Dropdown 插件（Dropdown Plugin）

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2023-12-01

使用Dropdown插件，您可以将下拉菜单添加到任何组件，如导航栏，选项卡，药片和按钮。

如果您想单独包含此插件功能，则需要dropdown.js 。另外，如Bootstrap插件概述一章所述，您可以包含bootstrap.js或缩小的bootstrap.min.js 。

用法 (Usage)

您可以切换下拉插件的隐藏内容 -

Via data attributes - 将data-toggle = "dropdown"到链接或按钮以切换下拉列表，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>

如果您需要保持链接完整（如果浏览器未启用JavaScript，这很有用），请使用data-target属性而不是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>

Via JavaScript - 要Via JavaScript调用下拉切换，请使用以下方法 -

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

例子 (Example)

Within Navbar

以下示例演示了导航栏中下拉菜单的用法 -

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

Within Tabs

以下示例演示了选项卡中下拉菜单的用法 -

<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>

选项 (Options)

There are no options.

方法 (Methods)

下拉切换有一种显示或隐藏下拉列表的简单方法。

$().dropdown('toggle')

例子 (Example)

以下示例演示了dropdown插件方法的用法。

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