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
这已经有很多答案了,但它们没有解决e.stopPropagation()和阻止单击要关闭的元素之外的react链接的问题。
由于React有自己的人工事件处理程序,您无法将文档用作事件侦听器的基础。在这之前,您需要e.stopPropagation(),因为React使用文档本身。如果改用document.querySelector('body')。您可以防止点击React链接。下面是我如何实现单击外部并关闭的示例。这使用ES6和React 16.3。
import React, { Component } from 'react';
class App extends Component {
constructor(props) {
super(props);
this.state = {
isOpen: false,
};
this.insideContainer = React.createRef();
}
componentWillMount() {
document.querySelector('body').addEventListener("click", this.handleClick, false);
}
componentWillUnmount() {
document.querySelector('body').removeEventListener("click", this.handleClick, false);
}
handleClick(e) {
/* Check that we've clicked outside of the container and that it is open */
if (!this.insideContainer.current.contains(e.target) && this.state.isOpen === true) {
e.preventDefault();
e.stopPropagation();
this.setState({
isOpen: false,
})
}
};
togggleOpenHandler(e) {
e.preventDefault();
this.setState({
isOpen: !this.state.isOpen,
})
}
render(){
return(
<div>
<span ref={this.insideContainer}>
<a href="#open-container" onClick={(e) => this.togggleOpenHandler(e)}>Open me</a>
</span>
<a href="/" onClick({/* clickHandler */})>
Will not trigger a click when inside is open.
</a>
</div>
);
}
}
export default App;
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
如果您需要typescript版本:
import React, { useRef, useEffect } from "react";
interface Props {
ref: React.MutableRefObject<any>;
}
export const useOutsideAlerter = ({ ref }: Props) => {
useEffect(() => {
const handleClickOutside = (event: MouseEvent) => {
if (ref.current && !ref.current.contains(event.target as Node)) {
//do what ever you want
}
};
// Bind the event listener
document.addEventListener("mousedown", handleClickOutside);
return () => {
// Unbind the event listener on clean up
document.removeEventListener("mousedown", handleClickOutside);
};
}, [ref]);
};
export default useOutsideAlerter;
如果您想扩展它以关闭模态或隐藏某些内容,也可以执行以下操作:
import React, { useRef, useEffect } from "react";
interface Props {
ref: React.MutableRefObject<any>;
setter: React.Dispatch<React.SetStateAction<boolean>>;
}
export const useOutsideAlerter = ({ ref, setter }: Props) => {
useEffect(() => {
const handleClickOutside = (event: MouseEvent) => {
if (ref.current && !ref.current.contains(event.target as Node)) {
setter(false);
}
};
// Bind the event listener
document.addEventListener("mousedown", handleClickOutside);
return () => {
// Unbind the event listener on clean up
document.removeEventListener("mousedown", handleClickOutside);
};
}, [ref, setter]);
};
export default useOutsideAlerter;