jQuery change()

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📜 jQuery change()

📅 最后修改于: 2020-11-26 07:00:22 🧑 作者: Mango

更改元素的值时，将发生jQuery change事件。它仅适用于表单字段。当发生change事件时，change()方法将附加一个函数来运行。

注意：此事件仅限于元素，框和<select>元素。</ html></p> <ul> <li><strong>对于选择框，复选框和单选按钮</strong>：当用户使用鼠标进行选择时，将立即触发该事件。</li> <li><strong>对于其他元素类型</strong>：当字段失去焦点时发生该事件。</li> </ul> <p>句法：</p> <div class="hcb_wrap"> <pre class="prism line-numbers lang-python" data-lang="Java"><code><span <="" span="" style="font-size: 10pt">$(selector).change() </span></code></pre> </div> <p>它触发选定元素的更改事件。</p> <div class="hcb_wrap"> <pre class="prism line-numbers lang-python" data-lang="Java"><code><span <="" span="" style="font-size: 10pt">$(selector).change(function) </span></code></pre> </div> <p>它将一个函数添加到更改事件。</p> <h4>jQuery change()事件的参数</h4> <table style="width: 100%; border-collapse: collapse; border-color: #b0b7d6; border-style: dotted; background-color: #f2eded;"> <tbody> <tr> <th>Parameter</th> <th>Description</th> </tr> <tr> <td>Function</td> <td>It is an optional parameter. It is used to specify the function to run when the change event occurs for the selected elements. </td> </tr> </tbody> </table> <h4>jQuery change()事件的示例</h4> <p>让我们以一个示例来演示jQuery change()事件。</p> <div class="hcb_wrap"> <pre class="prism line-numbers lang-python" data-lang="Java"><code><span <="" span="" style="font-size: 10pt"><!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <title>change demo</title> <style> div { color: red; } </style> <script src="https://code.jquery.com/jquery-1.10.2.js"></script> </head> <body> <select id="se" name="actors" > <option>Uthappa</option> <option selected="selected">Kattapa</option> <option>Veerappa</option> <option>Bahubali</option> <option>Bhallal Dev</option> <option>Awantika</option> </select> <div id="loc"></div> <script> $( "select" ) .change(function () { document.getElementById("loc").innerHTML="You selected: "+document.getElementById("se").value; }); </script> </body> </html> </span></code></pre> </div> <p>输出：</p> <p>让我们看一下jQuery change事件的另一个示例，其中我们提供使用ctrl键选择多个数据的选项。</p> <div class="hcb_wrap"> <pre class="prism line-numbers lang-python" data-lang="Java"><code><span <="" span="" style="font-size: 10pt"><!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <title>change demo</title> <style> div { color: red; } </style> <script src="https://code.jquery.com/jquery-1.10.2.js"></script> </head> <body> <select name="Employees" multiple="multiple"> <option>Uthappa</option> <option selected="selected">Kattapa</option> <option>Veerappa</option> <option selected="selected">Bahubali</option> <option>Bhallal Dev</option> <option>Awantika</option> </select> <div></div> <script> $( "select" ) .change(function () { var str = ""; $( "select option:selected" ).each(function() { str += $( this ).text() + " "; }); $( "div" ).text( str ); }) .change(); </script> </body> </html> </span></code></pre> </div> <p>输出：</p> </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>