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207 Commits

Author SHA1 Message Date
Greg Johnston
9e8b559e51 handle optional props correctly 2023-08-19 07:21:56 -04:00
Greg Johnston
db4ce00f98 add MaybeSignal deserialization 2023-08-19 07:21:56 -04:00
Greg Johnston
9edcc5f43b add support for island props 2023-08-19 07:21:56 -04:00
Greg Johnston
ea2cda3d17 work on serializing props 2023-08-19 07:21:56 -04:00
Greg Johnston
1d5252b97e fix iOS Safari pleeeaaassseeee stop it, Apple 2023-08-19 07:21:56 -04:00
Greg Johnston
d175249d00 fix build 2023-08-19 07:21:56 -04:00
Greg Johnston
35a9d84734 ignore rIC if not supported 2023-08-19 07:21:56 -04:00
Greg Johnston
c8a5434c9b start work on serializing props in DOM 2023-08-19 07:21:56 -04:00
Greg Johnston
ac00ea4ffe fix merge issues 2023-08-19 07:21:56 -04:00
Greg Johnston
59b708db9f support suspense with islands 2023-08-19 07:21:56 -04:00
Greg Johnston
722f6913d1 make whole JS import idle-only 2023-08-19 07:21:56 -04:00
Greg Johnston
aabcfb7ac3 switch to data-hk for all use cases 2023-08-19 07:21:56 -04:00
Greg Johnston
e691ae391f fix re-layouts on hydration (WIP) 2023-08-19 07:21:56 -04:00
Greg Johnston
7c3fd1d67d use correct name for hkc 2023-08-19 07:21:56 -04:00
Greg Johnston
88ee228389 turn fragments back off 2023-08-19 07:21:56 -04:00
Greg Johnston
02b0ac15a3 make whole hydration process idle 2023-08-19 07:21:56 -04:00
Greg Johnston
83edcfe29d restore compression 2023-08-19 07:21:56 -04:00
Greg Johnston
b288b7d838 do set fragment 2023-08-19 07:21:56 -04:00
Greg Johnston
a1a78f165a axum islands example 2023-08-19 07:21:56 -04:00
Greg Johnston
1f3453e94b rIC per island and resuming based on keys both working 2023-08-19 07:21:56 -04:00
Greg Johnston
e8b35ba284 work on resuming HK 2023-08-19 07:21:56 -04:00
Greg Johnston
02275d4fc0 requestIdleCallback per island 2023-08-19 07:21:56 -04:00
Greg Johnston
18e44be19a playing with islands hackernews 2023-08-19 07:21:56 -04:00
Greg Johnston
0bd4e5269a request idle callback before hydration 2023-08-19 07:21:56 -04:00
Greg Johnston
88405bfd10 intern id removal 2023-08-19 07:21:56 -04:00
Greg Johnston
80bc9a4e10 islands 2023-08-19 07:21:56 -04:00
Greg Johnston
b4c3068ddd got children working! 2023-08-19 07:21:56 -04:00
Greg Johnston
ac5406b8a6 fix merge issues 2023-08-19 07:21:56 -04:00
Greg Johnston
8f38a8a5f5 do the island hydration directly in JS, save a kb 2023-08-19 07:21:56 -04:00
Greg Johnston
bd7ff6a3fc support multiple islands, oops 2023-08-19 07:21:56 -04:00
Greg Johnston
c2d9696494 working super-basic islands implementation 2023-08-19 07:21:56 -04:00
Greg Johnston
35893d4eb9 release mode benchmarks 2023-08-19 07:20:10 -04:00
Greg Johnston
c3959d1de8 make hydration keys optional (to allow NoHydrate areas) 2023-08-19 07:20:10 -04:00
Greg Johnston
76c9d8233a islands 2023-08-19 07:20:10 -04:00
Greg Johnston
2988fc1c36 initial islands work 2023-08-19 07:20:09 -04:00
Greg Johnston
e7662ae940 perf: don't include unused hydration code in CSR bundles 2023-08-19 07:20:09 -04:00
Greg Johnston
674fcd2ade stash 2023-08-19 07:20:09 -04:00
Greg Johnston
5beab9f3cc fix examples 2023-08-19 07:03:54 -04:00
Greg Johnston
49be4a219d .map_ref() => .map() 2023-08-18 14:14:45 -04:00
Greg Johnston
f92aebdf01 cargo fmt example 2023-08-18 14:14:07 -04:00
Greg Johnston
6ba7a8e235 nope 2023-08-18 14:07:42 -04:00
Greg Johnston
10e3106760 removing cx/Scope from some merged docs 2023-08-18 08:41:37 -04:00
Greg Johnston
63dee1c93f closes issue #1558 2023-08-18 08:36:56 -04:00
Greg Johnston
fca4215fdb Change resource API to .get(), .with(), .map_ref(), and .and_then() 2023-08-18 08:36:56 -04:00
Greg Johnston
72cde5c355 use tuple form of .child() 2023-08-18 08:36:56 -04:00
Greg Johnston
0bf1f11638 avoid panic in use_navigate during SSR 2023-08-18 08:36:56 -04:00
Greg Johnston
2ea4531313 0.5.0-beta 2023-08-18 08:36:56 -04:00
Greg Johnston
bd2acfc530 fix example 2023-08-18 08:36:56 -04:00
Greg Johnston
42ff663622 sometimes Rust's variable scoping rules baffle me (should fix panic with overlapping BorrowMut in on_cleanup) 2023-08-18 08:36:56 -04:00
Greg Johnston
8ffd5c69ab erroneous log 2023-08-18 08:36:56 -04:00
Greg Johnston
90ce31edf8 fix unsetting of title when navigating between multiple pages 2023-08-18 08:36:56 -04:00
Greg Johnston
e7160092f6 fix Suspense-For-Suspense panic 2023-08-18 08:36:56 -04:00
Greg Johnston
c6bd7a40e7 pull in changes to view macor from main 2023-08-18 08:36:56 -04:00
Greg Johnston
d544a678b1 remove removed API 2023-08-18 08:36:56 -04:00
Greg Johnston
4b96a71da5 on_cleanup untracked (fixes #1494) 2023-08-18 08:36:56 -04:00
Greg Johnston
6ab95d8a16 remove deprecated APIs 2023-08-18 08:36:56 -04:00
Greg Johnston
db51f6d2b4 embed requestAnimationFrame into navigate() 2023-08-18 08:36:56 -04:00
Greg Johnston
964a26b5d3 BAD rebase, NO rebase. 2023-08-18 08:36:56 -04:00
Greg Johnston
1871d2bc6d impl Serialize and Deserialize for signal types 2023-08-18 08:36:56 -04:00
Greg Johnston
fc82788bcc add some useful From implementations 2023-08-18 08:36:56 -04:00
Ben Wishovich
dba5c444ae fix: render_route() path matching (#1479) 2023-08-18 08:36:56 -04:00
Greg Johnston
95f285f126 fix <For/> in SSR 2023-08-18 08:36:56 -04:00
Greg Johnston
5865ea4048 fix: restore missing fixes in <For/> (closes #1473) 2023-08-18 08:36:56 -04:00
Greg Johnston
121c312ba3 alpha 2 2023-08-18 08:36:56 -04:00
Greg Johnston
19967d1dd5 remove duplicate from merge 2023-08-18 08:36:56 -04:00
Greg Johnston
42a1395ffd clippy 2023-08-18 08:36:56 -04:00
Greg Johnston
421715f923 clean up window click listener 2023-08-18 08:36:56 -04:00
Greg Johnston
0eba690993 cancelable handle for window_event_listener 2023-08-18 08:36:56 -04:00
Greg Johnston
2a971b5fd3 remove scope 2023-08-18 08:36:56 -04:00
Greg Johnston
8701bd88bd closes #1465 2023-08-18 08:36:56 -04:00
Greg Johnston
8ccc731e91 better error messages for expect_context 2023-08-18 08:36:56 -04:00
Greg Johnston
b9bb999b6a was breaking something 2023-08-18 08:36:56 -04:00
Greg Johnston
d7080bff96 don't double-create children in nested suspense in ssr 2023-08-18 08:36:56 -04:00
Greg Johnston
52eea6222b track caller for better error messages 2023-08-18 08:36:56 -04:00
Greg Johnston
c1c469fd08 better error messages 2023-08-18 08:36:56 -04:00
Greg Johnston
42d18d4b54 clippy 2023-08-18 08:36:56 -04:00
Greg Johnston
e69d55190e fix routing progress display 2023-08-18 08:36:56 -04:00
Ben Wishovich
431f5398f9 Add render_route functions to respect SsrMode on routes when using custom handlers (#1460) 2023-08-18 08:36:56 -04:00
Greg Johnston
3223182141 add <Route data/> loaders again 2023-08-18 08:36:56 -04:00
Greg Johnston
815acee19b even even better error message 2023-08-18 08:36:56 -04:00
Greg Johnston
270622ce86 typo in doctest 2023-08-18 08:36:56 -04:00
Greg Johnston
de97e2dc12 fix ssr tests 2023-08-18 08:36:56 -04:00
Greg Johnston
3dd12bf416 fix release build SSR 2023-08-18 08:36:56 -04:00
Greg Johnston
59d3450d5b gtfo 2023-08-18 08:36:56 -04:00
Greg Johnston
02d0849a34 don't need to render EachItem markers for View::Element nodes 2023-08-18 08:36:56 -04:00
Greg Johnston
41f8d66565 restore continuing from current id 2023-08-18 08:36:56 -04:00
Greg Johnston
8da6710e44 add separate error field in hydration keys 2023-08-18 08:36:56 -04:00
IcosaHedron
38a68926ca cleanups must be called before properties are disposed (#1449) 2023-08-18 08:36:56 -04:00
Greg Johnston
895c8765ed add MaybeProp 2023-08-18 08:36:56 -04:00
Greg Johnston
ddd797f853 clean up logs 2023-08-18 08:36:56 -04:00
Greg Johnston
39dd204cda fix spawn docs examples 2023-08-18 08:36:56 -04:00
Greg Johnston
90041a9e99 fix reactive tests 2023-08-18 08:36:56 -04:00
Greg Johnston
d3a6d59970 cx in tests 2023-08-18 08:36:56 -04:00
Greg Johnston
314c803e4d v0.5.0-alpha 2023-08-18 08:36:56 -04:00
Greg Johnston
f5028e200e add some panic docs 2023-08-18 08:36:56 -04:00
Greg Johnston
fd15859ee4 clean up docs 2023-08-18 08:36:56 -04:00
Greg Johnston
d4ede63b3a clippy 2023-08-18 08:36:42 -04:00
Greg Johnston
b7c4a9d5c7 fix errorboundary 2023-08-18 08:36:42 -04:00
Greg Johnston
c780924c3d fix views in component macro docs 2023-08-18 08:36:42 -04:00
Greg Johnston
d2e8981e94 component macro 2023-08-18 08:36:42 -04:00
Greg Johnston
449a14bf16 fix issues in examples 2023-08-18 08:36:42 -04:00
Greg Johnston
5cc4c977ad tests 2023-08-18 08:36:42 -04:00
Greg Johnston
67ee6d5dbf ssr tests 2023-08-18 08:36:42 -04:00
Greg Johnston
919ab91cb0 fix 2023-08-18 08:36:42 -04:00
Greg Johnston
3f0c908479 fixing tests 2023-08-18 08:36:42 -04:00
Greg Johnston
a7cf566700 clippy 2023-08-18 08:36:42 -04:00
Greg Johnston
a30356da12 remove _ = cx; 2023-08-18 08:36:42 -04:00
Greg Johnston
c612c2c0a3 clippy 2023-08-18 08:36:42 -04:00
Greg Johnston
370d8a951a fix merge issues 2023-08-18 08:36:42 -04:00
Greg Johnston
b3d75125d4 clean up 2023-08-18 08:36:42 -04:00
Greg Johnston
b12b397f15 clean up 2023-08-18 08:36:42 -04:00
Greg Johnston
39d9b806ff remove Scope from docs 2023-08-18 08:36:42 -04:00
Greg Johnston
02c4bb31bc remove cx from docs 2023-08-18 08:36:41 -04:00
Greg Johnston
52f0ce4b48 fix Viz 2023-08-18 08:35:57 -04:00
Greg Johnston
b8d30676f8 move forbid(unsafe) to crate level 2023-08-18 08:35:57 -04:00
Greg Johnston
e7b52c0076 fix watch 2023-08-18 08:35:57 -04:00
Greg Johnston
8cc3ece052 even better error msg 2023-08-18 08:35:57 -04:00
Greg Johnston
a19e83818d better error when failing to deserialize resource JSON 2023-08-18 08:35:57 -04:00
Greg Johnston
e92029d36c fix suspense ownership chain 2023-08-18 08:35:57 -04:00
Greg Johnston
4a9d959488 unused import 2023-08-18 08:35:57 -04:00
Greg Johnston
9fd9d94783 get AnimatedOutlet working 2023-08-18 08:35:57 -04:00
Greg Johnston
241ca5e4dd restore <AnimatedRoutes/> 2023-08-18 08:35:57 -04:00
Greg Johnston
39e81136c5 fix suspense 2023-08-18 08:35:57 -04:00
Greg Johnston
0ebf63f8af cleaning up tests 2023-08-18 08:35:57 -04:00
Greg Johnston
0b532735fc default impls 2023-08-18 08:35:57 -04:00
Greg Johnston
40998f62c3 don't store runtime ID in signals 2023-08-18 08:35:57 -04:00
Greg Johnston
4df6057393 squash work on reactive ownership 2023-08-18 08:35:57 -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
466 changed files with 24050 additions and 10556 deletions

View File

@@ -11,8 +11,45 @@ env:
CARGO_REGISTRIES_CRATES_IO_PROTOCOL: sparse
jobs:
setup:
name: Detect Changes
runs-on: ubuntu-latest
outputs:
source_changed: ${{ steps.set-source-changed.outputs.source_changed }}
steps:
- name: Checkout
uses: actions/checkout@v3
- name: Get source files that changed
id: changed-source
uses: tj-actions/changed-files@v36
with:
files: |
integrations
leptos
leptos_config
leptos_dom
leptos_hot_reload
leptos_macro
leptos_reactive
leptos_server
meta
router
server_fn
server_fn_macro
- name: List source files that changed
run: echo '${{ steps.changed-source.outputs.all_changed_files }}'
- name: Set source_changed
id: set-source-changed
run: |
echo "source_changed=${{ steps.changed-source.outputs.any_changed }}" >> "$GITHUB_OUTPUT"
test:
name: Check examples ${{ matrix.os }} (using rustc ${{ matrix.rust }})
needs: [setup]
if: needs.setup.outputs.source_changed == 'true'
runs-on: ${{ matrix.os }}
strategy:
matrix:

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@@ -84,6 +84,11 @@ jobs:
restore-keys: |
${{ runner.os }}-pnpm-store-
- name: Install Chrome Webriver
run: |
sudo apt-get update
sudo apt-get install chromium-chromedriver
# Run Cargo Make Task
- name: ${{ inputs.cargo_make_task }}
run: |

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@@ -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 = "0.4.5"
version = "0.5.0-beta"
[workspace.dependencies]
leptos = { path = "./leptos", version = "0.4.5" }
leptos_dom = { path = "./leptos_dom", version = "0.4.5" }
leptos_hot_reload = { path = "./leptos_hot_reload", version = "0.4.5" }
leptos_macro = { path = "./leptos_macro", version = "0.4.5" }
leptos_reactive = { path = "./leptos_reactive", version = "0.4.5" }
leptos_server = { path = "./leptos_server", version = "0.4.5" }
server_fn = { path = "./server_fn", version = "0.4.5" }
server_fn_macro = { path = "./server_fn_macro", version = "0.4.5" }
server_fn_macro_default = { path = "./server_fn/server_fn_macro_default", version = "0.4.5" }
leptos_config = { path = "./leptos_config", version = "0.4.5" }
leptos_router = { path = "./router", version = "0.4.5" }
leptos_meta = { path = "./meta", version = "0.4.5" }
leptos_integration_utils = { path = "./integrations/utils", version = "0.4.5" }
leptos = { path = "./leptos", version = "0.5.0-beta" }
leptos_dom = { path = "./leptos_dom", version = "0.5.0-beta" }
leptos_hot_reload = { path = "./leptos_hot_reload", version = "0.5.0-beta" }
leptos_macro = { path = "./leptos_macro", version = "0.5.0-beta" }
leptos_reactive = { path = "./leptos_reactive", version = "0.5.0-beta" }
leptos_server = { path = "./leptos_server", version = "0.5.0-beta" }
server_fn = { path = "./server_fn", version = "0.5.0-beta" }
server_fn_macro = { path = "./server_fn_macro", version = "0.5.0-beta" }
server_fn_macro_default = { path = "./server_fn/server_fn_macro_default", version = "0.5.0-beta" }
leptos_config = { path = "./leptos_config", version = "0.5.0-beta" }
leptos_router = { path = "./router", version = "0.5.0-beta" }
leptos_meta = { path = "./meta", version = "0.5.0-beta" }
leptos_integration_utils = { path = "./integrations/utils", version = "0.5.0-beta" }
[profile.release]
codegen-units = 1

View File

@@ -20,6 +20,18 @@ cwd = "examples"
command = "cargo"
args = ["make", "ci-clean"]
[tasks.check-examples]
workspace = false
cwd = "examples"
command = "cargo"
args = ["make", "check-clean"]
[tasks.build-examples]
workspace = false
cwd = "examples"
command = "cargo"
args = ["make", "build-clean"]
[tasks.clean-examples]
workspace = false
cwd = "examples"

View File

@@ -88,8 +88,6 @@ 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).

View File

@@ -5,9 +5,9 @@ edition = "2021"
[dependencies]
l021 = { package = "leptos", version = "0.2.1" }
leptos = { path = "../leptos", features = ["ssr"] }
leptos = { path = "../leptos", features = ["ssr", "nightly", "islands"] }
sycamore = { version = "0.8", features = ["ssr"] }
yew = { git = "https://github.com/yewstack/yew", features = ["ssr"] }
yew = { version = "0.20", features = ["ssr"] }
tokio-test = "0.4"
miniserde = "0.1"
gloo = "0.8"

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 />

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

@@ -26,7 +26,8 @@ cargo init leptos-tutorial
cargo add leptos --features=csr,nightly
```
Or you can leave off `nighly` if you're using stable Rust
Or you can leave off `nightly` if you're using stable Rust
```bash
cargo add leptos --features=csr
```
@@ -64,7 +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

@@ -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>
}
@@ -143,12 +143,12 @@ Here, instead of reading from the state signal directly, we create “slices”
```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 |_| {
@@ -214,15 +214,15 @@ use leptos::*;
// 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(cx: Scope) -> impl IntoView {
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(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! {
<h1>"Option 2: Passing Signals"</h1>
// SetterButton is allowed to modify the count
<SetterButton set_count/>
@@ -237,8 +237,8 @@ fn Option2(cx: Scope) -> impl IntoView {
/// A button that increments our global counter.
#[component]
fn SetterButton(cx: Scope, set_count: WriteSignal<u32>) -> impl IntoView {
view! { cx,
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"
@@ -249,14 +249,14 @@ fn SetterButton(cx: Scope, set_count: WriteSignal<u32>) -> impl IntoView {
/// 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>
@@ -272,17 +272,17 @@ fn FancyMath(cx: Scope) -> impl IntoView {
/// A component that shows a list of items generated from the global count.
#[component]
fn ListItems(cx: Scope) -> impl IntoView {
fn ListItems() -> impl IntoView {
// again, consume the global count signal with `use_context`
let count = use_context::<ReadSignal<u32>>(cx).expect("there to be a `count` signal provided");
let count = use_context::<ReadSignal<u32>>().expect("there to be a `count` signal provided");
let squares = move || {
(0..count())
.map(|n| view! { cx, <li>{n}<sup>"2"</sup> " is " {n * n}</li> })
.map(|n| view! { <li>{n}<sup>"2"</sup> " is " {n * n}</li> })
.collect::<Vec<_>>()
};
view! { cx,
view! {
<div class="consumer green">
<ul>{squares}</ul>
</div>
@@ -304,13 +304,13 @@ struct GlobalState {
}
#[component]
fn Option3(cx: Scope) -> impl IntoView {
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(cx, GlobalState::default());
provide_context(cx, state);
let state = create_rw_signal(GlobalState::default());
provide_context(state);
view! { cx,
view! {
<h1>"Option 3: Passing Signals"</h1>
<div class="red consumer" style="width: 100%">
<h2>"Current Global State"</h2>
@@ -329,12 +329,12 @@ fn Option3(cx: Scope) -> impl IntoView {
/// A component that updates the count in the global state.
#[component]
fn GlobalStateCounter(cx: Scope) -> impl IntoView {
let state = use_context::<RwSignal<GlobalState>>(cx).expect("state to have been provided");
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(
cx,
// we take a slice *from* `state`
state,
// our getter returns a "slice" of the data
@@ -343,7 +343,7 @@ fn GlobalStateCounter(cx: Scope) -> impl IntoView {
|state, n| state.count = n,
);
view! { cx,
view! {
<div class="consumer blue">
<button
on:click=move |_| {
@@ -360,14 +360,14 @@ fn GlobalStateCounter(cx: Scope) -> impl IntoView {
/// A component that updates the count in the global state.
#[component]
fn GlobalStateInput(cx: Scope) -> impl IntoView {
let state = use_context::<RwSignal<GlobalState>>(cx).expect("state to have been provided");
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(
cx,
// we take a slice *from* `state`
state,
// our getter returns a "slice" of the data
@@ -376,7 +376,7 @@ fn GlobalStateInput(cx: Scope) -> impl IntoView {
|state, n| state.name = n,
);
view! { cx,
view! {
<div class="consumer green">
<input
type="text"
@@ -395,7 +395,7 @@ fn GlobalStateInput(cx: Scope) -> impl IntoView {
// Because we defined it as `fn App`, we can now use it in a
// template as <App/>
fn main() {
leptos::mount_to_body(|cx| view! { cx, <Option2/><Option3/> })
leptos::mount_to_body(|| view! { <Option2/><Option3/> })
}
```

View File

@@ -43,5 +43,6 @@
- [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`
@@ -11,10 +11,10 @@ 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 {
@@ -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()
}}
}
```
@@ -71,13 +68,13 @@ async fn load_data(value: i32) -> i32 {
}
#[component]
fn App(cx: Scope) -> impl IntoView {
fn App() -> impl IntoView {
// this count is our synchronous, local state
let (count, set_count) = create_signal(cx, 0);
let (count, set_count) = create_signal(0);
// create_resource takes two arguments after its scope
let async_data = create_resource(
cx,
// the first is the "source signal"
count,
// the second is the loader
@@ -90,14 +87,14 @@ fn App(cx: Scope) -> impl IntoView {
// 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(cx, || (), |_| async move { load_data(1).await });
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(cx)
.read()
.map(|value| format!("Server returned {value:?}"))
// This loading state will only show before the first load
.unwrap_or_else(|| "Loading...".into())
@@ -108,7 +105,7 @@ fn App(cx: Scope) -> impl IntoView {
let loading = async_data.loading();
let is_loading = move || if loading() { "Loading..." } else { "Idle." };
view! { cx,
view! {
<button
on:click=move |_| {
set_count.update(|n| *n += 1);
@@ -117,7 +114,7 @@ fn App(cx: Scope) -> impl IntoView {
"Click me"
</button>
<p>
<code>"stable"</code>": " {move || stable.read(cx)}
<code>"stable"</code>": " {move || stable.read()}
</p>
<p>
<code>"count"</code>": " {count}
@@ -132,7 +129,7 @@ fn App(cx: Scope) -> impl IntoView {
}
fn main() {
leptos::mount_to_body(|cx| view! { cx, <App/> })
leptos::mount_to_body(|| view! { <App/> })
}
```

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 a = 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 +69,34 @@ 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>
@@ -86,17 +114,17 @@ async fn important_api_call(name: String) -> String {
}
#[component]
fn App(cx: Scope) -> impl IntoView {
let (name, set_name) = create_signal(cx, "Bill".to_string());
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(
cx,
name,
|name| async move { important_api_call(name).await },
);
view! { cx,
view! {
<input
on:input=move |ev| {
set_name(event_target_value(&ev));
@@ -107,20 +135,20 @@ fn App(cx: Scope) -> impl IntoView {
<Suspense
// the fallback will show whenever a resource
// read "under" the suspense is loading
fallback=move || view! { cx, <p>"Loading..."</p> }
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(cx)}
{move || async_data.read()}
</p>
</Suspense>
}
}
fn main() {
leptos::mount_to_body(|cx| view! { cx, <App/> })
leptos::mount_to_body(|| view! { <App/> })
}
```

View File

@@ -29,13 +29,13 @@ async fn important_api_call(id: usize) -> String {
}
#[component]
fn App(cx: Scope) -> impl IntoView {
let (tab, set_tab) = create_signal(cx, 0);
fn App() -> impl IntoView {
let (tab, set_tab) = create_signal(0);
// this will reload every time `tab` changes
let user_data = create_resource(cx, tab, |tab| async move { important_api_call(tab).await });
let user_data = create_resource(tab, |tab| async move { important_api_call(tab).await });
view! { cx,
view! {
<div class="buttons">
<button
on:click=move |_| set_tab(0)
@@ -65,17 +65,17 @@ fn App(cx: Scope) -> impl IntoView {
// the fallback will show initially
// on subsequent reloads, the current child will
// continue showing
fallback=move || view! { cx, <p>"Loading..."</p> }
fallback=move || view! { <p>"Loading..."</p> }
>
<p>
{move || user_data.read(cx)}
{move || user_data.read()}
</p>
</Transition>
}
}
fn main() {
leptos::mount_to_body(|cx| view! { cx, <App/> })
leptos::mount_to_body(|| view! { <App/> })
}
```

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...
@@ -116,10 +116,10 @@ async fn add_todo(text: &str) -> Uuid {
}
#[component]
fn App(cx: Scope) -> impl IntoView {
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(cx, |input: &String| {
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
@@ -133,9 +133,9 @@ fn App(cx: Scope) -> impl IntoView {
let pending = add_todo.pending();
let todo_id = add_todo.value();
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...
@@ -168,7 +168,7 @@ fn App(cx: Scope) -> impl IntoView {
}
fn main() {
leptos::mount_to_body(|cx| view! { cx, <App/> })
leptos::mount_to_body(|| view! { <App/> })
}
```

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_website /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_website"]
```
> 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 +50,18 @@ 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 +70,7 @@ Suspense(
.children(children)
.build(),
)
.into_view(cx)),
.into_view()),
]
})
}
@@ -91,22 +91,22 @@ 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 +125,9 @@ 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 +137,18 @@ 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 +165,7 @@ 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 +42,15 @@ 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 +77,9 @@ 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 +87,13 @@ 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 +109,34 @@ 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>
@@ -121,30 +149,30 @@ use leptos::html::Input;
use leptos::*;
#[component]
fn App(cx: Scope) -> impl IntoView {
fn App() -> impl IntoView {
// Just making a visible log here
// You can ignore this...
let log = create_rw_signal::<Vec<String>>(cx, vec![]);
let log = create_rw_signal::<Vec<String>>(vec![]);
let logged = move || log().join("\n");
provide_context(cx, log);
provide_context(log);
view! { cx,
view! {
<CreateAnEffect/>
<pre>{logged}</pre>
}
}
#[component]
fn CreateAnEffect(cx: Scope) -> impl IntoView {
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);
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(cx, move |_| {
create_effect(move |_| {
log(
cx,
if use_last() {
format!("{} {}", first(), last())
} else {
@@ -153,7 +181,7 @@ fn CreateAnEffect(cx: Scope) -> impl IntoView {
)
});
view! { cx,
view! {
<h1><code>"create_effect"</code> " Version"</h1>
<form>
<label>
@@ -179,14 +207,14 @@ fn CreateAnEffect(cx: Scope) -> impl IntoView {
}
#[component]
fn ManualVersion(cx: Scope) -> impl IntoView {
let first = create_node_ref::<Input>(cx);
let last = create_node_ref::<Input>(cx);
let use_last = create_node_ref::<Input>(cx);
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(cx, " listener");
log(" listener");
let first = first.get().unwrap();
let last = last.get().unwrap();
let use_last = use_last.get().unwrap();
@@ -197,12 +225,12 @@ fn ManualVersion(cx: Scope) -> impl IntoView {
};
if this_one != prev_name {
log(cx, &this_one);
log(&this_one);
prev_name = this_one;
}
};
view! { cx,
view! {
<h1>"Manual Version"</h1>
<form on:change=on_change>
<label>
@@ -229,12 +257,12 @@ fn ManualVersion(cx: Scope) -> impl IntoView {
}
#[component]
fn EffectVsDerivedSignal(cx: Scope) -> impl IntoView {
let (my_value, set_my_value) = create_signal(cx, String::new());
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(cx, Option::<String>::None);
/*let (my_optional_value, set_optional_my_value) = create_signal(Option::<String>::None);
create_effect(cx, move |_| {
create_effect(move |_| {
if !my_value.get().is_empty() {
set_optional_my_value(Some(my_value.get()));
} else {
@@ -246,7 +274,7 @@ fn EffectVsDerivedSignal(cx: Scope) -> impl IntoView {
let my_optional_value =
move || (!my_value.with(String::is_empty)).then(|| Some(my_value.get()));
view! { cx,
view! {
<input
prop:value=my_value
on:input= move |ev| set_my_value(event_target_value(&ev))
@@ -258,7 +286,7 @@ fn EffectVsDerivedSignal(cx: Scope) -> impl IntoView {
<code>
<Show
when=move || my_optional_value().is_some()
fallback=|cx| view! { cx, "None" }
fallback=|| view! { "None" }
>
"Some(\"" {my_optional_value().unwrap()} "\")"
</Show>
@@ -270,9 +298,9 @@ fn EffectVsDerivedSignal(cx: Scope) -> impl IntoView {
/*#[component]
pub fn Show<F, W, IV>(
/// The scope the component is running in
cx: Scope,
/// The components Show wraps
children: Box<dyn Fn(Scope) -> Fragment>,
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
@@ -280,24 +308,24 @@ pub fn Show<F, W, IV>(
) -> impl IntoView
where
W: Fn() -> bool + 'static,
F: Fn(Scope) -> IV + 'static,
F: Fn() -> IV + 'static,
IV: IntoView,
{
let memoized_when = create_memo(cx, move |_| when());
let memoized_when = create_memo(move |_| when());
move || match memoized_when.get() {
true => children(cx).into_view(cx),
false => fallback(cx).into_view(cx),
true => children().into_view(),
false => fallback().into_view(),
}
}*/
fn log(cx: Scope, msg: impl std::fmt::Display) {
let log = use_context::<RwSignal<Vec<String>>>(cx).unwrap();
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(|cx| view! { cx, <App/> })
leptos::mount_to_body(|| view! { <App/> })
}
```

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 |_| {
create_effect(move |_| {
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>

View File

@@ -14,7 +14,7 @@ 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());
```
@@ -22,7 +22,7 @@ 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());
```
@@ -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()));
}
@@ -70,33 +70,39 @@ After all, `.with()` simply takes a function that takes the value by reference.
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>
@@ -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!
@@ -179,8 +179,8 @@ use leptos::*;
use leptos_router::*;
#[component]
fn App(cx: Scope) -> impl IntoView {
view! { cx,
fn App() -> impl IntoView {
view! {
<Router>
<h1>"Contact App"</h1>
// this <nav> will show on every routes,
@@ -195,31 +195,29 @@ fn App(cx: Scope) -> impl IntoView {
<main>
<Routes>
// / just has an un-nested "Home"
<Route path="/" view=|cx| view! { cx,
<Route path="/" view=|| view! {
<h3>"Home"</h3>
}/>
// /contacts has nested routes
<Route
path="/contacts"
view=|cx| view! { cx, <ContactList/> }
>
view=ContactList
>
// if no id specified, fall back
<Route path=":id" view=|cx| view! { cx,
<ContactInfo/>
}>
<Route path="" view=|cx| view! { cx,
<Route path=":id" view=ContactInfo>
<Route path="" view=|| view! {
<div class="tab">
"(Contact Info)"
</div>
}/>
<Route path="conversations" view=|cx| view! { cx,
<Route path="conversations" view=|| view! {
<div class="tab">
"(Conversations)"
</div>
}/>
</Route>
// if no id specified, fall back
<Route path="" view=|cx| view! { cx,
<Route path="" view=|| view! {
<div class="select-user">
"Select a user to view contact info."
</div>
@@ -232,8 +230,8 @@ fn App(cx: Scope) -> impl IntoView {
}
#[component]
fn ContactList(cx: Scope) -> impl IntoView {
view! { cx,
fn ContactList() -> impl IntoView {
view! {
<div class="contact-list">
// here's our contact list component itself
<div class="contact-list-contacts">
@@ -252,9 +250,9 @@ fn ContactList(cx: Scope) -> impl IntoView {
}
#[component]
fn ContactInfo(cx: Scope) -> impl IntoView {
fn ContactInfo() -> impl IntoView {
// we can access the :id param reactively with `use_params_map`
let params = use_params_map(cx);
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
@@ -265,7 +263,7 @@ fn ContactInfo(cx: Scope) -> impl IntoView {
_ => "User not found.",
};
view! { cx,
view! {
<div class="contact-info">
<h4>{name}</h4>
<div class="tabs">
@@ -281,7 +279,7 @@ fn ContactInfo(cx: Scope) -> impl IntoView {
}
fn main() {
leptos::mount_to_body(|cx| view! { cx, <App/> })
leptos::mount_to_body(|| view! { <App/> })
}
```

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 || {
@@ -86,8 +94,8 @@ use leptos::*;
use leptos_router::*;
#[component]
fn App(cx: Scope) -> impl IntoView {
view! { cx,
fn App() -> impl IntoView {
view! {
<Router>
<h1>"Contact App"</h1>
// this <nav> will show on every routes,
@@ -102,31 +110,29 @@ fn App(cx: Scope) -> impl IntoView {
<main>
<Routes>
// / just has an un-nested "Home"
<Route path="/" view=|cx| view! { cx,
<Route path="/" view=|| view! {
<h3>"Home"</h3>
}/>
// /contacts has nested routes
<Route
path="/contacts"
view=|cx| view! { cx, <ContactList/> }
view=ContactList
>
// if no id specified, fall back
<Route path=":id" view=|cx| view! { cx,
<ContactInfo/>
}>
<Route path="" view=|cx| view! { cx,
<Route path=":id" view=ContactInfo>
<Route path="" view=|| view! {
<div class="tab">
"(Contact Info)"
</div>
}/>
<Route path="conversations" view=|cx| view! { cx,
<Route path="conversations" view=|| view! {
<div class="tab">
"(Conversations)"
</div>
}/>
</Route>
// if no id specified, fall back
<Route path="" view=|cx| view! { cx,
<Route path="" view=|| view! {
<div class="select-user">
"Select a user to view contact info."
</div>
@@ -139,8 +145,8 @@ fn App(cx: Scope) -> impl IntoView {
}
#[component]
fn ContactList(cx: Scope) -> impl IntoView {
view! { cx,
fn ContactList() -> impl IntoView {
view! {
<div class="contact-list">
// here's our contact list component itself
<div class="contact-list-contacts">
@@ -159,9 +165,9 @@ fn ContactList(cx: Scope) -> impl IntoView {
}
#[component]
fn ContactInfo(cx: Scope) -> impl IntoView {
fn ContactInfo() -> impl IntoView {
// we can access the :id param reactively with `use_params_map`
let params = use_params_map(cx);
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
@@ -172,7 +178,7 @@ fn ContactInfo(cx: Scope) -> impl IntoView {
_ => "User not found.",
};
view! { cx,
view! {
<div class="contact-info">
<h4>{name}</h4>
<div class="tabs">
@@ -188,7 +194,7 @@ fn ContactInfo(cx: Scope) -> impl IntoView {
}
fn main() {
leptos::mount_to_body(|cx| view! { cx, <App/> })
leptos::mount_to_body(|| view! { <App/> })
}
```

View File

@@ -11,11 +11,28 @@ 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)
@@ -30,8 +47,8 @@ use leptos::*;
use leptos_router::*;
#[component]
fn App(cx: Scope) -> impl IntoView {
view! { cx,
fn App() -> impl IntoView {
view! {
<Router>
<h1>"Contact App"</h1>
// this <nav> will show on every routes,
@@ -46,31 +63,29 @@ fn App(cx: Scope) -> impl IntoView {
<main>
<Routes>
// / just has an un-nested "Home"
<Route path="/" view=|cx| view! { cx,
<Route path="/" view=|| view! {
<h3>"Home"</h3>
}/>
// /contacts has nested routes
<Route
path="/contacts"
view=|cx| view! { cx, <ContactList/> }
view=ContactList
>
// if no id specified, fall back
<Route path=":id" view=|cx| view! { cx,
<ContactInfo/>
}>
<Route path="" view=|cx| view! { cx,
<Route path=":id" view=ContactInfo>
<Route path="" view=|| view! {
<div class="tab">
"(Contact Info)"
</div>
}/>
<Route path="conversations" view=|cx| view! { cx,
<Route path="conversations" view=|| view! {
<div class="tab">
"(Conversations)"
</div>
}/>
</Route>
// if no id specified, fall back
<Route path="" view=|cx| view! { cx,
<Route path="" view=|| view! {
<div class="select-user">
"Select a user to view contact info."
</div>
@@ -83,8 +98,8 @@ fn App(cx: Scope) -> impl IntoView {
}
#[component]
fn ContactList(cx: Scope) -> impl IntoView {
view! { cx,
fn ContactList() -> impl IntoView {
view! {
<div class="contact-list">
// here's our contact list component itself
<div class="contact-list-contacts">
@@ -103,9 +118,9 @@ fn ContactList(cx: Scope) -> impl IntoView {
}
#[component]
fn ContactInfo(cx: Scope) -> impl IntoView {
fn ContactInfo() -> impl IntoView {
// we can access the :id param reactively with `use_params_map`
let params = use_params_map(cx);
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
@@ -116,7 +131,7 @@ fn ContactInfo(cx: Scope) -> impl IntoView {
_ => "User not found.",
};
view! { cx,
view! {
<div class="contact-info">
<h4>{name}</h4>
<div class="tabs">
@@ -132,7 +147,7 @@ fn ContactInfo(cx: Scope) -> impl IntoView {
}
fn main() {
leptos::mount_to_body(|cx| view! { cx, <App/> })
leptos::mount_to_body(|| view! { <App/> })
}
```

View File

@@ -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()"
@@ -74,13 +74,13 @@ use leptos::*;
use leptos_router::*;
#[component]
fn App(cx: Scope) -> impl IntoView {
view! { cx,
fn App() -> impl IntoView {
view! {
<Router>
<h1><code>"<Form/>"</code></h1>
<main>
<Routes>
<Route path="" view=|cx| view! { cx, <FormExample/> }/>
<Route path="" view=FormExample/>
</Routes>
</main>
</Router>
@@ -88,14 +88,14 @@ fn App(cx: Scope) -> impl IntoView {
}
#[component]
pub fn FormExample(cx: Scope) -> impl IntoView {
pub fn FormExample() -> impl IntoView {
// reactive access to URL query
let query = use_query_map(cx);
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! { cx,
view! {
// read out the URL query strings
<table>
<tr>
@@ -172,7 +172,7 @@ pub fn FormExample(cx: Scope) -> impl IntoView {
}
fn main() {
leptos::mount_to_body(|cx| view! { cx, <App/> })
leptos::mount_to_body(|| view! { <App/> })
}
```

View File

@@ -31,9 +31,9 @@ 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;
@@ -100,9 +100,9 @@ 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.
## An Important Note on Security
@@ -113,7 +113,7 @@ 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 +35,14 @@ 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 +60,7 @@ 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

@@ -8,7 +8,7 @@ Put a log somewhere in your root component. (I usually call mine `<App/>`, but a
```rust
#[component]
pub fn App(cx: Scope) -> impl IntoView {
pub fn App() -> impl IntoView {
leptos::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()
}
```
@@ -93,20 +93,20 @@ This is a slightly more common way to create a client/server mismatch: updating
```rust
#[component]
pub fn App(cx: Scope) -> impl IntoView {
let (loaded, set_loaded) = create_signal(cx, false);
pub fn App() -> impl IntoView {
let (loaded, set_loaded) = create_signal(false);
// create_effect only runs on the client
create_effect(cx, move |_| {
create_effect(move |_| {
// do something like reading from localStorage
set_loaded(true);
});
move || {
if loaded() {
view! { cx, <p>"Hello, world!"</p> }.into_any()
view! { <p>"Hello, world!"</p> }.into_any()
} else {
view! { cx, <div class="loading">"Loading..."</div> }.into_any()
view! { <div class="loading">"Loading..."</div> }.into_any()
}
}
}
@@ -129,7 +129,7 @@ The problem here is that `create_effect` runs **immediately** and **synchronousl
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(cx, move |_| {
create_effect(move |_| {
// do something like reading from localStorage
request_animation_frame(move || set_loaded(true));
});
@@ -163,7 +163,7 @@ 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:?}");
@@ -176,9 +176,9 @@ 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:?}");
});

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()
@@ -43,8 +43,8 @@ mod tests {
}
#[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/web.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”:
@@ -171,16 +170,16 @@ use leptos::*;
// Components are the building blocks of your user interface
// They define a reusable unit of behavior
#[component]
fn App(cx: Scope) -> impl IntoView {
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(cx, 0);
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! { cx,
view! {
<button
// on:click will run whenever the `click` event fires
// every event handler is defined as `on:{eventname}`
@@ -221,6 +220,6 @@ fn App(cx: Scope) -> impl IntoView {
// Because we defined it as `fn App`, we can now use it in a
// template as <App/>
fn main() {
leptos::mount_to_body(|cx| view! { cx, <App/> })
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)
@@ -144,10 +144,27 @@ 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 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)
@@ -160,15 +177,15 @@ places in your application with minimal overhead.
use leptos::*;
#[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);
// 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! { cx,
view! {
<button
on:click=move |_| {
set_count.update(|n| *n += 1);
@@ -210,7 +227,7 @@ fn App(cx: Scope) -> impl IntoView {
}
fn main() {
leptos::mount_to_body(|cx| view! { cx, <App/> })
leptos::mount_to_body(|| view! { <App/> })
}
```

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
@@ -36,9 +36,9 @@ Instead, lets create a `<ProgressBar/>` component.
```rust
#[component]
fn ProgressBar(
cx: Scope
) -> impl IntoView {
view! { cx,
view! {
<progress
max="50"
// hmm... where will we get this from?
@@ -64,10 +64,10 @@ 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 +81,9 @@ 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 +118,14 @@ 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 +149,12 @@ 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 +171,11 @@ 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 +199,7 @@ 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 +207,7 @@ fn ProgressBar<F>(
where
F: Fn() -> i32 + 'static,
{
view! { cx,
view! {
<progress
max=max
value=progress
@@ -219,9 +219,24 @@ 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 +254,14 @@ 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 +270,95 @@ 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 +373,7 @@ 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 +394,24 @@ 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>
@@ -324,8 +430,6 @@ use leptos::*;
/// Shows progress toward a goal.
#[component]
fn ProgressBar(
// All components take a reactive `Scope` as the first argument
cx: Scope,
// Marks this as an optional prop. It will default to the default
// value of its type, i.e., 0.
#[prop(default = 100)]
@@ -339,7 +443,7 @@ fn ProgressBar(
/// How much progress should be displayed.
progress: Signal<i32>,
) -> impl IntoView {
view! { cx,
view! {
<progress
max={max}
value=progress
@@ -349,12 +453,12 @@ 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);
@@ -372,12 +476,12 @@ fn App(cx: Scope) -> impl IntoView {
<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(cx, double_count)/>
<ProgressBar max=50 progress=Signal::derive(double_count)/>
}
}
fn main() {
leptos::mount_to_body(|cx| view! { cx, <App/> })
leptos::mount_to_body(|| view! { <App/> })
}
```

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>
}
```
@@ -120,8 +120,8 @@ use leptos::*;
// 2) for lists that grow, shrink, or move items, using <For/>
#[component]
fn App(cx: Scope) -> impl IntoView {
view! { cx,
fn App() -> impl IntoView {
view! {
<h1>"Iteration"</h1>
<h2>"Static List"</h2>
<p>"Use this pattern if the list itself is static."</p>
@@ -136,19 +136,19 @@ fn App(cx: Scope) -> impl IntoView {
/// to add or remove any.
#[component]
fn StaticList(
cx: Scope,
/// 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(cx, idx));
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! { cx,
view! {
<li>
<button
on:click=move |_| set_count.update(|n| *n += 1)
@@ -163,7 +163,7 @@ fn StaticList(
// 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! { cx,
view! {
<ul>{counter_buttons}</ul>
}
}
@@ -172,7 +172,7 @@ fn StaticList(
/// remove counters.
#[component]
fn DynamicList(
cx: Scope,
/// The number of counters to begin with.
initial_length: usize,
) -> impl IntoView {
@@ -190,17 +190,17 @@ fn DynamicList(
// 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(cx, id + 1)))
.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(cx, initial_counters);
let (counters, set_counters) = create_signal(initial_counters);
let add_counter = move |_| {
// create a signal for the new counter
let sig = create_signal(cx, next_counter_id + 1);
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`
@@ -211,7 +211,7 @@ fn DynamicList(
next_counter_id += 1;
};
view! { cx,
view! {
<div>
<button on:click=add_counter>
"Add Counter"
@@ -231,8 +231,8 @@ fn DynamicList(
key=|counter| counter.0
// the view function receives each item from your `each` iterator
// and returns a view
view=move |cx, (id, (count, set_count))| {
view! { cx,
view=move |(id, (count, set_count))| {
view! {
<li>
<button
on:click=move |_| set_count.update(|n| *n += 1)
@@ -258,7 +258,7 @@ fn DynamicList(
}
fn main() {
leptos::mount_to_body(|cx| view! { cx, <App/> })
leptos::mount_to_body(|| view! { <App/> })
}
```

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
@@ -120,8 +148,8 @@ The view should be pretty self-explanatory by now. Note two things:
use leptos::{ev::SubmitEvent, *};
#[component]
fn App(cx: Scope) -> impl IntoView {
view! { cx,
fn App() -> impl IntoView {
view! {
<h2>"Controlled Component"</h2>
<ControlledComponent/>
<h2>"Uncontrolled Component"</h2>
@@ -130,11 +158,11 @@ fn App(cx: Scope) -> impl IntoView {
}
#[component]
fn ControlledComponent(cx: Scope) -> impl IntoView {
fn ControlledComponent() -> impl IntoView {
// create a signal to hold the value
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"
// fire an event whenever the input changes
on:input=move |ev| {
@@ -164,15 +192,15 @@ fn ControlledComponent(cx: Scope) -> impl IntoView {
}
#[component]
fn UncontrolledComponent(cx: Scope) -> impl IntoView {
fn UncontrolledComponent() -> impl IntoView {
// import the type for <input>
use leptos::html::Input;
let (name, set_name) = create_signal(cx, "Uncontrolled".to_string());
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(cx);
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
@@ -192,7 +220,7 @@ fn UncontrolledComponent(cx: Scope) -> impl IntoView {
set_name(value);
};
view! { cx,
view! {
<form on:submit=on_submit>
<input type="text"
// here, we use the `value` *attribute* to set only
@@ -214,7 +242,7 @@ fn UncontrolledComponent(cx: Scope) -> impl IntoView {
// Because we defined it as `fn App`, we can now use it in a
// template as <App/>
fn main() {
leptos::mount_to_body(|cx| view! { cx, <App/> })
leptos::mount_to_body(|| view! { <App/> })
}
```

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>
}
```
@@ -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/> }
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>
}
@@ -293,12 +294,12 @@ view! { cx,
use leptos::*;
#[component]
fn App(cx: Scope) -> impl IntoView {
let (value, set_value) = create_signal(cx, 0);
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! { cx,
view! {
<h1>"Control Flow"</h1>
// Simple UI to update and show a value
@@ -345,37 +346,37 @@ fn App(cx: Scope) -> impl IntoView {
// needed. This makes it more efficient in many cases
// than a {move || if ...} block
<Show when=is_odd
fallback=|cx| view! { cx, <p>"Even steven"</p> }
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! { cx, <p>"Oddity!"</p> })}
{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(cx)` (for all view types)
// or `.into_view()` (for all view types)
{move || match is_odd() {
true if value() == 1 => {
// <pre> returns HtmlElement<Pre>
view! { cx, <pre>"One"</pre> }.into_any()
view! { <pre>"One"</pre> }.into_any()
},
false if value() == 2 => {
// <p> returns HtmlElement<P>
// so we convert into a more generic type
view! { cx, <p>"Two"</p> }.into_any()
view! { <p>"Two"</p> }.into_any()
}
_ => view! { cx, <textarea>{value()}</textarea> }.into_any()
_ => view! { <textarea>{value()}</textarea> }.into_any()
}}
}
}
fn main() {
leptos::mount_to_body(|cx| view! { cx, <App/> })
leptos::mount_to_body(|| view! { <App/> })
}
```

View File

@@ -10,16 +10,16 @@ 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 on:input=on_input/>
<input type="number" on:input=on_input/>
<p>
"You entered "
<strong>{value}</strong>
@@ -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 on:input=on_input/>
<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>
@@ -121,13 +121,13 @@ an `<ErrorBoundary/>` will appear again.
use leptos::*;
#[component]
fn App(cx: Scope) -> impl IntoView {
let (value, set_value) = create_signal(cx, Ok(0));
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! { cx,
view! {
<h1>"Error Handling"</h1>
<label>
"Type a number (or something that's not a number!)"
@@ -137,7 +137,7 @@ fn App(cx: Scope) -> impl IntoView {
// <ErrorBoundary/> will be displayed.
<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
@@ -145,7 +145,7 @@ fn App(cx: Scope) -> impl IntoView {
<ul>
{move || errors.get()
.into_iter()
.map(|(_, e)| view! { cx, <li>{e.to_string()}</li>})
.map(|(_, e)| view! { <li>{e.to_string()}</li>})
.collect::<Vec<_>>()
}
</ul>
@@ -167,7 +167,7 @@ fn App(cx: Scope) -> impl IntoView {
}
fn main() {
leptos::mount_to_body(|cx| view! { cx, <App/> })
leptos::mount_to_body(|| view! { <App/> })
}
```

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)/>
}
@@ -73,13 +73,13 @@ pub fn App(cx: Scope) -> impl IntoView {
#[component]
pub fn ButtonB<F>(
cx: Scope,
on_click: F,
) -> impl IntoView
where
F: Fn(MouseEvent) + 'static,
{
view! { cx,
view! {
<button on:click=on_click>
"Toggle"
</button>
@@ -105,9 +105,9 @@ 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 +117,8 @@ pub fn App(cx: Scope) -> impl IntoView {
#[component]
pub fn ButtonC(cx: Scope) -> impl IntoView {
view! { cx,
pub fn ButtonC<F>() -> impl IntoView {
view! {
<button>"Toggle"</button>
}
}
@@ -141,17 +141,17 @@ 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 +162,8 @@ 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 +171,7 @@ 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 +182,17 @@ 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 +203,8 @@ 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 +212,7 @@ 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 +237,13 @@ 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 +252,14 @@ 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)
>
@@ -308,20 +308,20 @@ use leptos::{ev::MouseEvent, *};
struct SmallcapsContext(WriteSignal<bool>);
#[component]
pub fn App(cx: Scope) -> impl IntoView {
pub fn App() -> impl IntoView {
// just some signals to toggle three classes on our <p>
let (red, set_red) = create_signal(cx, false);
let (right, set_right) = create_signal(cx, false);
let (italics, set_italics) = create_signal(cx, false);
let (smallcaps, set_smallcaps) = create_signal(cx, false);
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(cx, SmallcapsContext(set_smallcaps));
provide_context(SmallcapsContext(set_smallcaps));
view! {
cx,
<main>
<p
// class: attributes take F: Fn() => bool, and these signals all implement Fn()
@@ -353,12 +353,12 @@ pub fn App(cx: Scope) -> impl IntoView {
/// Button A receives a signal setter and updates the signal itself
#[component]
pub fn ButtonA(
cx: Scope,
/// Signal that will be toggled when the button is clicked.
setter: WriteSignal<bool>,
) -> impl IntoView {
view! {
cx,
<button
on:click=move |_| setter.update(|value| *value = !*value)
>
@@ -370,7 +370,7 @@ pub fn ButtonA(
/// Button B receives a closure
#[component]
pub fn ButtonB<F>(
cx: Scope,
/// Callback that will be invoked when the button is clicked.
on_click: F,
) -> impl IntoView
@@ -378,7 +378,7 @@ where
F: Fn(MouseEvent) + 'static,
{
view! {
cx,
<button
on:click=on_click
>
@@ -402,9 +402,9 @@ where
/// 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(cx: Scope) -> impl IntoView {
pub fn ButtonC() -> impl IntoView {
view! {
cx,
<button>
"Toggle Italics"
</button>
@@ -414,11 +414,11 @@ pub fn ButtonC(cx: Scope) -> impl IntoView {
/// 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(cx: Scope) -> impl IntoView {
let setter = use_context::<SmallcapsContext>(cx).unwrap().0;
pub fn ButtonD() -> impl IntoView {
let setter = use_context::<SmallcapsContext>().unwrap().0;
view! {
cx,
<button
on:click=move |_| setter.update(|value| *value = !*value)
>
@@ -428,7 +428,7 @@ pub fn ButtonD(cx: Scope) -> impl IntoView {
}
fn main() {
leptos::mount_to_body(|cx| view! { cx, <App/> })
leptos::mount_to_body(|| view! { <App/> })
}
```

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 +47,7 @@ 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 +58,19 @@ 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 +78,8 @@ 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 +97,15 @@ 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>
}
}
@@ -114,12 +114,12 @@ 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>
}
```
@@ -142,19 +142,19 @@ use leptos::*;
// property
#[component]
pub fn App(cx: Scope) -> impl IntoView {
let (items, set_items) = create_signal(cx, vec![0, 1, 2]);
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! { cx,
view! {
<p>"Length: " {len}</p>
}
};
view! { cx,
view! {
// This component just displays the two kinds of children,
// embedding them in some other markup
<TakesChildren
@@ -179,12 +179,12 @@ pub fn App(cx: Scope) -> impl IntoView {
/// Displays a `render_prop` and some children within markup.
#[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,
/// `children` takes the `Children` type
/// this is an alias for `Box<dyn FnOnce(Scope) -> Fragment>`
/// this is an alias for `Box<dyn FnOnce() -> Fragment>`
/// ... aren't you glad we named it `Children` instead?
children: Children,
) -> impl IntoView
@@ -192,30 +192,30 @@ where
F: Fn() -> IV,
IV: IntoView,
{
view! { cx,
view! {
<h1><code>"<TakesChildren/>"</code></h1>
<h2>"Render Prop"</h2>
{render_prop()}
<hr/>
<h2>"Children"</h2>
{children(cx)}
{children()}
}
}
/// Wraps each child in an `<li>` and embeds them in a `<ul>`.
#[component]
pub fn WrapsChildren(cx: Scope, children: Children) -> impl IntoView {
// children(cx) returns a `Fragment`, which has a
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(cx)
let children = children()
.nodes
.into_iter()
.map(|child| view! { cx, <li>{child}</li> })
.map(|child| view! { <li>{child}</li> })
.collect::<Vec<_>>();
view! { cx,
view! {
<h1><code>"<WrapsChildren/>"</code></h1>
// wrap our wrapped children in a UL
<ul>{children}</ul>
@@ -223,7 +223,7 @@ pub fn WrapsChildren(cx: Scope, children: Children) -> impl IntoView {
}
fn main() {
leptos::mount_to_body(|cx| view! { cx, <App/> })
leptos::mount_to_body(|| view! { <App/> })
}
```

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 +48,65 @@ grep -v gtk |
jq -R -s -c 'split("\n")[:-1]')
echo "CARGO_MAKE_CRATE_WORKSPACE_MEMBERS = $examples"
'''
[tasks.test-runner-report]
workspace = false
description = "report ci test runners for each example - OPTION: [all]"
script = '''
BOLD="\e[1m"
GREEN="\e[0;32m"
ITALIC="\e[3m"
YELLOW="\e[0;33m"
RESET="\e[0m"
echo
echo "${YELLOW}Test Runner Report${RESET}"
echo "${ITALIC}Pass the option \"all\" to show all the examples${RESET}"
echo
makefile_paths=$(find . -name Makefile.toml -not -path '*/target/*' |
sed 's%./%%' |
sed 's%/Makefile.toml%%' |
grep -v Makefile.toml |
sort -u)
start_path=$(pwd)
for path in $makefile_paths; do
cd $path
test_runner=
test_count=$(grep -rl -E "#\[(test|rstest)\]" | wc -l)
if [ $test_count -gt 0 ]; then
test_runner="-C"
fi
while read -r line; do
case $line in
*"wasm-test.toml"*)
test_runner=$test_runner"-W"
;;
*"playwright-test.toml"*)
test_runner=$test_runner"-P"
;;
*"cargo-leptos-test.toml"*)
test_runner=$test_runner"-L"
;;
esac
done <"./Makefile.toml"
if [ ! -z "$1" ]; then
# Show all examples
echo "$path ${BOLD}${test_runner}${RESET}"
elif [ ! -z $test_runner ]; then
# Filter out examples that do not run tests in `ci`
echo "$path ${BOLD}${test_runner}${RESET}"
fi
cd ${start_path}
done
echo
echo "${ITALIC}Runners: C = Cargo Test, L = Cargo Leptos Test, P = Playwright Test, W = WASM Test${RESET}"
echo
'''

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

View File

@@ -0,0 +1,55 @@
[tasks.install-cargo-leptos]
install_crate = { crate_name = "cargo-leptos", binary = "cargo-leptos", test_arg = "--help" }
[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"]
[tasks.stop-client]
condition = { env_set = ["APP_PROCESS_NAME"] }
script = '''
if [ ! -z $(pidof ${APP_PROCESS_NAME}) ]; then
pkill -f todo_app_sqlite
fi
if [ ! -z $(pidof ${APP_PROCESS_NAME}) ]; then
pkill -f cargo-leptos
fi
'''
[tasks.client-status]
condition = { env_set = ["APP_PROCESS_NAME"] }
script = '''
if [ -z $(pidof ${APP_PROCESS_NAME}) ]; then
echo " ${APP_PROCESS_NAME} is not running"
else
echo " ${APP_PROCESS_NAME} is up"
fi
if [ -z $(pidof cargo-leptos) ]; then
echo " cargo-leptos is not running"
else
echo " cargo-leptos is up"
fi
'''

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

@@ -1,4 +1,5 @@
extend = [
{ path = "../cargo-make/compile.toml" },
{ path = "../cargo-make/clean.toml" },
{ path = "../cargo-make/lint.toml" },
{ path = "../cargo-make/node.toml" },
@@ -9,9 +10,6 @@ extend = [
[tasks.ci]
dependencies = ["prepare", "lint", "build", "test-flow", "integration-test"]
[tasks.ci-clean]
dependencies = ["ci", "clean"]
[tasks.prepare]
dependencies = ["setup-node"]
@@ -20,6 +18,17 @@ 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]

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

@@ -5,15 +5,14 @@ use leptos::*;
/// 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,
view! {
<div>
<button on:click=move |_| set_value(0)>"Clear"</button>
<button on:click=move |_| set_value.update(|value| *value -= step)>"-1"</button>

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

@@ -25,7 +25,7 @@ leptos_meta = { path = "../../meta" }
leptos_router = { path = "../../router" }
log = "0.4"
gloo-net = { git = "https://github.com/rustwasm/gloo" }
wasm-bindgen = "=0.2.87"
wasm-bindgen = "=0.2.86"
serde = { version = "1", features = ["derive"] }
[features]

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

@@ -40,9 +40,9 @@ pub async fn clear_server_count() -> Result<i32, ServerFnError> {
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>
@@ -67,10 +67,24 @@ pub fn Counters(cx: Scope) -> impl IntoView {
<Link rel="shortcut icon" type_="image/ico" href="/favicon.ico"/>
<main>
<Routes>
<Route path="" view=Counter/>
<Route path="form" view=FormCounter/>
<Route path="multi" view=MultiuserCounter/>
<Route path="multi" view=NotFound/>
<Route
path=""
view=|| {
view! { <Counter/> }
}
/>
<Route
path="form"
view=|| {
view! { <FormCounter/> }
}
/>
<Route
path="multi"
view=|| {
view! { <MultiuserCounter/> }
}
/>
</Routes>
</main>
</Router>
@@ -82,12 +96,11 @@ 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(),
@@ -98,20 +111,16 @@ 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>
@@ -126,7 +135,7 @@ 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>
@@ -137,12 +146,11 @@ 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 {
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");
@@ -151,19 +159,23 @@ 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>
"This counter uses forms to set the value on the server. When progressively enhanced, it should behave identically to the “Simple Counter.”"
</p>
<div>
// calling a server function is the same as POSTing to its API URL
// so we can just do that with a form and button
<ActionForm action=clear>
<input type="submit" value="Clear"/>
</ActionForm>
// We can submit named arguments to the server functions
// by including them as input values with the same name
<ActionForm action=adjust>
<input type="hidden" name="delta" value="-1"/>
<input type="hidden" name="msg" value="form value down"/>
@@ -185,12 +197,11 @@ 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 = {
@@ -200,7 +211,6 @@ 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()
@@ -214,14 +224,14 @@ 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>
@@ -238,14 +248,3 @@ pub fn MultiuserCounter(cx: Scope) -> impl IntoView {
</div>
}
}
#[component]
fn NotFound(cx: Scope) -> impl IntoView {
#[cfg(feature = "ssr")]
{
let resp = expect_context::<leptos_actix::ResponseOptions>(cx);
resp.set_status(actix_web::http::StatusCode::NOT_FOUND);
}
view! { cx, <h1>"Not Found"</h1> }
}

View File

@@ -13,8 +13,8 @@ cfg_if! {
_ = console_log::init_with_level(log::Level::Debug);
console_error_panic_hook::set_once();
mount_to_body(|cx| {
view! { cx, <Counters/> }
mount_to_body(|| {
view! { <Counters/> }
});
}
}

View File

@@ -43,7 +43,7 @@ cfg_if! {
let conf = get_configuration(None).await.unwrap();
let addr = conf.leptos_options.site_addr;
let routes = generate_route_list(|cx| view! { cx, <Counters/> });
let routes = generate_route_list(|| view! { <Counters/> });
HttpServer::new(move || {
let leptos_options = &conf.leptos_options;
@@ -52,36 +52,15 @@ cfg_if! {
App::new()
.service(counter_events)
.route("/api/{tail:.*}", leptos_actix::handle_server_fns())
// serve JS/WASM/CSS from `pkg`
.service(Files::new("/pkg", format!("{site_root}/pkg")))
// serve other assets from the `assets` directory
.service(Files::new("/assets", site_root))
// serve the favicon from /favicon.ico
.service(favicon)
.leptos_routes(
leptos_options.to_owned(),
routes.to_owned(),
Counters,
)
.app_data(web::Data::new(leptos_options.to_owned()))
.leptos_routes(leptos_options.to_owned(), routes.to_owned(), || view! { <Counters/> })
.service(Files::new("/", site_root))
//.wrap(middleware::Compress::default())
})
.bind(&addr)?
.run()
.await
}
#[actix_web::get("favicon.ico")]
async fn favicon(
leptos_options: actix_web::web::Data<leptos::LeptosOptions>,
) -> actix_web::Result<actix_files::NamedFile> {
let leptos_options = leptos_options.into_inner();
let site_root = &leptos_options.site_root;
Ok(actix_files::NamedFile::open(format!(
"{site_root}/favicon.ico"
))?)
}
}
// client-only main for Trunk
else {

View File

@@ -0,0 +1,20 @@
[package]
name = "counter_url_query"
version = "0.1.0"
edition = "2021"
[profile.release]
codegen-units = 1
lto = true
[dependencies]
leptos = { path = "../../leptos", features = ["csr", "nightly"] }
leptos_router = { path = "../../router", features = ["csr"] }
console_log = "1"
log = "0.4"
console_error_panic_hook = "0.1.7"
[dev-dependencies]
wasm-bindgen = "0.2"
wasm-bindgen-test = "0.3.0"
web-sys = "0.3"

View File

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

View File

@@ -0,0 +1,7 @@
# Leptos Query Counter Example
This example creates a simple counter whose state is persisted and synced in the url with query params.
To run it, just issue the `trunk serve --open` command in the example root. This will build the app, run it, and open a new browser to serve it.
> If you don't have `trunk` installed, [click here for install instructions.](https://trunkrs.dev/)

View File

@@ -0,0 +1,8 @@
<!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"/>
</head>
<body></body>
</html>

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@@ -0,0 +1,39 @@
use leptos::*;
use leptos_router::*;
/// A simple counter component.
///
/// You can use doc comments like this to document your component.
#[component]
pub fn SimpleQueryCounter() -> impl IntoView {
let (count, set_count) = create_query_signal::<i32>("count");
let clear = move |_| set_count(None);
let decrement = move |_| set_count(Some(count().unwrap_or(0) - 1));
let increment = move |_| set_count(Some(count().unwrap_or(0) + 1));
let (msg, set_msg) = create_query_signal::<String>("message");
let update_msg = move |ev| {
let new_msg = event_target_value(&ev);
if new_msg.is_empty() {
set_msg(None);
} else {
set_msg(Some(new_msg));
}
};
view! {
<div>
<button on:click=clear>"Clear"</button>
<button on:click=decrement>"-1"</button>
<span>"Value: " {move || count().unwrap_or(0)} "!"</span>
<button on:click=increment>"+1"</button>
<br />
<input
prop:value=move || msg().unwrap_or_default()
on:input=update_msg
/>
</div>
}
}

View File

@@ -0,0 +1,17 @@
use counter_url_query::SimpleQueryCounter;
use leptos::*;
use leptos_router::*;
pub fn main() {
_ = console_log::init_with_level(log::Level::Debug);
console_error_panic_hook::set_once();
mount_to_body(|| {
view! {
<Router>
<Routes>
<Route path="" view=SimpleQueryCounter />
</Routes>
</Router>
}
})
}

View File

@@ -4,11 +4,13 @@ extend = [
]
[tasks.build]
toolchain = "stable"
command = "cargo"
args = ["+stable", "build-all-features"]
args = ["build-all-features"]
install_crate = "cargo-all-features"
[tasks.check]
toolchain = "stable"
command = "cargo"
args = ["+stable", "check-all-features"]
args = ["check-all-features"]
install_crate = "cargo-all-features"

View File

@@ -2,40 +2,38 @@ use leptos::{ev, html::*, *};
/// 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(cx: Scope, initial_value: i32, step: u32) -> impl IntoView {
let (count, set_count) = create_signal(cx, Count::new(initial_value, step));
pub fn counter(initial_value: i32, step: u32) -> impl IntoView {
let (count, set_count) = create_signal(Count::new(initial_value, step));
// elements are created by calling a function with a Scope argument
// the function name is the same as the HTML tag name
div(cx)
div()
// children can be added with .child()
// this takes any type that implements IntoView as its argument
// for example, a string or an HtmlElement<_>
.child(
button(cx)
// it can also take an array of types that impl IntoView
// or a tuple of up to 26 objects that impl IntoView
.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"),
)
.child(
button(cx)
button()
.on(ev::click, move |_| {
set_count.update(|count| count.decrease())
})
.child("-1"),
)
.child(
span(cx)
span()
.child("Value: ")
// reactive values are passed to .child() as a tuple
// (Scope, [child function]) so an effect can be created
.child(move || count.get().value())
.child("!"),
)
))
.child(
button(cx)
button()
.on(ev::click, move |_| {
set_count.update(|count| count.increase())
})

View File

@@ -5,5 +5,5 @@ use leptos::*;
pub fn main() {
_ = console_log::init_with_level(log::Level::Debug);
console_error_panic_hook::set_once();
mount_to_body(|cx| counter(cx, 0, 1))
mount_to_body(|| counter(0, 1))
}

View File

@@ -41,7 +41,7 @@ fn should_clear_counter() {
fn open_counter() {
remove_existing_counter();
mount_to_body(move |cx| counter(cx, 0, 1));
mount_to_body(move || counter(0, 1));
}
fn remove_existing_counter() {

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

@@ -10,14 +10,14 @@ struct CounterUpdater {
}
#[component]
pub fn Counters(cx: Scope) -> impl IntoView {
let (next_counter_id, set_next_counter_id) = create_signal(cx, 0);
let (counters, set_counters) = create_signal::<CounterHolder>(cx, vec![]);
provide_context(cx, CounterUpdater { set_counters });
pub fn Counters() -> impl IntoView {
let (next_counter_id, set_next_counter_id) = create_signal(0);
let (counters, set_counters) = create_signal::<CounterHolder>(vec![]);
provide_context(CounterUpdater { set_counters });
let add_counter = move |_| {
let id = next_counter_id();
let sig = create_signal(cx, 0);
let sig = create_signal(0);
set_counters.update(move |counters| counters.push((id, sig)));
set_next_counter_id.update(|id| *id += 1);
};
@@ -25,7 +25,7 @@ pub fn Counters(cx: Scope) -> impl IntoView {
let add_many_counters = move |_| {
let next_id = next_counter_id();
let new_counters = (next_id..next_id + MANY_COUNTERS).map(|id| {
let signal = create_signal(cx, 0);
let signal = create_signal(0);
(id, signal)
});
@@ -37,7 +37,7 @@ pub fn Counters(cx: Scope) -> impl IntoView {
set_counters.update(|counters| counters.clear());
};
view! { cx,
view! {
<div>
<button on:click=add_counter>
"Add Counter"
@@ -65,8 +65,8 @@ pub fn Counters(cx: Scope) -> impl IntoView {
<For
each=counters
key=|counter| counter.0
view=move |cx, (id, (value, set_value)): (usize, (ReadSignal<i32>, WriteSignal<i32>))| {
view! { cx,
view=move |(id, (value, set_value)): (usize, (ReadSignal<i32>, WriteSignal<i32>))| {
view! {
<Counter id value set_value/>
}
}
@@ -78,12 +78,11 @@ pub fn Counters(cx: Scope) -> impl IntoView {
#[component]
fn Counter(
cx: Scope,
id: usize,
value: ReadSignal<i32>,
set_value: WriteSignal<i32>,
) -> impl IntoView {
let CounterUpdater { set_counters } = use_context(cx).unwrap();
let CounterUpdater { set_counters } = use_context().unwrap();
let input = move |ev| {
set_value(event_target_value(&ev).parse::<i32>().unwrap_or_default())
@@ -91,9 +90,9 @@ fn Counter(
// just an example of how a cleanup function works
// this will run when the scope is disposed, i.e., when this row is deleted
on_cleanup(cx, || log::debug!("deleted a row"));
on_cleanup(|| log::debug!("deleted a row"));
view! { cx,
view! {
<li>
<button on:click=move |_| set_value.update(move |value| *value -= 1)>"-1"</button>
<input type="text"

View File

@@ -4,5 +4,5 @@ use leptos::*;
fn main() {
_ = console_log::init_with_level(log::Level::Debug);
console_error_panic_hook::set_once();
mount_to_body(|cx| view! { cx, <Counters/> })
mount_to_body(|| view! { <Counters/> })
}

View File

@@ -8,7 +8,7 @@ use web_sys::HtmlElement;
#[wasm_bindgen_test]
fn inc() {
mount_to_body(|cx| view! { cx, <Counters/> });
mount_to_body(|| view! { <Counters/> });
let document = leptos::document();
let div = document.query_selector("div").unwrap().unwrap();

View File

@@ -5,15 +5,12 @@ edition = "2021"
[dependencies]
leptos = { path = "../../leptos", features = ["csr"] }
leptos_meta = { path = "../../meta", features = ["csr"] }
log = "0.4"
console_log = "1"
console_error_panic_hook = "0.1.7"
[dev-dependencies]
wasm-bindgen = "0.2.87"
wasm-bindgen-test = "0.3.37"
pretty_assertions = "1.3.0"
wasm-bindgen-test = "0.3.0"
[dev-dependencies.web-sys]
features = [

View File

@@ -1,11 +1,17 @@
extend = [
{ path = "../cargo-make/main.toml" },
{ path = "../cargo-make/wasm-test.toml" },
{ path = "../cargo-make/trunk_server.toml" },
{ path = "../cargo-make/playwright-test.toml" },
]
[tasks.build]
toolchain = "stable"
command = "cargo"
args = ["+stable", "build-all-features"]
args = ["build-all-features"]
install_crate = "cargo-all-features"
[tasks.check]
toolchain = "stable"
command = "cargo"
args = ["check-all-features"]
install_crate = "cargo-all-features"

View File

@@ -1,109 +0,0 @@
use leptos::*;
use leptos_meta::*;
const MANY_COUNTERS: usize = 1000;
type CounterHolder = Vec<(usize, (ReadSignal<i32>, WriteSignal<i32>))>;
#[derive(Copy, Clone)]
struct CounterUpdater {
set_counters: WriteSignal<CounterHolder>,
}
#[component]
pub fn Counters(cx: Scope) -> impl IntoView {
let (next_counter_id, set_next_counter_id) = create_signal(cx, 0);
let (counters, set_counters) = create_signal::<CounterHolder>(cx, vec![]);
provide_context(cx, CounterUpdater { set_counters });
provide_meta_context(cx);
let add_counter = move |_| {
let id = next_counter_id.get();
let sig = create_signal(cx, 0);
set_counters.update(move |counters| counters.push((id, sig)));
set_next_counter_id.update(|id| *id += 1);
};
let add_many_counters = move |_| {
let next_id = next_counter_id.get();
let new_counters = (next_id..next_id + MANY_COUNTERS).map(|id| {
let signal = create_signal(cx, 0);
(id, signal)
});
set_counters.update(move |counters| counters.extend(new_counters));
set_next_counter_id.update(|id| *id += MANY_COUNTERS);
};
let clear_counters = move |_| {
set_counters.update(|counters| counters.clear());
};
view! { cx,
<Title text="Counters (Stable)" />
<div>
<button on:click=add_counter>
"Add Counter"
</button>
<button on:click=add_many_counters>
{format!("Add {MANY_COUNTERS} Counters")}
</button>
<button on:click=clear_counters>
"Clear Counters"
</button>
<p>
"Total: "
<span data-testid="total">{move ||
counters.get()
.iter()
.map(|(_, (count, _))| count.get())
.sum::<i32>()
.to_string()
}</span>
" from "
<span data-testid="counters">{move || counters.with(|counters| counters.len()).to_string()}</span>
" counters."
</p>
<ul>
<For
each={move || counters.get()}
key={|counter| counter.0}
view=move |cx, (id, (value, set_value))| {
view! {
cx,
<Counter id value set_value/>
}
}
/>
</ul>
</div>
}
}
#[component]
fn Counter(
cx: Scope,
id: usize,
value: ReadSignal<i32>,
set_value: WriteSignal<i32>,
) -> impl IntoView {
let CounterUpdater { set_counters } = use_context(cx).unwrap();
let input = move |ev| {
set_value
.set(event_target_value(&ev).parse::<i32>().unwrap_or_default())
};
view! { cx,
<li>
<button data-testid="decrement_count" on:click=move |_| set_value.update(move |value| *value -= 1)>"-1"</button>
<input data-testid="counter_input" type="text"
prop:value={move || value.get().to_string()}
on:input=input
/>
<span>{value}</span>
<button data-testid="increment_count" on:click=move |_| set_value.update(move |value| *value += 1)>"+1"</button>
<button data-testid="remove_counter" on:click=move |_| set_counters.update(move |counters| counters.retain(|(counter_id, _)| counter_id != &id))>"x"</button>
</li>
}
}

View File

@@ -1,8 +1,110 @@
use counters_stable::Counters;
use leptos::*;
fn main() {
_ = console_log::init_with_level(log::Level::Debug);
console_error_panic_hook::set_once();
mount_to_body(|cx| view! { cx, <Counters/> })
mount_to_body(|| view! { <Counters/> })
}
const MANY_COUNTERS: usize = 1000;
type CounterHolder = Vec<(usize, (ReadSignal<i32>, WriteSignal<i32>))>;
#[derive(Copy, Clone)]
struct CounterUpdater {
set_counters: WriteSignal<CounterHolder>,
}
#[component]
pub fn Counters() -> impl IntoView {
let (next_counter_id, set_next_counter_id) = create_signal(0);
let (counters, set_counters) = create_signal::<CounterHolder>(vec![]);
provide_context(CounterUpdater { set_counters });
let add_counter = move |_| {
let id = next_counter_id.get();
let sig = create_signal(0);
set_counters.update(move |counters| counters.push((id, sig)));
set_next_counter_id.update(|id| *id += 1);
};
let add_many_counters = move |_| {
let next_id = next_counter_id.get();
let new_counters = (next_id..next_id + MANY_COUNTERS).map(|id| {
let signal = create_signal(0);
(id, signal)
});
set_counters.update(move |counters| counters.extend(new_counters));
set_next_counter_id.update(|id| *id += MANY_COUNTERS);
};
let clear_counters = move |_| {
set_counters.update(|counters| counters.clear());
};
view! {
<div>
<button on:click=add_counter>
"Add Counter"
</button>
<button on:click=add_many_counters>
{format!("Add {MANY_COUNTERS} Counters")}
</button>
<button on:click=clear_counters>
"Clear Counters"
</button>
<p>
"Total: "
<span data-testid="total">{move ||
counters.get()
.iter()
.map(|(_, (count, _))| count.get())
.sum::<i32>()
.to_string()
}</span>
" from "
<span data-testid="counters">{move || counters.with(|counters| counters.len()).to_string()}</span>
" counters."
</p>
<ul>
<For
each={move || counters.get()}
key={|counter| counter.0}
view=move |(id, (value, set_value))| {
view! {
<Counter id value set_value/>
}
}
/>
</ul>
</div>
}
}
#[component]
fn Counter(
id: usize,
value: ReadSignal<i32>,
set_value: WriteSignal<i32>,
) -> impl IntoView {
let CounterUpdater { set_counters } = use_context().unwrap();
let input = move |ev| {
set_value
.set(event_target_value(&ev).parse::<i32>().unwrap_or_default())
};
view! {
<li>
<button id="decrement_count" on:click=move |_| set_value.update(move |value| *value -= 1)>"-1"</button>
<input type="text"
prop:value={move || value.get().to_string()}
on:input=input
/>
<span>{value}</span>
<button id="increment_count" on:click=move |_| set_value.update(move |value| *value += 1)>"+1"</button>
<button on:click=move |_| set_counters.update(move |counters| counters.retain(|(counter_id, _)| counter_id != &id))>"x"</button>
</li>
}
}

View File

@@ -1,17 +0,0 @@
use super::*;
use crate::counters_page as ui;
use pretty_assertions::assert_eq;
#[wasm_bindgen_test]
fn should_increase_the_number_of_counters() {
// Given
ui::view_counters();
// When
ui::add_1k_counters();
ui::add_1k_counters();
ui::add_1k_counters();
// Then
assert_eq!(ui::counters(), 3000);
}

View File

@@ -1,17 +0,0 @@
use super::*;
use crate::counters_page as ui;
use pretty_assertions::assert_eq;
#[wasm_bindgen_test]
fn should_increase_the_number_of_counters() {
// Given
ui::view_counters();
// When
ui::add_counter();
ui::add_counter();
ui::add_counter();
// Then
assert_eq!(ui::counters(), 3);
}

View File

@@ -1,19 +0,0 @@
use super::*;
use crate::counters_page as ui;
use pretty_assertions::assert_eq;
#[wasm_bindgen_test]
fn should_reset_the_counts() {
// Given
ui::view_counters();
ui::add_counter();
ui::add_counter();
ui::add_counter();
// When
ui::clear_counters();
// Then
assert_eq!(ui::total(), 0);
assert_eq!(ui::counters(), 0);
}

View File

@@ -1,18 +0,0 @@
use super::*;
use crate::counters_page as ui;
use pretty_assertions::assert_eq;
#[wasm_bindgen_test]
fn should_decrease_the_total_count() {
// Given
ui::view_counters();
ui::add_counter();
// When
ui::decrement_counter(1);
ui::decrement_counter(1);
ui::decrement_counter(1);
// Then
assert_eq!(ui::total(), -3);
}

View File

@@ -1,112 +0,0 @@
use counters_stable::Counters;
use leptos::*;
use wasm_bindgen::JsCast;
use web_sys::{Element, Event, EventInit, HtmlElement, HtmlInputElement};
// Actions
pub fn add_1k_counters() {
find_by_text("Add 1000 Counters").click();
}
pub fn add_counter() {
find_by_text("Add Counter").click();
}
pub fn clear_counters() {
find_by_text("Clear Counters").click();
}
pub fn decrement_counter(index: u32) {
counter_html_element(index, "decrement_count").click();
}
pub fn enter_count(index: u32, count: i32) {
let input = counter_input_element(index, "counter_input");
input.set_value(count.to_string().as_str());
let mut event_init = EventInit::new();
event_init.bubbles(true);
let event = Event::new_with_event_init_dict("input", &event_init).unwrap();
input.dispatch_event(&event).unwrap();
}
pub fn increment_counter(index: u32) {
counter_html_element(index, "increment_count").click();
}
pub fn remove_counter(index: u32) {
counter_html_element(index, "remove_counter").click();
}
pub fn view_counters() {
remove_existing_counters();
mount_to_body(|cx| view! { cx, <Counters/> });
}
// Results
pub fn counters() -> i32 {
data_test_id("counters").parse::<i32>().unwrap()
}
pub fn title() -> String {
leptos::document().title()
}
pub fn total() -> i32 {
data_test_id("total").parse::<i32>().unwrap()
}
// Internal
fn counter_element(index: u32, text: &str) -> Element {
let selector =
format!("li:nth-child({}) [data-testid=\"{}\"]", index, text);
leptos::document()
.query_selector(&selector)
.unwrap()
.unwrap()
}
fn counter_html_element(index: u32, text: &str) -> HtmlElement {
counter_element(index, text)
.dyn_into::<HtmlElement>()
.unwrap()
}
fn counter_input_element(index: u32, text: &str) -> HtmlInputElement {
counter_element(index, text)
.dyn_into::<HtmlInputElement>()
.unwrap()
}
fn data_test_id(id: &str) -> String {
let selector = format!("[data-testid=\"{}\"]", id);
leptos::document()
.query_selector(&selector)
.unwrap()
.expect("counters not found")
.text_content()
.unwrap()
}
fn find_by_text(text: &str) -> HtmlElement {
let xpath = format!("//*[text()='{}']", text);
let document = leptos::document();
document
.evaluate(&xpath, &document)
.unwrap()
.iterate_next()
.unwrap()
.unwrap()
.dyn_into::<HtmlElement>()
.unwrap()
}
fn remove_existing_counters() {
if let Some(counter) =
leptos::document().query_selector("body div").unwrap()
{
counter.remove();
}
}

View File

@@ -1 +0,0 @@
pub mod counters_page;

View File

@@ -1,18 +0,0 @@
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);
}

View File

@@ -1,16 +0,0 @@
use wasm_bindgen_test::*;
// Test Suites
pub mod add_1k_counters;
pub mod add_counter;
pub mod clear_counters;
pub mod decrement_counter;
pub mod enter_count;
pub mod increment_counter;
pub mod remove_counter;
pub mod view_counters;
pub mod fixtures;
pub use fixtures::*;
wasm_bindgen_test_configure!(run_in_browser);

View File

@@ -1,18 +0,0 @@
use super::*;
use crate::counters_page as ui;
use pretty_assertions::assert_eq;
#[wasm_bindgen_test]
fn should_decrement_the_number_of_counters() {
// Given
ui::view_counters();
ui::add_counter();
ui::add_counter();
ui::add_counter();
// When
ui::remove_counter(2);
// Then
assert_eq!(ui::counters(), 2);
}

View File

@@ -1,22 +0,0 @@
use super::*;
use crate::counters_page as ui;
use pretty_assertions::assert_eq;
#[wasm_bindgen_test]
fn should_see_the_initial_counts() {
// When
ui::view_counters();
// Then
assert_eq!(ui::total(), 0);
assert_eq!(ui::counters(), 0);
}
#[wasm_bindgen_test]
fn should_see_the_title() {
// When
ui::view_counters();
// Then
assert_eq!(ui::title(), "Counters (Stable)");
}

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

@@ -1,23 +1,23 @@
use leptos::*;
#[component]
pub fn App(cx: Scope) -> impl IntoView {
let (value, set_value) = create_signal(cx, Ok(0));
pub 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! { cx,
view! {
<h1>"Error Handling"</h1>
<label>
"Type a number (or something that's not a number!)"
<input on:input=on_input/>
<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=|cx, errors| view! { cx,
fallback=|errors| view! {
<div class="error">
<p>"Not a number! Errors: "</p>
// we can render a list of errors
@@ -25,8 +25,8 @@ pub fn App(cx: Scope) -> impl IntoView {
<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>

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! {
<App/>
}
})

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

@@ -8,12 +8,11 @@ use leptos_axum::ResponseOptions;
// Feel free to do more complicated things here than just displaying them.
#[component]
pub fn ErrorTemplate(
cx: Scope,
#[prop(optional)] outside_errors: Option<Errors>,
#[prop(optional)] errors: Option<RwSignal<Errors>>,
) -> impl IntoView {
let errors = match outside_errors {
Some(e) => create_rw_signal(cx, e),
Some(e) => create_rw_signal(e),
None => match errors {
Some(e) => e,
None => panic!("No Errors found and we expected errors!"),
@@ -23,7 +22,7 @@ pub fn ErrorTemplate(
// Get Errors from Signal
// Downcast lets us take a type that implements `std::error::Error`
let errors: Vec<AppError> = errors
.get()
.get_untracked()
.into_iter()
.filter_map(|(_, v)| v.downcast_ref::<AppError>().cloned())
.collect();
@@ -32,13 +31,13 @@ pub fn ErrorTemplate(
// Only the response code for the first error is actually sent from the server
// this may be customized by the specific application
cfg_if! { if #[cfg(feature="ssr")] {
let response = use_context::<ResponseOptions>(cx);
let response = use_context::<ResponseOptions>();
if let Some(response) = response {
response.set_status(errors[0].status_code());
}
}}
view! { cx,
view! {
<h1>{if errors.len() > 1 {"Errors"} else {"Error"}}</h1>
<For
// a function that returns the items we're iterating over; a signal is fine
@@ -46,10 +45,10 @@ pub fn ErrorTemplate(
// a unique key for each item as a reference
key=|(index, _)| *index
// renders each item to a view
view=move |cx, error| {
view=move |error| {
let error_string = error.1.to_string();
let error_code= error.1.status_code();
view! { cx,
view! {
<h2>{error_code.to_string()}</h2>
<p>"Error: " {error_string}</p>
}

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