javascript - 与 React hooks 的 setState 回调等效

Question

我有一个带有答案列表的模态。我可以点击一个答案来选择它，然后点击一个按钮来确认我的选择。或者我可以双击一个答案来选择它并确认。

我无法正确处理双击案例。

对于 React 类组件，我会像这样使用 setState() 的回调:

setState({selectedAnswer: answer}, confirm)

但是现在，我只弄清楚了以下内容:

const MyModal = ({hide, setAnwser}) => {
  const [selectedAnswer, setSelectedAnswer] = useState(null);
  const [isSelectionDone, setIsSelectionDone] = useState(false);

  const confirm = () => {
    if (!selectedAnswer) {
      return;
    }

    setAnwser(selectedAnswer);
    hide();
  };

  const handleAnswerOnClick = (answer) => {
    setSelectedAnswer(answer);
  };

  const handleAnswerOnDoubleClick = (answer) => {
    setSelectedAnswer(answer);
    setIsSelectionDone(true);
  };

  useEffect(confirm, [isSelectionDone]);

  return (
    <div>
      <div>{answers.map((answer) => <MyAnswer
        isSelected={answer.id === selectedAnswer?.id}
        key={answer.id}
        answer={answer}
        onClick={handleAnswerOnClick}
        onDoubleClick={handleAnswerOnDoubleClick}/>)}</div>
      <button onClick={confirm}>Confirm</button>
    </div>
  );
}

我强烈怀疑有更好/更好的方法。

也许很简单:

const MyModal = ({hide, setAnwser}) => {
  const [selectedAnswer, setSelectedAnswer] = useState(null);

  const confirm = () => {
    if (!selectedAnswer) {
      return;
    }

    setAnwser(selectedAnswer);
    hide();
  };

  const handleAnswerOnClick = (answer) => {
    setSelectedAnswer(answer);
  };

  const handleAnswerOnDoubleClick = (answer) => {
    setAnwser(answer);
    hide();
  };

  return (
    <div>
      <div>{answers.map((answer) => <MyAnswer
        isSelected={answer.id === selectedAnswer?.id}
        key={answer.id}
        answer={answer}
        onClick={handleAnswerOnClick}
        onDoubleClick={handleAnswerOnDoubleClick}/>)}</div>
      <button onClick={confirm}>Confirm</button>
    </div>
  );
}

哪种方式更好？

Answer 1

钩子(Hook)中没有类似的设置状态(设置状态后触发回调)。但是，您可以应用以下重构:

 const confirm = (sAnswer = selectedAnswer) => {
    if (!sAnswer) {
      return;
    }

    setAnwser(sAnswer);
    hide();
  };

然后

 const handleAnswerOnDoubleClick = (answer) => {
    setSelectedAnswer(answer);
    confirm(answer);
  };