Reactでポップアップモーダルボックスを実装する方法

import React, {useMemo, useEffect, useState} from 'react' import ReactDOM from 'react-dom' /** * * 需要把元素渲染到组件之外，用 createPortal 把元素直接渲染到 document.body 下，为了防止函数组件每一次执行都触发 createPortal， 所以通过 useMemo 做性能优化。 因为需要渐变的动画效果，所以需要两个变量 modelShow / modelShowAync 来控制显示/隐藏，modelShow 让元素显示/隐藏，modelShowAync 控制动画执行。 当弹窗要显示的时候，要先设置 modelShow 让组件显示，然后用 setTimeout 调度让 modelShowAync 触发执行动画。 当弹窗要隐藏的时候，需要先让动画执行，所以先控制 modelShowAync ，然后通过控制 modelShow 元素隐藏，和上述流程相反。 用一个控制器 controlShow 来流畅执行更新任务。 */ // 控制弹窗隐藏以及动画效果 const controlShow = (f1, f2, value, timer) => { f1(value) return setTimeout(() => { f2(value) }, timer) } export const Dialog = (props) => { const {width, visible, closeCb, onClose} = props // 控制 modelShow动画效果 const [modelShow, setModelShow] = useState(visible) const [modelShowAsync, setModelShowAsync] = useState(visible) const renderChildren = useMemo(() => { // 把元素渲染到组件之外的document.body 上 return ReactDOM.createPortal(
 
 
 
 {props.children} 
 
 
 
 onClose && onClose()} style={{opacity: modelShowAsync ? 0.6 : 0}}/> 
, document.body) }, [modelShow, modelShowAsync]) useEffect(() => { let timer if (visible) { // 打开弹窗， timer = controlShow(setModelShow, setModelShowAsync, visible, 30) } else { timer = controlShow(setModelShowAsync,setModelShow,visible,1000) } return () => { timer && clearTimeout(timer) } }, [visible]) return renderChildren }

import {Dialog} from "./Dialog"; import React, {useEffect, useState} from 'react' import ReactDOM from 'react-dom' import './style.scss' class Modal extends React.PureComponent { // 渲染底部按钮 renderFooter = () => { const {onOk, onCancel, cancelText, okText, footer} = this.props // 触发onOk / onCancel回调 if (footer && React.isValidElement(footer)) return footer return 
 
  { onOk && onOk(e) }}>{okText || '确定'}   { onCancel && onCancel(e) }}>{cancelText || '取消'}  
 
 } // 渲染底部 renderTop = () => { const {title, onClose} = this.props return 
 
{title}
  onClose && onClose()}>X 
 } // 渲染弹窗内容 renderContent = () => { const {content, children} = this.props return React.isValidElement(content) ? content : children ? children : null } render() { const {visible, width = 500, closeCb, onClose} = this.props return 
 {this.renderTop()} {this.renderContent()} {this.renderFooter()} 
 } } // 静态方法 let ModalContainer = null const modelSymbol = Symbol('$$_model_Container_hidden') // 静态属性show——控制 Modal.show = (config) => { // 如果modal已经存在，name就不需要第二次show if (ModalContainer) return const props = {...config, visible: true} const container = ModalContainer = document.createElement('div') // 创建一个管理者，管理model状态 const manager = container[modelSymbol] = { setShow: null, mounted: false, hidden() { const {setShow} = manager setShow && setShow(false) }, destroy() { // 卸载组件 ReactDOM.unmountComponentAtNode(container) // 移除节点 document.body.removeChild(container) // 置空元素 ModalContainer = null } } const ModelApp = (props) => { const [show, setShow] = useState(false) manager.setShow = setShow const {visible, ...trueProps} = props useEffect(() => { // 加载完成，设置状态 manager.mounted = true setShow(visible) }, []) return  manager.mounted && manager.destroy()} visible={show}/> } // 插入到body中 document.appendChild(container) // 渲染React元素 ReactDOM.render(, container) return manager } Modal.hidden = () => { if(!ModalContainer) return // 如果存在ModalContainer 那么隐藏ModalContainer ModalContainer[modelSymbol] && ModalContainer[modelSymbol].hidden() } export default Modal

$bg-linear-gradien-red-light : linear-gradient(135deg, #fc4838 0%, #f6346b 100%); $bg-linear-gradien-red-dark : linear-gradient(135deg, #fc4838 0%, #f6346b 100%); .constrol{ padding: 30px; width: 500px; border: 1px solid #ccc; height: 200px; } .feel{ padding: 24px; } .model_top{ height: 40px; border-radius: 5px 5px 0 0 ; position: relative; p{ height: 40px; font-weight: bold; line-height: 40px; padding-left: 14px; } background-color: #eee; .model_top_close{ position: absolute; font-size: 16px; cursor: pointer; right: 24px; top: 8px; } } .model_bottom{ height: 50px; padding-top: 10px; .model_btn_box{ display: inline-block; margin-left: 50%; transform: translateX(-50%); } } .model_container{ .model_wrap{ position: absolute; border-radius:5px ; background: #fff; left:50%; top:50%; transform: translate(-50%,-50%); } position: fixed; z-index: 10000; left:0; top:0; transition: opacity 0.3s; right: 0; bottom: 0; } .mast{ background-color: #000; z-index: 9999; } .searchbtn{ background: linear-gradient(135deg, #fc4838 0%, #f6346b 100%); color: #fff; min-width: 96px; height :36px; border :none; border-radius: 18px; font-size: 14px; font-weight: 500; cursor: pointer; margin-left: 20px !important; } .searchbtn:focus{ background: $bg-linear-gradien-red-dark; color: #fff; min-width: 96px; height: 36px; border: none; border-radius: 18px; font-size: 14px; font-weight: 500; cursor: pointer; margin-left: 20px !important; box-shadow: 0 2px 7px 0 #FAA79B; } .searchbtn:hover{ background :$bg-linear-gradien-red-light; color :#fff; min-width: 96px; height :36px; margin-left: 20px !important; border: none; border-radius: 18px; font-size :14px; font-weight: 500; cursor: pointer; box-shadow: 0 2px 7px 0 #FAA79B; } .searchbtn:disabled{ background: #c0c6c6; color :#fff; min-width: 96px; height :36px; font-size :14px; font-weight: 500; border: none; border-radius: 18px; cursor: not-allowed; } .concellbtn{ background :#fff; color :#303133; width: 96px; height: 36px; font-size: 14px; font-weight: 500; border :1px solid #E4E7ED; border-radius: 18px; cursor: pointer; // margin-right: 10px; margin-left: 10px; } .concellbtn:hover{ background :rgba(220, 223, 230, 0.1); color: #303133; width :96px; height: 36px; font-size: 14px; font-weight: 500; border :1px solid #E4E7ED; border-radius: 18px; cursor: pointer; // margin-right: 10px; margin-left: 10px; } .concellbtn:focus{ background :rgba(220, 223, 230, 0.24); color: #303133; width :96px; height: 36px; font-size: 14px; font-weight: 500; border: 1px solid #C0C4CC; border-radius: 18px; cursor: pointer; margin-right: 10px; margin-left: 10px; }

import React, {useState, useMemo} from 'react' import Modal from './customPopup/Modal' /* 挂载方式调用modal */ export default function App() { const [ visible , setVisible ] = useState(false) const [ nameShow , setNameShow ] = useState(false) const handleClick = () => { setVisible(!visible) setNameShow(!nameShow) } /* 防止 Model 的 PureComponent 失去作用 */ const [ handleClose ,handleOk, handleCancel ] = useMemo(()=>{ const Ok = () => console.log('点击确定按钮') const Close = () => setVisible(false) const Cancel = () => console.log('点击取消按钮') return [Close , Ok , Cancel] },[]) return 
  
 内容。。。。。。。 
   { setVisible(!visible) setNameShow(false) }} > model show   model show ( 显示作者 )  
 }