Bootstrap 下拉菜单（Dropdown）插件

Bootstrap 下拉菜单 这一章讲解了下拉菜单，但是没有涉及到交互部分，本章将具体讲解下拉菜单的交互。使用下拉菜单（Dropdown）插件，您可以向任何组件（比如导航栏、标签页、胶囊式导航菜单、按钮等）添加下拉菜单。

如果您想要单独引用该插件的功能，那么您需要引用 dropdown.js 。或者，正如 Bootstrap 插件概览 一章中所提到，您可以引用 bootstrap.js 或压缩版的 bootstrap.min.js 。

用法

您可以切换下拉菜单（Dropdown）插件的隐藏内容：

  • 通过 data 属性 ：向链接或按钮添加 data-toggle="dropdown" 来切换下拉菜单，如下所示： 
    											<div class="dropdown">
  <a data-toggle="dropdown" href="#">下拉菜单（Dropdown）触发器</a>
  <ul class="dropdown-menu" role="menu" aria-labelledby="dLabel">
    ...
  </ul>
</div>

    如果您需要保持链接完整（在浏览器不启用 JavaScript 时有用），请使用 data-target 属性代替 href="#" ： 

    											<div class="dropdown">
  <a id="dLabel" role="button" data-toggle="dropdown" data-target="#" href="/page.html">
    下拉菜单（Dropdown） <span class="caret"></span>
  </a>
  <ul class="dropdown-menu" role="menu" aria-labelledby="dLabel">
    ...
  </ul>
</div>
  • 通过 JavaScript ：通过 JavaScript 调用下拉菜单切换，请使用下面的方法： 
    											$('.dropdown-toggle').dropdown()

实例

在导航栏内

下面的实例演示了在导航栏内的下拉菜单的用法：

实例

< nav class = " navbar navbar-default " role = " navigation " > < div class = " container-fluid " > < div class = " navbar-header " > < a class = " navbar-brand " href = " # " > 云搜索MX教程 </ 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 = " # " > 分离的链接 </ a > </ li > < li class = " divider " > </ li > < li > < a href = " # " > 另一个分离的链接 </ a > </ li > </ ul > </ li > </ ul > </ div > </ div > </ nav >

尝试一下 »

结果如下所示：

在标签页内

下面的实例演示了在标签页内的下拉菜单的用法：

实例

< p > 带有下拉菜单的标签页 </ 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 = " # " > 分离的链接 </ a > </ li > </ ul > </ li > < li > < a href = " # " > PHP </ a > </ li > </ ul >

尝试一下 »

结果如下所示：

带有下拉菜单的标签页

选项

没有选项。

方法

下拉菜单切换有一个简单的方法用来显示或隐藏下拉菜单。 

									$().dropdown('toggle')

实例

下面的实例演示了下拉菜单（Dropdown）插件方法的用法：

实例

< nav class = " navbar navbar-default " role = " navigation " > < div class = " container-fluid " > < div class = " navbar-header " > < a class = " navbar-brand " href = " # " > 云搜索MX教程 </ 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 " data-toggle = " dropdown " > 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 = " # " > 分离的链接 </ a > </ li > < li class = " divider " > </ li > < li > < a href = " # " > 另一个分离的链接 </ a > </ li > </ ul > </ li > </ ul > </ div > </ div > </ nav > </ div > < script > $(function() { $(".dropdown-toggle").dropdown('toggle'); }); </ script >

尝试一下 »

结果如下所示：

固定到顶部