Bootstrap 导航栏不会切换

Question

您好，我无法弄清楚为什么我的导航栏菜单在导航栏折叠时没有打开。我正在使用 Angular 4 (cli)、Bootstrap 4.0.0-beta 和 sass。如果这很重要，我也在使用 ngx-bootstrap

html

<nav class="navbar navbar-expand-lg navbar-dark bg-dark fixed-top navbar-toggleable-md">
  <div class="container">
    <a class="navbar-brand" href="#">Test</a>
    <button class="navbar-toggler" type="button" data-toggle="collapse" data-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 ml-auto">
        <li class="nav-item">
          <a class="nav-link" [routerLink]="['/view']">View
            <span class="sr-only">(current)</span>
          </a>
        </li>
        <li class="nav-item">
          <a class="nav-link"[routerLink]="['/upload']">Upload</a>
        </li>
        <li class="nav-item dropdown" dropdown>
          <a dropdownToggle  class="nav-link dropdown-toggle">
            Print
          </a>
          <ul *dropdownMenu class="dropdown-menu" role="menu">
            <li role="menuitem"><a class="dropdown-item" (click)="onPrint(1)">Landscape</a></li>
            <li role="menuitem"><a class="dropdown-item" (click)="onPrint()">Portrait</a></li>
          </ul>
        </li>

      </ul>
    </div>
  </div>
</nav>

angular-cli.json

  "styles": [
    "../node_modules/bootstrap/dist/css/bootstrap.css",
    "styles.scss"
  ],
  "scripts": [
  ],

styles.scss

@import 'variables';
@import '../node_modules/bootstrap/scss/bootstrap';
@import '../node_modules/font-awesome/scss/font-awesome';

我还创建了一个 plunkr

http://embed.plnkr.co/2CYpsoQAQEOPljR17Pjq/

Answer 1

您需要在页面中包含 JavaScript 文件：

<script src="https://code.jquery.com/jquery-3.1.1.slim.min.js" integrity="sha384-A7FZj7v+d/sdmMqp/nOQwliLvUsJfDHW+k9Omg/a/EheAdgtzNs3hpfag6Ed950n" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/tether/1.4.0/js/tether.min.js" integrity="sha384-DztdAPBWPRXSA/3eYEEUWrWCy7G5KFbe8fFjk5JAIxUYHKkDx6Qin1DkWx51bBrb" crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/js/bootstrap.min.js" integrity="sha384-vBWWzlZJ8ea9aCX4pEW3rVHjgjt7zpkNpZk+02D9phzyeVkE+jo0ieGizqPLForn" crossorigin="anonymous"></script>

在他们的“入门”页面上，它会告诉您要包​​含哪些文件：

https://v4-alpha.getbootstrap.com/