Bootstrap 3 附有网格列

Question

我正在使用 Bootstrap 3 创建一个网站。我想要一个从横幅下方开始的导航栏，并且使用 .affix 插件。

在第一个版本的代码中，页面按预期滚动。当您向下滚动时，页面中的文本会滚动 "under" 导航栏：

<!DOCTYPE html>
<html>
<head>
<title>Bootstrap Example</title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>
  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
  <style>
  .affix {
      top: 0;
      width: 100%;
  }

  .affix + .container-fluid {
      padding-top: 70px;
  }
  h1 {
      color:darkred
  }
  </style>
</head>
<body>

<div class="container-fluid" style="background-color:#F44336;color:#fff;height:200px;">
  <h1>Bootstrap Affix Example</h1>
</div>

<nav class="navbar navbar-inverse" data-spy="affix" data-offset-top="197">
  <ul class="nav navbar-nav">
    <li class="active"><a href="#">Basic Topnav</a></li>
    <li><a href="#">Page 1</a></li>
    <li><a href="#">Page 2</a></li>
    <li><a href="#">Page 3</a></li>
  </ul>
</nav>

<div class="container">
  <h1>Some text to enable scrolling</h1>
  <h1>Some text to enable scrolling</h1>
  <h1>Some text to enable scrolling</h1>
  <h1>Some text to enable scrolling</h1>
  <h1>Some text to enable scrolling</h1>
  <h1>Some text to enable scrolling</h1>
  <h1>Some text to enable scrolling</h1>
  <h1>Some text to enable scrolling</h1>
  <h1>Some text to enable scrolling</h1>
  <h1>Some text to enable scrolling</h1>
  <h1>Some text to enable scrolling</h1>
  <h1>Some text to enable scrolling</h1>
  <h1>Some text to enable scrolling</h1>
  <h1>Some text to enable scrolling</h1>
  <h1>Some text to enable scrolling</h1>
  <h1>Some text to enable scrolling</h1>
  <h1>Some text to enable scrolling</h1>
  <h1>Some text to enable scrolling</h1>
  <h1>Some text to enable scrolling</h1>
  <h1>Some text to enable scrolling</h1>
  <h1>Some text to enable scrolling</h1>
  <h1>Some text to enable scrolling</h1>
</div>

</body>
</html>

但是，在第二个版本的代码中，我将文本放在一个容器内，然后放在一行内，最后是一个跨越所有十二列的网格列。现在，当我向下滚动时，文本会滚动 "above" 导航栏。如何防止网格列中的内容滚动 "above" 导航栏？

<!DOCTYPE html>
<html>
<head>
  <title>Bootstrap Example</title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>
  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
  <style>
  .affix {
      top: 0;
      width: 100%;
  }

  .affix + .container-fluid {
      padding-top: 70px;
  }
  h1 {
      color:darkred
  }
  </style>
</head>
<body>

<div class="container-fluid" style="background-color:#F44336;color:#fff;height:200px;">
  <h1>Bootstrap Affix Example</h1>
</div>

<nav class="navbar navbar-inverse" data-spy="affix" data-offset-top="197">
  <ul class="nav navbar-nav">
    <li class="active"><a href="#">Basic Topnav</a></li>
    <li><a href="#">Page 1</a></li>
    <li><a href="#">Page 2</a></li>
    <li><a href="#">Page 3</a></li>
  </ul>
</nav>

<div class="container">
<div class="row">
<div class="col-md-12">
  <h1>Some text to enable scrolling</h1>
  <h1>Some text to enable scrolling</h1>
  <h1>Some text to enable scrolling</h1>
  <h1>Some text to enable scrolling</h1>
  <h1>Some text to enable scrolling</h1>
  <h1>Some text to enable scrolling</h1>
  <h1>Some text to enable scrolling</h1>
  <h1>Some text to enable scrolling</h1>
  <h1>Some text to enable scrolling</h1>
  <h1>Some text to enable scrolling</h1>
  <h1>Some text to enable scrolling</h1>
  <h1>Some text to enable scrolling</h1>
  <h1>Some text to enable scrolling</h1>
  <h1>Some text to enable scrolling</h1>
  <h1>Some text to enable scrolling</h1>
  <h1>Some text to enable scrolling</h1>
  <h1>Some text to enable scrolling</h1>
  <h1>Some text to enable scrolling</h1>
  <h1>Some text to enable scrolling</h1>
  <h1>Some text to enable scrolling</h1>
  <h1>Some text to enable scrolling</h1>
  <h1>Some text to enable scrolling</h1>
</div>
</div>
</div>

</body>
</html>

Answer 1

这是一个 z-index 问题

加上这个css--

 .affix {

  z-index:100;
   }

工作示例

<!doctype html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
 <link rel="stylesheet" href="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css">
          <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
          <script src="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script>
           <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css">
          <style>
  .affix {
      top: 0;
      width: 100%;
      z-index:100;
  }

  .affix + .container-fluid {
      padding-top: 70px;
  }
  h1 {
      color:darkred
  }
  </style>
</head>
<body>

<div class="container-fluid" style="background-color:#F44336;color:#fff;height:200px;">
  <h1>Bootstrap Affix Example</h1>
</div>

<nav class="navbar navbar-inverse" data-spy="affix" data-offset-top="197">
  <ul class="nav navbar-nav">
    <li class="active"><a href="#">Basic Topnav</a></li>
    <li><a href="#">Page 1</a></li>
    <li><a href="#">Page 2</a></li>
    <li><a href="#">Page 3</a></li>
  </ul>
</nav>

<div class="container">
<div class="row">
<div class="col-md-12">
  <h1>Some text to enable scrolling</h1>
  <h1>Some text to enable scrolling</h1>
  <h1>Some text to enable scrolling</h1>
  <h1>Some text to enable scrolling</h1>
  <h1>Some text to enable scrolling</h1>
  <h1>Some text to enable scrolling</h1>
  <h1>Some text to enable scrolling</h1>
  <h1>Some text to enable scrolling</h1>
  <h1>Some text to enable scrolling</h1>
  <h1>Some text to enable scrolling</h1>
  <h1>Some text to enable scrolling</h1>
  <h1>Some text to enable scrolling</h1>
  <h1>Some text to enable scrolling</h1>
  <h1>Some text to enable scrolling</h1>
  <h1>Some text to enable scrolling</h1>
  <h1>Some text to enable scrolling</h1>
  <h1>Some text to enable scrolling</h1>
  <h1>Some text to enable scrolling</h1>
  <h1>Some text to enable scrolling</h1>
  <h1>Some text to enable scrolling</h1>
  <h1>Some text to enable scrolling</h1>
  <h1>Some text to enable scrolling</h1>
</div>
</div>
</div>

</body>
</html>

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