React的受控组件用法详解！ react.js

一、受控组件是什么？用state来获取和设置输入元素值的组件，称之为受控组件。, </code> 和 <code></code> 等标签都可用 <code>value</code> 属性，来实现受控组件。<br /> 二、有哪些受控组件？ 1、input - 阻止表单提交 <blockquote><code>class NameForm extends React.Component { constructor(props) { super(props); this.state = { value: '' }; this.handleChange = this.handleChange.bind(this); this.handleSubmit = this.handleSubmit.bind(this); }handleChange(event) { this.setState({ value: event.target.value }); }handleSubmit(event) { alert('提交的名字: ' + this.state.value); event.preventDefault(); }render() { return ( <form onSubmit={this.handleSubmit}> <label> 名字: <input type="text" value=https://www.it610.com/article/{this.state.value} onChange={this.handleChange} /> </label> <input type="submit" value="https://www.it610.com/article/提交" /> </form> ); } }</code></blockquote><br /> - file类型input <blockquote><code>// file类型的input，属性value是只读的，所以是非受控组件 <input type="file" /></code></blockquote><br /> - 多个input <blockquote><code>// 多个input时，设置下name属性，即可动态操作，无需硬编码 class Reservation extends React.Component { constructor(props) { super(props); this.state = { isGoing: true, numberOfGuests: 2 }; this.handleInputChange = this.handleInputChange.bind(this); }handleInputChange(event) { const target = event.target; const value = https://www.it610.com/article/target.type ==='checkbox' ? target.checked : target.value; const name = target.name; this.setState({ [name]: value }); }render() { return ( <form> <label> 参与: <input name="isGoing" type="checkbox" checked={this.state.isGoing} onChange={this.handleInputChange} /> </label> <br /> <label> 来宾人数: <input name="numberOfGuests" type="number" value=https://www.it610.com/article/{this.state.numberOfGuests} onChange={this.handleInputChange} /> </label> </form> ); } }</code></blockquote><br /> 2、textarea 用value属性来设置textarea的文本内容：<br /> <blockquote><code>class EssayForm extends React.Component { constructor(props) { super(props); this.state = { value: '请撰写一篇关于你喜欢的 DOM 元素的文章.' }; this.handleChange = this.handleChange.bind(this); this.handleSubmit = this.handleSubmit.bind(this); }handleChange(event) { this.setState({ value: event.target.value }); }handleSubmit(event) { alert('提交的文章: ' + this.state.value); event.preventDefault(); }render() { return ( <form onSubmit={this.handleSubmit}> <label> 文章: <textarea value=https://www.it610.com/article/{this.state.value} onChange={this.handleChange} /> </label> <input type="submit" value="https://www.it610.com/article/提交" /> </form> ); } }</code></blockquote><br /> 3、select <strong>【React的受控组件用法详解！】</strong>传统HTML中，用 <code>selected</code> 来设置选中项，而在React中使用 <code>value</code> 属性：<br /> <blockquote><code>// HTML中使用selected属性 < select > <option value="https://www.it610.com/article/grapefruit">葡萄柚</option> <option value="https://www.it610.com/article/lime">酸橙</option> <option selected value="https://www.it610.com/article/coconut">椰子</option> <option value="https://www.it610.com/article/mango">芒果</option> </code></blockquote><br /> <blockquote><code>// React中使用value属性 class FlavorForm extends React.Component { constructor(props) { super(props); this.state = { value: 'coconut' }; this.handleChange = this.handleChange.bind(this); this.handleSubmit = this.handleSubmit.bind(this); }handleChange(event) { this.setState({ value: event.target.value }); }handleSubmit(event) { alert('你喜欢的风味是: ' + this.state.value); event.preventDefault(); }render() { return ( <form onSubmit={this.handleSubmit}> <label> 选择你喜欢的风味:<option value="https://www.it610.com/article/grapefruit">葡萄柚</option> <option value="https://www.it610.com/article/lime">酸橙</option> <option value="https://www.it610.com/article/coconut">椰子</option> <option value="https://www.it610.com/article/mango">芒果</option></label> <input type="submit" value="https://www.it610.com/article/提交" /> </form> ); } }</code></blockquote><br /> <blockquote><code>// 传递数组给value属性，表示select标签，选中多个选项 </code></blockquote><br /> 参考文档 <ul> <li>React的受控组件用法详解！</li> </ul></p> <div class="dede_pages"><ul></ul></div> <div class="pcd_ad"> 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