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Bootstrap 按钮下拉菜单

本章将讲解如何使用 Bootstrap class 向按钮添加下拉菜单。如需向按钮添加下拉菜单，只需要简单地在在一个 .btn-group 中放置按钮和下拉菜单即可。您也可以使用 <span class="caret"></span> 来指示按钮作为下拉菜单。

下面的实例演示了一个基本的简单的按钮下拉菜单：

<!DOCTYPE html>
<html>
<head>
   <title>Bootstrap 实例 - 基本的按钮下拉菜单</title>
   <link href="//cdn.bootcss.com/bootstrap/3.3.6/css/bootstrap.min.css" rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="stylesheet">
   <script src="//cdn.bootcss.com/jquery/2.1.1/jquery.min.js" rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow" ></script>
   <script src="//cdn.bootcss.com/bootstrap/3.3.6/js/bootstrap.min.js" rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow" ></script>
</head>
<body>

<div class="btn-group">
   <button type="button" class="btn btn-default dropdown-toggle"        data-toggle="dropdown">
      默认 <span class="caret"></span>
   </button>
   <ul class="dropdown-menu" role="menu">
      <li><a href="#">功能</a></li>
      <li><a href="#">另一个功能</a></li>
      <li><a href="#">其他</a></li>
      <li class="divider"></li>
      <li><a href="#">分离的链接</a></li>
   </ul>
</div>
<div class="btn-group">
   <button type="button" class="btn btn-primary dropdown-toggle"        data-toggle="dropdown">
      原始 <span class="caret"></span>
   </button>
   <ul class="dropdown-menu" role="menu">
      <li><a href="#">功能</a></li>
      <li><a href="#">另一个功能</a></li>
      <li><a href="#">其他</a></li>
      <li class="divider"></li>
      <li><a href="#">分离的链接</a></li>
   </ul>
</div>

</body>
</html>

结果如下所示：

基本的按钮下拉菜单

分割的按钮下拉菜单

分割的按钮下拉菜单使用与下拉菜单按钮大致相同的样式，但是对下拉菜单添加了原始的功能。分割按钮的左边是原始的功能，右边是显示下拉菜单的切换。

<!DOCTYPE html>
<html>
<head>
   <title>Bootstrap 实例 - 分割的按钮下拉菜单</title>
   <link href="//cdn.bootcss.com/bootstrap/3.3.6/css/bootstrap.min.css" rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="stylesheet">
   <script src="//cdn.bootcss.com/jquery/2.1.1/jquery.min.js" rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow" ></script>
   <script src="//cdn.bootcss.com/bootstrap/3.3.6/js/bootstrap.min.js" rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow" ></script>
</head>
<body>

<div class="btn-group">
   <button type="button" class="btn btn-default">默认</button>
   <button type="button" class="btn btn-default dropdown-toggle"        data-toggle="dropdown">
      <span class="caret"></span>
      <span class="sr-only">切换下拉菜单</span>
   </button>
   <ul class="dropdown-menu" role="menu">
      <li><a href="#">功能</a></li>
      <li><a href="#">另一个功能</a></li>
      <li><a href="#">其他</a></li>
      <li class="divider"></li>
      <li><a href="#">分离的链接</a></li>
   </ul>
</div>
<div class="btn-group">
   <button type="button" class="btn btn-primary">原始</button>
   <button type="button" class="btn btn-primary dropdown-toggle"        data-toggle="dropdown">
      <span class="caret"></span>
      <span class="sr-only">切换下拉菜单</span>
   </button>
   <ul class="dropdown-menu" role="menu">
      <li><a href="#">功能</a></li>
      <li><a href="#">另一个功能</a></li>
      <li><a href="#">其他</a></li>
      <li class="divider"></li>
      <li><a href="#">分离的链接</a></li>
   </ul>
</div>

</body>
</html>

结果如下所示：

分割的按钮下拉菜单

按钮下拉菜单的大小

您可以使用带有各种大小按钮的下拉菜单：.btn-large、.btn-sm 或 .btn-xs。

<!DOCTYPE html>
<html>
<head>
   <title>Bootstrap 实例 - 按钮下拉菜单的大小</title>
   <link href="//cdn.bootcss.com/bootstrap/3.3.6/css/bootstrap.min.css" rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="stylesheet">
   <script src="//cdn.bootcss.com/jquery/2.1.1/jquery.min.js" rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow" ></script>
   <script src="//cdn.bootcss.com/bootstrap/3.3.6/js/bootstrap.min.js" rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow" ></script>
</head>
<body>

<div class="btn-group">
   <button type="button" class="btn btn-default dropdown-toggle btn-lg"        data-toggle="dropdown">
      默认 <span class="caret"></span>
   </button>
   <ul class="dropdown-menu" role="menu">
      <li><a href="#">功能</a></li>
      <li><a href="#">另一个功能</a></li>
      <li><a href="#">其他</a></li>
      <li class="divider"></li>
      <li><a href="#">分离的链接</a></li>
   </ul>
</div>
<div class="btn-group">
   <button type="button" class="btn btn-primary dropdown-toggle btn-sm"        data-toggle="dropdown">
      原始 <span class="caret"></span>
   </button>
   <ul class="dropdown-menu" role="menu">
      <li><a href="#">功能</a></li>
      <li><a href="#">另一个功能</a></li>
      <li><a href="#">其他</a></li>
      <li class="divider"></li>
      <li><a href="#">分离的链接</a></li>
   </ul>
</div>
<div class="btn-group">
   <button type="button" class="btn btn-success dropdown-toggle btn-xs"        data-toggle="dropdown">
      成功 <span class="caret"></span>
   </button>
   <ul class="dropdown-menu" role="menu">
      <li><a href="#">功能</a></li>
      <li><a href="#">另一个功能</a></li>
      <li><a href="#">其他</a></li>
      <li class="divider"></li>
      <li><a href="#">分离的链接</a></li>
   </ul>
</div>

</body>
</html>

结果如下所示：

按钮下拉菜单的大小

按钮上拉菜单

菜单也可以往上拉伸的，只需要简单地向父 .btn-group 容器添加 .dropup 即可。

<!DOCTYPE html>
<html>
<head>
   <title>Bootstrap 实例 - 按钮上拉菜单</title>
   <link href="//cdn.bootcss.com/bootstrap/3.3.6/css/bootstrap.min.css" rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="stylesheet">
   <script src="//cdn.bootcss.com/jquery/2.1.1/jquery.min.js" rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow" ></script>
   <script src="//cdn.bootcss.com/bootstrap/3.3.6/js/bootstrap.min.js" rel="external nofollow"  rel="external nofollow"  rel="external nofollow"  rel="external nofollow" ></script>
</head>
<body>

<div class="row" style="margin-left:50px; margin-top:200px">
   <div class="btn-group dropup">
      <button type="button" class="btn btn-default dropdown-toggle"           data-toggle="dropdown">
         默认 <span class="caret"></span>
      </button>
      <ul class="dropdown-menu" role="menu">
         <li><a href="#">功能</a></li>
         <li><a href="#">另一个功能</a></li>
         <li><a href="#">其他</a></li>
         <li class="divider"></li>
         <li><a href="#">分离的链接</a></li>
      </ul>
   </div>
   <div class="btn-group dropup">
      <button type="button" class="btn btn-primary dropdown-toggle"           data-toggle="dropdown">
         原始 <span class="caret"></span>
      </button>
      <ul class="dropdown-menu" role="menu">
         <li><a href="#">功能</a></li>
         <li><a href="#">另一个功能</a></li>
         <li><a href="#">其他</a></li>
         <li class="divider"></li>
         <li><a href="#">分离的链接</a></li>
      </ul>
   </div>
</div>

</body>
</html>

结果如下所示：

按钮上拉菜单

提示：对于Bootstrap中的按钮，你可以设置每个按钮的样式，请参考Bootstrap编程实战的“设定Bootstrap按钮的样式”部分！

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