在 jQuery 中修改输入字段时如何附加文本消息？

在本文中，我们将看到如何在 jQuery 中更改输入字段时向元素附加文本消息。要在输入字段更改时附加带有文本消息的元素，请使用 change() 和 appendTo() 方法。 change() 方法用于检测输入字段值的变化。此方法仅适用于“、和 <select>”元素。 appendTo() 方法用于追加元素。</p><p><strong>句法：</strong> </p><div class="hcb_wrap"><pre class="prism undefined-numbers lang-js" data-lang="JavaScript"><code class="replace">$($selector).change(function() { })</code></pre></div><p>在这里，首先我们使用 change() 方法来检测输入字段的变化，并使用 appendTo() 方法来显示消息。</p><p><strong>例子：</strong></p><div><h5 class="code">HTML</h5><div class="hcb_wrap"><pre class="prism undefined-numbers lang-html" data-lang="HTML"><code class="replace"><!DOCTYPE html> <html> <head> <title> How to append an element with a text message when an input field is changed in jQuery? </title> <script src= "https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"> </script> <script> $(document).ready(function () { $("#textInput").change(function () { $("<p>Input text has changed.</p>") .appendTo("body"); }); }); </script> <style> body { text-align: center; } h1 { color: green; } .clickable_ele { font-size: 20px; font-weight: bold; } </style> </head> <body> <h1>GeeksforGeeks</h1> <h3> How to append an element with a text message <br>when an input field is changed in jQuery? </h3> <form action="#"> <input id="textInput" type="text" value="GeeksforGeeks"> </form> </body> </html></code></pre></div><br><hr></div><p><strong>输出：</strong> </p><p><img src="https://mangodoc.oss-cn-beijing.aliyuncs.com/geek8geeks/How_to_append_an_text_message_when_an_input_field_is_modified_in_jQuery_?_0.jpg" width="700"></p><div style="min-height:280px" id="82d2079a-8120-480f-9fc7-5cda825d56e7" class="_ap_apex_ad"></div><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://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>