如何在 angular 项目中使用下拉菜单 bootstrap

Question

我已经在我的 angular 项目中安装了 bootstrap 5 并且一切就绪，我在 app.module.routing 中导入了 NgModule，但是当我将代码用于下拉菜单，它什么也没给我。我正在使用 angular 11。有人可以帮我吗，这是我尝试用作示例的代码：

<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>

Answer 1

确保包含 popper.js，因为 Bootstrap 4 中弹出或下拉的所有内容都需要它。

下面是 angular.json 的相关部分应该是这样的：

"architect": {
 "build": {
  ...
  "options: {
   "styles": [
      "node_modules/bootstrap/dist/css/bootstrap.min.css",
      "src/styles.css"
    ],
    "scripts": [
      "node_modules/jquery/dist/jquery.min.js",
      "node_modules/popper.js/dist/umd/popper.min.js",
      "node_modules/bootstrap/dist/js/bootstrap.min.js"
    ],
    ...
    }
  }
  ...
 }

要安装 popper.js 使用此命令：

npm install popper.js --save

Answer 2

You can also add these lines to the end of the body balise of the HTML file
      <!-- Optional JavaScript -->
      <!-- jQuery first, then Popper.js, then Bootstrap JS -->
      <script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>
      <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js" integrity="sha384-UO2eT0CpHqdSJQ6hJty5KVphtPhzWj9WO1clHTMGa3JDZwrnQq4sF86dIHNDz0W1" crossorigin="anonymous"></script>
      <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js" integrity="sha384-JjSmVgyd0p3pXB1rRibZUAYoIIy6OrQ6VrjIEaFf/nJGzIxFDsf4x0xIM+B07jRM" crossorigin="anonymous"></script>

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