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1 | 1 | # react-router |
2 | 2 |
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| 3 | +## 6.4.0-pre.9 |
| 4 | + |
| 5 | +### Patch Changes |
| 6 | + |
| 7 | +- Feat: adds `deferred` support to data routers (#9002) |
| 8 | + |
| 9 | + Returning a `deferred` from a `loader` allows you to separate _critical_ loader data that you want to wait for prior to rendering the destination page from _non-critical_ data that you are OK to show a spinner for until it loads. |
| 10 | + |
| 11 | + ```jsx |
| 12 | + // In your route loader, return a deferred() and choose per-key whether to |
| 13 | + // await the promise or not. As soon as the awaited promises resolve, the |
| 14 | + // page will be rendered. |
| 15 | + function loader() { |
| 16 | + return deferred({ |
| 17 | + critical: await getCriticalData(), |
| 18 | + lazy1: getLazyData(), |
| 19 | + }); |
| 20 | + }; |
| 21 | + |
| 22 | + // In your route element, grab the values from useLoaderData and render them |
| 23 | + // with <Deferred> |
| 24 | + function DeferredPage() { |
| 25 | + let data = useLoaderData(); |
| 26 | + return ( |
| 27 | + <> |
| 28 | + <p>Critical Data: {data.critical}</p> |
| 29 | + <Deferred |
| 30 | + value={data.lazy} |
| 31 | + fallback={<p>Loading...</p>} |
| 32 | + errorElement={<RenderDeferredError />}> |
| 33 | + <RenderDeferredData /> |
| 34 | + </Deferred> |
| 35 | + </> |
| 36 | + ); |
| 37 | + } |
| 38 | + |
| 39 | + // Use separate components to render the data once it resolves, and access it |
| 40 | + // via the useDeferredData hook |
| 41 | + function RenderDeferredData() { |
| 42 | + let data = useDeferredData(); |
| 43 | + return <p>Lazy: {data}</p>; |
| 44 | + } |
| 45 | + |
| 46 | + function RenderDeferredError() { |
| 47 | + let data = useRouteError(); |
| 48 | + return <p>Error! {data.message} {data.stack}</p>; |
| 49 | + } |
| 50 | + ``` |
| 51 | + |
| 52 | + If you want to skip the separate components, you can use the Render Props |
| 53 | + pattern and handle the rendering of the deferred data inline: |
| 54 | + |
| 55 | + ```jsx |
| 56 | + function DeferredPage() { |
| 57 | + let data = useLoaderData(); |
| 58 | + return ( |
| 59 | + <> |
| 60 | + <p>Critical Data: {data.critical}</p> |
| 61 | + <Deferred value={data.lazy} fallback={<p>Loading...</p>}> |
| 62 | + {(data) => <p>{data}</p>} |
| 63 | + </Deferred> |
| 64 | + </> |
| 65 | + ); |
| 66 | + } |
| 67 | + ``` |
| 68 | + |
| 69 | +- feat: add basename support for data routers (#9026) |
| 70 | +- fix: Fix trailing slash behavior on pathless routing when using a basename (#9045) |
| 71 | +- Updated dependencies |
| 72 | + - @remix-run/router@0.2.0-pre.4 |
| 73 | + |
3 | 74 | ## 6.4.0-pre.8 |
4 | 75 |
|
5 | 76 | ### Patch Changes |
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