css - 导航栏不会变成汉堡包 - bootstrap/Flask

Question

我的导航栏在小屏幕尺寸下无法正确显示:https://www.paulahuevo.com/

我将 Bootstrap Material Design 与 Flask 结合使用，并为导航栏提供以下代码:

<!-- Navbar -->
    <nav class="navbar navbar-expand-lg navbar-dark purple">
        <div class='container'>
        <div class="collapse navbar-collapse" id="navbarNavDropdown">

            <ul class="navbar-nav">
            {% for href, id, caption in navigation_bar %}

                <li{% if id == active_page %} class="active"{% endif %}>

                <a class="nav-link" href="{{ href|e }}">{{ caption|e }}</a>
                </li>

            {% endfor %}
            </ul>
        </div>
        </div>
    </nav>

我从未使用过 bootstrap，我错过了什么？

Answer 1

您缺少一些导航栏组件。

例如，您缺少 li 上的 nav-item 类。

此外，您还需要导航栏切换器。

查看此模板作为工作示例:

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta.3/css/bootstrap.min.css" integrity="sha384-Zug+QiDoJOrZ5t4lssLdxGhVrurbmBWopoEl+M6BdEfwnCJZtKxi1KgxUyJq13dy" crossorigin="anonymous">


<nav class="navbar navbar-expand-lg navbar-light bg-light">
  <a class="navbar-brand" href="#">Navbar</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">
      <li class="nav-item active">
        <a class="nav-link" href="#">Home <span class="sr-only">(current)</span></a>
      </li>
      <li class="nav-item">
        <a class="nav-link" href="#">Link</a>
      </li>
      <li class="nav-item dropdown">
        <a class="nav-link dropdown-toggle" href="#" id="navbarDropdown" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
          Dropdown
        </a>
        <div class="dropdown-menu" aria-labelledby="navbarDropdown">
          <a class="dropdown-item" href="#">Action</a>
          <a class="dropdown-item" href="#">Another action</a>
          <div class="dropdown-divider"></div>
          <a class="dropdown-item" href="#">Something else here</a>
        </div>
      </li>
      <li class="nav-item">
        <a class="nav-link disabled" href="#">Disabled</a>
      </li>
    </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>
  </div>
</nav>


<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"></script>
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