HOW - 实现 useClickOutside 或者 useClickAway

场景

在开发过程中经常遇到需要点击除某div范围之外的区域触发回调：比如点击 dialog 外部区域关闭。

手动实现

import { useEffect } from "react"

/**
 * A custom hook to detect clicks outside a specified element.
 * @param ref - A React ref object pointing to the element to detect outside clicks.
 * @param callback - A callback function triggered when a click outside is detected.
 */
const useClickOutside = (
    ref: React.RefObject<HTMLElement>,
    callback: () => void
) => {
    useEffect(() => {
        const handleClickOutside = (event: MouseEvent) => {
            if (ref.current && !ref.current.contains(event.target as Node)) {
                callback()
            }
        }
        document.addEventListener("mousedown", handleClickOutside)
        return () => {
            document.removeEventListener("mousedown", handleClickOutside)
        }
    }, [ref, callback])
}

export default useClickOutside

使用：

const [visible, toggle] = useToggle(false)
const triggerRef = useRef<HTMLDivElement | null>(null)
useClickOutside(triggerRef, () => toggle(false))

<div ref={triggerRef} onClick={toggle}>
    {trigger}
</div>

react-use: useClickAway

https://github.com/streamich/react-use/blob/master/docs/useClickAway.md

import {useClickAway} from 'react-use';

const Demo = () => {
  const ref = useRef(null);
  useClickAway(ref, () => {
    console.log('OUTSIDE CLICKED');
  });

  return (
    <div ref={ref} style={{
      width: 200,
      height: 200,
      background: 'red',
    }} />
  );
};