CSS | :required 选择器

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📜 CSS | :required 选择器

📅 最后修改于: 2021-08-31 02:19:07 🧑 作者: Mango

required 选择器用于选择具有 required 属性的所需元素并设置 CSS 属性。 Form 元素的必需属性按要求定义。

注意：此选择器与表单元素一起使用，例如。、。</p> <p><strong>句法：</strong> </p> <div class="hcb_wrap"> <pre class="prism line-numbers lang-css" data-lang="CSS"><code class="replace">:required { // CSS Property } </code></pre> </div> <p><strong>例子：</strong> </p> <div class="hcb_wrap"> <pre class="prism line-numbers lang-css" data-lang="CSS"><code class="replace"><!DOCTYPE html> <html> <head> <title>:required Selector</title> <style> h1 { color: green; } body { text-align:center; } input:required { background-color: green; color: white; } form div { padding: 10px; } label { display: block; font-size: 18px; } input { border: 1px solid black; padding: 9px; font-size: 18px; } </style> </head> <body> <h1>GeeksforGeeks</h1> <h2>:required selector</h2> <form> <div> <label for="name">Name</label> <input type="text" name="name" id="name"/> </div> <div> <label for="email">Email</label> <input type="email" name="email" id="email" required /> </div> <div> <input type="submit" value="Submit" /> </div> </form> </body> </html> </code></pre> </div> <p><strong>输出：</strong> <br/><img alt="必需的" class="img-fluid" src="https://mangodoc.oss-cn-beijing.aliyuncs.com/geek8geeks/CSS_%7C_:required_Selector_0.jpg"/></p> <p><strong>支持的浏览器：</strong> :required Selector 支持的浏览器如下：</p> <ul> <li>苹果 Safari 5.0</li> <li>谷歌浏览器 10.0</li> <li>火狐 4.0</li> <li>歌剧 10.0</li> <li>浏览器 10.0 </li> </ul> <div class="_ap_apex_ad" id="82d2079a-8120-480f-9fc7-5cda825d56e7"></div> <p></p></div> </div> </div> </div> </div> </div> <footer> <div class="bg-white text-center pb-1"> <p class="text-body-tertiary pt-3 lh-lg text-opacity-50" id="footer-text">Copyright © 2020 - 2024 版权所有 <br> <a href="https://beian.miit.gov.cn/" target="_blank" class="text-opacity-50 text-body-tertiary mt-1 mb-1">蜀ICP备20006366号-1</a> <br> Made with ❤️ in Chengdu </p> </div> </footer>  <script src="https://unpkg.com/bootstrap@5.3.0-alpha1/dist/js/bootstrap.bundle.min.js" crossorigin="anonymous"></script>  <script src="https://cdn.jsdelivr.net/npm/@meilisearch/instant-meilisearch/dist/instant-meilisearch.umd.min.js"></script> <script src="https://cdn.jsdelivr.net/npm/instantsearch.js@4"></script> <script src="https://www.imangodoc.com/static/javascript/meili_custom.js"></script>  <script src="https://cdn.jsdelivr.net/npm/prismjs@1.29.0/components/prism-core.min.js"></script> <script src="https://cdn.jsdelivr.net/npm/prismjs@1.29.0/plugins/toolbar/prism-toolbar.min.js"></script> <script src="https://cdn.jsdelivr.net/npm/prismjs@1.29.0/plugins/autoloader/prism-autoloader.min.js"></script> <script src="https://cdn.jsdelivr.net/npm/prismjs@1.29.0/plugins/copy-to-clipboard/prism-copy-to-clipboard.min.js"></script> </body> </html>