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react中受控组件是啥

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react中受控组件是啥

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Apr 21, 2022 pm 04:51 PM

react

在react中，受控组件是用state来获取和设置输入元素值的组件；也可以理解为渲染表单的React组件还控制着用户输入过程中表单发生的操作，被React以这种方式控制取值的表单输入元素就叫做受控组件。

react中受控组件是啥

本教程操作环境：Windows10系统、react17.0.1版、Dell G3电脑。

react中受控组件是啥

React官网中对于受控组件是这样解释的：渲染表单的 React 组件还控制着用户输入过程中表单发生的操作。被 React 以这种方式控制取值的表单输入元素就叫做“受控组件”。

用state来获取和设置输入元素值的组件，称之为受控组件。, 和 <select> 等标签都可用 value 属性，来实现受控组件。</p> <p>有网友这样解释：在React中，每当表单的状态发生变化时，都会被写入到组件的state中，这种组件在React被称为受控组件。</p> <p>受控组件的更新流程：</p> <p>1，可以通过在初始state中设置表单的默认值</p> <p>2，每当表单的值发生变化时，调用onChange事件处理器，</p> <p>3，事件处理器通过事件对象e拿到改变后的状态，改变state；</p> <p>4，setState触发视图更新，完成表单组件值的更新</p> <p><strong>示例：input</strong></p> <p>- 阻止表单提交</p><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class='brush:php;toolbar:false;'>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={this.state.value} onChange={this.handleChange} /> </label> <input type="submit" value="提交" /> </form> ); } }</pre><div class="contentsignin">登录后复制</div></div><p>- file类型input</p><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class='brush:php;toolbar:false;'>// file类型的input，属性value是只读的，所以是非受控组件 <input type="file" /></pre><div class="contentsignin">登录后复制</div></div><p>推荐学习：《<a href="https://www.php.cn/course/list/21.html" target="_blank">react视频教程</a>》</p><p>以上是react中受控组件是啥的详细内容。更多信息请关注PHP中文网其他相关文章！</p> </div> </div> <div class="wzconShengming_sp"> <div class="bzsmdiv_sp">本站声明</div> <div>本文内容由网友自发贡献，版权归原作者所有，本站不承担相应法律责任。如您发现有涉嫌抄袭侵权的内容，请联系admin@php.cn</div> </div> </div> <ins class="adsbygoogle" style="display:block" data-ad-format="autorelaxed" data-ad-client="ca-pub-5902227090019525" data-ad-slot="2507867629"></ins> <script> (adsbygoogle = window.adsbygoogle || []).push({}); </script> <div class="AI_ToolDetails_main4sR"> <ins class="adsbygoogle" style="display:block" data-ad-client="ca-pub-5902227090019525" data-ad-slot="3653428331" data-ad-format="auto" data-full-width-responsive="true"></ins> <script> (adsbygoogle = window.adsbygoogle || []).push({}); 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