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

将onClick处理程序添加到顶级容器中,并在用户单击时增加状态值。将该值传递给相关组件,每当该值发生变化时,您就可以执行操作。

在本例中,每当clickCount值更改时,我们都会调用this.closeDropdown()。

incrementClickCount方法在.app容器中激发,而不是在下拉列表中激发,因为我们使用event.stopPropagation()来防止事件冒泡。

您的代码可能最终看起来像这样:

class App extends Component {
    constructor(props) {
        super(props);
        this.state = {
            clickCount: 0
        };
    }
    incrementClickCount = () => {
        this.setState({
            clickCount: this.state.clickCount + 1
        });
    }
    render() {
        return (
            <div className="app" onClick={this.incrementClickCount}>
                <Dropdown clickCount={this.state.clickCount}/>
            </div>
        );
    }
}
class Dropdown extends Component {
    constructor(props) {
        super(props);
        this.state = {
            open: false
        };
    }
    componentDidUpdate(prevProps) {
        if (this.props.clickCount !== prevProps.clickCount) {
            this.closeDropdown();
        }
    }
    toggleDropdown = event => {
        event.stopPropagation();
        return (this.state.open) ? this.closeDropdown() : this.openDropdown();
    }
    render() {
        return (
            <div className="dropdown" onClick={this.toggleDropdown}>
                ...
            </div>
        );
    }
}

其他回答

只需使用mui(material ui)中的ClickAwayListener:

<ClickAwayListener onClickAway={handleClickAway}>
    {children}
<ClickAwayListener >

有关更多信息,请查看:https://mui.com/base/react-click-away-listener/

基于Tanner Linsley在2020年夏威夷联合会议上的精彩演讲:

使用OuterClick API

const Client = () => {
  const innerRef = useOuterClick(ev => {/*event handler code on outer click*/});
  return <div ref={innerRef}> Inside </div> 
};

实施

function useOuterClick(callback) {
  const callbackRef = useRef(); // initialize mutable ref, which stores callback
  const innerRef = useRef(); // 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", handleClick);
    return () => document.removeEventListener("click", handleClick);
    function handleClick(e) {
      if (innerRef.current && callbackRef.current && 
        !innerRef.current.contains(e.target)
      ) callbackRef.current(e);
    }
  }, []); // no dependencies -> stable click listener
      
  return innerRef; // convenience for client (doesn't need to init ref himself) 
}

下面是一个工作示例:

/*自定义挂钩*/函数useOuterClick(回调){const innerRef=useRef();const callbackRef=useRef();//在ref中设置当前回调,然后第二个useEffect使用它useEffect(()=>{//useEffect包装器对于并发模式是安全的callbackRef.current=回调;});使用效果(()=>{document.addEventListener(“单击”,handleClick);return()=>document.removeEventListener(“单击”,handleClick);//从ref中读取最近的回调和innerRefdom节点函数句柄Click(e){如果(内部参考当前&&回调参考当前&&!innerRef.current.contains(e.target)) {callbackRef.current(e);}}}, []); // 无需回调+innerRef-depreturn innerRef;//返回参考;客户端可以省略`useRef`}/*用法*/常量客户端=()=>{const[counter,setCounter]=useState(0);const innerRef=useOuterClick(e=>{//调用处理程序时,计数器状态是最新的alert(`Clicked outside!Increment counter to${counter+1}`);设置计数器(c=>c+1);});返回(<div><p>点击外面</p><div id=“container”ref={innerRef}>内部,计数器:{counter}</div></div>);};ReactDOM.render(<Client/>,document.getElementById(“root”));#容器{边框:1px纯红色;填充:20px;}<script src=“https://cdnjs.cloudflare.com/ajax/libs/react/16.12.0/umd/react.production.min.js“integrity=”sha256-Ef0vObdWpkMAnxp39TYSLVS/vVUokDE8CDFnx7tjY6U=“crossrorigin=”匿名“></script><script src=“https://cdnjs.cloudflare.com/ajax/libs/react-dom/16.12.0/umd/react-dom.production.min.js“integrity=”sha256-p2yuFdE8hNZsQ31Qk+s8N+Me2fL5cc6NKXOC0U9uGw=“crossrorigin=”匿名“></script><script>var{useRef,useEffect,useCallback,useState}=反应</script><div id=“root”></div>

要点

useOuterClick利用可变引用提供瘦客户端API包含组件([]deps)的生命周期的稳定单击侦听器客户端可以设置回调,而无需使用callback将其记忆回调主体可以访问最新的属性和状态-没有过时的闭包值

(iOS的侧注)

iOS通常只将某些元素视为可点击的。要使外部单击有效,请选择一个不同于文档的单击侦听器-不向上包括正文。例如,在React根div上添加一个监听器,并扩展其高度,如height:100vh,以捕捉所有外部点击。来源:quicksmod.org

Ez的方式。。。(2022年更新)

创建挂钩:useOutsideClick.ts

export function useOutsideClick(ref: any, onClickOut: () => void){
    useEffect(() => {
        const onClick = ({target}: any) => !ref.contains(target) && onClickOut?.()
        document.addEventListener("click", onClick);
        return () => document.removeEventListener("click", onClick);
    }, []);
}

将componentRef添加到组件并调用useOutsideClick

export function Example(){

  const componentRef = useRef();

  useOutsideClick(componentRef.current!, () => {
   // do something here
  });

  return ( 
    <div ref={componentRef as any}> My Component </div>
  )
}

以下解决方案使用ES6并遵循绑定以及通过方法设置ref的最佳实践。

要将其付诸行动:

挂钩实施反应16.3后的类实现反应16.3之前的类实现

挂钩实施:

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 <div ref={wrapperRef}>{props.children}</div>;
}

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 <div ref={this.wrapperRef}>{this.props.children}</div>;
  }
}

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 <div ref={this.setWrapperRef}>{this.props.children}</div>;
  }
}

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;)