/* load blog post */);
view! {
<Suspense fallback=|| ()>
{move || {
post_data.with(cx, |data| {
view! { cx,
post_data.with(|data| {
view! {
<Title text=data.title/>
<Meta name="description" content=data.excerpt/>
<article>

View File

@@ -8,8 +8,8 @@ Put a log somewhere in your root component. (I usually call mine `<App/>`, but a
```rust
#[component]
pub fn App(cx: Scope) -> impl IntoView {
leptos::log!("where do I run?");
pub fn App() -> impl IntoView {
logging::log!("where do I run?");
// ... whatever
}
```
@@ -57,15 +57,15 @@ One way to create a bug is by creating a mismatch between the HTML thats sent
```rust
#[component]
pub fn App(cx: Scope) -> impl IntoView {
pub fn App() -> impl IntoView {
let data = if cfg!(target_arch = "wasm32") {
vec![0, 1, 2]
} else {
vec![]
};
data.into_iter()
.map(|value| view! { cx, <span>{value}</span> })
.collect_view(cx)
.map(|value| view! { <span>{value}</span> })
.collect_view()
}
```
@@ -74,11 +74,11 @@ In other words, if this is being compiled to WASM, it has three items; otherwise
When I load the page in the browser, I see nothing. If I open the console I see a bunch of warnings:
```
element with id 0-0-1 not found, ignoring it for hydration
element with id 0-0-2 not found, ignoring it for hydration
element with id 0-0-3 not found, ignoring it for hydration
component with id _0-0-4c not found, ignoring it for hydration
component with id _0-0-4o not found, ignoring it for hydration
element with id 0-3 not found, ignoring it for hydration
element with id 0-4 not found, ignoring it for hydration
element with id 0-5 not found, ignoring it for hydration
component with id _0-6c not found, ignoring it for hydration
component with id _0-6o not found, ignoring it for hydration
```
The WASM version of your app, running in the browser, expects to find three items; but the HTML has none.
@@ -87,6 +87,56 @@ The WASM version of your app, running in the browser, expects to find three item
Its pretty rare that you do this intentionally, but it could happen from somehow running different logic on the server and in the browser. If youre seeing warnings like this and you dont think its your fault, its much more likely that its a bug with `<Suspense/>` or something. Feel free to go ahead and open an [issue](https://github.com/leptos-rs/leptos/issues) or [discussion](https://github.com/leptos-rs/leptos/discussions) on GitHub for help.
### Mutating the DOM during rendering
This is a slightly more common way to create a client/server mismatch: updating a signal _during rendering_ in a way that mutates the view.
```rust
#[component]
pub fn App() -> impl IntoView {
let (loaded, set_loaded) = create_signal(false);
// create_effect only runs on the client
create_effect(move |_| {
// do something like reading from localStorage
set_loaded(true);
});
move || {
if loaded() {
view! { <p>"Hello, world!"</p> }.into_any()
} else {
view! { <div class="loading">"Loading..."</div> }.into_any()
}
}
}
```
This one gives us the scary panic
```
panicked at 'assertion failed: `(left == right)`
left: `"DIV"`,
right: `"P"`: SSR and CSR elements have the same hydration key but different node kinds.
```
And a handy link to this page!
The problem here is that `create_effect` runs **immediately** and **synchronously**, but only in the browser. As a result, on the server, `loaded` is false, and a `<div>` is rendered. But on the browser, by the time the view is being rendered, `loaded` has already been set to `true`, and the browser is expecting to find a `<p>`.
#### Solution
You can simply tell the effect to wait a tick before updating the signal, by using something like `request_animation_frame`, which will set a short timeout and then update the signal before the next frame.
```rust
create_effect(move |_| {
// do something like reading from localStorage
request_animation_frame(move || set_loaded(true));
});
```
This allows the browser to hydrate with the correct, matching state (`loaded` is `false` when it reaches the view), then immediately update it to `true` once hydration is complete.
### Not all client code can run on the server
Imagine you happily import a dependency like `gloo-net` that youve been used to using to make requests in the browser, and use it in a `create_resource` in a server-rendered app.
@@ -113,10 +163,10 @@ For example, say that I want to store something in the browsers `localStorage
```rust
#[component]
pub fn App(cx: Scope) -> impl IntoView {
pub fn App() -> impl IntoView {
use gloo_storage::Storage;
let storage = gloo_storage::LocalStorage::raw();
leptos::log!("{storage:?}");
logging::log!("{storage:?}");
}
```
@@ -126,11 +176,11 @@ But if I wrap it in an effect...
```rust
#[component]
pub fn App(cx: Scope) -> impl IntoView {
pub fn App() -> impl IntoView {
use gloo_storage::Storage;
create_effect(cx, move |_| {
create_effect(move |_| {
let storage = gloo_storage::LocalStorage::raw();
leptos::log!("{storage:?}");
logging::log!("{storage:?}");
});
}
```

View File

@@ -14,8 +14,8 @@ For example, instead of embedding logic in a component directly like this:
```rust
#[component]
pub fn TodoApp(cx: Scope) -> impl IntoView {
let (todos, set_todos) = create_signal(cx, vec![Todo { /* ... */ }]);
pub fn TodoApp() -> impl IntoView {
let (todos, set_todos) = create_signal(vec![Todo { /* ... */ }]);
// ⚠️ this is hard to test because it's embedded in the component
let num_remaining = move || todos.with(|todos| {
todos.iter().filter(|todo| !todo.completed).sum()
@@ -37,14 +37,14 @@ impl Todos {
#[cfg(test)]
mod tests {
#[test]
fn test_remaining {
fn test_remaining() {
// ...
}
}
#[component]
pub fn TodoApp(cx: Scope) -> impl IntoView {
let (todos, set_todos) = create_signal(cx, Todos(vec![Todo { /* ... */ }]));
pub fn TodoApp() -> impl IntoView {
let (todos, set_todos) = create_signal(Todos(vec![Todo { /* ... */ }]));
// ✅ this has a test associated with it
let num_remaining = move || todos.with(Todos::num_remaining);
}
@@ -53,98 +53,49 @@ pub fn TodoApp(cx: Scope) -> impl IntoView {
In general, the less of your logic is wrapped into your components themselves, the
more idiomatic your code will feel and the easier it will be to test.
## 2. Test components with `wasm-bindgen-test`
## 2. Test components with end-to-end (`e2e`) testing
[`wasm-bindgen-test`](https://crates.io/crates/wasm-bindgen-test) is a great utility
for integrating or end-to-end testing WebAssembly apps in a headless browser.
Our [`examples`](https://github.com/leptos-rs/leptos/tree/main/examples) directory has several examples with extensive end-to-end testing, using different testing tools.
To use this testing utility, you need to add `wasm-bindgen-test` to your `Cargo.toml`:
The easiest way to see how to use these is to take a look at the test examples themselves:
```toml
[dev-dependencies]
wasm-bindgen-test = "0.3.0"
```
### `wasm-bindgen-test` with [`counter`](https://github.com/leptos-rs/leptos/blob/main/examples/counter/tests/web.rs)
You should create tests in a separate `tests` directory. You can then run your tests in the browser of your choice:
This is a fairly simple manual testing setup that uses the [`wasm-pack test`](https://rustwasm.github.io/wasm-pack/book/commands/test.html) command.
```bash
wasm-pack test --firefox
```
#### Sample Test
> To see the full setup, check out the tests for the [`counter`](https://github.com/leptos-rs/leptos/tree/main/examples/counter) example.
### Writing Your Tests
Most tests will involve some combination of vanilla DOM manipulation and comparison to a `view`. For example, heres a test [for the
`counter` example](https://github.com/leptos-rs/leptos/blob/main/examples/counter/tests/mod.rs).
First, we set up the testing environment.
```rust
use wasm_bindgen_test::*;
use counter::*;
use leptos::*;
use web_sys::HtmlElement;
// tell the test runner to run tests in the browser
wasm_bindgen_test_configure!(run_in_browser);
```
Im going to create a simpler wrapper for each test case, and mount it there.
This makes it easy to encapsulate the test results.
```rust
// like marking a regular test with #[test]
````rust
#[wasm_bindgen_test]
fn clear() {
let document = leptos::document();
let test_wrapper = document.create_element("section").unwrap();
document.body().unwrap().append_child(&test_wrapper);
let _ = document.body().unwrap().append_child(&test_wrapper);
// start by rendering our counter and mounting it to the DOM
// note that we start at the initial value of 10
mount_to(
test_wrapper.clone().unchecked_into(),
|cx| view! { cx, <SimpleCounter initial_value=10 step=1/> },
|| view! { <SimpleCounter initial_value=10 step=1/> },
);
}
```
Well use some manual DOM operations to grab the `<div>` that wraps
the whole component, as well as the `clear` button.
let div = test_wrapper.query_selector("div").unwrap().unwrap();
let clear = test_wrapper
.query_selector("button")
.unwrap()
.unwrap()
.unchecked_into::<web_sys::HtmlElement>();
```rust
// now we extract the buttons by iterating over the DOM
// this would be easier if they had IDs
let div = test_wrapper.query_selector("div").unwrap().unwrap();
let clear = test_wrapper
.query_selector("button")
.unwrap()
.unwrap()
.unchecked_into::<web_sys::HtmlElement>();
```
Now we can use ordinary DOM APIs to simulate user interaction.
```rust
// now let's click the `clear` button
clear.click();
```
You can test individual DOM element attributes or text node values. Sometimes
I like to test the whole view at once. We can do this by testing the elements
`outerHTML` against our expectations.
clear.click();
```rust
assert_eq!(
div.outer_html(),
// here we spawn a mini reactive system to render the test case
run_scope(create_runtime(), |cx| {
run_scope(create_runtime(), || {
// it's as if we're creating it with a value of 0, right?
let (value, set_value) = create_signal(cx, 0);
let (value, set_value) = create_signal(0);
// we can remove the event listeners because they're not rendered to HTML
view! { cx,
view! {
<div>
<button>"Clear"</button>
<button>"-1"</button>
@@ -157,24 +108,112 @@ assert_eq!(
.outer_html()
})
);
```
````
That test involved us manually replicating the `view` thats inside the component.
There's actually an easier way to do this... We can just test against a `<SimpleCounter/>`
with the initial value `0`. This is where our wrapping element comes in: Ill just test
the wrappers `innerHTML` against another comparison case.
### [`wasm-bindgen-test` with `counters_stable`](https://github.com/leptos-rs/leptos/tree/main/examples/counters_stable/tests/web)
This more developed test suite uses a system of fixtures to refactor the manual DOM manipulation of the `counter` tests and easily test a wide range of cases.
#### Sample Test
```rust
assert_eq!(test_wrapper.inner_html(), {
let comparison_wrapper = document.create_element("section").unwrap();
leptos::mount_to(
comparison_wrapper.clone().unchecked_into(),
|cx| view! { cx, <SimpleCounter initial_value=0 step=1/>},
);
comparison_wrapper.inner_html()
use super::*;
use crate::counters_page as ui;
use pretty_assertions::assert_eq;
#[wasm_bindgen_test]
fn should_increase_the_total_count() {
// Given
ui::view_counters();
ui::add_counter();
// When
ui::increment_counter(1);
ui::increment_counter(1);
ui::increment_counter(1);
// Then
assert_eq!(ui::total(), 3);
}
```
### [Playwright with `counters_stable`](https://github.com/leptos-rs/leptos/tree/main/examples/counters_stable/e2e)
These tests use the common JavaScript testing tool Playwright to run end-to-end tests on the same example, using a library and testing approach familiar to may who have done frontend development before.
#### Sample Test
```js
import { test, expect } from "@playwright/test";
import { CountersPage } from "./fixtures/counters_page";
test.describe("Increment Count", () => {
test("should increase the total count", async ({ page }) => {
const ui = new CountersPage(page);
await ui.goto();
await ui.addCounter();
await ui.incrementCount();
await ui.incrementCount();
await ui.incrementCount();
await expect(ui.total).toHaveText("3");
});
});
```
This is only a very limited introduction to testing. But I hope its useful as you begin to build applications.
### [Gherkin/Cucumber Tests with `todo_app_sqlite`](https://github.com/leptos-rs/leptos/blob/main/examples/todo_app_sqlite/e2e/README.md)
> For more, see [the testing section of the `wasm-bindgen` guide](https://rustwasm.github.io/wasm-bindgen/wasm-bindgen-test/index.html#testing-on-wasm32-unknown-unknown-with-wasm-bindgen-test).
You can integrate any testing tool youd like into this flow. This example uses Cucumber, a testing framework based on natural language.
```
@add_todo
Feature: Add Todo
Background:
Given I see the app
@add_todo-see
Scenario: Should see the todo
Given I set the todo as Buy Bread
When I click the Add button
Then I see the todo named Buy Bread
# @allow.skipped
@add_todo-style
Scenario: Should see the pending todo
When I add a todo as Buy Oranges
Then I see the pending todo
```
The definitions for these actions are defined in Rust code.
```rust
use crate::fixtures::{action, world::AppWorld};
use anyhow::{Ok, Result};
use cucumber::{given, when};
#[given("I see the app")]
#[when("I open the app")]
async fn i_open_the_app(world: &mut AppWorld) -> Result<()> {
let client = &world.client;
action::goto_path(client, "").await?;
Ok(())
}
#[given(regex = "^I add a todo as (.*)$")]
#[when(regex = "^I add a todo as (.*)$")]
async fn i_add_a_todo_titled(world: &mut AppWorld, text: String) -> Result<()> {
let client = &world.client;
action::add_todo(client, text.as_str()).await?;
Ok(())
}
// etc.
```
### Learning More
Feel free to check out the CI setup in the Leptos repo to learn more about how to use these tools in your own application. All of these testing methods are run regularly against actual Leptos example apps.

View File

@@ -13,7 +13,7 @@ DOM, with self-contained, defined behavior. Unlike HTML elements, they are in
```rust
fn main() {
leptos::mount_to_body(|cx| view! { cx, <App/> })
leptos::mount_to_body(|| view! { <App/> })
}
```
@@ -22,10 +22,10 @@ Ill give you the whole thing up front, then walk through it line by line.
```rust
#[component]
fn App(cx: Scope) -> impl IntoView {
let (count, set_count) = create_signal(cx, 0);
fn App() -> impl IntoView {
let (count, set_count) = create_signal(0);
view! { cx,
view! {
<button
on:click=move |_| {
set_count(3);
@@ -49,18 +49,17 @@ used as a component in your Leptos application. Well see some of the other fe
this macro in a couple chapters.
```rust
fn App(cx: Scope) -> impl IntoView
fn App() -> impl IntoView
```
Every component is a function with the following characteristics
1. It takes a reactive [`Scope`](https://docs.rs/leptos/latest/leptos/struct.Scope.html)
as its first argument. This `Scope` is our entrypoint into the reactive system.
By convention, its usually named `cx`.
2. You can include other arguments, which will be available as component “props.”
3. Component functions return `impl IntoView`, which is an opaque type that includes
1. It takes zero or more arguments of any type.
2. It returns `impl IntoView`, which is an opaque type that includes
anything you could return from a Leptos `view`.
> Component function arguments are gathered together into a single props struct which is built by the `view` macro as needed.
## The Component Body
The body of the component function is a set-up function that runs once, not a
@@ -69,7 +68,7 @@ few reactive variables, define any side effects that run in response to those va
changing, and describe the user interface.
```rust
let (count, set_count) = create_signal(cx, 0);
let (count, set_count) = create_signal(0);
```
[`create_signal`](https://docs.rs/leptos/latest/leptos/fn.create_signal.html)
@@ -85,7 +84,7 @@ current value, youll call `set_count.set(...)` (or `set_count(...)`).
Leptos defines user interfaces using a JSX-like format via the [`view`](https://docs.rs/leptos/latest/leptos/macro.view.html) macro.
```rust
view! { cx,
view! {
<button
// define an event listener with on:
on:click=move |_| {
@@ -127,7 +126,7 @@ Leptos with `nightly` Rust, signals are already functions, so the closure is unn
As a result, you can write a simpler view:
```rust
view! { cx,
view! {
<button /* ... */>
"Click me: "
// identical to {move || count.get()}
@@ -139,7 +138,7 @@ view! { cx,
Remember—and this is _very important_—only functions are reactive. This means that
`{count}` and `{count()}` do very different things in your view. `{count}` passes
in a function, telling the framework to update the view every time `count` changes.
`{count()}` access the value of `count` once, and passes an `i32` into the view,
`{count()}` accesses the value of `count` once, and passes an `i32` into the view,
rendering it once, unreactively. You can see the difference in the CodeSandbox below!
Lets make one final change. `set_count(3)` is a pretty useless thing for a click handler to do. Lets replace “set this value to 3” with “increment this value by 1”:
@@ -160,3 +159,67 @@ Other Previews > 8080.` Hover over any of the variables to show Rust-Analyzer de
[Click to open CodeSandbox.](https://codesandbox.io/p/sandbox/1-basic-component-3d74p3?file=%2Fsrc%2Fmain.rs&selection=%5B%7B%22endColumn%22%3A31%2C%22endLineNumber%22%3A19%2C%22startColumn%22%3A31%2C%22startLineNumber%22%3A19%7D%5D)
<iframe src="https://codesandbox.io/p/sandbox/1-basic-component-3d74p3?file=%2Fsrc%2Fmain.rs&selection=%5B%7B%22endColumn%22%3A31%2C%22endLineNumber%22%3A19%2C%22startColumn%22%3A31%2C%22startLineNumber%22%3A19%7D%5D" width="100%" height="1000px" style="max-height: 100vh"></iframe>
<details>
<summary>CodeSandbox Source</summary>
```rust
use leptos::*;
// The #[component] macro marks a function as a reusable component
// Components are the building blocks of your user interface
// They define a reusable unit of behavior
#[component]
fn App() -> impl IntoView {
// here we create a reactive signal
// and get a (getter, setter) pair
// signals are the basic unit of change in the framework
// we'll talk more about them later
let (count, set_count) = create_signal(0);
// the `view` macro is how we define the user interface
// it uses an HTML-like format that can accept certain Rust values
view! {
<button
// on:click will run whenever the `click` event fires
// every event handler is defined as `on:{eventname}`
// we're able to move `set_count` into the closure
// because signals are Copy and 'static
on:click=move |_| {
set_count.update(|n| *n += 1);
}
>
// text nodes in RSX should be wrapped in quotes,
// like a normal Rust string
"Click me"
</button>
<p>
<strong>"Reactive: "</strong>
// you can insert Rust expressions as values in the DOM
// by wrapping them in curly braces
// if you pass in a function, it will reactively update
{move || count.get()}
</p>
<p>
<strong>"Reactive shorthand: "</strong>
// signals are functions, so we can remove the wrapping closure
{count}
</p>
<p>
<strong>"Not reactive: "</strong>
// NOTE: if you write {count()}, this will *not* be reactive
// it simply gets the value of count once
{count()}
</p>
}
}
// This `main` function is the entry point into the app
// It just mounts our component to the <body>
// Because we defined it as `fn App`, we can now use it in a
// template as <App/>
fn main() {
leptos::mount_to_body(|| view! { <App/> })
}
```

View File

@@ -12,10 +12,10 @@ increment a counter.
```rust
#[component]
fn App(cx: Scope) -> impl IntoView {
let (count, set_count) = create_signal(cx, 0);
fn App() -> impl IntoView {
let (count, set_count) = create_signal(0);
view! { cx,
view! {
<button
on:click=move |_| {
set_count.update(|n| *n += 1);
@@ -73,9 +73,9 @@ class=("button-20", move || count() % 2 == 1)
Individual CSS properties can be directly updated with a similar `style:` syntax.
```rust
let (x, set_x) = create_signal(cx, 0);
let (y, set_y) = create_signal(cx, 0);
view! { cx,
let (x, set_x) = create_signal(0);
let (y, set_y) = create_signal(0);
view! {
<div
style="position: absolute"
style:left=move || format!("{}px", x() + 100)
@@ -144,11 +144,92 @@ let double_count = move || count() * 2;
Derived signals let you create reactive computed values that can be used in multiple
places in your application with minimal overhead.
> Note: Using a derived signal like this means that the calculation runs once per
> signal change per place we access `double_count`; in other words, twice. This is a
> very cheap calculation, so thats fine. Well look at memos in a later chapter, which
> are designed to solve this problem for expensive calculations.
Note: Using a derived signal like this means that the calculation runs once per
signal change and once per place we access `double_count`; in other words, twice. This is a
very cheap calculation, so thats fine. Well look at memos in a later chapter, which
are designed to solve this problem for expensive calculations.
> #### Advanced Topic: Injecting Raw HTML
>
> The `view` macro provides support for an additional attribute, `inner_html`, which
> can be used to directly set the HTML contents of any element, wiping out any other
> children youve given it. Note that this does _not_ escape the HTML you provide. You
> should make sure that it only contains trusted input or that any HTML entities are
> escaped, to prevent cross-site scripting (XSS) attacks.
>
> ```rust
> let html = "<p>This HTML will be injected.</p>";
> view! {
> <div inner_html=html/>
> }
> ```
>
> [Click here for the full `view` macros docs](https://docs.rs/leptos/latest/leptos/macro.view.html).
[Click to open CodeSandbox.](https://codesandbox.io/p/sandbox/2-dynamic-attribute-pqyvzl?file=%2Fsrc%2Fmain.rs&selection=%5B%7B%22endColumn%22%3A1%2C%22endLineNumber%22%3A2%2C%22startColumn%22%3A1%2C%22startLineNumber%22%3A2%7D%5D)
<iframe src="https://codesandbox.io/p/sandbox/2-dynamic-attribute-pqyvzl?file=%2Fsrc%2Fmain.rs&selection=%5B%7B%22endColumn%22%3A1%2C%22endLineNumber%22%3A2%2C%22startColumn%22%3A1%2C%22startLineNumber%22%3A2%7D%5D" width="100%" height="1000px" style="max-height: 100vh"></iframe>
<details>
<summary>Code Sandbox Source</summary>
```rust
use leptos::*;
#[component]
fn App() -> impl IntoView {
let (count, set_count) = create_signal(0);
// a "derived signal" is a function that accesses other signals
// we can use this to create reactive values that depend on the
// values of one or more other signals
let double_count = move || count() * 2;
view! {
<button
on:click=move |_| {
set_count.update(|n| *n += 1);
}
// the class: syntax reactively updates a single class
// here, we'll set the `red` class when `count` is odd
class:red=move || count() % 2 == 1
>
"Click me"
</button>
// NOTE: self-closing tags like <br> need an explicit /
<br/>
// We'll update this progress bar every time `count` changes
<progress
// static attributes work as in HTML
max="50"
// passing a function to an attribute
// reactively sets that attribute
// signals are functions, so this <=> `move || count.get()`
value=count
>
</progress>
<br/>
// This progress bar will use `double_count`
// so it should move twice as fast!
<progress
max="50"
// derived signals are functions, so they can also
// reactive update the DOM
value=double_count
>
</progress>
<p>"Count: " {count}</p>
<p>"Double Count: " {double_count}</p>
}
}
fn main() {
leptos::mount_to_body(|| view! { <App/> })
}
```
</details>
</preview>

View File

@@ -12,10 +12,10 @@ per click.
You _could_ do this by just creating two `<progress>` elements:
```rust
let (count, set_count) = create_signal(cx, 0);
let (count, set_count) = create_signal(0);
let double_count = move || count() * 2;
view! { cx,
view! {
<progress
max="50"
value=count
@@ -35,10 +35,8 @@ Instead, lets create a `<ProgressBar/>` component.
```rust
#[component]
fn ProgressBar(
cx: Scope
) -> impl IntoView {
view! { cx,
fn ProgressBar() -> impl IntoView {
view! {
<progress
max="50"
// hmm... where will we get this from?
@@ -64,10 +62,9 @@ In Leptos, you define props by giving additional arguments to the component func
```rust
#[component]
fn ProgressBar(
cx: Scope,
progress: ReadSignal<i32>
) -> impl IntoView {
view! { cx,
view! {
<progress
max="50"
// now this works
@@ -81,9 +78,9 @@ Now we can use our component in the main `<App/>` components view.
```rust
#[component]
fn App(cx: Scope) -> impl IntoView {
let (count, set_count) = create_signal(cx, 0);
view! { cx,
fn App() -> impl IntoView {
let (count, set_count) = create_signal(0);
view! {
<button on:click=move |_| { set_count.update(|n| *n += 1); }>
"Click me"
</button>
@@ -118,14 +115,13 @@ argument to the component function with `#[prop(optional)]`.
```rust
#[component]
fn ProgressBar(
cx: Scope,
// mark this prop optional
// you can specify it or not when you use <ProgressBar/>
#[prop(optional)]
max: u16,
progress: ReadSignal<i32>
) -> impl IntoView {
view! { cx,
view! {
<progress
max=max
value=progress
@@ -149,12 +145,11 @@ with `#[prop(default = ...)`.
```rust
#[component]
fn ProgressBar(
cx: Scope,
#[prop(default = 100)]
max: u16,
progress: ReadSignal<i32>
) -> impl IntoView {
view! { cx,
view! {
<progress
max=max
value=progress
@@ -171,11 +166,11 @@ as the `progress` prop on another `<ProgressBar/>`.
```rust
#[component]
fn App(cx: Scope) -> impl IntoView {
let (count, set_count) = create_signal(cx, 0);
fn App() -> impl IntoView {
let (count, set_count) = create_signal(0);
let double_count = move || count() * 2;
view! { cx,
view! {
<button on:click=move |_| { set_count.update(|n| *n += 1); }>
"Click me"
</button>
@@ -199,7 +194,6 @@ implement the trait `Fn() -> i32`. So you could use a generic component:
```rust
#[component]
fn ProgressBar<F>(
cx: Scope,
#[prop(default = 100)]
max: u16,
progress: F
@@ -207,7 +201,7 @@ fn ProgressBar<F>(
where
F: Fn() -> i32 + 'static,
{
view! { cx,
view! {
<progress
max=max
value=progress
@@ -219,9 +213,24 @@ where
This is a perfectly reasonable way to write this component: `progress` now takes
any value that implements this `Fn()` trait.
> Note that generic component props _cannot_ be specified inline (as `<F: Fn() -> i32>`)
> or as `progress: impl Fn() -> i32 + 'static,`, in part because theyre actually used to generate
> a `struct ProgressBarProps`, and struct fields cannot be `impl` types.
This generic can also be specified inline:
```rust
#[component]
fn ProgressBar<F: Fn() -> i32 + 'static>(
#[prop(default = 100)] max: u16,
progress: F,
) -> impl IntoView {
view! {
<progress
max=max
value=progress
/>
}
}
```
> Note that generic component props _cant_ be specified with an `impl` yet (`progress: impl Fn() -> i32 + 'static,`), in part because theyre actually used to generate a `struct ProgressBarProps`, and struct fields cannot be `impl` types. The `#[component]` macro may be further improved in the future to allow inline `impl` generic props.
### `into` Props
@@ -239,14 +248,13 @@ reactive value.
```rust
#[component]
fn ProgressBar(
cx: Scope,
#[prop(default = 100)]
max: u16,
#[prop(into)]
progress: Signal<i32>
) -> impl IntoView
{
view! { cx,
view! {
<progress
max=max
value=progress
@@ -255,22 +263,95 @@ fn ProgressBar(
}
#[component]
fn App(cx: Scope) -> impl IntoView {
let (count, set_count) = create_signal(cx, 0);
fn App() -> impl IntoView {
let (count, set_count) = create_signal(0);
let double_count = move || count() * 2;
view! { cx,
view! {
<button on:click=move |_| { set_count.update(|n| *n += 1); }>
"Click me"
</button>
// .into() converts `ReadSignal` to `Signal`
<ProgressBar progress=count/>
// use `Signal::derive()` to wrap a derived signal
<ProgressBar progress=Signal::derive(cx, double_count)/>
<ProgressBar progress=Signal::derive(double_count)/>
}
}
```
### Optional Generic Props
Note that you cant specify optional generic props for a component. Lets see what would happen if you try:
```rust,compile_fail
#[component]
fn ProgressBar<F: Fn() -> i32 + 'static>(
#[prop(optional)] progress: Option<F>,
) -> impl IntoView {
progress.map(|progress| {
view! {
<progress
max=100
value=progress
/>
}
})
}
#[component]
pub fn App() -> impl IntoView {
view! {
<ProgressBar/>
}
}
```
Rust helpfully gives the error
```
xx | <ProgressBar/>
| ^^^^^^^^^^^ cannot infer type of the type parameter `F` declared on the function `ProgressBar`
|
help: consider specifying the generic argument
|
xx | <ProgressBar::<F>/>
| +++++
```
There are just two problems:
1. Leptoss view macro doesnt support specifying a generic on a component with this turbofish syntax.
2. Even if you could, specifying the correct type here is not possible; closures and functions in general are unnameable types. The compiler can display them with a shorthand, but you cant specify them.
However, you can get around this by providing a concrete type using `Box<dyn _>` or `&dyn _`:
```rust
#[component]
fn ProgressBar(
#[prop(optional)] progress: Option<Box<dyn Fn() -> i32>>,
) -> impl IntoView {
progress.map(|progress| {
view! {
<progress
max=100
value=progress
/>
}
})
}
#[component]
pub fn App() -> impl IntoView {
view! {
<ProgressBar/>
}
}
```
Because the Rust compiler now knows the concrete type of the prop, and therefore its size in memory even in the `None` case, this compiles fine.
> In this particular case, `&dyn Fn() -> i32` will cause lifetime issues, but in other cases, it may be a possibility.
## Documenting Components
This is one of the least essential but most important sections of this book.
@@ -285,7 +366,6 @@ component function, and each one of the props:
/// Shows progress toward a goal.
#[component]
fn ProgressBar(
cx: Scope,
/// The maximum value of the progress bar.
#[prop(default = 100)]
max: u16,
@@ -306,6 +386,96 @@ type, and each of the fields used to add props. It can be a little hard to
understand how powerful this is until you hover over the component name or props
and see the power of the `#[component]` macro combined with rust-analyzer here.
> #### Advanced Topic: `#[component(transparent)]`
>
> All Leptos components return `-> impl IntoView`. Some, though, need to return
> some data directly without any additional wrapping. These can be marked with
> `#[component(transparent)]`, in which case they return exactly the value they
> return, without the rendering system transforming them in any way.
>
> This is mostly used in two situations:
>
> 1. Creating wrappers around `<Suspense/>` or `<Transition/>`, which return a
> transparent suspense structure to integrate with SSR and hydration properly.
> 2. Refactoring `<Route/>` definitions for `leptos_router` out into separate
> components, because `<Route/>` is a transparent component that returns a
> `RouteDefinition` struct rather than a view.
>
> In general, you should not need to use transparent components unless you are
> creating custom wrapping components that fall into one of these two categories.
[Click to open CodeSandbox.](https://codesandbox.io/p/sandbox/3-components-50t2e7?file=%2Fsrc%2Fmain.rs&selection=%5B%7B%22endColumn%22%3A1%2C%22endLineNumber%22%3A7%2C%22startColumn%22%3A1%2C%22startLineNumber%22%3A7%7D%5D)
<iframe src="https://codesandbox.io/p/sandbox/3-components-50t2e7?file=%2Fsrc%2Fmain.rs&selection=%5B%7B%22endColumn%22%3A1%2C%22endLineNumber%22%3A7%2C%22startColumn%22%3A1%2C%22startLineNumber%22%3A7%7D%5D" width="100%" height="1000px" style="max-height: 100vh"></iframe>
<details>
<summary>CodeSandbox Source</summary>
```rust
use leptos::*;
// Composing different components together is how we build
// user interfaces. Here, we'll define a resuable <ProgressBar/>.
// You'll see how doc comments can be used to document components
// and their properties.
/// Shows progress toward a goal.
#[component]
fn ProgressBar(
// Marks this as an optional prop. It will default to the default
// value of its type, i.e., 0.
#[prop(default = 100)]
/// The maximum value of the progress bar.
max: u16,
// Will run `.into()` on the value passed into the prop.
#[prop(into)]
// `Signal<T>` is a wrapper for several reactive types.
// It can be helpful in component APIs like this, where we
// might want to take any kind of reactive value
/// How much progress should be displayed.
progress: Signal<i32>,
) -> impl IntoView {
view! {
<progress
max={max}
value=progress
/>
<br/>
}
}
#[component]
fn App() -> impl IntoView {
let (count, set_count) = create_signal(0);
let double_count = move || count() * 2;
view! {
<button
on:click=move |_| {
set_count.update(|n| *n += 1);
}
>
"Click me"
</button>
<br/>
// If you have this open in CodeSandbox or an editor with
// rust-analyzer support, try hovering over `ProgressBar`,
// `max`, or `progress` to see the docs we defined above
<ProgressBar max=50 progress=count/>
// Let's use the default max value on this one
// the default is 100, so it should move half as fast
<ProgressBar progress=count/>
// Signal::derive creates a Signal wrapper from our derived signal
// using double_count means it should move twice as fast
<ProgressBar max=50 progress=Signal::derive(double_count)/>
}
}
fn main() {
leptos::mount_to_body(|| view! { <App/> })
}
```
</details>
</preview>

View File

@@ -19,30 +19,30 @@ any `Vec<IV> where IV: IntoView` into your view. In other words, if you can rend
```rust
let values = vec![0, 1, 2];
view! { cx,
view! {
// this will just render "012"
<p>{values.clone()}</p>
// or we can wrap them in <li>
<ul>
{values.into_iter()
.map(|n| view! { cx, <li>{n}</li>})
.map(|n| view! { <li>{n}</li>})
.collect::<Vec<_>>()}
</ul>
}
```
Leptos also provides a `.collect_view(cx)` helper function that allows you to collect any iterator of `T: IntoView` into `Vec<View>`.
Leptos also provides a `.collect_view()` helper function that allows you to collect any iterator of `T: IntoView` into `Vec<View>`.
```rust
let values = vec![0, 1, 2];
view! { cx,
view! {
// this will just render "012"
<p>{values.clone()}</p>
// or we can wrap them in <li>
<ul>
{values.into_iter()
.map(|n| view! { cx, <li>{n}</li>})
.collect_view(cx)}
.map(|n| view! { <li>{n}</li>})
.collect_view()}
</ul>
}
```
@@ -52,13 +52,13 @@ You can render dynamic items as part of a static list.
```rust
// create a list of N signals
let counters = (1..=length).map(|idx| create_signal(cx, idx));
let counters = (1..=length).map(|idx| create_signal(idx));
// each item manages a reactive view
// but the list itself will never change
let counter_buttons = counters
.map(|(count, set_count)| {
view! { cx,
view! {
<li>
<button
on:click=move |_| set_count.update(|n| *n += 1)
@@ -68,9 +68,9 @@ let counter_buttons = counters
</li>
}
})
.collect_view(cx);
.collect_view();
view! { cx,
view! {
<ul>{counter_buttons}</ul>
}
```
@@ -106,3 +106,162 @@ Check out the `<DynamicList/>` component below for an example.
[Click to open CodeSandbox.](https://codesandbox.io/p/sandbox/4-iteration-sglt1o?file=%2Fsrc%2Fmain.rs&selection=%5B%7B%22endColumn%22%3A6%2C%22endLineNumber%22%3A55%2C%22startColumn%22%3A5%2C%22startLineNumber%22%3A31%7D%5D)
<iframe src="https://codesandbox.io/p/sandbox/4-iteration-sglt1o?file=%2Fsrc%2Fmain.rs&selection=%5B%7B%22endColumn%22%3A6%2C%22endLineNumber%22%3A55%2C%22startColumn%22%3A5%2C%22startLineNumber%22%3A31%7D%5D" width="100%" height="1000px" style="max-height: 100vh"></iframe>
<details>
<summary>CodeSandbox Source</summary>
```rust
use leptos::*;
// Iteration is a very common task in most applications.
// So how do you take a list of data and render it in the DOM?
// This example will show you the two ways:
// 1) for mostly-static lists, using Rust iterators
// 2) for lists that grow, shrink, or move items, using <For/>
#[component]
fn App() -> impl IntoView {
view! {
<h1>"Iteration"</h1>
<h2>"Static List"</h2>
<p>"Use this pattern if the list itself is static."</p>
<StaticList length=5/>
<h2>"Dynamic List"</h2>
<p>"Use this pattern if the rows in your list will change."</p>
<DynamicList initial_length=5/>
}
}
/// A list of counters, without the ability
/// to add or remove any.
#[component]
fn StaticList(
/// How many counters to include in this list.
length: usize,
) -> impl IntoView {
// create counter signals that start at incrementing numbers
let counters = (1..=length).map(|idx| create_signal(idx));
// when you have a list that doesn't change, you can
// manipulate it using ordinary Rust iterators
// and collect it into a Vec<_> to insert it into the DOM
let counter_buttons = counters
.map(|(count, set_count)| {
view! {
<li>
<button
on:click=move |_| set_count.update(|n| *n += 1)
>
{count}
</button>
</li>
}
})
.collect::<Vec<_>>();
// Note that if `counter_buttons` were a reactive list
// and its value changed, this would be very inefficient:
// it would rerender every row every time the list changed.
view! {
<ul>{counter_buttons}</ul>
}
}
/// A list of counters that allows you to add or
/// remove counters.
#[component]
fn DynamicList(
/// The number of counters to begin with.
initial_length: usize,
) -> impl IntoView {
// This dynamic list will use the <For/> component.
// <For/> is a keyed list. This means that each row
// has a defined key. If the key does not change, the row
// will not be re-rendered. When the list changes, only
// the minimum number of changes will be made to the DOM.
// `next_counter_id` will let us generate unique IDs
// we do this by simply incrementing the ID by one
// each time we create a counter
let mut next_counter_id = initial_length;
// we generate an initial list as in <StaticList/>
// but this time we include the ID along with the signal
let initial_counters = (0..initial_length)
.map(|id| (id, create_signal(id + 1)))
.collect::<Vec<_>>();
// now we store that initial list in a signal
// this way, we'll be able to modify the list over time,
// adding and removing counters, and it will change reactively
let (counters, set_counters) = create_signal(initial_counters);
let add_counter = move |_| {
// create a signal for the new counter
let sig = create_signal(next_counter_id + 1);
// add this counter to the list of counters
set_counters.update(move |counters| {
// since `.update()` gives us `&mut T`
// we can just use normal Vec methods like `push`
counters.push((next_counter_id, sig))
});
// increment the ID so it's always unique
next_counter_id += 1;
};
view! {
<div>
<button on:click=add_counter>
"Add Counter"
</button>
<ul>
// The <For/> component is central here
// This allows for efficient, key list rendering
<For
// `each` takes any function that returns an iterator
// this should usually be a signal or derived signal
// if it's not reactive, just render a Vec<_> instead of <For/>
each=counters
// the key should be unique and stable for each row
// using an index is usually a bad idea, unless your list
// can only grow, because moving items around inside the list
// means their indices will change and they will all rerender
key=|counter| counter.0
// the view function receives each item from your `each` iterator
// and returns a view
view=move |(id, (count, set_count))| {
view! {
<li>
<button
on:click=move |_| set_count.update(|n| *n += 1)
>
{count}
</button>
<button
on:click=move |_| {
set_counters.update(|counters| {
counters.retain(|(counter_id, _)| counter_id != &id)
});
}
>
"Remove"
</button>
</li>
}
}
/>
</ul>
</div>
}
}
fn main() {
leptos::mount_to_body(|| view! { <App/> })
}
```
</details>
</preview>

View File

@@ -19,12 +19,13 @@ There are two important things to remember:
2. The `value` _attribute_ only sets the initial value of the input, i.e., it
only updates the input up to the point that you begin typing. The `value`
_property_ continues updating the input after that. You usually want to set
`prop:value` for this reason.
`prop:value` for this reason. (The same is true for `checked` and `prop:checked`
on an `<input type="checkbox">`.)
```rust
let (name, set_name) = create_signal(cx, "Controlled".to_string());
let (name, set_name) = create_signal("Controlled".to_string());
view! { cx,
view! {
<input type="text"
on:input=move |ev| {
// event_target_value is a Leptos helper function
@@ -42,6 +43,33 @@ view! { cx,
}
```
> #### Why do you need `prop:value`?
>
> Web browsers are the most ubiquitous and stable platform for rendering graphical user interfaces in existence. They have also maintained an incredible backwards compatibility over their three decades of existence. Inevitably, this means there are some quirks.
>
> One odd quirk is that there is a distinction between HTML attributes and DOM element properties, i.e., between something called an “attribute” which is parsed from HTML and can be set on a DOM element with `.setAttribute()`, and something called a “property” which is a field of the JavaScript class representation of that parsed HTML element.
>
> In the case of an `<input value=...>`, setting the `value` *attribute* is defined as setting the initial value for the input, and setting `value` *property* sets its current value. It maybe easiest to understand this by opening `about:blank` and running the following JavaScript in the browser console, line by line:
>
> ```js
> // create an input and append it to the DOM
> const el = document.createElement("input")
> document.body.appendChild(el)
>
> el.setAttribute("value", "test") // updates the input
> el.setAttribute("value", "another test") // updates the input again
>
> // now go and type into the input: delete some characters, etc.
>
> el.setAttribute("value", "one more time?")
> // nothing should have changed. setting the "initial value" does nothing now
>
> // however...
> el.value = "But this works"
> ```
>
> Many other frontend frameworks conflate attributes and properties, or create a special case for inputs that sets the value correctly. Maybe Leptos should do this too; but for now, I prefer giving users the maximum amount of control over whether theyre setting an attribute or a property, and doing my best to educate people about the actual underlying browser behavior rather than obscuring it.
## Uncontrolled Inputs
In an "uncontrolled input," the browser controls the state of the input element.
@@ -53,9 +81,9 @@ In this example, we only notify the framework when the `<form>` fires a `submit`
event.
```rust
let (name, set_name) = create_signal(cx, "Uncontrolled".to_string());
let (name, set_name) = create_signal("Uncontrolled".to_string());
let input_element: NodeRef<Input> = create_node_ref(cx);
let input_element: NodeRef<Input> = create_node_ref();
```
`NodeRef` is a kind of reactive smart pointer: we can use it to access the
@@ -89,7 +117,7 @@ We can then call `.value()` to get the value out of the input, because `NodeRef`
gives us access to a correctly-typed HTML element.
```rust
view! { cx,
view! {
<form on:submit=on_submit>
<input type="text"
value=name
@@ -112,3 +140,112 @@ The view should be pretty self-explanatory by now. Note two things:
[Click to open CodeSandbox.](https://codesandbox.io/p/sandbox/5-form-inputs-ih9m62?file=%2Fsrc%2Fmain.rs&selection=%5B%7B%22endColumn%22%3A1%2C%22endLineNumber%22%3A12%2C%22startColumn%22%3A1%2C%22startLineNumber%22%3A12%7D%5D)
<iframe src="https://codesandbox.io/p/sandbox/5-form-inputs-ih9m62?file=%2Fsrc%2Fmain.rs&selection=%5B%7B%22endColumn%22%3A1%2C%22endLineNumber%22%3A12%2C%22startColumn%22%3A1%2C%22startLineNumber%22%3A12%7D%5D" width="100%" height="1000px" style="max-height: 100vh"></iframe>
<details>
<summary>CodeSandbox Source</summary>
```rust
use leptos::{ev::SubmitEvent, *};
#[component]
fn App() -> impl IntoView {
view! {
<h2>"Controlled Component"</h2>
<ControlledComponent/>
<h2>"Uncontrolled Component"</h2>
<UncontrolledComponent/>
}
}
#[component]
fn ControlledComponent() -> impl IntoView {
// create a signal to hold the value
let (name, set_name) = create_signal("Controlled".to_string());
view! {
<input type="text"
// fire an event whenever the input changes
on:input=move |ev| {
// event_target_value is a Leptos helper function
// it functions the same way as event.target.value
// in JavaScript, but smooths out some of the typecasting
// necessary to make this work in Rust
set_name(event_target_value(&ev));
}
// the `prop:` syntax lets you update a DOM property,
// rather than an attribute.
//
// IMPORTANT: the `value` *attribute* only sets the
// initial value, until you have made a change.
// The `value` *property* sets the current value.
// This is a quirk of the DOM; I didn't invent it.
// Other frameworks gloss this over; I think it's
// more important to give you access to the browser
// as it really works.
//
// tl;dr: use prop:value for form inputs
prop:value=name
/>
<p>"Name is: " {name}</p>
}
}
#[component]
fn UncontrolledComponent() -> impl IntoView {
// import the type for <input>
use leptos::html::Input;
let (name, set_name) = create_signal("Uncontrolled".to_string());
// we'll use a NodeRef to store a reference to the input element
// this will be filled when the element is created
let input_element: NodeRef<Input> = create_node_ref();
// fires when the form `submit` event happens
// this will store the value of the <input> in our signal
let on_submit = move |ev: SubmitEvent| {
// stop the page from reloading!
ev.prevent_default();
// here, we'll extract the value from the input
let value = input_element()
// event handlers can only fire after the view
// is mounted to the DOM, so the `NodeRef` will be `Some`
.expect("<input> to exist")
// `NodeRef` implements `Deref` for the DOM element type
// this means we can call`HtmlInputElement::value()`
// to get the current value of the input
.value();
set_name(value);
};
view! {
<form on:submit=on_submit>
<input type="text"
// here, we use the `value` *attribute* to set only
// the initial value, letting the browser maintain
// the state after that
value=name
// store a reference to this input in `input_element`
node_ref=input_element
/>
<input type="submit" value="Submit"/>
</form>
<p>"Name is: " {name}</p>
}
}
// This `main` function is the entry point into the app
// It just mounts our component to the <body>
// Because we defined it as `fn App`, we can now use it in a
// template as <App/>
fn main() {
leptos::mount_to_body(|| view! { <App/> })
}
```
</details>
</preview>

View File

@@ -38,7 +38,7 @@ special knowledge.
For example, lets start with a simple signal and derived signal:
```rust
let (value, set_value) = create_signal(cx, 0);
let (value, set_value) = create_signal(0);
let is_odd = move || value() & 1 == 1;
```
@@ -54,7 +54,7 @@ Lets say I want to render some text if the number is odd, and some other text
if its even. Well, how about this?
```rust
view! { cx,
view! {
<p>
{move || if is_odd() {
"Odd"
@@ -81,7 +81,7 @@ let message = move || {
}
};
view! { cx,
view! {
<p>{message}</p>
}
```
@@ -90,7 +90,7 @@ This works fine. We can make it a little shorter if wed like, using `bool::th
```rust
let message = move || is_odd().then(|| "Ding ding ding!");
view! { cx,
view! {
<p>{message}</p>
}
```
@@ -112,7 +112,7 @@ let message = move || {
_ => "Even"
}
};
view! { cx,
view! {
<p>{message}</p>
}
```
@@ -131,7 +131,7 @@ above, where the value switches from even to odd on every change, this is fine.
But consider the following example:
```rust
let (value, set_value) = create_signal(cx, 0);
let (value, set_value) = create_signal(0);
let message = move || if value() > 5 {
"Big"
@@ -139,7 +139,7 @@ let message = move || if value() > 5 {
"Small"
};
view! { cx,
view! {
<p>{message}</p>
}
```
@@ -148,10 +148,10 @@ This _works_, for sure. But if you added a log, you might be surprised
```rust
let message = move || if value() > 5 {
log!("{}: rendering Big", value());
logging::log!("{}: rendering Big", value());
"Big"
} else {
log!("{}: rendering Small", value());
logging::log!("{}: rendering Small", value());
"Small"
};
```
@@ -194,12 +194,12 @@ the answer. You pass it a `when` condition function, a `fallback` to be shown if
the `when` function returns `false`, and children to be rendered if `when` is `true`.
```rust
let (value, set_value) = create_signal(cx, 0);
let (value, set_value) = create_signal(0);
view! { cx,
view! {
<Show
when=move || value() > 5
fallback=|cx| view! { cx, <Small/> }
when=move || { value() > 5 }
fallback=|| view! { <Small/> }
>
<Big/>
</Show>
@@ -208,7 +208,8 @@ view! { cx,
`<Show/>` memoizes the `when` condition, so it only renders its `<Small/>` once,
continuing to show the same component until `value` is greater than five;
then it renders `<Big/>` once, continuing to show it indefinitely.
then it renders `<Big/>` once, continuing to show it indefinitely or until `value`
goes below five and then renders `<Small/>` again.
This is a helpful tool to avoid rerendering when using dynamic `if` expressions.
As always, there's some overhead: for a very simple node (like updating a single
@@ -227,19 +228,19 @@ can be a little annoying if youre returning different HTML elements from
different branches of a conditional:
```rust,compile_error
view! { cx,
view! {
<main>
{move || match is_odd() {
true if value() == 1 => {
// returns HtmlElement<Pre>
view! { cx, <pre>"One"</pre> }
view! { <pre>"One"</pre> }
},
false if value() == 2 => {
// returns HtmlElement<P>
view! { cx, <p>"Two"</p> }
view! { <p>"Two"</p> }
}
// returns HtmlElement<Textarea>
_ => view! { cx, <textarea>{value()}</textarea> }
_ => view! { <textarea>{value()}</textarea> }
}}
</main>
}
@@ -259,24 +260,24 @@ to get yourself out of this situation:
1. If you have multiple `HtmlElement` types, convert them to `HtmlElement<AnyElement>`
with [`.into_any()`](https://docs.rs/leptos/latest/leptos/struct.HtmlElement.html#method.into_any)
2. If you have a variety of view types that are not all `HtmlElement`, convert them to
`View`s with [`.into_view(cx)`](https://docs.rs/leptos/latest/leptos/trait.IntoView.html#tymethod.into_view).
`View`s with [`.into_view()`](https://docs.rs/leptos/latest/leptos/trait.IntoView.html#tymethod.into_view).
Heres the same example, with the conversion added:
```rust,compile_error
view! { cx,
view! {
<main>
{move || match is_odd() {
true if value() == 1 => {
// returns HtmlElement<Pre>
view! { cx, <pre>"One"</pre> }.into_any()
view! { <pre>"One"</pre> }.into_any()
},
false if value() == 2 => {
// returns HtmlElement<P>
view! { cx, <p>"Two"</p> }.into_any()
view! { <p>"Two"</p> }.into_any()
}
// returns HtmlElement<Textarea>
_ => view! { cx, <textarea>{value()}</textarea> }.into_any()
_ => view! { <textarea>{value()}</textarea> }.into_any()
}}
</main>
}
@@ -285,3 +286,100 @@ view! { cx,
[Click to open CodeSandbox.](https://codesandbox.io/p/sandbox/6-control-flow-in-view-zttwfx?file=%2Fsrc%2Fmain.rs&selection=%5B%7B%22endColumn%22%3A1%2C%22endLineNumber%22%3A2%2C%22startColumn%22%3A1%2C%22startLineNumber%22%3A2%7D%5D)
<iframe src="https://codesandbox.io/p/sandbox/6-control-flow-in-view-zttwfx?file=%2Fsrc%2Fmain.rs&selection=%5B%7B%22endColumn%22%3A1%2C%22endLineNumber%22%3A2%2C%22startColumn%22%3A1%2C%22startLineNumber%22%3A2%7D%5D" width="100%" height="1000px" style="max-height: 100vh"></iframe>
<details>
<summary>CodeSandbox Source</summary>
```rust
use leptos::*;
#[component]
fn App() -> impl IntoView {
let (value, set_value) = create_signal(0);
let is_odd = move || value() & 1 == 1;
let odd_text = move || if is_odd() { Some("How odd!") } else { None };
view! {
<h1>"Control Flow"</h1>
// Simple UI to update and show a value
<button on:click=move |_| set_value.update(|n| *n += 1)>
"+1"
</button>
<p>"Value is: " {value}</p>
<hr/>
<h2><code>"Option<T>"</code></h2>
// For any `T` that implements `IntoView`,
// so does `Option<T>`
<p>{odd_text}</p>
// This means you can use `Option` methods on it
<p>{move || odd_text().map(|text| text.len())}</p>
<h2>"Conditional Logic"</h2>
// You can do dynamic conditional if-then-else
// logic in several ways
//
// a. An "if" expression in a function
// This will simply re-render every time the value
// changes, which makes it good for lightweight UI
<p>
{move || if is_odd() {
"Odd"
} else {
"Even"
}}
</p>
// b. Toggling some kind of class
// This is smart for an element that's going to
// toggled often, because it doesn't destroy
// it in between states
// (you can find the `hidden` class in `index.html`)
<p class:hidden=is_odd>"Appears if even."</p>
// c. The <Show/> component
// This only renders the fallback and the child
// once, lazily, and toggles between them when
// needed. This makes it more efficient in many cases
// than a {move || if ...} block
<Show when=is_odd
fallback=|| view! { <p>"Even steven"</p> }
>
<p>"Oddment"</p>
</Show>
// d. Because `bool::then()` converts a `bool` to
// `Option`, you can use it to create a show/hide toggled
{move || is_odd().then(|| view! { <p>"Oddity!"</p> })}
<h2>"Converting between Types"</h2>
// e. Note: if branches return different types,
// you can convert between them with
// `.into_any()` (for different HTML element types)
// or `.into_view()` (for all view types)
{move || match is_odd() {
true if value() == 1 => {
// <pre> returns HtmlElement<Pre>
view! { <pre>"One"</pre> }.into_any()
},
false if value() == 2 => {
// <p> returns HtmlElement<P>
// so we convert into a more generic type
view! { <p>"Two"</p> }.into_any()
}
_ => view! { <textarea>{value()}</textarea> }.into_any()
}}
}
}
fn main() {
leptos::mount_to_body(|| view! { <App/> })
}
```
</details>
</preview>

View File

@@ -10,13 +10,13 @@ Lets start with a simple component to capture a number input.
```rust
#[component]
fn NumericInput(cx: Scope) -> impl IntoView {
let (value, set_value) = create_signal(cx, Ok(0));
fn NumericInput() -> impl IntoView {
let (value, set_value) = create_signal(Ok(0));
// when input changes, try to parse a number from the input
let on_input = move |ev| set_value(event_target_value(&ev).parse::<i32>());
view! { cx,
view! {
<label>
"Type a number (or not!)"
<input type="number" on:input=on_input/>
@@ -60,27 +60,27 @@ Lets add an `<ErrorBoundary/>` to this example.
```rust
#[component]
fn NumericInput(cx: Scope) -> impl IntoView {
let (value, set_value) = create_signal(cx, Ok(0));
fn NumericInput() -> impl IntoView {
let (value, set_value) = create_signal(Ok(0));
let on_input = move |ev| set_value(event_target_value(&ev).parse::<i32>());
view! { cx,
view! {
<h1>"Error Handling"</h1>
<label>
"Type a number (or something that's not a number!)"
<input type="number" on:input=on_input/>
<ErrorBoundary
// the fallback receives a signal containing current errors
fallback=|cx, errors| view! { cx,
fallback=|errors| view! {
<div class="error">
<p>"Not a number! Errors: "</p>
// we can render a list of errors as strings, if we'd like
<ul>
{move || errors.get()
.into_iter()
.map(|(_, e)| view! { cx, <li>{e.to_string()}</li>})
.collect_view(cx)
.map(|(_, e)| view! { <li>{e.to_string()}</li>})
.collect_view()
}
</ul>
</div>
@@ -113,3 +113,64 @@ an `<ErrorBoundary/>` will appear again.
[Click to open CodeSandbox.](https://codesandbox.io/p/sandbox/7-error-handling-and-error-boundaries-sroncx?file=%2Fsrc%2Fmain.rs&selection=%5B%7B%22endColumn%22%3A1%2C%22endLineNumber%22%3A2%2C%22startColumn%22%3A1%2C%22startLineNumber%22%3A2%7D%5D)
<iframe src="https://codesandbox.io/p/sandbox/7-error-handling-and-error-boundaries-sroncx?file=%2Fsrc%2Fmain.rs&selection=%5B%7B%22endColumn%22%3A1%2C%22endLineNumber%22%3A2%2C%22startColumn%22%3A1%2C%22startLineNumber%22%3A2%7D%5D" width="100%" height="1000px" style="max-height: 100vh"></iframe>
<details>
<summary>CodeSandbox Source</summary>
```rust
use leptos::*;
#[component]
fn App() -> impl IntoView {
let (value, set_value) = create_signal(Ok(0));
// when input changes, try to parse a number from the input
let on_input = move |ev| set_value(event_target_value(&ev).parse::<i32>());
view! {
<h1>"Error Handling"</h1>
<label>
"Type a number (or something that's not a number!)"
<input type="number" on:input=on_input/>
// If an `Err(_) had been rendered inside the <ErrorBoundary/>,
// the fallback will be displayed. Otherwise, the children of the
// <ErrorBoundary/> will be displayed.
<ErrorBoundary
// the fallback receives a signal containing current errors
fallback=|errors| view! {
<div class="error">
<p>"Not a number! Errors: "</p>
// we can render a list of errors
// as strings, if we'd like
<ul>
{move || errors.get()
.into_iter()
.map(|(_, e)| view! { <li>{e.to_string()}</li>})
.collect::<Vec<_>>()
}
</ul>
</div>
}
>
<p>
"You entered "
// because `value` is `Result<i32, _>`,
// it will render the `i32` if it is `Ok`,
// and render nothing and trigger the error boundary
// if it is `Err`. It's a signal, so this will dynamically
// update when `value` changes
<strong>{value}</strong>
</p>
</ErrorBoundary>
</label>
}
}
fn main() {
leptos::mount_to_body(|| view! { <App/> })
}
```
</details>
</preview>

View File

@@ -29,17 +29,17 @@ it in the child. This lets you manipulate the state of the parent from the child
```rust
#[component]
pub fn App(cx: Scope) -> impl IntoView {
let (toggled, set_toggled) = create_signal(cx, false);
view! { cx,
pub fn App() -> impl IntoView {
let (toggled, set_toggled) = create_signal(false);
view! {
<p>"Toggled? " {toggled}</p>
<ButtonA setter=set_toggled/>
}
}
#[component]
pub fn ButtonA(cx: Scope, setter: WriteSignal<bool>) -> impl IntoView {
view! { cx,
pub fn ButtonA(setter: WriteSignal<bool>) -> impl IntoView {
view! {
<button
on:click=move |_| setter.update(|value| *value = !*value)
>
@@ -62,9 +62,9 @@ Another approach would be to pass a callback to the child: say, `on_click`.
```rust
#[component]
pub fn App(cx: Scope) -> impl IntoView {
let (toggled, set_toggled) = create_signal(cx, false);
view! { cx,
pub fn App() -> impl IntoView {
let (toggled, set_toggled) = create_signal(false);
view! {
<p>"Toggled? " {toggled}</p>
<ButtonB on_click=move |_| set_toggled.update(|value| *value = !*value)/>
}
@@ -72,14 +72,11 @@ pub fn App(cx: Scope) -> impl IntoView {
#[component]
pub fn ButtonB<F>(
cx: Scope,
on_click: F,
) -> impl IntoView
pub fn ButtonB<F>(on_click: F) -> impl IntoView
where
F: Fn(MouseEvent) + 'static,
{
view! { cx,
view! {
<button on:click=on_click>
"Toggle"
</button>
@@ -105,9 +102,9 @@ in your `view` macro in `<App/>`.
```rust
#[component]
pub fn App(cx: Scope) -> impl IntoView {
let (toggled, set_toggled) = create_signal(cx, false);
view! { cx,
pub fn App() -> impl IntoView {
let (toggled, set_toggled) = create_signal(false);
view! {
<p>"Toggled? " {toggled}</p>
// note the on:click instead of on_click
// this is the same syntax as an HTML element event listener
@@ -117,8 +114,8 @@ pub fn App(cx: Scope) -> impl IntoView {
#[component]
pub fn ButtonC<F>(cx: Scope) -> impl IntoView {
view! { cx,
pub fn ButtonC<F>() -> impl IntoView {
view! {
<button>"Toggle"</button>
}
}
@@ -141,17 +138,17 @@ tree:
```rust
#[component]
pub fn App(cx: Scope) -> impl IntoView {
let (toggled, set_toggled) = create_signal(cx, false);
view! { cx,
pub fn App() -> impl IntoView {
let (toggled, set_toggled) = create_signal(false);
view! {
<p>"Toggled? " {toggled}</p>
<Layout/>
}
}
#[component]
pub fn Layout(cx: Scope) -> impl IntoView {
view! { cx,
pub fn Layout() -> impl IntoView {
view! {
<header>
<h1>"My Page"</h1>
</header>
@@ -162,8 +159,8 @@ pub fn Layout(cx: Scope) -> impl IntoView {
}
#[component]
pub fn Content(cx: Scope) -> impl IntoView {
view! { cx,
pub fn Content() -> impl IntoView {
view! {
<div class="content">
<ButtonD/>
</div>
@@ -171,7 +168,7 @@ pub fn Content(cx: Scope) -> impl IntoView {
}
#[component]
pub fn ButtonD<F>(cx: Scope) -> impl IntoView {
pub fn ButtonD<F>() -> impl IntoView {
todo!()
}
```
@@ -182,17 +179,17 @@ pass your `WriteSignal` to its props. You could do whats sometimes called
```rust
#[component]
pub fn App(cx: Scope) -> impl IntoView {
let (toggled, set_toggled) = create_signal(cx, false);
view! { cx,
pub fn App() -> impl IntoView {
let (toggled, set_toggled) = create_signal(false);
view! {
<p>"Toggled? " {toggled}</p>
<Layout set_toggled/>
}
}
#[component]
pub fn Layout(cx: Scope, set_toggled: WriteSignal<bool>) -> impl IntoView {
view! { cx,
pub fn Layout(d: WriteSignal<bool>) -> impl IntoView {
view! {
<header>
<h1>"My Page"</h1>
</header>
@@ -203,8 +200,8 @@ pub fn Layout(cx: Scope, set_toggled: WriteSignal<bool>) -> impl IntoView {
}
#[component]
pub fn Content(cx: Scope, set_toggled: WriteSignal<bool>) -> impl IntoView {
view! { cx,
pub fn Content(d: WriteSignal<bool>) -> impl IntoView {
view! {
<div class="content">
<ButtonD set_toggled/>
</div>
@@ -212,7 +209,7 @@ pub fn Content(cx: Scope, set_toggled: WriteSignal<bool>) -> impl IntoView {
}
#[component]
pub fn ButtonD<F>(cx: Scope, set_toggled: WriteSignal<bool>) -> impl IntoView {
pub fn ButtonD<F>(d: WriteSignal<bool>) -> impl IntoView {
todo!()
}
```
@@ -237,13 +234,13 @@ unnecessary prop drilling.
```rust
#[component]
pub fn App(cx: Scope) -> impl IntoView {
let (toggled, set_toggled) = create_signal(cx, false);
pub fn App() -> impl IntoView {
let (toggled, set_toggled) = create_signal(false);
// share `set_toggled` with all children of this component
provide_context(cx, set_toggled);
provide_context(set_toggled);
view! { cx,
view! {
<p>"Toggled? " {toggled}</p>
<Layout/>
}
@@ -252,14 +249,14 @@ pub fn App(cx: Scope) -> impl IntoView {
// <Layout/> and <Content/> omitted
#[component]
pub fn ButtonD(cx: Scope) -> impl IntoView {
pub fn ButtonD() -> impl IntoView {
// use_context searches up the context tree, hoping to
// find a `WriteSignal<bool>`
// in this case, I .expect() because I know I provided it
let setter = use_context::<WriteSignal<bool>>(cx)
let setter = use_context::<WriteSignal<bool>>()
.expect("to have found the setter provided");
view! { cx,
view! {
<button
on:click=move |_| setter.update(|value| *value = !*value)
>
@@ -288,3 +285,150 @@ signals and effects, all the way down.
[Click to open CodeSandbox.](https://codesandbox.io/p/sandbox/8-parent-child-communication-84we8m?file=%2Fsrc%2Fmain.rs&selection=%5B%7B%22endColumn%22%3A1%2C%22endLineNumber%22%3A3%2C%22startColumn%22%3A1%2C%22startLineNumber%22%3A3%7D%5D)
<iframe src="https://codesandbox.io/p/sandbox/8-parent-child-communication-84we8m?file=%2Fsrc%2Fmain.rs&selection=%5B%7B%22endColumn%22%3A1%2C%22endLineNumber%22%3A3%2C%22startColumn%22%3A1%2C%22startLineNumber%22%3A3%7D%5D" width="100%" height="1000px" style="max-height: 100vh"></iframe>
<details>
<summary>CodeSandbox Source</summary>
```rust
use leptos::{ev::MouseEvent, *};
// This highlights four different ways that child components can communicate
// with their parent:
// 1) <ButtonA/>: passing a WriteSignal as one of the child component props,
// for the child component to write into and the parent to read
// 2) <ButtonB/>: passing a closure as one of the child component props, for
// the child component to call
// 3) <ButtonC/>: adding an `on:` event listener to a component
// 4) <ButtonD/>: providing a context that is used in the component (rather than prop drilling)
#[derive(Copy, Clone)]
struct SmallcapsContext(WriteSignal<bool>);
#[component]
pub fn App() -> impl IntoView {
// just some signals to toggle three classes on our <p>
let (red, set_red) = create_signal(false);
let (right, set_right) = create_signal(false);
let (italics, set_italics) = create_signal(false);
let (smallcaps, set_smallcaps) = create_signal(false);
// the newtype pattern isn't *necessary* here but is a good practice
// it avoids confusion with other possible future `WriteSignal<bool>` contexts
// and makes it easier to refer to it in ButtonC
provide_context(SmallcapsContext(set_smallcaps));
view! {
<main>
<p
// class: attributes take F: Fn() => bool, and these signals all implement Fn()
class:red=red
class:right=right
class:italics=italics
class:smallcaps=smallcaps
>
"Lorem ipsum sit dolor amet."
</p>
// Button A: pass the signal setter
<ButtonA setter=set_red/>
// Button B: pass a closure
<ButtonB on_click=move |_| set_right.update(|value| *value = !*value)/>
// Button B: use a regular event listener
// setting an event listener on a component like this applies it
// to each of the top-level elements the component returns
<ButtonC on:click=move |_| set_italics.update(|value| *value = !*value)/>
// Button D gets its setter from context rather than props
<ButtonD/>
</main>
}
}
/// Button A receives a signal setter and updates the signal itself
#[component]
pub fn ButtonA(
/// Signal that will be toggled when the button is clicked.
setter: WriteSignal<bool>,
) -> impl IntoView {
view! {
<button
on:click=move |_| setter.update(|value| *value = !*value)
>
"Toggle Red"
</button>
}
}
/// Button B receives a closure
#[component]
pub fn ButtonB<F>(
/// Callback that will be invoked when the button is clicked.
on_click: F,
) -> impl IntoView
where
F: Fn(MouseEvent) + 'static,
{
view! {
<button
on:click=on_click
>
"Toggle Right"
</button>
}
// just a note: in an ordinary function ButtonB could take on_click: impl Fn(MouseEvent) + 'static
// and save you from typing out the generic
// the component macro actually expands to define a
//
// struct ButtonBProps<F> where F: Fn(MouseEvent) + 'static {
// on_click: F
// }
//
// this is what allows us to have named props in our component invocation,
// instead of an ordered list of function arguments
// if Rust ever had named function arguments we could drop this requirement
}
/// Button C is a dummy: it renders a button but doesn't handle
/// its click. Instead, the parent component adds an event listener.
#[component]
pub fn ButtonC() -> impl IntoView {
view! {
<button>
"Toggle Italics"
</button>
}
}
/// Button D is very similar to Button A, but instead of passing the setter as a prop
/// we get it from the context
#[component]
pub fn ButtonD() -> impl IntoView {
let setter = use_context::<SmallcapsContext>().unwrap().0;
view! {
<button
on:click=move |_| setter.update(|value| *value = !*value)
>
"Toggle Small Caps"
</button>
}
}
fn main() {
leptos::mount_to_body(|| view! { <App/> })
}
```
</details>
</preview>

View File

@@ -5,7 +5,7 @@ children into an HTML element. For example, imagine I have a `<FancyForm/>` comp
that enhances an HTML `<form>`. I need some way to pass all its inputs.
```rust
view! { cx,
view! {
<Form>
<fieldset>
<label>
@@ -28,12 +28,12 @@ other components:
In fact, youve already seen these both in action in the [`<Show/>`](/view/06_control_flow.html#show) component:
```rust
view! { cx,
view! {
<Show
// `when` is a normal prop
when=move || value() > 5
// `fallback` is a "render prop": a function that returns a view
fallback=|cx| view! { cx, <Small/> }
fallback=|| view! { <Small/> }
>
// `<Big/>` (and anything else here)
// will be given to the `children` prop
@@ -47,7 +47,6 @@ Lets define a component that takes some children and a render prop.
```rust
#[component]
pub fn TakesChildren<F, IV>(
cx: Scope,
/// Takes a function (type F) that returns anything that can be
/// converted into a View (type IV)
render_prop: F,
@@ -58,19 +57,19 @@ where
F: Fn() -> IV,
IV: IntoView,
{
view! { cx,
view! {
<h2>"Render Prop"</h2>
{render_prop()}
<h2>"Children"</h2>
{children(cx)}
{children()}
}
}
```
`render_prop` and `children` are both functions, so we can call them to generate
the appropriate views. `children`, in particular, is an alias for
`Box<dyn FnOnce(Scope) -> Fragment>`. (Aren't you glad we named it `Children` instead?)
`Box<dyn FnOnce() -> Fragment>`. (Aren't you glad we named it `Children` instead?)
> If you need a `Fn` or `FnMut` here because you need to call `children` more than once,
> we also provide `ChildrenFn` and `ChildrenMut` aliases.
@@ -78,8 +77,8 @@ the appropriate views. `children`, in particular, is an alias for
We can use the component like this:
```rust
view! { cx,
<TakesChildren render_prop=|| view! { cx, <p>"Hi, there!"</p> }>
view! {
<TakesChildren render_prop=|| view! { <p>"Hi, there!"</p> }>
// these get passed to `children`
"Some text"
<span>"A span"</span>
@@ -97,15 +96,15 @@ a component that takes its children and turns them into an unordered list.
```rust
#[component]
pub fn WrapsChildren(cx: Scope, children: Children) -> impl IntoView {
pub fn WrapsChildren(Children) -> impl IntoView {
// Fragment has `nodes` field that contains a Vec<View>
let children = children(cx)
let children = children()
.nodes
.into_iter()
.map(|child| view! { cx, <li>{child}</li> })
.collect_view(cx);
.map(|child| view! { <li>{child}</li> })
.collect_view();
view! { cx,
view! {
<ul>{children}</ul>
}
}
@@ -114,15 +113,119 @@ pub fn WrapsChildren(cx: Scope, children: Children) -> impl IntoView {
Calling it like this will create a list:
```rust
view! { cx,
<WrappedChildren>
view! {
<WrapsChildren>
"A"
"B"
"C"
</WrappedChildren>
</WrapsChildren>
}
```
[Click to open CodeSandbox.](https://codesandbox.io/p/sandbox/9-component-children-2wrdfd?file=%2Fsrc%2Fmain.rs&selection=%5B%7B%22endColumn%22%3A12%2C%22endLineNumber%22%3A19%2C%22startColumn%22%3A12%2C%22startLineNumber%22%3A19%7D%5D)
<iframe src="https://codesandbox.io/p/sandbox/9-component-children-2wrdfd?file=%2Fsrc%2Fmain.rs&selection=%5B%7B%22endColumn%22%3A12%2C%22endLineNumber%22%3A19%2C%22startColumn%22%3A12%2C%22startLineNumber%22%3A19%7D%5D" width="100%" height="1000px" style="max-height: 100vh"></iframe>
<details>
<summary>CodeSandbox Source</summary>
```rust
use leptos::*;
// Often, you want to pass some kind of child view to another
// component. There are two basic patterns for doing this:
// - "render props": creating a component prop that takes a function
// that creates a view
// - the `children` prop: a special property that contains content
// passed as the children of a component in your view, not as a
// property
#[component]
pub fn App() -> impl IntoView {
let (items, set_items) = create_signal(vec![0, 1, 2]);
let render_prop = move || {
// items.with(...) reacts to the value without cloning
// by applying a function. Here, we pass the `len` method
// on a `Vec<_>` directly
let len = move || items.with(Vec::len);
view! {
<p>"Length: " {len}</p>
}
};
view! {
// This component just displays the two kinds of children,
// embedding them in some other markup
<TakesChildren
// for component props, you can shorthand
// `render_prop=render_prop` => `render_prop`
// (this doesn't work for HTML element attributes)
render_prop
>
// these look just like the children of an HTML element
<p>"Here's a child."</p>
<p>"Here's another child."</p>
</TakesChildren>
<hr/>
// This component actually iterates over and wraps the children
<WrapsChildren>
<p>"Here's a child."</p>
<p>"Here's another child."</p>
</WrapsChildren>
}
}
/// Displays a `render_prop` and some children within markup.
#[component]
pub fn TakesChildren<F, IV>(
/// Takes a function (type F) that returns anything that can be
/// converted into a View (type IV)
render_prop: F,
/// `children` takes the `Children` type
/// this is an alias for `Box<dyn FnOnce() -> Fragment>`
/// ... aren't you glad we named it `Children` instead?
children: Children,
) -> impl IntoView
where
F: Fn() -> IV,
IV: IntoView,
{
view! {
<h1><code>"<TakesChildren/>"</code></h1>
<h2>"Render Prop"</h2>
{render_prop()}
<hr/>
<h2>"Children"</h2>
{children()}
}
}
/// Wraps each child in an `<li>` and embeds them in a `<ul>`.
#[component]
pub fn WrapsChildren(Children) -> impl IntoView {
// children() returns a `Fragment`, which has a
// `nodes` field that contains a Vec<View>
// this means we can iterate over the children
// to create something new!
let children = children()
.nodes
.into_iter()
.map(|child| view! { <li>{child}</li> })
.collect::<Vec<_>>();
view! {
<h1><code>"<WrapsChildren/>"</code></h1>
// wrap our wrapped children in a UL
<ul>{children}</ul>
}
}
fn main() {
leptos::mount_to_body(|| view! { <App/> })
}
```
</details>
</preview>

View File

@@ -0,0 +1,98 @@
# No Macros: The View Builder Syntax
> If youre perfectly happy with the `view!` macro syntax described so far, youre welcome to skip this chapter. The builder syntax described in this section is always available, but never required.
For one reason or another, many developers would prefer to avoid macros. Perhaps you dont like the limited `rustfmt` support. (Although, you should check out [`leptosfmt`](https://github.com/bram209/leptosfmt), which is an excellent tool!) Perhaps you worry about the effect of macros on compile time. Perhaps you prefer the aesthetics of pure Rust syntax, or you have trouble context-switching between an HTML-like syntax and your Rust code. Or perhaps you want more flexibility in how you create and manipulate HTML elements than the `view` macro provides.
If you fall into any of those camps, the builder syntax may be for you.
The `view` macro expands an HTML-like syntax to a series of Rust functions and method calls. If youd rather not use the `view` macro, you can simply use that expanded syntax yourself. And its actually pretty nice!
First off, if you want you can even drop the `#[component]` macro: a component is just a setup function that creates your view, so you can define a component as a simple function call:
```rust
pub fn counter(initial_value: i32, step: u32) -> impl IntoView { }
```
Elements are created by calling a function with the same name as the HTML element:
```rust
p()
```
You can add children to the element with [`.child()`](https://docs.rs/leptos/latest/leptos/struct.HtmlElement.html#method.child), which takes a single child or a tuple or array of types that implement [`IntoView`](https://docs.rs/leptos/latest/leptos/trait.IntoView.html).
```rust
p().child((em().child("Big, "), strong().child("bold "), "text"))
```
Attributes are added with [`.attr()`](https://docs.rs/leptos/latest/leptos/struct.HtmlElement.html#method.attr). This can take any of the same types that you could pass as an attribute into the view macro (types that implement [`IntoAttribute`](https://docs.rs/leptos/latest/leptos/trait.IntoAttribute.html)).
```rust
p().attr("id", "foo").attr("data-count", move || count().to_string())
```
Similarly, the `class:`, `prop:`, and `style:` syntaxes map directly onto [`.class()`](https://docs.rs/leptos/latest/leptos/struct.HtmlElement.html#method.class), [`.prop()`](https://docs.rs/leptos/latest/leptos/struct.HtmlElement.html#method.prop), and [`.style()`](https://docs.rs/leptos/latest/leptos/struct.HtmlElement.html#method.style) methods.
Event listeners can be added with [`.on()`](https://docs.rs/leptos/latest/leptos/struct.HtmlElement.html#method.on). Typed events found in [`leptos::ev`](https://docs.rs/leptos/latest/leptos/ev/index.html) prevent typos in event names and allow for correct type inference in the callback function.
```rust
button()
.on(ev::click, move |_| set_count.update(|count| count.clear()))
.child("Clear")
```
> Many additional methods can be found in the [`HtmlElement`](https://docs.rs/leptos/latest/leptos/struct.HtmlElement.html#method.child) docs, including some methods that are not directly available in the `view` macro.
All of this adds up to a very Rusty syntax to build full-featured views, if you prefer this style.
```rust
/// A simple counter view.
// A component is really just a function call: it runs once to create the DOM and reactive system
pub fn counter(initial_value: i32, step: u32) -> impl IntoView {
let (count, set_count) = create_signal(0);
div()
.child((
button()
// typed events found in leptos::ev
// 1) prevent typos in event names
// 2) allow for correct type inference in callbacks
.on(ev::click, move |_| set_count.update(|count| count.clear()))
.child("Clear"),
button()
.on(ev::click, move |_| {
set_count.update(|count| count.decrease())
})
.child("-1"),
span().child(("Value: ", move || count.get().value(), "!")),
button()
.on(ev::click, move |_| {
set_count.update(|count| count.increase())
})
.child("+1"),
))
}
```
This also has the benefit of being more flexible: because these are all plain Rust functions and methods, its easier to use them in things like iterator adapters without any additional “magic”:
```rust
// take some set of attribute names and values
let attrs: Vec<(&str, AttributeValue)> = todo!();
// you can use the builder syntax to “spread” these onto the
// element in a way thats not possible with the view macro
let p = attrs
.into_iter()
.fold(p(), |el, (name, value)| el.attr(name, value));
```
> ## Performance Note
>
> One caveat: the `view` macro applies significant optimizations in server-side-rendering (SSR) mode to improve HTML rendering performance significantly (think 2-4x faster, depending on the characteristics of any given app). It does this by analyzing your `view` at compile time and converting the static parts into simple HTML strings, rather than expanding them into the builder syntax.
>
> This means two things:
>
> 1. The builder syntax and `view` macro should not be mixed, or should only be mixed very carefully: at least in SSR mode, the output of the `view` should be treated as a “black box” that cant have additional builder methods applied to it without causing inconsistencies.
> 2. Using the builder syntax will result in less-than-optimal SSR performance. It wont be slow, by any means (and its worth running your own benchmarks in any case), just slower than the `view`-optimized version.

View File

@@ -5,32 +5,35 @@ CARGO_MAKE_EXTEND_WORKSPACE_MAKEFILE = true
CARGO_MAKE_CARGO_BUILD_TEST_FLAGS = ""
CARGO_MAKE_WORKSPACE_EMULATION = true
CARGO_MAKE_CRATE_WORKSPACE_MEMBERS = [
"counter",
"counter_isomorphic",
"counters",
"counters_stable",
"counter_without_macros",
"error_boundary",
"errors_axum",
"fetch",
"hackernews",
"hackernews_axum",
"js-framework-benchmark",
"leptos-tailwind-axum",
"login_with_token_csr_only",
"parent_child",
"router",
"session_auth_axum",
"slots",
"ssr_modes",
"ssr_modes_axum",
"tailwind",
"tailwind_csr_trunk",
"timer",
"todo_app_sqlite",
"todo_app_sqlite_axum",
"todo_app_sqlite_viz",
"todomvc",
"animated_show",
"counter",
"counter_isomorphic",
"counters",
"counters_stable",
"counter_url_query",
"counter_without_macros",
"error_boundary",
"errors_axum",
"fetch",
"hackernews",
"hackernews_axum",
"js-framework-benchmark",
"leptos-tailwind-axum",
"login_with_token_csr_only",
"parent_child",
"router",
"session_auth_axum",
"slots",
"ssr_modes",
"ssr_modes_axum",
"suspense_tests",
"tailwind",
"tailwind_csr_trunk",
"timer",
"todo_app_sqlite",
"todo_app_sqlite_axum",
"todo_app_sqlite_viz",
"todomvc",
]
[tasks.gen-members]
@@ -45,3 +48,106 @@ grep -v gtk |
jq -R -s -c 'split("\n")[:-1]')
echo "CARGO_MAKE_CRATE_WORKSPACE_MEMBERS = $examples"
'''
[tasks.test-report]
workspace = false
description = "report web testing technology used by examples - OPTION: [all]"
script = '''
set -emu
BOLD="\e[1m"
GREEN="\e[0;32m"
ITALIC="\e[3m"
YELLOW="\e[0;33m"
RESET="\e[0m"
echo
echo "${YELLOW}Web Test Technology${RESET}"
echo
makefile_paths=$(find . -name Makefile.toml -not -path '*/target/*' -not -path '*/node_modules/*' |
sed 's%./%%' |
sed 's%/Makefile.toml%%' |
grep -v Makefile.toml |
sort -u)
start_path=$(pwd)
for path in $makefile_paths; do
cd $path
crate_symbols=
pw_count=$(find . -name playwright.config.ts | wc -l)
while read -r line; do
case $line in
*"cucumber"*)
crate_symbols=$crate_symbols"C"
;;
*"fantoccini"*)
crate_symbols=$crate_symbols"D"
;;
esac
done <"./Cargo.toml"
while read -r line; do
case $line in
*"cargo-make/wasm-test.toml"*)
crate_symbols=$crate_symbols"W"
;;
*"cargo-make/playwright-test.toml"*)
crate_symbols=$crate_symbols"P"
crate_symbols=$crate_symbols"N"
;;
*"cargo-make/playwright-trunk-test.toml"*)
crate_symbols=$crate_symbols"P"
crate_symbols=$crate_symbols"T"
;;
*"cargo-make/trunk_server.toml"*)
crate_symbols=$crate_symbols"T"
;;
*"cargo-make/cargo-leptos-webdriver-test.toml"*)
crate_symbols=$crate_symbols"L"
;;
*"cargo-make/cargo-leptos-test.toml"*)
crate_symbols=$crate_symbols"L"
if [ $pw_count -gt 0 ]; then
crate_symbols=$crate_symbols"P"
fi
;;
esac
done <"./Makefile.toml"
# Sort list of tools
sorted_crate_symbols=$(echo ${crate_symbols} | grep -o . | sort | tr -d "\n")
formatted_crate_symbols="${BOLD}${YELLOW}${sorted_crate_symbols}${RESET}"
crate_line=$path
if [ ! -z ${1+x} ]; then
# Show all examples
if [ ! -z $crate_symbols ]; then
crate_line=$crate_line$formatted_crate_symbols
fi
echo $crate_line
elif [ ! -z $crate_symbols ]; then
# Filter out examples that do not run tests in `ci`
crate_line=$crate_line$formatted_crate_symbols
echo $crate_line
fi
cd ${start_path}
done
c="${BOLD}${YELLOW}C${RESET} = Cucumber"
d="${BOLD}${YELLOW}D${RESET} = WebDriver"
l="${BOLD}${YELLOW}L${RESET} = Cargo Leptos"
n="${BOLD}${YELLOW}N${RESET} = Node"
p="${BOLD}${YELLOW}P${RESET} = Playwright"
t="${BOLD}${YELLOW}T${RESET} = Trunk"
w="${BOLD}${YELLOW}W${RESET} = WASM"
echo
echo "${ITALIC}Keys:${RESET} $c, $d, $l, $n, $p, $t, $w"
echo
'''

View File

@@ -4,4 +4,4 @@ The examples in this directory are all built and tested against the current `mai
To the extent that new features have been released or breaking changes have been made since the previous release, the examples are compatible with the `main` branch and not the current release.
To see the examples as they were at the time of the `0.3.0` release, [click here](https://github.com/leptos-rs/leptos/tree/v0.3.0/examples).
To see the examples as they were at the time of the `0.3.0` release, [click here](https://github.com/leptos-rs/leptos/tree/v0.3.0/examples).

View File

@@ -0,0 +1,14 @@
[package]
name = "animated-show"
version = "0.1.0"
edition = "2021"
[profile.release]
codegen-units = 1
lto = true
[dependencies]
leptos = { path = "../../leptos", features = ["csr"] }
console_log = "1"
log = "0.4"
console_error_panic_hook = "0.1.7"

View File

@@ -0,0 +1 @@
extend = [{ path = "../cargo-make/main.toml" }]

View File

@@ -0,0 +1,9 @@
# `<AnimatedShow>` combined with CSS animations
This is a very simple example of the `<AnimatedShow>` component.
This component is an extension for the `<Show>` component and it will not take in a fallback, but it will unmount the
component from the DOM after a given duration. This makes it possible to have really easy unmount animations with just
CSS.
Just execute `trunk serve` to start the demo.

View File

@@ -0,0 +1,42 @@
<!DOCTYPE html>
<html>
<head>
<link data-trunk rel="rust" data-wasm-opt="z"/>
<link data-trunk rel="icon" type="image/ico" href="/public/favicon.ico"/>
<style>
.hover-me {
width: 100px;
margin: 1rem;
padding: 1rem;
text-align: center;
cursor: pointer;
border: 1px solid grey;
}
.here-i-am {
width: 100px;
margin: 1rem;
padding: 1rem;
text-align: center;
color: white;
font-weight: bold;
background: black;
}
@keyframes fade-in {
from { opacity: 0; }
to { opacity: 1; }
}
@keyframes fade-out {
from { opacity: 1; }
to { opacity: 0; }
}
.fade-in-1000 {
animation: 1000ms fade-in forwards;
}
.fade-out-1000 {
animation: 1000ms fade-out forwards;
}
</style>
</head>
<body></body>
</html>

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After

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View File

@@ -0,0 +1,34 @@
use core::time::Duration;
use leptos::*;
#[component]
pub fn App() -> impl IntoView {
let show = create_rw_signal(false);
// the CSS classes in this example are just written directly inside the `index.html`
view! {
<div
class="hover-me"
on:mouseenter=move |_| show.set(true)
on:mouseleave=move |_| show.set(false)
>
"Hover Me"
</div>
<AnimatedShow
when=show
// optional CSS class which will be applied if `when == true`
show_class="fade-in-1000"
// optional CSS class which will be applied if `when == false` and before the
// `hide_delay` starts -> makes CSS unmount animations really easy
hide_class="fade-out-1000"
// the given unmount delay which should match your unmount animation duration
hide_delay=Duration::from_millis(1000)
>
// provide any `Children` inside here
<div class="here-i-am">
"Here I Am!"
</div>
</AnimatedShow>
}
}

View File

@@ -0,0 +1,8 @@
use animated_show::App;
use leptos::*;
pub fn main() {
_ = console_log::init_with_level(log::Level::Debug);
console_error_panic_hook::set_once();
mount_to_body(App);
}

View File

@@ -1,5 +1,4 @@
[tasks.test-e2e]
dependencies = ["setup-node", "cargo-leptos-e2e"]
extend = { path = "./cargo-leptos.toml" }
[tasks.clean-all]
dependencies = ["clean-cargo", "clean-node_modules", "clean-playwright"]
[tasks.integration-test]
dependencies = ["install-cargo-leptos", "cargo-leptos-e2e"]

View File

@@ -0,0 +1,7 @@
extend = [
{ path = "./cargo-leptos.toml" },
{ path = "../cargo-make/webdriver.toml" },
]
[tasks.integration-test]
dependencies = ["install-cargo-leptos", "start-webdriver", "cargo-leptos-e2e"]

View File

@@ -0,0 +1,33 @@
extend = { path = "../cargo-make/client-process.toml" }
[tasks.install-cargo-leptos]
install_crate = { crate_name = "cargo-leptos", binary = "cargo-leptos", test_arg = "--help" }
[tasks.cargo-leptos-e2e]
command = "cargo"
args = ["leptos", "end-to-end"]
[tasks.build]
clear = true
command = "cargo"
args = ["leptos", "build"]
[tasks.check]
clear = true
dependencies = ["check-debug", "check-release"]
[tasks.check-debug]
toolchain = "nightly"
command = "cargo"
args = ["check-all-features"]
install_crate = "cargo-all-features"
[tasks.check-release]
toolchain = "nightly"
command = "cargo"
args = ["check-all-features", "--release"]
install_crate = "cargo-all-features"
[tasks.start-client]
command = "cargo"
args = ["leptos", "watch"]

View File

@@ -0,0 +1,29 @@
[tasks.clean]
dependencies = [
"clean-cargo",
"clean-trunk",
"clean-node_modules",
"clean-playwright",
]
[tasks.clean-cargo]
command = "rm"
args = ["-rf", "target"]
[tasks.clean-trunk]
script = '''
find . -type d -name dist | xargs rm -rf
'''
[tasks.clean-node_modules]
script = '''
project_dir=${PWD##*/}
if [ "$project_dir" != "todomvc" ]; then
find . -type d -name node_modules | xargs rm -rf
fi
'''
[tasks.clean-playwright]
script = '''
find . -name playwright-report -name playwright -name test-results | xargs rm -rf
'''

View File

@@ -0,0 +1,35 @@
[tasks.start-client]
[tasks.stop-client]
condition = { env_set = ["CLIENT_PROCESS_NAME"] }
script = '''
if [ ! -z $(pidof ${CLIENT_PROCESS_NAME}) ]; then
pkill -ef ${CLIENT_PROCESS_NAME}
fi
'''
[tasks.client-status]
condition = { env_set = ["CLIENT_PROCESS_NAME"] }
script = '''
if [ -z $(pidof ${CLIENT_PROCESS_NAME}) ]; then
echo " ${CLIENT_PROCESS_NAME} is not running"
else
echo " ${CLIENT_PROCESS_NAME} is up"
fi
'''
[tasks.maybe-start-client]
condition = { env_set = ["CLIENT_PROCESS_NAME"] }
script = '''
if [ -z $(pidof ${CLIENT_PROCESS_NAME}) ]; then
echo " Starting ${CLIENT_PROCESS_NAME}"
cargo make start-client ${@} &
else
echo " ${CLIENT_PROCESS_NAME} is already started"
fi
'''
# ALIASES
[tasks.dev]
alias = "maybe-start-client"

View File

@@ -1,98 +0,0 @@
[tasks.pre-clippy]
env = { CARGO_MAKE_CLIPPY_ARGS = "--all-targets --all-features -- -D warnings" }
[tasks.check-style]
description = "Check for style violations"
dependencies = ["check-format-flow", "clippy-flow"]
[tasks.check-format]
env = { LEPTOS_PROJECT_DIRECTORY = "../../" }
args = ["fmt", "--", "--check", "--config-path", "${LEPTOS_PROJECT_DIRECTORY}"]
[tasks.clean-cargo]
description = "Runs the cargo clean command."
category = "Cleanup"
command = "cargo"
args = ["clean"]
[tasks.clean-trunk]
description = "Runs the trunk clean command."
category = "Cleanup"
command = "trunk"
args = ["clean"]
[tasks.clean-node_modules]
description = "Delete all node_modules directories"
category = "Cleanup"
script = '''
find . -type d -name node_modules | xargs rm -rf
'''
[tasks.clean-playwright]
description = "Delete playwright directories"
category = "Cleanup"
script = '''
for pw_dir in $(find . -name playwright.config.ts | xargs dirname)
do
rm -rf $pw_dir/playwright-report pw_dir/playwright pw_dir/test-results
done
'''
[tasks.clean-all]
description = "Delete all temporary directories"
category = "Cleanup"
dependencies = ["clean-cargo"]
[tasks.test-wasm]
env = { CARGO_MAKE_WASM_TEST_ARGS = "--headless --chrome" }
command = "cargo"
args = ["make", "wasm-pack-test"]
[tasks.cargo-leptos-e2e]
description = "Runs end to end tests with cargo leptos"
command = "cargo"
args = ["leptos", "end-to-end"]
[tasks.setup-node]
description = "Install node dependencies and playwright browsers"
env = { PLAYWRIGHT_SKIP_BROWSER_DOWNLOAD = "1" }
script = '''
BOLD="\e[1m"
GREEN="\e[0;32m"
RED="\e[0;31m"
RESET="\e[0m"
project_dir=$CARGO_MAKE_WORKING_DIRECTORY
# Discover commands
if command -v pnpm; then
NODE_CMD=pnpm
PLAYWRIGHT_CMD=pnpm
elif command -v npm; then
NODE_CMD=npm
PLAYWRIGHT_CMD=npx
else
echo "${RED}${BOLD}ERROR${RESET} - pnpm or npm is required by this task"
exit 1
fi
# Install node dependencies
for node_path in $(find . -name package.json -not -path '*/node_modules/*')
do
node_dir=$(dirname $node_path)
echo Install node dependencies for $node_dir
cd $node_dir
${NODE_CMD} install
cd ${project_dir}
done
# Install playwright browsers
for pw_path in $(find . -name playwright.config.ts)
do
pw_dir=$(dirname $pw_path)
echo Install playwright browsers for $pw_dir
cd $pw_dir
${PLAYWRIGHT_CMD} playwright install
cd $project_dir
done
'''

View File

@@ -0,0 +1,11 @@
[tasks.build]
toolchain = "nightly"
command = "cargo"
args = ["build-all-features"]
install_crate = "cargo-all-features"
[tasks.check]
toolchain = "nightly"
command = "cargo"
args = ["check-all-features"]
install_crate = "cargo-all-features"

View File

@@ -0,0 +1,9 @@
[tasks.pre-clippy]
env = { CARGO_MAKE_CLIPPY_ARGS = "--all-targets --all-features -- -D warnings" }
[tasks.check-style]
dependencies = ["check-format-flow", "clippy-flow"]
[tasks.check-format]
env = { LEPTOS_PROJECT_DIRECTORY = "../../" }
args = ["fmt", "--", "--check", "--config-path", "${LEPTOS_PROJECT_DIRECTORY}"]

View File

@@ -1,35 +1,41 @@
extend = [{ path = "../cargo-make/common.toml" }]
extend = [
{ path = "../cargo-make/compile.toml" },
{ path = "../cargo-make/clean.toml" },
{ path = "../cargo-make/lint.toml" },
{ path = "../cargo-make/node.toml" },
]
# CI Stages
[tasks.ci]
alias = "verify-flow"
dependencies = ["prepare", "lint", "build", "test-flow", "integration-test"]
[tasks.prepare]
dependencies = ["setup-node"]
[tasks.lint]
dependencies = ["check-style"]
[tasks.integration-test]
# Support Local Runs
[tasks.ci-clean]
dependencies = ["ci", "clean"]
[tasks.check-clean]
dependencies = ["check", "clean"]
[tasks.build-clean]
dependencies = ["build", "clean"]
# ALIASES
[tasks.verify-flow]
description = "Provides pre and post hooks for verify"
dependencies = ["pre-verify", "verify", "post-verify"]
alias = "ci"
[tasks.verify]
description = "Run all quality checks and tests"
dependencies = ["check-style", "test-unit-and-e2e"]
[tasks.t]
dependencies = ["test-flow"]
[tasks.test-unit-and-e2e]
description = "Run all unit and e2e tests"
dependencies = ["test-flow", "test-e2e-flow"]
[tasks.pre-verify]
[tasks.post-verify]
dependencies = ["maybe-clean-all"]
[tasks.maybe-clean-all]
description = "Used to clean up locally after call to verify-examples"
condition = { env_true = ["CLEAN_AFTER_VERIFY"] }
[tasks.test-e2e-flow]
description = "Provides pre and post hooks for test-e2e"
dependencies = ["pre-test-e2e", "test-e2e", "post-test-e2e"]
[tasks.pre-test-e2e]
[tasks.test-e2e]
[tasks.post-test-e2e]
[tasks.it]
alias = "integration-test"

View File

@@ -0,0 +1,43 @@
[tasks.setup-node]
description = "Install node dependencies and playwright browsers"
env = { PLAYWRIGHT_SKIP_BROWSER_DOWNLOAD = "1" }
script = '''
BOLD="\e[1m"
GREEN="\e[0;32m"
RED="\e[0;31m"
RESET="\e[0m"
project_dir=$CARGO_MAKE_WORKING_DIRECTORY
# Discover commands
if command -v pnpm; then
NODE_CMD=pnpm
PLAYWRIGHT_CMD=pnpm
elif command -v npm; then
NODE_CMD=npm
PLAYWRIGHT_CMD=npx
else
echo "${RED}${BOLD}ERROR${RESET} - pnpm or npm is required by this task"
exit 1
fi
# Install node dependencies
for node_path in $(find . -name package.json -not -path '*/node_modules/*')
do
node_dir=$(dirname $node_path)
echo Install node dependencies for $node_dir
cd $node_dir
${NODE_CMD} install
cd ${project_dir}
done
# Install playwright browsers
for pw_path in $(find . -name playwright.config.ts)
do
pw_dir=$(dirname $pw_path)
echo Install playwright browsers for $pw_dir
cd $pw_dir
${PLAYWRIGHT_CMD} playwright install
cd $project_dir
done
'''

View File

@@ -1,7 +1,4 @@
extend = [{ path = "../cargo-make/playwright.toml" }]
[tasks.test-e2e]
dependencies = ["setup-node", "test-playwright-autostart"]
[tasks.clean-all]
dependencies = ["clean-cargo", "clean-node_modules", "clean-playwright"]
[tasks.integration-test]
dependencies = ["test-playwright-autostart"]

View File

@@ -0,0 +1,17 @@
extend = [
{ path = "../cargo-make/playwright.toml" },
{ path = "../cargo-make/trunk_server.toml" },
]
[tasks.integration-test]
dependencies = [
"maybe-start-client",
"wait-one",
"test-playwright",
"stop-client",
]
[tasks.wait-one]
script = '''
sleep 1
'''

View File

@@ -1,22 +1,8 @@
[tasks.clean-playwright]
description = "Delete playwright directories"
category = "Cleanup"
script = '''
for pw_dir in $(find . -name playwright.config.ts | xargs dirname)
do
rm -rf $pw_dir/playwright-report pw_dir/playwright pw_dir/test-results
done
'''
[tasks.test-playwright-autostart]
description = "Run playwright test with server autostart"
category = "Test"
command = "npm"
args = ["run", "e2e:auto-start"]
[tasks.test-playwright]
description = "Run playwright test"
category = "Test"
script = '''
BOLD="\e[1m"
GREEN="\e[0;32m"
@@ -46,8 +32,6 @@ done
'''
[tasks.test-playwright-ui]
description = "Run playwright test --ui"
category = "Test"
script = '''
BOLD="\e[1m"
GREEN="\e[0;32m"
@@ -77,8 +61,6 @@ done
'''
[tasks.test-playwright-report]
description = "Run playwright show-report"
category = "Test"
script = '''
BOLD="\e[1m"
GREEN="\e[0;32m"

View File

@@ -1,22 +1,12 @@
extend = { path = "../cargo-make/client-process.toml" }
[env]
CLIENT_PROCESS_NAME = "trunk"
[tasks.build]
command = "trunk"
args = ["build"]
[tasks.clean-trunk]
[tasks.start-client]
command = "trunk"
args = ["clean"]
[tasks.start-trunk]
command = "trunk"
args = ["serve", "--open"]
[tasks.stop-trunk]
script = '''
pkill -f "cargo-make"
pkill -f "trunk"
'''
# ALIASES
[tasks.dev]
dependencies = ["start-trunk"]
args = ["serve", "${@}"]

View File

@@ -5,5 +5,7 @@ condition = { env_true = ["RUN_CARGO_TEST"] }
[tasks.post-test]
dependencies = ["test-wasm"]
[tasks.clean-all]
dependencies = ["clean-cargo", "clean-trunk"]
[tasks.test-wasm]
env = { CARGO_MAKE_WASM_TEST_ARGS = "--headless --chrome" }
command = "cargo"
args = ["make", "wasm-pack-test"]

View File

@@ -0,0 +1,30 @@
[tasks.start-webdriver]
script = '''
BOLD="\e[1m"
GREEN="\e[0;32m"
RED="\e[0;31m"
RESET="\e[0m"
if command -v chromedriver; then
if [ -z $(pidof chromedriver) ]; then
chromedriver --port=4444 &
fi
else
echo "${RED}${BOLD}ERROR${RESET} - chromedriver is required by this task"
exit 1
fi
'''
[tasks.stop-webdriver]
script = '''
pkill -f "chromedriver"
'''
[tasks.webdriver-status]
script = '''
if [ -z $(pidof chromedriver) ]; then
echo chromedriver is not running
else
echo chromedriver is up
fi
'''

View File

@@ -2,13 +2,3 @@ extend = [
{ path = "../cargo-make/main.toml" },
{ path = "../cargo-make/wasm-test.toml" },
]
[tasks.build]
command = "cargo"
args = ["+nightly", "build-all-features"]
install_crate = "cargo-all-features"
[tasks.check]
command = "cargo"
args = ["+nightly", "check-all-features"]
install_crate = "cargo-all-features"

View File

@@ -1,24 +1,32 @@
use leptos::*;
use leptos::{SignalWrite, *};
use std::cell::{Ref, RefMut};
/// A simple counter component.
///
/// You can use doc comments like this to document your component.
#[component]
pub fn SimpleCounter(
cx: Scope,
/// The starting value for the counter
initial_value: i32,
/// The change that should be applied each time the button is clicked.
step: i32,
) -> impl IntoView {
let (value, set_value) = create_signal(cx, initial_value);
let (value, set_value) = create_signal(initial_value);
view! { cx,
let something: Ref<'_, i32> = value.read();
spawn_local(async move {
let mut something_else: RefMut<'_, i32> = set_value.write();
async {}.await;
*something_else = 30;
});
view! {
<div>
<button on:click=move |_| set_value(0)>"Clear"</button>
<button on:click=move |_| set_value.update(|value| *value -= step)>"-1"</button>
<button on:click=move |_| *set_value.write() -= step>"-1"</button>
<span>"Value: " {value} "!"</span>
<button on:click=move |_| set_value.update(|value| *value += step)>"+1"</button>
<button on:click=move |_| *set_value.write() += step>"+1"</button>
</div>
}
}

View File

@@ -4,8 +4,8 @@ use leptos::*;
pub fn main() {
_ = console_log::init_with_level(log::Level::Debug);
console_error_panic_hook::set_once();
mount_to_body(|cx| {
view! { cx,
mount_to_body(|| {
view! {
<SimpleCounter
initial_value=0
step=1

View File

@@ -15,7 +15,7 @@ fn clear() {
// note that we start at the initial value of 10
mount_to(
test_wrapper.clone().unchecked_into(),
|cx| view! { cx, <SimpleCounter initial_value=10 step=1/> },
|| view! { <SimpleCounter initial_value=10 step=1/> },
);
// now we extract the buttons by iterating over the DOM
@@ -32,16 +32,17 @@ fn clear() {
// now let's test the <div> against the expected value
// we can do this by testing its `outerHTML`
let runtime = create_runtime();
assert_eq!(
div.outer_html(),
// here we spawn a mini reactive system, just to render the
// test case
run_scope(create_runtime(), |cx| {
{
// it's as if we're creating it with a value of 0, right?
let (value, _set_value) = create_signal(cx, 0);
let (value, _set_value) = create_signal(0);
// we can remove the event listeners because they're not rendered to HTML
view! { cx,
view! {
<div>
<button>"Clear"</button>
<button>"-1"</button>
@@ -52,7 +53,7 @@ fn clear() {
// the view returned an HtmlElement<Div>, which is a smart pointer for
// a DOM element. So we can still just call .outer_html()
.outer_html()
})
}
);
// There's actually an easier way to do this...
@@ -61,10 +62,12 @@ fn clear() {
let comparison_wrapper = document.create_element("section").unwrap();
leptos::mount_to(
comparison_wrapper.clone().unchecked_into(),
|cx| view! { cx, <SimpleCounter initial_value=0 step=1/>},
|| view! { <SimpleCounter initial_value=0 step=1/>},
);
comparison_wrapper.inner_html()
});
runtime.dispose();
}
#[wasm_bindgen_test]
@@ -75,7 +78,7 @@ fn inc() {
mount_to(
test_wrapper.clone().unchecked_into(),
|cx| view! { cx, <SimpleCounter initial_value=0 step=1/> },
|| view! { <SimpleCounter initial_value=0 step=1/> },
);
// You can do testing with vanilla DOM operations
@@ -118,12 +121,14 @@ fn inc() {
assert_eq!(text.text_content(), Some("Value: 0!".to_string()));
let runtime = create_runtime();
// Or you can test against a sample view!
assert_eq!(
div.outer_html(),
run_scope(create_runtime(), |cx| {
let (value, _) = create_signal(cx, 0);
view! { cx,
{
let (value, _) = create_signal(0);
view! {
<div>
<button>"Clear"</button>
<button>"-1"</button>
@@ -132,17 +137,17 @@ fn inc() {
</div>
}
}
.outer_html())
.outer_html()
);
inc.click();
assert_eq!(
div.outer_html(),
run_scope(create_runtime(), |cx| {
{
// because we've clicked, it's as if the signal is starting at 1
let (value, _) = create_signal(cx, 1);
view! { cx,
let (value, _) = create_signal(1);
view! {
<div>
<button>"Clear"</button>
<button>"-1"</button>
@@ -151,6 +156,8 @@ fn inc() {
</div>
}
}
.outer_html())
.outer_html()
);
runtime.dispose();
}

View File

@@ -1,11 +1 @@
extend = [{ path = "../cargo-make/main.toml" }]
[tasks.build]
command = "cargo"
args = ["+nightly", "build-all-features"]
install_crate = "cargo-all-features"
[tasks.check]
command = "cargo"
args = ["+nightly", "check-all-features"]
install_crate = "cargo-all-features"

View File

@@ -15,13 +15,12 @@ cfg_if! {
}
}
// "/api" is an optional prefix that allows you to locate server functions wherever you'd like on the server
#[server(GetServerCount, "/api")]
#[server]
pub async fn get_server_count() -> Result<i32, ServerFnError> {
Ok(COUNT.load(Ordering::Relaxed))
}
#[server(AdjustServerCount, "/api")]
#[server]
pub async fn adjust_server_count(
delta: i32,
msg: String,
@@ -33,16 +32,16 @@ pub async fn adjust_server_count(
Ok(new)
}
#[server(ClearServerCount, "/api")]
#[server]
pub async fn clear_server_count() -> Result<i32, ServerFnError> {
COUNT.store(0, Ordering::Relaxed);
_ = COUNT_CHANNEL.send(&0).await;
Ok(0)
}
#[component]
pub fn Counters(cx: Scope) -> impl IntoView {
provide_meta_context(cx);
view! { cx,
pub fn Counters() -> impl IntoView {
provide_meta_context();
view! {
<Router>
<header>
<h1>"Server-Side Counters"</h1>
@@ -69,20 +68,20 @@ pub fn Counters(cx: Scope) -> impl IntoView {
<Routes>
<Route
path=""
view=|cx| {
view! { cx, <Counter/> }
view=|| {
view! { <Counter/> }
}
/>
<Route
path="form"
view=|cx| {
view! { cx, <FormCounter/> }
view=|| {
view! { <FormCounter/> }
}
/>
<Route
path="multi"
view=|cx| {
view! { cx, <MultiuserCounter/> }
view=|| {
view! { <MultiuserCounter/> }
}
/>
</Routes>
@@ -96,12 +95,11 @@ pub fn Counters(cx: Scope) -> impl IntoView {
// it's invalidated by one of the user's own actions
// This is the typical pattern for a CRUD app
#[component]
pub fn Counter(cx: Scope) -> impl IntoView {
let dec = create_action(cx, |_| adjust_server_count(-1, "decing".into()));
let inc = create_action(cx, |_| adjust_server_count(1, "incing".into()));
let clear = create_action(cx, |_| clear_server_count());
pub fn Counter() -> impl IntoView {
let dec = create_action(|_| adjust_server_count(-1, "decing".into()));
let inc = create_action(|_| adjust_server_count(1, "incing".into()));
let clear = create_action(|_| clear_server_count());
let counter = create_resource(
cx,
move || {
(
dec.version().get(),
@@ -112,20 +110,16 @@ pub fn Counter(cx: Scope) -> impl IntoView {
|_| get_server_count(),
);
let value = move || {
counter
.read(cx)
.map(|count| count.unwrap_or(0))
.unwrap_or(0)
};
let value =
move || counter.get().map(|count| count.unwrap_or(0)).unwrap_or(0);
let error_msg = move || {
counter.read(cx).and_then(|res| match res {
counter.get().and_then(|res| match res {
Ok(_) => None,
Err(e) => Some(e),
})
};
view! { cx,
view! {
<div>
<h2>"Simple Counter"</h2>
<p>
@@ -140,7 +134,7 @@ pub fn Counter(cx: Scope) -> impl IntoView {
{move || {
error_msg()
.map(|msg| {
view! { cx, <p>"Error: " {msg.to_string()}</p> }
view! { <p>"Error: " {msg.to_string()}</p> }
})
}}
</div>
@@ -151,12 +145,13 @@ pub fn Counter(cx: Scope) -> impl IntoView {
// It uses the same invalidation pattern as the plain counter,
// but uses HTML forms to submit the actions
#[component]
pub fn FormCounter(cx: Scope) -> impl IntoView {
let adjust = create_server_action::<AdjustServerCount>(cx);
let clear = create_server_action::<ClearServerCount>(cx);
pub fn FormCounter() -> impl IntoView {
// these struct names are auto-generated by #[server]
// they are just the PascalCased versions of the function names
let adjust = create_server_action::<AdjustServerCount>();
let clear = create_server_action::<ClearServerCount>();
let counter = create_resource(
cx,
move || (adjust.version().get(), clear.version().get()),
|_| {
log::debug!("FormCounter running fetcher");
@@ -165,10 +160,10 @@ pub fn FormCounter(cx: Scope) -> impl IntoView {
);
let value = move || {
log::debug!("FormCounter looking for value");
counter.read(cx).and_then(|n| n.ok()).unwrap_or(0)
counter.get().and_then(|n| n.ok()).unwrap_or(0)
};
view! { cx,
view! {
<div>
<h2>"Form Counter"</h2>
<p>
@@ -203,12 +198,11 @@ pub fn FormCounter(cx: Scope) -> impl IntoView {
// Whenever another user updates the value, it will update here
// This is the primitive pattern for live chat, collaborative editing, etc.
#[component]
pub fn MultiuserCounter(cx: Scope) -> impl IntoView {
pub fn MultiuserCounter() -> impl IntoView {
let dec =
create_action(cx, |_| adjust_server_count(-1, "dec dec goose".into()));
let inc =
create_action(cx, |_| adjust_server_count(1, "inc inc moose".into()));
let clear = create_action(cx, |_| clear_server_count());
create_action(|_| adjust_server_count(-1, "dec dec goose".into()));
let inc = create_action(|_| adjust_server_count(1, "inc inc moose".into()));
let clear = create_action(|_| clear_server_count());
#[cfg(not(feature = "ssr"))]
let multiplayer_value = {
@@ -218,7 +212,6 @@ pub fn MultiuserCounter(cx: Scope) -> impl IntoView {
gloo_net::eventsource::futures::EventSource::new("/api/events")
.expect("couldn't connect to SSE stream");
let s = create_signal_from_stream(
cx,
source
.subscribe("message")
.unwrap()
@@ -232,14 +225,14 @@ pub fn MultiuserCounter(cx: Scope) -> impl IntoView {
}),
);
on_cleanup(cx, move || source.close());
on_cleanup(move || source.close());
s
};
#[cfg(feature = "ssr")]
let (multiplayer_value, _) = create_signal(cx, None::<i32>);
let (multiplayer_value, _) = create_signal(None::<i32>);
view! { cx,
view! {
<div>
<h2>"Multi-User Counter"</h2>
<p>

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