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react中受控元件是啥

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react中受控元件是啥

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Apr 21, 2022 pm 04:51 PM

react

在react中，受控元件是用state來取得和設定輸入元素值的元件；也可以理解為渲染表單的React元件也控制著使用者輸入過程中表單發生的動作，被React以這種方式控制取值的表單輸入元素就叫做受控元件。

react中受控元件是啥

本教學操作環境：Windows10系統、react17.0.1版、Dell G3電腦。

react中受控元件是啥

React官網中對於受控元件是這樣解釋的：渲染表單的 React 元件也控制著使用者輸入過程中表單發生的操作。被 React 以這種方式控制取值的表單輸入元素就叫做「受控元件」。

用state來取得並設定輸入元素值的元件，稱為受控元件。 , 和 <select> 等標籤都可用 value 屬性，以實現受控組件。 </p> <p>有網友這樣解釋：在React中，每當表單的狀態改變時，都會被寫入到元件的state中，這種元件在React稱為受控元件。 </p> <p>受控元件的更新流程：</p> <p>1，可以透過在初始state中設定表單的預設值</p> <p>2，每當表單的值變更時，調用onChange事件處理器，</p> <p>3，事件處理器透過事件物件e拿到改變後的狀態，改變state；</p> <p>4，setState觸發檢視更新，完成表單元件值的更新</p> <p><strong>範例：input</strong></p> <p>- 阻止表單提交</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">登入後複製</div></div><p>- file類型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">登入後複製</div></div><p>推薦學習：《<a href="https://www.php.cn/course/list/21.html" target="_blank">react影片教學</a>》</p><p>以上是react中受控元件是啥的詳細內容。更多資訊請關注PHP中文網其他相關文章！</p> </div> </div> <div class="wzconShengming_sp"> <div class="bzsmdiv_sp">本網站聲明</div> <div>本文內容由網友自願投稿，版權歸原作者所有。本站不承擔相應的法律責任。如發現涉嫌抄襲或侵權的內容，請聯絡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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