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What are controlled components in react

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What are controlled components in react

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Apr 21, 2022 pm 04:51 PM

react

In React, a controlled component is a component that uses state to get and set the value of an input element; it can also be understood that the React component that renders the form also controls the operations that occur on the form during the user input process, and is used by React to Form input elements that control their values in this way are called controlled components.

What are controlled components in react

The operating environment of this tutorial: Windows 10 system, react17.0.1 version, Dell G3 computer.

What are controlled components in react

The React official website explains controlled components like this: The React component that renders the form also controls the operations that occur on the form during user input. Form input elements whose values are controlled by React in this way are called "controlled components".

Components that use state to get and set input element values are called controlled components. Tags such as , and <select> can all use the value attribute to implement controlled components. </p> <p>Some netizens explained this: In React, whenever the state of the form changes, it will be written to the state of the component. This type of component is called a controlled component in React. </p> <p>Update process of controlled components: </p> <p>1, you can set the default value of the form in the initial state</p> <p>2, whenever the value of the form changes, call onChange event handler, </p> <p>3, the event handler gets the changed state through the event object e, and changes the state; </p> <p>4, setState triggers the view update to complete the update of the form component value</p> <p><strong>Example: input</strong></p> <p>- Prevent form submission</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">Copy after login</div></div><p>- file type 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">Copy after login</div></div><p>Recommended learning: "<a href="https://www.php.cn/course/list/21.html" target="_blank">react Video tutorial</a>》</p><p>The above is the detailed content of What are controlled components in react. 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Closures in useEffect and useCallback, etc.</p> </div> </div> <a href="https://www.php.cn/web-designer.html" class="phpgenera_Details_mainL4_botton"> <span>See all articles</span> <img src="/static/imghw/down_right.png" alt="" /> </a> </div> </div> </div> </main> <footer> <div class="footer"> <div class="footertop"> <img src="/static/imghw/logo.png" alt=""> <p>Public welfare online PHP training，Help PHP learners grow quickly！</p> </div> <div class="footermid"> <a href="https://www.php.cn/about/us.html">About us</a> <a href="https://www.php.cn/about/disclaimer.html">Disclaimer</a> <a href="https://www.php.cn/update/article_0_1.html">Sitemap</a> </div> <div class="footerbottom"> <p> © php.cn All rights reserved </p> </div> </div> </footer> <input type="hidden" id="verifycode" value="/captcha.html"> <script>layui.use(['element', 'carousel'], function () {var element = layui.element;$ = layui.jquery;var carousel = layui.carousel;carousel.render({elem: '#test1', width: '100%', height: '330px', arrow: 'always'});$.getScript('/static/js/jquery.lazyload.min.js', function () {$("img").lazyload({placeholder: "/static/images/load.jpg", effect: "fadeIn", threshold: 200, skip_invisible: false});});});</script> <script src="/static/js/common_new.js"></script> <script type="text/javascript" src="/static/js/jquery.cookie.js?1746018754"></script> <script src="https://vdse.bdstatic.com//search-video.v1.min.js"></script> <link rel='stylesheet' id='_main-css' href='/static/css/viewer.min.css?2' type='text/css' media='all' /> <script type='text/javascript' src='/static/js/viewer.min.js?1'></script> <script type='text/javascript' src='/static/js/jquery-viewer.min.js'></script> <script type="text/javascript" src="/static/js/global.min.js?5.5.53"></script> <script> var _paq = window._paq = window._paq || []; /* tracker methods like "setCustomDimension" should be called before "trackPageView" */ _paq.push(['trackPageView']); _paq.push(['enableLinkTracking']); (function () { var u = "https://tongji.php.cn/"; _paq.push(['setTrackerUrl', u + 'matomo.php']); _paq.push(['setSiteId', '9']); var d = document, g = d.createElement('script'), s = d.getElementsByTagName('script')[0]; g.async = true; g.src = u + 'matomo.js'; s.parentNode.insertBefore(g, s); })(); </script> <script> // top layui.use(function () { var util = layui.util; util.fixbar({ on: { mouseenter: function (type) { layer.tips(type, this, { tips: 4, fixed: true, }); }, mouseleave: function (type) { layer.closeAll("tips"); }, }, }); }); document.addEventListener("DOMContentLoaded", (event) => { // 定义一个函数来处理滚动链接的点击事件 function setupScrollLink(scrollLinkId, targetElementId) { const scrollLink = document.getElementById(scrollLinkId); const targetElement = document.getElementById(targetElementId); if (scrollLink && targetElement) { scrollLink.addEventListener("click", (e) => { e.preventDefault(); // 阻止默认链接行为 targetElement.scrollIntoView({ behavior: "smooth" }); // 平滑滚动到目标元素 }); } else { console.warn( `Either scroll link with ID '${scrollLinkId}' or target element with ID '${targetElementId}' not found.` ); } } // 使用该函数设置多个滚动链接 setupScrollLink("Article_Details_main1L2s_1", "article_main_title1"); setupScrollLink("Article_Details_main1L2s_2", "article_main_title2"); setupScrollLink("Article_Details_main1L2s_3", "article_main_title3"); setupScrollLink("Article_Details_main1L2s_4", "article_main_title4"); setupScrollLink("Article_Details_main1L2s_5", "article_main_title5"); setupScrollLink("Article_Details_main1L2s_6", "article_main_title6"); // 可以继续添加更多的滚动链接设置 }); window.addEventListener("scroll", function () { var fixedElement = document.getElementById("Article_Details_main1Lmain"); var scrollTop = window.scrollY || document.documentElement.scrollTop; // 兼容不同浏览器 var clientHeight = window.innerHeight || document.documentElement.clientHeight; // 视口高度 var scrollHeight = document.documentElement.scrollHeight; // 页面总高度 // 计算距离底部的距离 var distanceToBottom = scrollHeight - scrollTop - clientHeight; // 当距离底部小于或等于300px时，取消固定定位 if (distanceToBottom <= 980) { fixedElement.classList.remove("Article_Details_main1Lmain"); fixedElement.classList.add("Article_Details_main1Lmain_relative"); } else { // 否则，保持固定定位 fixedElement.classList.remove("Article_Details_main1Lmain_relative"); fixedElement.classList.add("Article_Details_main1Lmain"); } }); </script> <script> document.addEventListener('DOMContentLoaded', function() { const mainNav = document.querySelector('.Article_Details_main1Lmain'); const header = document.querySelector('header'); if (mainNav) { window.addEventListener('scroll', function() { const scrollPosition = window.scrollY; if (scrollPosition > 84) { mainNav.classList.add('fixed'); } else { mainNav.classList.remove('fixed'); } }); } }); </script> </body> </html>