检测 React 组件外的点击

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检测 React 组件外的点击

我正在寻找一种方法来检测是否发生了组件外的点击事件,就像这个文章中描述的那样。使用jQuery closest()来查看点击事件的目标是否有dom元素作为其父元素。如果匹配,则点击事件属于其中一个子级,因此不被认为是在组件外发生的。

因此,在我的组件中,我想将点击处理程序附加到window上。当处理程序触发时,我需要将目标与我的组件的dom子级进行比较。

点击事件包含类似于\"path\"的属性,它似乎保存了事件所经过的dom路径。我不确定要比较什么或以什么方式遍历它,并且我认为某人一定已经将其放在一个巧妙的实用函数中了...没有吗?

admin 更改状态以发布 2023年5月23日
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我也遇到了同样的问题。虽然我来晚了,但对我来说,这是一个非常好的解决方案。希望它能对其他人有所帮助。你需要从react-dom中导入findDOMNode

import ReactDOM from 'react-dom';
// ... 
componentDidMount() {
    document.addEventListener('click', this.handleClickOutside, true);
}
componentWillUnmount() {
    document.removeEventListener('click', this.handleClickOutside, true);
}
handleClickOutside = event => {
    const domNode = ReactDOM.findDOMNode(this);
    if (!domNode || !domNode.contains(event.target)) {
        this.setState({
            visible: false
        });
    }
}


React钩子方法(16.8+)

你可以创建一个可重用的钩子方法,叫做useComponentVisible

import { useState, useEffect, useRef } from 'react';
export default function useComponentVisible(initialIsVisible) {
    const [isComponentVisible, setIsComponentVisible] = useState(initialIsVisible);
    const ref = useRef(null);
    const handleClickOutside = (event) => {
        if (ref.current && !ref.current.contains(event.target)) {
            setIsComponentVisible(false);
        }
    };
    useEffect(() => {
        document.addEventListener('click', handleClickOutside, true);
        return () => {
            document.removeEventListener('click', handleClickOutside, true);
        };
    }, []);
    return { ref, isComponentVisible, setIsComponentVisible };
}

然后在你希望添加功能的组件中执行以下操作:

const DropDown = () => {
    const { ref, isComponentVisible } = useComponentVisible(true);
    return (
          {isComponentVisible && (

Dropdown Component

)} ); }

在此处查看codesandbox示例。

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下文解决方案使用ES6,遵循绑定和方法设置引用的最佳实践。

查看实际应用:

Hooks实现:

import React, { useRef, useEffect } from "react";
/**
 * Hook that alerts clicks outside of the passed ref
 */
function useOutsideAlerter(ref) {
  useEffect(() => {
    /**
     * Alert if clicked on outside of element
     */
    function handleClickOutside(event) {
      if (ref.current && !ref.current.contains(event.target)) {
        alert("You clicked outside of me!");
      }
    }
    // Bind the event listener
    document.addEventListener("mousedown", handleClickOutside);
    return () => {
      // Unbind the event listener on clean up
      document.removeEventListener("mousedown", handleClickOutside);
    };
  }, [ref]);
}
/**
 * Component that alerts if you click outside of it
 */
export default function OutsideAlerter(props) {
  const wrapperRef = useRef(null);
  useOutsideAlerter(wrapperRef);
  return {props.children};
}

类实现:

16.3之后

import React, { Component } from "react";
/**
 * Component that alerts if you click outside of it
 */
export default class OutsideAlerter extends Component {
  constructor(props) {
    super(props);
    this.wrapperRef = React.createRef();
    this.handleClickOutside = this.handleClickOutside.bind(this);
  }
  componentDidMount() {
    document.addEventListener("mousedown", this.handleClickOutside);
  }
  componentWillUnmount() {
    document.removeEventListener("mousedown", this.handleClickOutside);
  }
  /**
   * Alert if clicked on outside of element
   */
  handleClickOutside(event) {
    if (this.wrapperRef && !this.wrapperRef.current.contains(event.target)) {
      alert("You clicked outside of me!");
    }
  }
  render() {
    return {this.props.children};
  }
}

16.3之前

import React, { Component } from "react";
/**
 * Component that alerts if you click outside of it
 */
export default class OutsideAlerter extends Component {
  constructor(props) {
    super(props);
    this.setWrapperRef = this.setWrapperRef.bind(this);
    this.handleClickOutside = this.handleClickOutside.bind(this);
  }
  componentDidMount() {
    document.addEventListener("mousedown", this.handleClickOutside);
  }
  componentWillUnmount() {
    document.removeEventListener("mousedown", this.handleClickOutside);
  }
  /**
   * Set the wrapper ref
   */
  setWrapperRef(node) {
    this.wrapperRef = node;
  }
  /**
   * Alert if clicked on outside of element
   */
  handleClickOutside(event) {
    if (this.wrapperRef && !this.wrapperRef.contains(event.target)) {
      alert("You clicked outside of me!");
    }
  }
  render() {
    return {this.props.children};
  }
}

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