前言
react中的受控组件和非受控组件
内容
定义一个包含表单的组件,输入用户名密码后, 点击登录提示输入信息
理解
包含表单组件的分类非受控组件,受控组件
非受控组件
<!doctype html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0"> <meta http-equiv="X-UA-Compatible" content="ie=edge"> <title>Document</title> </head> <body> <!--创建"容器"--> <div id="login"></div> <!--引入react核心库--> <script type="text/javascript" src="../js/react.development.js"></script> <!--引入react-dom,用于支持react操作DOM--> <script type="text/javascript" src="../js/react-dom.development.js"></script> <!--引入babel,用于将jsx转js--> <script type="text/javascript" src="../js/babel.min.js"></script> <script type="text/babel"> class Login extends React.Component { handleSubmit = (event) => { event.preventDefault() //阻止表单提交 const {username, password} = this alert(`你输入的用户名是: ${username.value}, 你输入的密码是: ${password.value}`) } render() { return ( <div> <form onSubmit={this.handleSubmit}> 用户名: <input ref={ c => this.username = c } name="username" type="text"/> 密 码: <input ref={ c => this.password = c } name="password" type="password"/> <button>登录</button> </form> </div> ); } } ReactDOM.render(<Login />, document.getElementById('login')) </script> </body> </html>
受控组件
<!doctype html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0"> <meta http-equiv="X-UA-Compatible" content="ie=edge"> <title>Document</title> </head> <body> <!--创建"容器"--> <div id="login"></div> <!--引入react核心库--> <script type="text/javascript" src="../js/react.development.js"></script> <!--引入react-dom,用于支持react操作DOM--> <script type="text/javascript" src="../js/react-dom.development.js"></script> <!--引入babel,用于将jsx转js--> <script type="text/javascript" src="../js/babel.min.js"></script> <script type="text/babel"> class Login extends React.Component { state = { username: "", password: "" } saveUserName = (event) => { this.setState({username:event.target.value}) } savePassword = (event) => { this.setState({password:event.target.value}) } handleSubmit = (event) => { event.preventDefault() //阻止表单提交 const {username, password} = this.state alert(`你输入的用户名是: ${username}, 你输入的密码是: ${password}`) } render() { return ( <div> <form onSubmit={this.handleSubmit}> 用户名: <input onChange={this.saveUserName} name="username" type="text"/> 密 码: <input onChange={this.savePassword} name="password" type="password"/> <button>登录</button> </form> </div> ); } } ReactDOM.render(<Login />, document.getElementById('login')) </script> </body> </html>
函数柯里化
<!doctype html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0"> <meta http-equiv="X-UA-Compatible" content="ie=edge"> <title>Document</title> </head> <body> <!--创建"容器"--> <div id="login"></div> <!--引入react核心库--> <script type="text/javascript" src="../js/react.development.js"></script> <!--引入react-dom,用于支持react操作DOM--> <script type="text/javascript" src="../js/react-dom.development.js"></script> <!--引入babel,用于将jsx转js--> <script type="text/javascript" src="../js/babel.min.js"></script> <script type="text/babel"> class Login extends React.Component { state = { username: "", password: "" } saveFormData = (dataType) => { return (event) => { this.setState({[dataType]:event.target.value}) } } handleSubmit = (event) => { event.preventDefault() //阻止表单提交 const {username, password} = this.state alert(`你输入的用户名是: ${username}, 你输入的密码是: ${password}`) } render() { return ( <div> <form onSubmit={this.handleSubmit}> 用户名: <input onChange={this.saveFormData('username')} name="username" type="text"/> 密 码: <input onChange={this.saveFormData('password')} name="password" type="password"/> <button>登录</button> </form> </div> ); } } ReactDOM.render(<Login />, document.getElementById('login')) </script> </body> </html>
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