Question

我正在使用 Bootstrap 4 开发一个网站。当网站在移动设备上时，导航栏不再显示链接，而是显示三个水平栏。如果单击它们，导航栏应该会扩展，但不会扩展。我只是从Bootstrap introduction复制了Starter模板并添加了导航栏。我想念什么？

calculateArea()

Answer 1

您需要将id navbarSupportedContent设置为div，如何设置类navbar-collapse：

<div class="collapse navbar-collapse" id="navbarSupportedContent">

此ID在属性data-target中的按钮中设置：

<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
            <span class="navbar-toggler-icon"></span>
        </button>

    <!-- Bootstrap CSS -->
    <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css" integrity="sha384-MCw98/SFnGE8fJT3GXwEOngsV7Zt27NXFoaoApmYm81iuXoPkFOJwJ8ERdknLPMO" crossorigin="anonymous">

    <!-- Font for glyphicons -->
    <link href="https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css" rel="stylesheet">

    <!-- Own CSS styles -->
    <link rel="stylesheet" type="text/css" href="styles.css">
   
    <nav class="navbar navbar-dark bg-dark navbar-expand-lg">
        <a class="navbar-brand" href="#">Title</a>
        <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
            <span class="navbar-toggler-icon"></span>
        </button>

        <div class="collapse navbar-collapse" id="navbarSupportedContent">
            <ul class="navbar-nav mr-auto">

            </ul>
            <form class="form-inline my-2 my-lg-0">
                <input class="form-control mr-sm-2" type="search" placeholder="Search" aria-label="Search">
                <button class="btn btn-outline-success my-2 my-sm-0" type="submit">Search</button>
            </form>
            <ul class="navbar-nav ml-auto">
                <li class="nav-item">
                    <a class="nav-link" href="#"><i class="fa fa-user-o" aria-hidden="true"></i></a>
                </li>
            </ul>
        </div>
    </nav>

    <div class="container">
        <h1>Content</h1>
    </div>

    <footer class="footer">
        <div class="container">
            <span class="text-muted">Title, 2018</span>
        </div>
    </footer>

    <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/1.14.3/umd/popper.min.js" integrity="sha384-ZMP7rVo3mIykV+2+9J3UJ46jBk0WLaUAdn689aCwoqbBJiSnjAK/l8WvCWPIPm49" crossorigin="anonymous"></script>
    <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/js/bootstrap.min.js" integrity="sha384-ChfqqxuZUCnJSK3+MXmPNIyE6ZbWh2IMqE241rYiqJxyMiZ6OW/JmZQ5stwEULTy" crossorigin="anonymous"></script>

Bootstrap 4导航栏不会折叠

1 个答案: