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????? ??? ??? / Bootstrap 下拉菜單

Bootstrap 下拉菜單

本章將重點介紹 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 的互動來實現(xiàn)。

如需使用下列菜單，只需要在 class .dropdown 內加上下拉菜單即可。下面的實例演示了基本的下拉菜單：

<!DOCTYPE html>
<html>
<head>
   <title>Bootstrap 實例 - 下拉菜單（Dropdowns）</title>
  <link href="http://libs.baidu.com/bootstrap/3.0.3/css/bootstrap.min.css" rel="stylesheet">
   <script src="http://libs.baidu.com/jquery/2.0.0/jquery.min.js"></script>
   <script src="http://libs.baidu.com/bootstrap/3.0.3/js/bootstrap.min.js"></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/網絡
         </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>

實例

<!DOCTYPE html>
<html>
<head>
	<meta charset="utf-8"> 
	<title>Bootstrap 實例 - 下拉菜單（Dropdowns）</title>
	<link rel="stylesheet" href="http://cdn.static.runoob.com/libs/bootstrap/3.3.7/css/bootstrap.min.css">
	<script src="http://cdn.static.runoob.com/libs/jquery/2.1.1/jquery.min.js"></script>
	<script src="http://cdn.static.runoob.com/libs/bootstrap/3.3.7/js/bootstrap.min.js"></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/網絡</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>

運行實例 ?

點擊 "運行實例" 按鈕查看在線實例

選項

對齊

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

<!DOCTYPE html>
<html>
<head>
   <title>Bootstrap 實例 - 向右對齊下拉菜單</title>
   <link href="http://libs.baidu.com/bootstrap/3.0.3/css/bootstrap.min.css" rel="stylesheet">
   <script src="http://libs.baidu.com/jquery/2.0.0/jquery.min.js"></script>
   <script src="http://libs.baidu.com/bootstrap/3.0.3/js/bootstrap.min.js"></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/網絡
         </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>

實例

<!DOCTYPE html>
<html>
<head>
	<meta charset="utf-8"> 
	<title>Bootstrap 實例 - 向右對齊下拉菜單</title>
	<link rel="stylesheet" href="http://cdn.static.runoob.com/libs/bootstrap/3.3.7/css/bootstrap.min.css">
	<script src="http://cdn.static.runoob.com/libs/jquery/2.1.1/jquery.min.js"></script>
	<script src="http://cdn.static.runoob.com/libs/bootstrap/3.3.7/js/bootstrap.min.js"></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/網絡</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>

運行實例 ?

點擊 "運行實例" 按鈕查看在線實例

標題

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

<!DOCTYPE html>
<html>
<head>
   <title>Bootstrap 實例 - 下拉菜單標題</title>
   <link href="http://libs.baidu.com/bootstrap/3.0.3/css/bootstrap.min.css" rel="stylesheet">
   <script src="http://libs.baidu.com/jquery/2.0.0/jquery.min.js"></script>
   <script src="http://libs.baidu.com/bootstrap/3.0.3/js/bootstrap.min.js"></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/網絡
         </a>
      </li>
      <li role="presentation" class="divider"></li>
      <li role="presentation" class="dropdown-header">下拉菜單標題</li>
      <li role="presentation">
         <a role="menuitem" tabindex="-1" href="#">分離的鏈接</a>
      </li>
   </ul>
</div>


</body>
</html>

實例

<!DOCTYPE html>
<html>
<head>
	<meta charset="utf-8"> 
	<title>Bootstrap 實例 - 下拉菜單標題</title>
	<link rel="stylesheet" href="http://cdn.static.runoob.com/libs/bootstrap/3.3.7/css/bootstrap.min.css">
	<script src="http://cdn.static.runoob.com/libs/jquery/2.1.1/jquery.min.js"></script>
	<script src="http://cdn.static.runoob.com/libs/bootstrap/3.3.7/js/bootstrap.min.js"></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/網絡
			</a>
		</li>
		<li role="presentation" class="divider"></li>
		<li role="presentation" class="dropdown-header">下拉菜單標題</li>
		<li role="presentation">
			<a role="menuitem" tabindex="-1" href="#">分離的鏈接</a>
		</li>
	</ul>
</div>

</body>
</html>

運行實例 ?

點擊 "運行實例" 按鈕查看在線實例