为什么我的 Bootstrap 5 下拉菜单不起作用？答案

【问题标题】：Why isn't my Bootstrap 5 dropdown menu working?为什么我的 Bootstrap 5 下拉菜单不起作用？
【发布时间】：2022-01-30 09:05:50
【问题描述】：

最近，我开始了 web 开发，我正在使用 bootstrap v5.0 来构建一个网站。以下是名为“grage.php”的文件的代码，其代码如下，

<!-- HERE SHOULD BE THE CODE OF GARAGE    -->
<div class="container-fluid">
    <div class="row">
        <!-- CODE FOR OPTIONS-->
        <div class="col-3" style="align-items: center;">
            <div class="dropdown">
                <button class="btn btn-secondary dropdown-toggle" type="button" id="dropdownMenuButton1" data-bs-toggle="dropdown" aria-expanded="false">
                    Dropdown button
                </button>
                <ul class="dropdown-menu" aria-labelledby="dropdownMenuButton1">
                    <li><a class="dropdown-item" href="#">Action</a></li>
                    <li><a class="dropdown-item" href="#">Another action</a></li>
                    <li><a class="dropdown-item" href="#">Something else here</a></li>
                </ul>
            </div>
        </div>
        <!-- CODE FOR DISPLAYING MODEL -->
        <div class="col-7">
            <div style="align-items: center;">
                <model-viewer src="car_models/compressed_civic.glb" alt="A 3D model of an astronaut" ar ar-modes="webxr scene-viewer quick-look" environment-image="neutral" auto-rotate camera-controls>
                </model-viewer>
            </div>
        </div>
        <!-- CODE FOR DISPLAYING CHOOSED OPTION'S AND ETC-->
        <div class="col-2">
            <p>Here should be the code for option's</p>
        </div>
    </div>
</div>
<!-- ADDING FOOTER   -->
<?php
include "headerAndFooter/footer.php";
?>
<script type="module" src="https://unpkg.com/@google/model-viewer/dist/model-viewer.min.js"></script>
<script nomodule src="https://unpkg.com/@google/model-viewer/dist/model-viewer-legacy.js"></script> -->
<script src="https://code.jquery.com/jquery-3.5.1.slim.min.js" integrity="sha384-DfXdz2htPH0lsSSs5nCTpuj/zy4C+OGpamoFVy38MVBnE+IbbVYUew+OrCXaRkfj" crossorigin="anonymous"></script>
<script src="https://cdn.jsdelivr.net/npm/bootstrap@4.6.0/dist/js/bootstrap.bundle.min.js" integrity="sha384-Piv4xVNRyMGpqkS2by6br4gNJ7DXjqk09RmUpJ8jgGtD7zP9yug3goQfGII0yAns" crossorigin="anonymous"></script>

我遇到了问题，因为下拉功能不起作用，如下所示，Dropdown Image

注意：我在标题中添加了引导 css CDN 链接。

请告诉我，如何解决这个问题。

【问题讨论】：

标签： html css bootstrap-4 bootstrap-5

【解决方案1】：

我正在使用引导程序 v5.0

但是您已经加载了 bootstrap 4。这就是它无法正常工作的原因。 Bootstrap 4 使用 data-toggle="dropdown"，而 bootstrap 5 使用 data-bs-toggle="dropdown"。所以请使用正确的 JavaScript/CSS。

引导程序 4 示例：

<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@4.6.1/dist/css/bootstrap.min.css" integrity="sha384-zCbKRCUGaJDkqS1kPbPd7TveP5iyJE0EjAuZQTgFLD2ylzuqKfdKlfG/eSrtxUkn" crossorigin="anonymous">

<div class="dropdown">
  <button class="btn btn-secondary dropdown-toggle" type="button" id="dropdownMenuButton1" data-toggle="dropdown" aria-expanded="false">
            Dropdown button
        </button>
  <ul class="dropdown-menu" aria-labelledby="dropdownMenuButton1">
    <li><a class="dropdown-item" href="#">Action</a></li>
    <li><a class="dropdown-item" href="#">Another action</a></li>
    <li><a class="dropdown-item" href="#">Something else here</a></li>
  </ul>
</div>

<script src="https://cdn.jsdelivr.net/npm/jquery@3.5.1/dist/jquery.slim.min.js" integrity="sha384-DfXdz2htPH0lsSSs5nCTpuj/zy4C+OGpamoFVy38MVBnE+IbbVYUew+OrCXaRkfj" crossorigin="anonymous"></script>
<script src="https://cdn.jsdelivr.net/npm/bootstrap@4.6.1/dist/js/bootstrap.bundle.min.js" integrity="sha384-fQybjgWLrvvRgtW6bFlB7jaZrFsaBXjsOMm/tB9LTS58ONXgqbR9W8oWht/amnpF" crossorigin="anonymous"></script>

引导程序 5 示例：

<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.1.3/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-1BmE4kWBq78iYhFldvKuhfTAU6auU8tT94WrHftjDbrCEXSU1oBoqyl2QvZ6jIW3" crossorigin="anonymous">

<div class="dropdown">
  <button class="btn btn-secondary dropdown-toggle" type="button" id="dropdownMenuButton1" data-bs-toggle="dropdown" aria-expanded="false">
            Dropdown button
        </button>
  <ul class="dropdown-menu" aria-labelledby="dropdownMenuButton1">
    <li><a class="dropdown-item" href="#">Action</a></li>
    <li><a class="dropdown-item" href="#">Another action</a></li>
    <li><a class="dropdown-item" href="#">Something else here</a></li>
  </ul>
</div>

<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.1.3/dist/js/bootstrap.bundle.min.js" integrity="sha384-ka7Sk0Gln4gmtz2MlQnikT1wXgYsOg+OMhuP+IlRH9sENBO0LRn5q+8nbTov4+1p" crossorigin="anonymous"></script>

【讨论】：