Bootstrap - 下拉選單外掛

---

---

使用下拉選單外掛，您可以將下拉選單新增到任何元件，例如導航欄、選項卡、藥丸和按鈕。

如果您想單獨包含此外掛的功能，則需要 dropdown.js。否則，如在章節 Bootstrap 外掛概述 中所述，您可以包含 bootstrap.js 或最小化的 bootstrap.min.js。

用法

您可以切換下拉選單外掛的隱藏內容 -

• 透過資料屬性 - 向連結或按鈕新增 data-toggle = "dropdown" 以切換下拉選單，如下所示 -

<div class = "dropdown">
   <a data-toggle = "dropdown" href = "#">Dropdown trigger</a>
   
   <ul class = "dropdown-menu" role = "menu" aria-labelledby = "dLabel">
      ...
   </ul>
	
</div>

• 如果您需要保持連結完整（如果瀏覽器未啟用 JavaScript 則很有用），請使用 data-target 屬性代替 href = "#" -

<div class = "dropdown">
   <a id = "dLabel" role = "button" data-toggle = "dropdown" data-target = "#" href = "/page.html">
      Dropdown 
      <span class = "caret"></span>
   </a>
   
   <ul class = "dropdown-menu" role = "menu" aria-labelledby = "dLabel">
      ...
   </ul>
	
</div>

• 透過 JavaScript - 要透過 JavaScript 呼叫下拉選單切換，請使用以下方法 -

$('.dropdown-toggle').dropdown()

示例

在導航欄內

以下示例演示了在導航欄內使用下拉選單 -

<nav class = "navbar navbar-default" role = "navigation">

   <div class = "navbar-header">
      <a class = "navbar-brand" href = "#">TutorialsPoint</a>
   </div>
   
   <div>
      <ul class = "nav navbar-nav">
         <li class = "active"><a href = "#">iOS</a></li>
         <li><a href = "#">SVN</a></li>
         
         <li class = "dropdown">
            <a href = "#" class = "dropdown-toggle" data-toggle = "dropdown">
               Java 
               <b class="caret"></b>
            </a>
            
            <ul class = "dropdown-menu">
               <li><a href = "#">jmeter</a></li>
               <li><a href = "#">EJB</a></li>
               <li><a href = "#">Jasper Report</a></li>
               
               <li class = "divider"></li>
               <li><a href = "#">Separated link</a></li>
               
               <li class = "divider"></li>
               <li><a href = "#">One more separated link</a></li>
            </ul>
            
         </li>
      </ul>
   </div>
   
</nav>

在選項卡內

以下示例演示了在選項卡內使用下拉選單 -

<p>Tabs With Dropdown Example</p>

<ul class = "nav nav-tabs">
   <li class = "active"><a href = "#">Home</a></li>
   <li><a href = "#">SVN</a></li>
   <li><a href = "#">iOS</a></li>
   <li><a href = "#">VB.Net</a></li>
   
   <li class = "dropdown">
      <a class = "dropdown-toggle" data-toggle = "dropdown" href = "#">
         Java 
         <span class = "caret"></span>
      </a>
      
      <ul class = "dropdown-menu">
         <li><a href = "#">Swing</a></li>
         <li><a href = "#">jMeter</a></li>
         <li><a href = "#">EJB</a></li>
         
         <li class = "divider"></li>
         <li><a href = "#">Separated link</a></li>
      </ul>
      
   </li>
	
   <li><a href = "#">PHP</a></li>
</ul>

選項

沒有選項。

方法

下拉選單切換有一個簡單的方法來顯示或隱藏下拉選單。

$().dropdown('toggle')

示例

以下示例演示了下拉選單外掛方法的用法。

<nav class = "navbar navbar-default" role = "navigation">
   <div class = "navbar-header">
      <a class = "navbar-brand" href = "#">TutorialsPoint</a>
   </div>

   <div id = "myexample">
      <ul class = "nav navbar-nav">
         <li class = "active"><a href = "#">iOS</a></li>
         <li><a href = "#">SVN</a></li>
			
         <li class = "dropdown">
            <a href = "#" class = "dropdown-toggle">Java <b class = "caret"></b></a>
            
            <ul class = "dropdown-menu">
               <li><a id = "action-1" href = "#">jmeter</a></li>
               <li><a href = "#">EJB</a></li>
               <li><a href = "#">Jasper Report</a></li>
               
               <li class = "divider"></li>
               <li><a href = "#">Separated link</a></li>
               
               <li class = "divider"></li>
               <li><a href = "#">One more separated link</a></li>
            </ul>
            
         </li>
			
      </ul>
   </div>
   
</nav>

<script>
   $(function(){
      $(".dropdown-toggle").dropdown('toggle');
   }); 
</script>