html - Bootstrap 4 下拉触发错误的元素

Question

我正在开发一个导航栏，其中有 2 个元素有下拉菜单。第一个下拉列表工作正常，但第二个总是触发第一个。我在删除我添加的所有额外样式后对其进行了测试，但它仍然无法正常工作。

我确定这是显而易见的事情，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

在我的例子中，问题是我没有将整个下拉列表(包括触发元素和菜单项)包装在 <div class="dropdown"> 中。 .它仍然有效，直到我添加了第二个下拉菜单并发现它是由错误的元素触发的。

Bootstrap 4 下拉菜单应具有以下基本结构:

<div class="dropdown">
    <a href="#" data-toggle="dropdown">Triggering Element</a>
    <div class="dropdown-menu">
        <a href="#" class="dropdown-item">Item One</a>
        <a href="#" class="dropdown-item">Item Two</a>
        <a href="#" class="dropdown-item">Item Three</a>
    </div>

</div>

我缺少外层 <div> .