我正在寻找一种方法来检测单击事件是否发生在组件之外,如本文所述。jQueryclosest()用于查看单击事件的目标是否将dom元素作为其父元素之一。如果存在匹配项,则单击事件属于其中一个子项,因此不被视为在组件之外。

因此,在我的组件中,我想将一个单击处理程序附加到窗口。当处理程序启动时,我需要将目标与组件的dom子级进行比较。

click事件包含类似“path”的财产,它似乎保存了事件经过的dom路径。我不知道该比较什么,或者如何最好地遍历它,我想肯定有人已经把它放在了一个聪明的效用函数中。。。不


当前回答

import React, { useState, useEffect, useRef } from "react";

const YourComponent: React.FC<ComponentProps> = (props) => {
  const ref = useRef<HTMLDivElement | null>(null);
  const [myState, setMyState] = useState(false);
  useEffect(() => {
    const listener = (event: MouseEvent) => {
      // we have to add some logic to decide whether or not a click event is inside of this editor
      // if user clicks on inside the div we dont want to setState
      // we add ref to div to figure out whether or not a user is clicking inside this div to determine whether or not event.target is inside the div
      if (
        ref.current &&
        event.target &&
        // contains is expect other: Node | null
        ref.current.contains(event.target as Node)
      ) {
        return;
      }
      // if we are outside
      setMyState(false);
    };
    // anytime user clics anywhere on the dom, that click event will bubble up into our body element
    // without { capture: true } it might not work
    document.addEventListener("click", listener, { capture: true });
    return () => {
      document.removeEventListener("click", listener, { capture: true });
    };
  }, []);

  return (
    <div  ref={ref}>
      ....
    </div>
  );
};

其他回答

@ford04提案的字体+简化版:

使用OuterClick API

const Client = () => {
  const ref = useOuterClick<HTMLDivElement>(e => { /* Custom-event-handler */ });
  return <div ref={ref}> Inside </div> 
};

实施

export default function useOuterClick<T extends HTMLElement>(callback: Function) {
  const callbackRef = useRef<Function>(); // initialize mutable ref, which stores callback
  const innerRef = useRef<T>(null); // returned to client, who marks "border" element

  // update cb on each render, so second useEffect has access to current value
  useEffect(() => { callbackRef.current = callback; });

  useEffect(() => {
    document.addEventListener("click", _onClick);
    return () => document.removeEventListener("click", _onClick);
    function _onClick(e: any): void {
      const clickedOutside = !(innerRef.current?.contains(e.target));
      if (clickedOutside)
        callbackRef.current?.(e);
    }
  }, []); // no dependencies -> stable click listener

  return innerRef; // convenience for client (doesn't need to init ref himself)
}

你可以用一个简单的方法来解决你的问题,我向你展示:

....

const [dropDwonStatus , setDropDownStatus] = useState(false)

const openCloseDropDown = () =>{
 setDropDownStatus(prev => !prev)
}

const closeDropDown = ()=> {
 if(dropDwonStatus){
   setDropDownStatus(false)
 }
}
.
.
.
<parent onClick={closeDropDown}>
 <child onClick={openCloseDropDown} />
</parent>

这对我有用,祝你好运;)

我从下面的文章中发现了这一点:

render(){返回({this.node=节点;}}>切换弹出窗口{this.state.popupVisible&&(我是个酒鬼!)});}}

这里有一篇关于这个问题的精彩文章:“处理React组件外部的点击”https://larsgraubner.com/handle-outside-clicks-react/

您只需在主体上安装一个双击处理程序,并在此元素上安装另一个。在该元素的处理程序中,只需返回false以防止事件传播。因此,当双击发生时,如果它在元素上,它将被捕获,并且不会传播到主体上的处理程序。否则它会被身体上的处理程序抓住。

更新:如果你真的不想阻止事件传播,你只需要使用closest来检查点击是发生在你的元素还是他的一个孩子身上:

<html>
<head>
<script src="https://code.jquery.com/jquery-2.1.4.min.js"></script>
<script>
$(document).on('click', function(event) {
    if (!$(event.target).closest('#div3').length) {
    alert("outside");
    }
});
</script>
</head>
<body>
    <div style="background-color:blue;width:100px;height:100px;" id="div1"></div>
    <div style="background-color:red;width:100px;height:100px;" id="div2"></div>
    <div style="background-color:green;width:100px;height:100px;" id="div3"></div>
    <div style="background-color:yellow;width:100px;height:100px;" id="div4"></div>
    <div style="background-color:grey;width:100px;height:100px;" id="div5"></div>
</body>
</html>

更新:不带jQuery:

<html>
<head>
<script>
function findClosest (element, fn) {
  if (!element) return undefined;
  return fn(element) ? element : findClosest(element.parentElement, fn);
}
document.addEventListener("click", function(event) {
    var target = findClosest(event.target, function(el) {
        return el.id == 'div3'
    });
    if (!target) {
        alert("outside");
    }
}, false);
</script>
</head>
<body>
    <div style="background-color:blue;width:100px;height:100px;" id="div1"></div>
    <div style="background-color:red;width:100px;height:100px;" id="div2"></div>
    <div style="background-color:green;width:100px;height:100px;" id="div3">
        <div style="background-color:pink;width:50px;height:50px;" id="div6"></div>
    </div>
    <div style="background-color:yellow;width:100px;height:100px;" id="div4"></div>
    <div style="background-color:grey;width:100px;height:100px;" id="div5"></div>
</body>
</html>

因为对我来说!ref.current.contains(e.target)无法工作,因为ref中包含的DOM元素正在更改,我提出了一个稍微不同的解决方案:

function useClickOutside<T extends HTMLElement>(
  element: T | null,
  onClickOutside: () => void,
) {
  useEffect(() => {
    function handleClickOutside(event: MouseEvent) {
      const xCoord = event.clientX;
      const yCoord = event.clientY;

      if (element) {
        const { right, x, bottom, y } = element.getBoundingClientRect();
        if (xCoord < right && xCoord > x && yCoord < bottom && yCoord > y) {
          return;
        }

        onClickOutside();
      }
    }

    document.addEventListener('click', handleClickOutside);
    return () => {
      document.removeEventListener('click', handleClickOutside);
    };
  }, [element, onClickOutside]);