学习React(25) - 介绍refs to DOM elements

    技术2026-08-06  18

    这篇博文是讲,如何attach refs to DOM elements and also class component in react.

    咋们就直接上代码:

    // Input.js 文件 import React, { Component } from 'react' class Input extends Component { constructor(props) { super(props) this.inputRef = React.createRef() } focusInput() { this.inputRef.current.focus() } render() { return ( <div> <input type="text" ref={this.inputRef}/> </div> ) } } export default Input // FocusInput.js 文件 // 这个文件是parent 文件 import React, { Component } from 'react' import Input from './Input' class FocusInput extends Component { constructor(props) { super(props) this.componentRef = React.createRef() } clickHandler = () => { this.componentRef.current.focusInput() } render() { return ( <div> <Input ref={this.componentRef}/> <button onClick={this.clickHandler}>Focus Input</button> </div> ) } } export default FocusInput

    在App.js 文件里

    // App.js 文件 import React from 'react'; import './App.css'; import FocusInput from './FocusInput' function App() { return ( <div className="App"> <FocusInput/> </div> ); } export default App;

    结果如下: 当我点击Focus Input 按钮时,上面的方框会有响应。


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