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 { useClickAway } from "react-use";

useClickAway(ref, () => console.log('OUTSIDE CLICKED'));

其他回答

这是我的方法(演示-https://jsfiddle.net/agymay93/4/):

我创建了一个名为WatchClickOutside的特殊组件,它可以像这样使用(我假设JSX语法):

<WatchClickOutside onClickOutside={this.handleClose}>
  <SomeDropdownEtc>
</WatchClickOutside>

以下是WatchClickOutside组件的代码:

import React, { Component } from 'react';

export default class WatchClickOutside extends Component {
  constructor(props) {
    super(props);
    this.handleClick = this.handleClick.bind(this);
  }

  componentWillMount() {
    document.body.addEventListener('click', this.handleClick);
  }

  componentWillUnmount() {
    // remember to remove all events to avoid memory leaks
    document.body.removeEventListener('click', this.handleClick);
  }

  handleClick(event) {
    const {container} = this.refs; // get container that we'll wait to be clicked outside
    const {onClickOutside} = this.props; // get click outside callback
    const {target} = event; // get direct click event target

    // if there is no proper callback - no point of checking
    if (typeof onClickOutside !== 'function') {
      return;
    }

    // if target is container - container was not clicked outside
    // if container contains clicked target - click was not outside of it
    if (target !== container && !container.contains(target)) {
      onClickOutside(event); // clicked outside - fire callback
    }
  }

  render() {
    return (
      <div ref="container">
        {this.props.children}
      </div>
    );
  }
}

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>
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>
  );
};

所以我遇到了一个类似的问题,但在我的案例中,这里选择的答案不起作用,因为我有一个下拉菜单按钮,这是文档的一部分。因此,单击该按钮也会触发handleClickOutside函数。为了防止触发,我必须向按钮和这个添加一个新的引用!menuBtnRef.current.contents(e.target)设置为条件。如果有人像我一样面临同样的问题,我就把它留在这里。

下面是组件现在的样子:


const Component = () => {

    const [isDropdownOpen, setIsDropdownOpen] = useState(false);
    const menuRef     = useRef(null);
    const menuBtnRef  = useRef(null);

    const handleDropdown = (e) => {
        setIsDropdownOpen(!isDropdownOpen);
    }

    const handleClickOutside = (e) => {
        if (menuRef.current && !menuRef.current.contains(e.target) && !menuBtnRef.current.contains(e.target)) {
            setIsDropdownOpen(false);
        }
    }

    useEffect(() => {
        document.addEventListener('mousedown', handleClickOutside, true);
        return () => {
            document.removeEventListener('mousedown', handleClickOutside, true);
        };
    }, []);

    return (

           <button ref={menuBtnRef} onClick={handleDropdown}></button>

           <div ref={menuRef} className={`${isDropdownOpen ? styles.dropdownMenuOpen : ''}`}>
                // ...dropdown items
           </div>
    )
}

我在discuss.reactjs.org上找到了一个解决方案,这要感谢Ben Alpert。单击我的树中的一个组件会导致一个重新阅读程序,在更新时删除了单击的元素。由于React的重读发生在调用文档正文处理程序之前,因此元素未被检测为“在”树中。

解决方案是在应用程序根元素上添加处理程序。

主要:

window.__myapp_container = document.getElementById('app')
React.render(<App/>, window.__myapp_container)

组件:

import { Component, PropTypes } from 'react';
import ReactDOM from 'react-dom';

export default class ClickListener extends Component {

  static propTypes = {
    children: PropTypes.node.isRequired,
    onClickOutside: PropTypes.func.isRequired
  }

  componentDidMount () {
    window.__myapp_container.addEventListener('click', this.handleDocumentClick)
  }

  componentWillUnmount () {
    window.__myapp_container.removeEventListener('click', this.handleDocumentClick)
  }

  /* using fat arrow to bind to instance */
  handleDocumentClick = (evt) => {
    const area = ReactDOM.findDOMNode(this.refs.area);

    if (!area.contains(evt.target)) {
      this.props.onClickOutside(evt)
    }
  }

  render () {
    return (
      <div ref='area'>
       {this.props.children}
      </div>
    )
  }
}