react受控组件和不受控组件的区别是什么-前端问答-PHP中文网

react受控组件和不受控组件的区别：1、受控组件依赖于状态，而非受控组件不受状态的控制；2、受控组件只有继承“React.Component”才会有状态，而非受控组件则不是只有继承才有状态；3、受控组件一般适用于需要动态设置初始值时，非受控组件一般用于无任何动态初始值信息时。

react受控组件和不受控组件的区别是什么

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

react受控组件和不受控组件的区别

两者区别

1、受控组件

受控组件依赖于状态

受控组件的修改会实时映射到状态值上，此时可以对输入的内容进行校验

受控组件只有继承React.Component才会有状态

受控组件必须要在表单上使用onChange事件来绑定对应的事件

2、非受控组件

非受控组件不受状态的控制

非受控组件获取数据就是相当于操作DOM

非受控组件可以很容易和第三方组件结合，更容易同时集成 React 和非 React 代码

选择受控组件还是非受控组件

1、受控组件使用场景：一般用在需要动态设置其初始值的情况。例如：某些form表单信息编辑时，input表单元素需要初始显示服务器返回的某个值然后进行编辑。

2、非受控组件使用场景：一般用于无任何动态初始值信息的情况。例如：form表单创建信息时，input表单元素都没有初始值，需要用户输入的情况。

扩展知识：

一、受控组件

在HTML中，表单元素的标签、、<select>等的值改变通常是根据用户输入进行更新。</p> <p>在React中，可变状态通常保存在组件的状态属性中，并且只能使用 setState() 进行更新，而呈现表单的React组件也控制着在后续用户输入时该表单中发生的情况，以这种由React控制的输入表单元素而改变其值的方式，称为受控组件。</p> <p>比如，给表单元素input绑定一个onChange事件，当input状态发生变化时就会触发onChange事件，从而更新组件的state。</p><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:js;toolbar:false">import React, { Component } from 'react' export default class MyInput extends Component{ constructor(props) { super(props); this.state = { value: 0 } } handleChange = (event)=>{ this.setState({ value: event.target.value }) } render(){ return( <div> <input type="text" value={this.state.value} onChange={this.handleChange} /> </div> ) } }</pre><div class="contentsignin">登录后复制</div></div><p>受控组件更新state的流程</p><p>1、可以通过初始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event拿到改变后的状态，并更新组件的state</p><p>4、一旦通过setState方法更新state，就会触发视图的重新渲染，完成表单组件的更新</p><p>React中数据是单项流动的，从示例中，可以看出表单的数据来源于组件的state，并通过props传入，这也称为单向数据绑定。然后又通过onChange事件处理器将新的数据写回到state，完成了双向数据绑定。</p><p><strong>二、非受控组件</strong></p><p>非受控组件指的是，表单数据由DOM本身处理。即不受setState()的控制，与传统的HTML表单输入相似，input输入值即显示最新值。</p><p>在非受控组件中，可以使用一个ref来从DOM获得表单值。</p><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:js;toolbar:false">class NameForm extends React.Component { constructor(props) { super(props); this.handleSubmit = this.handleSubmit.bind(this); } handleSubmit(event) { console.log('A name was submitted: ' + this.input.value); event.preventDefault(); } render() { return ( <form onSubmit={this.handleSubmit}> <label> Name: <input type="text" ref={(input) => this.input = input} /> </label> <input type="submit" value="Submit" /> </form> ); } }</pre><div class="contentsignin">登录后复制</div></div><p>非受控组件在底层实现时是在其内部维护了自己的状态state，这样表现出用户输入任何值都能反应到元素上。</p> <p>【相关推荐：<a href="https://www.php.cn/course/list/17.html" target="_blank" textvalue="javascript视频教程">javascript视频教程</a>、<a href="https://www.php.cn/course/list/1.html" target="_blank">web前端</a>】</p><p>以上是react受控组件和不受控组件的区别是什么的详细内容。更多信息请关注PHP中文网其他相关文章！</p> </div> </div> <div style="height: 25px;"> <div class="wzconBq" style="display: inline-flex;"> <span>相关标签：</span> <div class="wzcbqd"> <a onclick="hits_log(2,'www',this);" href-data="https://www.php.cn/zh/search?word=react" target="_blank">react</a> </div> </div> <div style="display: inline-flex;float: right; color:#333333;">来源：php.cn</div> </div> <div class="wzconOtherwz"> <a href="https://www.php.cn/zh/faq/493276.html" title="react是由哪家公司开发的"> <span>上一篇：react是由哪家公司开发的</span> </a> <a href="https://www.php.cn/zh/faq/493280.html" title="react native是原生app吗"> <span>下一篇：react native是原生app吗</span> </a> </div> <div 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