Bootstrap 下拉菜單（Dropdowns）

本章將重點(diǎn)介紹 Bootstrap 下拉菜單。下拉菜單是可切換的，是以列表格式顯示鏈接的上下文菜單。這可以通過與 下拉菜單（Dropdown） JavaScript 插件 的互動來實(shí)現(xiàn)。

如需使用下拉菜單，只需要在 class .dropdown 內(nèi)加上下拉菜單即可。下面的實(shí)例演示了基本的下拉菜單：

<!DOCTYPE html>
<html>
<head>
   <title>Bootstrap 實(shí)例 - 下拉菜單（Dropdowns）</title>
   <link  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="stylesheet">
   <script src="http://cdn.bootcss.com/jquery/2.1.1/jquery.min.js" rel="external nofollow"  rel="external nofollow"  rel="external nofollow" ></script>
   <script src="http://cdn.bootcss.com/bootstrap/3.3.6/js/bootstrap.min.js" rel="external nofollow"  rel="external nofollow"  rel="external nofollow" ></script>
</head>
<body>

<div class="dropdown">
   <button type="button" class="btn dropdown-toggle" id="dropdownMenu1" 
      data-toggle="dropdown">
      主題
      <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="#">數(shù)據(jù)挖掘</a>
      </li>
      <li role="presentation">
         <a role="menuitem" tabindex="-1" href="#">
            數(shù)據(jù)通信/網(wǎng)絡(luò)
         </a>
      </li>
      <li role="presentation" class="divider"></li>
      <li role="presentation">
         <a role="menuitem" tabindex="-1" href="#">分離的鏈接</a>
      </li>
   </ul>
</div>


</body>
</html>

嘗試一下 ?

結(jié)果如下所示：


選項

對齊

通過向 .dropdown-menu 添加 class .pull-right 來向右對齊下拉菜單。下面的實(shí)例演示了這點(diǎn)：

<!DOCTYPE html>
<html>
<head>
   <title>Bootstrap 實(shí)例 - 向右對齊下拉菜單</title>
   <link  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="stylesheet">
   <script src="http://cdn.bootcss.com/jquery/2.1.1/jquery.min.js" rel="external nofollow"  rel="external nofollow"  rel="external nofollow" ></script>
   <script src="http://cdn.bootcss.com/bootstrap/3.3.6/js/bootstrap.min.js" rel="external nofollow"  rel="external nofollow"  rel="external nofollow" ></script>
</head>
<body>

<div class="dropdown">
   <button type="button" class="btn dropdown-toggle" id="dropdownMenu1" 
      data-toggle="dropdown">主題
      <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="#">數(shù)據(jù)挖掘</a>
      </li>
      <li role="presentation">
         <a role="menuitem" tabindex="-1" href="#">
            數(shù)據(jù)通信/網(wǎng)絡(luò)
         </a>
      </li>
      <li role="presentation" class="divider"></li>
      <li role="presentation">
         <a role="menuitem" tabindex="-1" href="#">分離的鏈接</a>
      </li>
   </ul>
</div>


</body>
</html>

嘗試一下 ?

結(jié)果如下所示：


標(biāo)題

您可以使用 class dropdown-header 向下拉菜單的標(biāo)簽區(qū)域添加標(biāo)題。下面的實(shí)例演示了這點(diǎn)：

<!DOCTYPE html>
<html>
<head>
   <title>Bootstrap 實(shí)例 - 下拉菜單標(biāo)題</title>
   <link  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="external nofollow" target="_blank"  rel="stylesheet">
   <script src="http://cdn.bootcss.com/jquery/2.1.1/jquery.min.js" rel="external nofollow"  rel="external nofollow"  rel="external nofollow" ></script>
   <script src="http://cdn.bootcss.com/bootstrap/3.3.6/js/bootstrap.min.js" rel="external nofollow"  rel="external nofollow"  rel="external nofollow" ></script>
</head>
<body>

<div class="dropdown">
   <button type="button" class="btn dropdown-toggle" id="dropdownMenu1" 
      data-toggle="dropdown">
      主題
      <span class="caret"></span>
   </button>
   <ul class="dropdown-menu" role="menu" aria-labelledby="dropdownMenu1">
      <li role="presentation" class="dropdown-header">下拉菜單標(biāo)題</li>
      <li role="presentation" >
         <a role="menuitem" tabindex="-1" href="#">Java</a>
      </li>
      <li role="presentation">
         <a role="menuitem" tabindex="-1" href="#">數(shù)據(jù)挖掘</a>
      </li>
      <li role="presentation">
         <a role="menuitem" tabindex="-1" href="#">
            數(shù)據(jù)通信/網(wǎng)絡(luò)
         </a>
      </li>
      <li role="presentation" class="divider"></li>
      <li role="presentation" class="dropdown-header">下拉菜單標(biāo)題</li>
      <li role="presentation">
         <a role="menuitem" tabindex="-1" href="#">分離的鏈接</a>
      </li>
   </ul>
</div>


</body>
</html>

嘗試一下 ?

結(jié)果如下所示：