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@kcuf/react-hook-is-unmounted

v0.1.1

Published

React hook - useIsUnmounted.

Downloads

165

Readme

@kcuf/react-hook-is-unmounted

Usage

import {
  ReactElement,
  useState,
  useEffect,
  useCallback
} from 'react';

// i would recommend placing all your data calls in a folder, one api per file
import dataSome, { // dataSomeList is some async method returning Promise<IDataSome>
  IDataSome
} from ':/data/some';
import dataOther, { // dataSomeList is some async method returning Promise<IDataSome>
  IDataOther
} from ':/data/other';

import useIsUnmounted from '@kcuf/react-hook-is-unmounted';

export default function SomeComponent(): ReactElement {
  const isUnmounted = useIsUnmounted();
  const [stateDataSome, setStateDataSome] = useState<IDataSome | null>(null);
  const [stateErrorSome, setStateErrorSome] = useState<Error | null>(null);
  const [stateDataOther, setStateDataOther] = useState<IDataOther | null>(null);
  const [stateErrorOther, setStateErrorOther] = useState<Error | null>(null);
  
  // use in effect directly
  useEffect(() => {
    dataSome().then(data => {
      if (isUnmounted()) {
        return;
      }
      
      setStateDataSome(data);
    }, (err: Error) => {
      if (isUnmounted()) {
        return;
      }
      
      setStateErrorSome(err);
    });
  }, [isUnmounted]);
  // or use as a callback
  const handleGetOther = useCallback(() => {
    dataOther().then(data => {
      if (isUnmounted()) {
        return;
      }
      
      setStateDataOther(data);
    }, (err: Error) => {
      if (isUnmounted()) {
        return;
      }
      
      setStateErrorOther(err);
    });
  }, [isUnmounted]);
  
  return stateDataSome || stateErrorSome ? <div>
    <ResultSome data={stateDataSome} error={stateErrorSome} />
    {stateDataOther || stateErrorOther ? <ResultOther data={stateDataOther} error={stateErrorOther} /> : null}
    <Button onClick={handleGetOther}>get other</Button>
  </div> : <Loading />;
};

参考

为什么不用 use-async-effect

use-async-effect 仅适用于 effect,且每个 effect 都会去创建对应的逻辑。这是我之前的选择,但当我期望创建一个事件处理函数,在事件处理函数中做异步操作的时候就发现完全不行。

为什么不用 react-is-mounted-hook

嗯,我一开始是用它,版本 1.0.3,但它连最基本的 useCallback 都没用,而且它的例子中 useEffectdeps 并没有把 isMounted 列入,而我在写代码的时候列入了,结果陷入了死循环。 虽然它有个 PR 在进行中,就是修复这个问题的,不过我等不了了。

为什么偏偏叫 isUnmounted 而不是 isMounted

个人觉得是这个 hook 着重点是判断组件被「卸载」,所以.. 而且这样有助于编写符合简单条件优先 return 原则的代码(如以上的例子)。