Bootstrap 5 下拉菜单失效

Question

作为 Bootstrap 的相对新手，我一直在尝试编写带有下拉菜单的菜单。代码如下，但我发现了一些问题：

菜单代码是从 GetBootstrap.com 文档中复制的。查看其他站点以查看问题可能出在哪里，尝试了替代方法但没有成功。
bootstrap.min.css 和 bootstrap.bundle.min.js，均为版本 5，已链接到代码中。直接在网站上和通过链接尝试了这些文件。还尝试了 popper.js 加上 bootstrap.min.js；同样的结果。
直接链接有效，但下拉部分无效。单击下拉项不会产生任何结果。如果它能在悬停时显示并留在原地以便可以单击子项，那就太好了。
菜单应该在屏幕的右侧；查看答案，ms-auto 应该这样做。它没有。
当屏幕折叠成平板电脑或 phone 大小时，菜单会转到预期的压缩符号，但根本不起作用；单击时不会显示任何内容。

  <nav class="navbar navbar-expand-lg navbar-light" style="background-color: #e6e6e6;">
    <div class="container-fluid">
    <a class="navbar-brand" href="#">
           <img src="img/text835.png" width="160" height="48" alt="">
      </a>
      <button class="navbar-toggler" type="button" data-bs-toggle="collapse"
        data-bs-target="#navbarResponsive" aria-controls="navbarResponsive"
        aria-expanded="false" aria-label="Toggle navigation">
        <span class="navbar-toggler-icon"></span>
      </button>
      <div class="collapse navbar-collapse" id="navbarResponsive">
        <ul class="navbar-nav ms-auto">
          <li class="nav-item active">
            <a class="nav-link" href="#">Home</a>
          </li>
          <li class="nav-item" dropdown>
            <a class="nav-link dropdown-toggle" href="#"
                id="navbarConsultants" role="button" data-bs-toggle="dropdown" 
                aria-expanded="false">Consultants</a>
                <ul class="dropdown-menu" aria-labelledby="navbarConsultants">
                <li><a class="dropdown-item" href="#">Consultants</a></li>
                    <div class="dropdown-divider"></div>
                    <li><a class="dropdown-item" href="#">Andy</a></li>
                    <li><a class="dropdown-item" href="#">Bill</a></li>
                </ul>
          </li>
          <li class="nav-item">
            <a class="nav-link" href="#">Contact Us</a>
          </li>
        </ul>
      </div>
    </div>
  </nav>

Answer 1

dropdown 应该是 class .. 不是属性：

<nav class="navbar navbar-expand-lg navbar-light" style="background-color: #e6e6e6;">
    <div class="container-fluid">
    <a class="navbar-brand" href="#">
           <img src="//via.placeholder.com/160x48" width="160" height="48" alt="">
      </a>
      <button class="navbar-toggler" type="button" data-bs-toggle="collapse"
        data-bs-target="#navbarResponsive" aria-controls="navbarResponsive"
        aria-expanded="false" aria-label="Toggle navigation">
        <span class="navbar-toggler-icon"></span>
      </button>
      <div class="collapse navbar-collapse" id="navbarResponsive">
        <ul class="navbar-nav ms-auto">
          <li class="nav-item active">
            <a class="nav-link" href="#">Home</a>
          </li>
          <li class="nav-item dropdown">
            <a class="nav-link dropdown-toggle" href="#"
                id="navbarConsultants" role="button" data-bs-toggle="dropdown" 
                aria-expanded="false">Consultants</a>
                <ul class="dropdown-menu" aria-labelledby="navbarConsultants">
                <li><a class="dropdown-item" href="#">Consultants</a></li>
                    <div class="dropdown-divider"></div>
                    <li><a class="dropdown-item" href="#">Andy</a></li>
                    <li><a class="dropdown-item" href="#">Bill</a></li>
                </ul>
          </li>
          <li class="nav-item">
            <a class="nav-link" href="#">Contact Us</a>
          </li>
        </ul>
      </div>
    </div>
  </nav>

Everything works as expected

Answer 2

使用CDN整合Bootstrap 5.0.0-beta3资源，下面应该可以。

<!doctype html>
<html lang="en">
  <head>
    <!-- Required meta tags -->
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">

    <!-- Bootstrap CSS -->
    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.0.0-beta3/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-eOJMYsd53ii+scO/bJGFsiCZc+5NDVN2yr8+0RDqr0Ql0h+rP48ckxlpbzKgwra6" crossorigin="anonymous">

    <title>Custom Navbar with <strong>Bootstrap 5.0.0-beta3</strong></title>
  </head>
  <body>

    <!-- Optional JavaScript; choose one of the two! -->

    <!-- Option 1: Bootstrap Bundle with Popper -->
    <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.0.0-beta3/dist/js/bootstrap.bundle.min.js" integrity="sha384-JEW9xMcG8R+pH31jmWH6WWP0WintQrMb4s7ZOdauHnUtxwoG2vI5DkLtS3qm9Ekf" crossorigin="anonymous"></script>

    <!-- Option 2: Separate Popper and Bootstrap JS -->
    <!--
    <script src="https://cdn.jsdelivr.net/npm/@popperjs/core@2.9.1/dist/umd/popper.min.js" integrity="sha384-SR1sx49pcuLnqZUnnPwx6FCym0wLsk5JZuNx2bPPENzswTNFaQU1RDvt3wT4gWFG" crossorigin="anonymous"></script>
    <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.0.0-beta3/dist/js/bootstrap.min.js" integrity="sha384-j0CNLUeiqtyaRmlzUHCPZ+Gy5fQu0dQ6eZ/xAww941Ai1SxSY+0EQqNXNE6DZiVc" crossorigin="anonymous"></script>
    -->

<div class="container">
<nav class="navbar navbar-expand-lg navbar-light" style="background-color: #e6e6e6;">
    <div class="container-fluid">
    <a class="navbar-brand" href="#">
           <img src="img/text835.png" width="160" height="48" alt="">
      </a>
      <button class="navbar-toggler" type="button" data-bs-toggle="collapse"
        data-bs-target="#navbarResponsive" aria-controls="navbarResponsive"
        aria-expanded="false" aria-label="Toggle navigation">
        <span class="navbar-toggler-icon"></span>
      </button>
      <div class="collapse navbar-collapse" id="navbarResponsive">
        <ul class="navbar-nav ms-auto">
          <li class="nav-item active">
            <a class="nav-link" href="#">Home</a>
          </li>
          <li class="nav-item dropdown">
            <a class="nav-link dropdown-toggle" href="#"
                id="navbarConsultants" role="button" data-bs-toggle="dropdown" 
                aria-expanded="false">Consultants</a>
                <ul class="dropdown-menu" aria-labelledby="navbarConsultants">
                <li><a class="dropdown-item" href="#">Consultants</a></li>
                    <div class="dropdown-divider"></div>
                    <li><a class="dropdown-item" href="#">Andy</a></li>
                    <li><a class="dropdown-item" href="#">Bill</a></li>
                </ul>
          </li>
          <li class="nav-item">
            <a class="nav-link" href="#">Contact Us</a>
          </li>
        </ul>
      </div>
    </div>
  </nav>
</div>

  </body>
</html>

希望对您有所帮助！

随时为答案点赞

Answer 3

感谢 Manifest Man 和 Zim。我使用的是早期版本的 bootstrap 5，当使用最新版本的 bootstrap.min.css 和 bootstrap.bundle.min.js 时，它开始工作了。

此外，是的，下拉列表是一个 class，而不是一个属性。

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