Bootstrap导航栏无法正确渲染

时间:2018-01-28 19:15:13

标签: html css twitter-bootstrap

我通过youtube tutorial学习Flask,但我无法让bootstrap导航栏正常工作。我从bootstrap示例部分中获取了代码。我已经尝试了类似问题的其他答案,但似乎没有解决问题。代码段和截图发布在下面。我使用的CSS链接也很好用。我是初学者,所以任何帮助都会非常感激。谢谢。

enter image description here

的layout.html:

<!DOCTYPE html>
<html>
<head>
  <title>MyFlaskApp</title>
  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css">

</head>
<body>

  {% include 'includes/_navbar.html' %}
  {% block body %}{% endblock %}
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js"></script>


</body>
</html>

_navbar.html:

 <nav class="navbar navbar-default">
  <div class="container">
    <div class="navbar-header">
      <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#navbar" aria-expanded="false" aria-controls="navbar">
        <span class="sr-only">Toggle navigation</span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
      </button>
      <a class="navbar-brand" href="#">MyFlaskApp</a>
    </div>
    <div id="navbar" class="collapse navbar-collapse">
      <ul class="nav navbar-nav">
        <li><a href="/">Home</a></li>
        <li><a href="/about">About</a></li>
        <li><a href="/articles">Articles</a></li>
      </ul>
    </div><!--/.nav-collapse -->
  </div>
</nav>

1 个答案:

答案 0 :(得分:2)

您正在导入 Bootstrap 4 ,但尝试使用 Bootstrap 3 语法。

解决此问题的最简单方法是简单地导入Boostrap 3,这可以通过URL https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css完成。请注意,虽然样式不是必需的,但您可能还希望通过https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js将JavaScript切换到相同的版本。

这个简单的更改会更正您的导航栏,如下所示:

<!DOCTYPE html>
<html>

<head>
  <title>MyFlaskApp</title>
  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
</head>

<body>

  <!-- _navbar.html -->
  <nav class="navbar navbar-default">
    <div class="container">
      <div class="navbar-header">
        <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#navbar" aria-expanded="false" aria-controls="navbar">
        <span class="sr-only">Toggle navigation</span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
      </button>
        <a class="navbar-brand" href="#">MyFlaskApp</a>
      </div>
      <div id="navbar" class="collapse navbar-collapse">
        <ul class="nav navbar-nav">
          <li><a href="/">Home</a></li>
          <li><a href="/about">About</a></li>
          <li><a href="/articles">Articles</a></li>
        </ul>
      </div>
      <!--/.nav-collapse -->
    </div>
  </nav>
  
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
  
</body>

</html>

希望这有帮助! :)