如何使用 Bootstrap 创建下拉菜单？

Question

我在 'Menubar' 创建了一个下拉菜单。我正在使用 Bootstrap 5.1 来做到这一点。这是一个 'ASP.NET Core 6 MVC' 项目。也是片面的看法。具体代码如下：

<li class="nav-item dropdown show">
  <a class="dropdown-toggle nav-link text-dark" href="#" data-toggle="dropdown">Admin</a>
  <div class="dropdown-menu">
    <a class="dropdown-item">Categories</a>
    <a class="dropdown-item">Media Types</a>
  </div>
</li>

但是每当我点击这个 link 时，下拉菜单不会切换。如果有人可以指出将非常有帮助的问题。附上参考视频here

Answer 1

这里有错字：

之前

<a class="dropdown-item">>Categories</a>

之后

<a class="dropdown-item">Categories</a>

更新

添加到您的错字中，例如 @seantsang94121 said the other problem here is that you are using this code in bootstrap 5 and it only works in bootstrap 4 as his example shown on his answer ->

Answer 2

你需要那些：

<head>
    <link
      href="https://cdn.jsdelivr.net/npm/bootstrap@5.0.2/dist/css/bootstrap.min.css"
      rel="stylesheet"
      integrity="sha384-EVSTQN3/azprG1Anm3QDgpJLIm9Nao0Yz1ztcQTwFspd3yD65VohhpuuCOmLASjC"
      crossorigin="anonymous"
    />

    <script
      src="https://code.jquery.com/jquery-3.2.1.slim.min.js"
      integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN"
      crossorigin="anonymous"
    ></script>
    <script
      src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js"
      integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q"
      crossorigin="anonymous"
    ></script>
    <script
      src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js"
      integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl"
      crossorigin="anonymous"
    ></script>
  </head>

Answer 3

以上答案全部错误。我看过你的视频，原因是你的代码使用 bootstrap-4，而不是 bootstrap-5。

我已经使用 bootstrap-4 入门模板测试了您的代码，现在可以使用了。

<!doctype html>
<html lang="en">
  <head>
    <!-- Required meta tags -->
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">

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

    <title>Hello, world!</title>
  </head>
  <body>
    <li class="nav-item dropdown show">
      <a class="dropdown-toggle nav-link text-dark" href="#" data-toggle="dropdown">Admin</a>
      <div class="dropdown-menu">
        <a class="dropdown-item">Categories</a>
        <a class="dropdown-item">Media Types</a>
      </div>
    </li>

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

    <!-- Option 1: jQuery and Bootstrap Bundle (includes Popper) -->
    <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>

    <!-- Option 2: Separate Popper and Bootstrap JS -->
    <!--
    <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/popper.js@1.16.1/dist/umd/popper.min.js" integrity="sha384-9/reFTGAW83EW2RDu2S0VKaIzap3H66lZH81PoYlFhbGU+6BZp6G7niu735Sk7lN" crossorigin="anonymous"></script>
    <script src="https://cdn.jsdelivr.net/npm/bootstrap@4.6.1/dist/js/bootstrap.min.js" integrity="sha384-VHvPCCyXqtD5DqJeNxl2dtTyhF78xXNXdkwX1CZeRusQfRKp+tA7hAShOK/B/fQ2" crossorigin="anonymous"></script>
    -->
  </body>
</html>

通过here检查入门模板。

如果您确定整个 ASP.NET Core MVC Bootstrap 的版本是 5.1，您的代码将无法运行。

如何使用 Bootstrap 创建下拉菜单？

How to create a dropdown using Bootstrap?

html

css

frontend

asp.net-core

bootstrap-5