reactjs / reactjs/react.dev

[Bug]:Possible wrong descrption for useDeferredValue

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bug: unconfirmed
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JavaScript
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描述

Summary

The doucmention describe the wrong behaviour for useDeferredValue

Page

https://react.dev/reference/react/Suspense

Details

The documentation says:

The query will update immediately, so the input will display the new value. However, the deferredQuery will keep its previous value until the data has loaded

From my test, deferredQuery also updates immediately rather than waiting for the data to be loaded here is the link https://codesandbox.io/p/sandbox/react-dev-forked-kxfktt

Image

useDeferredValue consistently lags query with around 4 or 5 ms

Think about it, if deferredQuery updates after SearchResults is ready, how SearchResults receive the latest data at the first place?

The real reason we can see opacity: 0.2 for several seconds is that the new content is not rendered yet; rather than

the deferredQuery will keep its previous value until the data has loaded

If my understanding is correct, I should say the documentation is misleading, especially for the newbies

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调研方向

阅读 https://react.dev/reference/react/Suspense 上关于 useDeferredValue 的段落,并在链接的 CodeSandbox 中复现该行为。将关于 deferredQuery 的措辞与观察到的时序进行比较,然后更新文档,使其准确解释值何时发生变化,以及不透明度表示什么。

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评估

技术栈
react
领域
documentation
Issue 类型
文档
难度
2/5
预计耗时
1-3 小时
活跃度
停滞
描述清晰度
基本清楚
新手友好度
52/100

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