React表单与事件

2020-05-09

HTML表单元素与React中的其他DOM元素有所不同，因为表单元素生来就保留一些内部状态。
在HTML当中，想,,和<select>这类表单元素会维持自身状态,并根据用户输入进行更新,但在React中,可变的状态通常保存在组件的状态属性中，并且只能用setState()方法进行更新。 <h2 id="一个简单的实例"><a href="#一个简单的实例" class="headerlink" title="一个简单的实例"></a>一个简单的实例</h2>在实例中我们设置了输入框input值value={this.state.data}。在输入框发生变化时我们可以更新state.我们可以使用onChange事件来监听input的变化,并修改state. <figure class="highlight plain"><table><tr><td class="gutter"><pre>1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 </pre></td><td class="code"><pre>class HelloMessage extends React.Component{ constructor(props){ super(props); this.state={value: 'Hello Runoob!'}; this.handleChange=this.handleChange.bind(this); } handleChange(event){ this.setState({value:event.target.value}); } render(){ var value = this.state.value; return <div> <input type="text" value={value} onChange={this.handleChange} /> </div>; } } ReactDOM.render( <HelloMessage />, document.getElementById('example') ); </pre></td></tr></table></figure> 上面代码将要渲染出一个值为Hello Runoob!的input元素，并且通过onChange事件响应更新用户输入的值。 <h2 id="实例2"><a href="#实例2" class="headerlink" title="实例2"></a>实例2</h2>在以下实例中我们将为大家演示如何在子组件上使用表单，onChange方法将触发state的更新并将更新的值传递到子组件的输入框的value上来重新渲染界面。 你需要在父组件通过创建事件句柄(handleChange)，并作为prop(updateStateProp)传递到你的子组件上。 <figure class="highlight plain"><table><tr><td class="gutter"><pre>1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 </pre></td><td class="code"><pre><!DOCTYPE html> <html> <head> <meta charset="UTF-8" /> <title>菜鸟教程 React 实例</title> <script src="https://cdn.staticfile.org/react/15.4.2/react.min.js"></script> <script src="https://cdn.staticfile.org/react/15.4.2/react-dom.min.js"></script> <script src="https://cdn.staticfile.org/babel-standalone/6.22.1/babel.min.js"></script> </head> <body> <div id="example"></div> <script type="text/babel"> var Content = React.createClass({ render: function() { return <div> <input type="text" value={this.props.myDataProp} onChange={this.props.updateStateProp} /> <h4>{this.props.myDataProp}</h4> </div>; } }); var HelloMessage = React.createClass({ getInitialState: function() { return {value: 'Hello Runoob!'}; }, handleChange: function(event) { this.setState({value: event.target.value}); }, render: function() { var value = this.state.value; return <div> <Content myDataProp = {value} updateStateProp = {this.handleChange}></Content> </div>; } }); ReactDOM.render( <HelloMessage />, document.getElementById('example') ); </script> </body> </html> </pre></td></tr></table></figure> <h2 id="Select下拉菜单"><a href="#Select下拉菜单" class="headerlink" title="Select下拉菜单"></a>Select下拉菜单</h2>在React中，不适用selected属性，而在根select标签上用value属性来表示选中项。 <figure class="highlight plain"><table><tr><td class="gutter"><pre>1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 </pre></td><td class="code"><pre>class FlavorForm extends React.Component{ constructor(props){ super(props); this.state = {value: 'coconut'}; this.handleChange=this.handleChange.bind(this); this.handleSubmit=this.handleSumit.bind(this); } handleChange(event){ alert('Yout facorite flavor is:' +this.state.value); event.preventDefault(); } render() { return ( <form onSubmit={this.handleSubmit}> <label> 选择您最喜欢的网站 <select value={this.state.value} onChange={this.handleChange}> <option value="gg">Google</option> <option value="rn">Runoob</option> <option value="tb">Taobao</option> <option value="fb">Facebook</option> </select> </label> <input type="submit" value="提交" /> </form> ); } } ReactDOM.render( <FlavorForm />, document.getElementById('example') ); </pre></td></tr></table></figure> <h2 id="多个表单"><a href="#多个表单" class="headerlink" title="多个表单"></a>多个表单</h2>当你有处理多个 input 元素时，你可以通过给每个元素添加一个 name 属性，来让处理函数根据 event.target.name 的值来选择做什么。 <figure class="highlight plain"><table><tr><td class="gutter"><pre>1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 </pre></td><td class="code"><pre>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 = target.type === 'checkbox' ? target.checked : target.value; const name = target.name; this.setState({ [name]: value }); } render() { return ( <form> <label> 是否离开: <input name="isGoing" type="checkbox" checked={this.state.isGoing} onChange={this.handleInputChange} /> </label> <label> 访客数: <input name="numberOfGuests" type="number" value={this.state.numberOfGuests} onChange={this.handleInputChange} /> </label> </form> ); } } </pre></td></tr></table></figure> <h2 id="React-事件"><a href="#React-事件" class="headerlink" title="React 事件"></a>React 事件</h2><figure class="highlight plain"><table><tr><td class="gutter"><pre>1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 </pre></td><td class="code"><pre>class HelloMessage extends React.Component { constructor(props) { super(props); this.state = {value: 'Hello Runoob!'}; this.handleChange = this.handleChange.bind(this); } handleChange(event) { this.setState({value: '菜鸟教程'}) } render() { var value = this.state.value; return <div> <button onClick={this.handleChange}>点我</button> <h4>{value}</h4> </div>; } } ReactDOM.render( <HelloMessage />, document.getElementById('example') ); </pre></td></tr></table></figure> 当你需要从子组件中更新父组件的 state 时，你需要在父组件通过创建事件句柄 (handleChange) ，并作为 prop (updateStateProp) 传递到你的子组件上。实例如下： <figure class="highlight plain"><table><tr><td class="gutter"><pre>1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 </pre></td><td class="code"><pre>class Content extends React.Component { render() { return <div> <button onClick = {this.props.updateStateProp}>点我</button> <h4>{this.props.myDataProp}</h4> </div> } } class HelloMessage extends React.Component { constructor(props) { super(props); this.state = {value: 'Hello Runoob!'}; this.handleChange = this.handleChange.bind(this); } handleChange(event) { this.setState({value: '菜鸟教程'}) } render() { var value = this.state.value; return <div> <Content myDataProp = {value} updateStateProp = {this.handleChange}></Content> </div>; } } ReactDOM.render( <HelloMessage />, document.getElementById('example') ); </pre></td></tr></table></figure> </div> <div class="article-info article-info-index"> <div class="article-tag tagcloud"> <ul class="article-tag-list"> <li class="article-tag-list-item"> <a href="javascript:void(0)" class="js-tag article-tag-list-link color1">React</a> </li> </ul> </div> <div class="clearfix"></div> </div> </div> </article> <nav id="article-nav"> <a href="/2020/05/11/React-Refs/" id="article-nav-newer" class="article-nav-link-wrap"> <div class="article-nav-title"> React Refs </div> </a> <a href="/2020/05/09/React-AJAX/" id="article-nav-older" class="article-nav-link-wrap"> <div class="article-nav-title">React AJAX</div> </a> </nav> <aside class="wrap-side-operation"> 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