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
在这里尝试了许多方法之后,我决定使用github.com/Pomax/react-onclickoutside,因为它非常完整。
我通过npm安装了模块并将其导入到组件中:
import onClickOutside from 'react-onclickoutside'
然后,在组件类中,我定义了handleClickOutside方法:
handleClickOutside = () => {
console.log('onClickOutside() method called')
}
导出组件时,我将其包装在onClickOutside()中:
export default onClickOutside(NameOfComponent)
就是这样。
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>
);
}
}
非侵入性方式无需添加另一个DIV EL。
注意:React可能会说findDomNode已弃用,但到目前为止,我还没有遇到任何问题
@异常:单击要忽略的类
@idException:单击时忽略的id
import React from "react"
import ReactDOM from "react-dom"
type Func1<T1, R> = (a1: T1) => R
export function closest(
el: Element,
fn: (el: Element) => boolean
): Element | undefined {
let el_: Element | null = el;
while (el_) {
if (fn(el_)) {
return el_;
}
el_ = el_.parentElement;
}
}
let instances: ClickOutside[] = []
type Props = {
idException?: string,
exceptions?: (string | Func1<MouseEvent, boolean>)[]
handleClickOutside: Func1<MouseEvent, void>
}
export default class ClickOutside extends React.Component<Props> {
static defaultProps = {
exceptions: []
};
componentDidMount() {
if (instances.length === 0) {
document.addEventListener("mousedown", this.handleAll, true)
window.parent.document.addEventListener(
"mousedown",
this.handleAll,
true
)
}
instances.push(this)
}
componentWillUnmount() {
instances.splice(instances.indexOf(this), 1)
if (instances.length === 0) {
document.removeEventListener("mousedown", this.handleAll, true)
window.parent.document.removeEventListener(
"mousedown",
this.handleAll,
true
)
}
}
handleAll = (e: MouseEvent) => {
const target: HTMLElement = e.target as HTMLElement
if (!target) return
instances.forEach(instance => {
const { exceptions, handleClickOutside: onClickOutside, idException } = instance.props as Required<Props>
let exceptionsCount = 0
if (exceptions.length > 0) {
const { functionExceptions, stringExceptions } = exceptions.reduce(
(acc, exception) => {
switch (typeof exception) {
case "function":
acc.functionExceptions.push(exception)
break
case "string":
acc.stringExceptions.push(exception)
break
}
return acc
},
{ functionExceptions: [] as Func1<MouseEvent, boolean>[], stringExceptions: [] as string[] }
)
if (functionExceptions.length > 0) {
exceptionsCount += functionExceptions.filter(
exception => exception(e) === true
).length
}
if (exceptionsCount === 0 && stringExceptions.length > 0) {
const el = closest(target, (e) => stringExceptions.some(ex => e.classList.contains(ex)))
if (el) {
exceptionsCount++
}
}
}
if (idException) {
const target = e.target as HTMLDivElement
if (document.getElementById(idException)!.contains(target)) {
exceptionsCount++
}
}
if (exceptionsCount === 0) {
// eslint-disable-next-line react/no-find-dom-node
const node = ReactDOM.findDOMNode(instance)
if (node && !node.contains(target)) {
onClickOutside(e)
}
}
})
};
render() {
return React.Children.only(this.props.children)
}
}
用法
<ClickOutside {...{ handleClickOutside: () => { alert('Clicked Outside') } }}>
<div >
<div>Breathe</div>
</div>
</ClickOutside>
我有一个需要有条件地将孩子插入模态的例子。像这样,贝娄。
const [view, setView] = useState(VIEWS.SomeView)
return (
<Modal onClose={onClose}>
{VIEWS.Result === view ? (
<Result onDeny={() => setView(VIEWS.Details)} />
) : VIEWS.Details === view ? (
<Details onDeny={() => setView(VIEWS.Result) /> />
) : null}
</Modal>
)
所以parent.contains(event.target)在这里不起作用,因为一旦分离了子级,parent(modal)就不再包含event.targe。
我的解决方案(到目前为止有效,没有任何问题)是这样写:
const listener = (event: MouseEvent) => {
if (parentNodeRef && !event.path.includes(parentNodeRef)) callback()
}
若父级包含已经分离的树中的元素,那个么它不会触发回调。
编辑:event.path是新的,尚未在所有浏览器中退出。请改用composedPath。