AngularJS | ng-keydown 指令

AngluarJS 中的ng-keydown 指令用于在 keydown 事件上应用自定义行为。、元素支持它。</p><p><strong>句法：</strong> </p><div class="hcb_wrap"><pre class="prism undefined-numbers lang-java" data-lang="java"><code class="replace"><element ng-keydown="expression"> Contents... </element></code></pre></div><p><strong>示例：</strong>本示例使用 ng-keydown 指令来更改按下按钮后的背景颜色。 </p><div class="hcb_wrap"><pre class="prism undefined-numbers lang-java" data-lang="java"><code class="replace"><!DOCTYPE html> <html> <head> <title>ng-keydown Directive</title> <script src= "https://ajax.googleapis.com/ajax/libs/angularjs/1.6.9/angular.min.js"> </script> <style type="text/css"> .keyDown { background-color: green; color: white; } .keyUp { background-color: white; } </style> </head> <body ng-app style="text-align:center"> <h1 style="color:green"> GeeksforGeeks </h1> <h2>ng-keydown Directive</h2> <div> <b>Enter Name: </b><input type="text" ng-model="searchValue" ng-keydown="keyDown=true" ng-keyup="keyDown=false" ng-class= "{true:'keyDown', false:'keyUp'}[keyDown]" /> <br> </div> </body> </html> </code></pre></div><p><strong>输出：</strong><br><strong>按下按钮之前：</strong> <br><img src="https://mangodoc.oss-cn-beijing.aliyuncs.com/geek8geeks/AngularJS_%7C_ng-keydown_Directive_0.png" alt="ngkeydown" class="aligncenter"><br><strong>按下按钮后：</strong> <br><img src="https://mangodoc.oss-cn-beijing.aliyuncs.com/geek8geeks/AngularJS_%7C_ng-keydown_Directive_1.png" alt="ngkeydown" class="aligncenter"></p><br></div></article> </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>