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Bootstrap 下拉菜单(Dropdowns)


本章将重点介绍 Bootstrap 下拉菜单。下拉菜单是可切换的,是以列表格式显示链接的上下文菜单。这可以通过与 下拉菜单(Dropdown) JavaScript 插件 的互动来实现。

如需使用下列菜单,只需要在 class .dropdown 内加上下拉菜单即可。下面的实例演示了基本的下拉菜单:

<!DOCTYPE html>
<html>
<head>
   <title>Bootstrap 实例 - 下拉菜单(Dropdowns)</title>
   <link href="/bootstrap/css/bootstrap.min.css" rel="stylesheet">
   <script src="/scripts/jquery.min.js"></script>
   <script src="/bootstrap/js/bootstrap.min.js"></script>
</head>
<body>

<div class="dropdown">
   <button type="button" class="btn dropdown-toggle" id="dropdownMenu1" 
      data-toggle="dropdown">
      主题
      <span class="caret"></span>
   </button>
   <ul class="dropdown-menu" role="menu" aria-labelledby="dropdownMenu1">
      <li role="presentation">
         <a role="menuitem" tabindex="-1" href="#">Java</a>
      </li>
      <li role="presentation">
         <a role="menuitem" tabindex="-1" href="#">数据挖掘</a>
      </li>
      <li role="presentation">
         <a role="menuitem" tabindex="-1" href="#">
            数据通信/网络
         </a>
      </li>
      <li role="presentation" class="divider"></li>
      <li role="presentation">
         <a role="menuitem" tabindex="-1" href="#">分离的链接</a>
      </li>
   </ul>
</div>


</body>
</html>

结果如下所示:

基本的下拉菜单(Dropdowns)

选项

对齐

通过向 .dropdown-menu 添加 class .pull-right 来向右对齐下拉菜单。下面的实例演示了这点:

<!DOCTYPE html>
<html>
<head>
   <title>Bootstrap 实例 - 向右对齐下拉菜单</title>
   <link href="/bootstrap/css/bootstrap.min.css" rel="stylesheet">
   <script src="/scripts/jquery.min.js"></script>
   <script src="/bootstrap/js/bootstrap.min.js"></script>
</head>
<body>

<div class="dropdown">
   <button type="button" class="btn dropdown-toggle" id="dropdownMenu1" 
      data-toggle="dropdown">主题
      <span class="caret"></span>
   </button>
   <ul class="dropdown-menu pull-right" role="menu" 
      aria-labelledby="dropdownMenu1">
      <li role="presentation">
         <a role="menuitem" tabindex="-1" href="#">Java</a>
      </li>
      <li role="presentation">
         <a role="menuitem" tabindex="-1" href="#">数据挖掘</a>
      </li>
      <li role="presentation">
         <a role="menuitem" tabindex="-1" href="#">
            数据通信/网络
         </a>
      </li>
      <li role="presentation" class="divider"></li>
      <li role="presentation">
         <a role="menuitem" tabindex="-1" href="#">分离的链接</a>
      </li>
   </ul>
</div>


</body>
</html>

结果如下所示:

向右对齐下拉菜单

标题

您可以使用 class dropdown-header 向下拉菜单的标签区域添加标题。下面的实例演示了这点:

<!DOCTYPE html>
<html>
<head>
   <title>Bootstrap 实例 - 下拉菜单标题</title>
   <link href="/bootstrap/css/bootstrap.min.css" rel="stylesheet">
   <script src="/scripts/jquery.min.js"></script>
   <script src="/bootstrap/js/bootstrap.min.js"></script>
</head>
<body>

<div class="dropdown">
   <button type="button" class="btn dropdown-toggle" id="dropdownMenu1" 
      data-toggle="dropdown">
      主题
      <span class="caret"></span>
   </button>
   <ul class="dropdown-menu" role="menu" aria-labelledby="dropdownMenu1">
      <li role="presentation" class="dropdown-header">下拉菜单标题</li>
      <li role="presentation" >
         <a role="menuitem" tabindex="-1" href="#">Java</a>
      </li>
      <li role="presentation">
         <a role="menuitem" tabindex="-1" href="#">数据挖掘</a>
      </li>
      <li role="presentation">
         <a role="menuitem" tabindex="-1" href="#">
            数据通信/网络
         </a>
      </li>
      <li role="presentation" class="divider"></li>
      <li role="presentation" class="dropdown-header">下拉菜单标题</li>
      <li role="presentation">
         <a role="menuitem" tabindex="-1" href="#">分离的链接</a>
      </li>
   </ul>
</div>


</body>
</html>

结果如下所示:

下拉菜单标题