Bootstrap 4下拉触发错误的项目

Question

我正在使用导航栏，其中2个项目有下拉菜单。第一个下拉列表工作正常，但第二个下拉列表总是触发第一个下拉列表。我删除了我添加的任何额外的样式后测试了它但它仍然无法正常工作。

我确信这是明显的，但我似乎无法弄明白。

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css">
<script src="https://code.jquery.com/jquery-3.1.0.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js"></script>
<link href="css/app.css" rel="stylesheet" />

<!--  NAVIGATION BAR  -->
        <nav class="navbar navbar-expand-lg navbar-dark bg-dark">
            <div class="container-fluid">
                <button class="navbar-toggler navbar-toggler-right" type="button" data-toggle="collapse" data-target="#navbarCollapsing" aria-controls="navbarCollapsing" aria-expanded="false" aria-label="Toggle navigation">
                    <span class="navbar-toggler-icon"></span>
                </button>
                <h1 class="navbar-brand mb-0">
                    <img class="pigs-logo" src="assets/logo.png">
                </h1>
                <div class="collapse navbar-collapse" id="navbarCollapsing">
                    <div class="nav navbar-nav">
                        <a class="nav-item nav-link active" href="./index.html">
                            Home
                        </a>
                        <a class="nav-item nav-link" href="./tour.html">
                            Tour
                        </a>
                        <a class="nav-item nav-link dropdown-toggle" href="#" id="navbar-media" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
                            Media
                        </a>
                        <div class="dropdown">
                            <div class="dropdown-menu dropdown-menu-right" aria-labelledby="navbar-media">
                                <a class="dropdown-item" href="./videos.html">
                                    Videos
                                </a>
                                <a class="dropdown-item" href="./photos.html">
                                    Photos
                                </a>
                                <a class="dropdown-item" href="./audio.html">
                                    Audio
                                </a>
                            </div>
                        </div>
                        <a class="nav-item nav-link" href="./about.html">
                            About
                        </a>
                        <a class="nav-item nav-link dropdown-toggle" href="#" id="navbar-contact" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
                            Contact
                        </a>
                        <div class="dropdown">
                            <div class="dropdown-menu dropdown-menu-right" aria-labelledby="navbar-contact">
                                <a class="dropdown-item" href="./contact.html">
                                    Contact
                                </a>
                                <a class="dropdown-item" href="./booking.html">
                                    Booking
                                </a>
                            </div>
                        </div>
                    </div>
                </div>
            </div>
        </nav>

Answer 1

请在导航栏中使用<li class="nav-item"><li>而不是使用直接a标签。如下代码。

<li class="nav-item">
  <a class="nav-link" href="#">Link</a>
</li>

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js"></script>
<!--  NAVIGATION BAR  -->
       

<nav class="navbar navbar-expand-lg navbar-dark bg-dark">
  <div class="container-fluid">
    <button class="navbar-toggler navbar-toggler-right" type="button" data-toggle="collapse" data-target="#navbarCollapsing" aria-controls="navbarCollapsing" aria-expanded="false" aria-label="Toggle navigation">
    <span class="navbar-toggler-icon"></span>
    </button>
    <h1 class="navbar-brand mb-0">
      <img class="pigs-logo" src="assets/logo.png">
    </h1>
    <div class="collapse navbar-collapse" id="navbarCollapsing">
      <div class="nav navbar-nav">
        <li class="nav-item">
          <a class="nav-link active" href="./index.html">
          Home
          </a>
        <li>
        <li class="nav-item">
          <a class="nav-link" href="./tour.html">
          Tour
          </a>
        </li>
        <li class="nav-item">
          <a class="nav-link dropdown-toggle" href="#" id="navbar-media" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
          Media
          </a>
          <div class="dropdown">
            <div class="dropdown-menu dropdown-menu-right" aria-labelledby="navbar-media">
              <a class="dropdown-item" href="./videos.html">
              Videos
              </a>
              <a class="dropdown-item" href="./photos.html">
              Photos
              </a>
              <a class="dropdown-item" href="./audio.html">
              Audio
              </a>
            </div>
          </div>
        </li>
        <li class="nav-item">
          <a class="nav-link" href="./about.html">
          About
          </a>
        </li>
        <li class="nav-item">
          <a class="nav-item nav-link dropdown-toggle" href="#" id="navbar-contact" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
          Contact
          </a>
          <div class="dropdown">
            <div class="dropdown-menu dropdown-menu-right" aria-labelledby="navbar-contact">
              <a class="dropdown-item" href="./contact.html">
              Contact
              </a>
              <a class="dropdown-item" href="./booking.html">
              Booking
              </a>
            </div>
          </div>
        </li>
      </div>
    </div>
  </div>
</nav>

Answer 2

关于导航栏中下拉列表的a标签的另一个答案的建议是错误的。

您当然可以使用纯粹的a标签，就像您使用它们一样没有任何问题。

只有当涉及到多个下拉项时，如果有多个下拉列表，则需要将它们包含在类btn-group的div中，如下面的代码片段所示。 （严格来说，第一个下拉列表不需要以这种方式包装，但为了保持一致性，我仍然这样做了）

点击下面的“运行代码段”并展开到完整页面进行实时测试：

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" 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>

<nav class="navbar navbar-expand-lg navbar-dark bg-dark">
    <div class="container-fluid">
        <button class="navbar-toggler navbar-toggler-right" type="button" data-toggle="collapse" data-target="#navbarCollapsing" aria-controls="navbarCollapsing" aria-expanded="false" aria-label="Toggle navigation">
            <span class="navbar-toggler-icon"></span>
        </button>
        <h1 class="navbar-brand mb-0">
            <img class="pigs-logo" src="https://placehold.it/30">
        </h1>
        <div class="collapse navbar-collapse" id="navbarCollapsing">
            <div class="nav navbar-nav">
                <a class="nav-item nav-link active" href="./index.html">
                    Home
                </a>
                <a class="nav-item nav-link" href="./tour.html">
                    Tour
                </a>
                <div class="btn-group">
                    <a class="nav-item nav-link dropdown-toggle" href="#" id="navbar-media" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
                        Media
                    </a>
                    <div class="dropdown">
                        <div class="dropdown-menu dropdown-menu-right" aria-labelledby="navbar-media">
                            <a class="dropdown-item" href="./videos.html">
                                Videos
                            </a>
                            <a class="dropdown-item" href="./photos.html">
                                Photos
                            </a>
                            <a class="dropdown-item" href="./audio.html">
                                Audio
                            </a>
                        </div>
                    </div>
                </div>
                <a class="nav-item nav-link" href="./about.html">
                    About
                </a>
                <div class="btn-group">
                    <a class="nav-item nav-link dropdown-toggle" href="#" id="navbar-contact" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
                        Contact
                    </a>
                    <div class="dropdown">
                        <div class="dropdown-menu dropdown-menu-right" aria-labelledby="navbar-contact">
                            <a class="dropdown-item" href="./contact.html">
                                Contact
                            </a>
                            <a class="dropdown-item" href="./booking.html">
                                Booking
                            </a>
                        </div>
                    </div>
                </div>
            </div>
        </div>
    </div>
</nav>