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
=
"
#
"
>
菜鸟教程
</
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：

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
=
"
#
"
>
菜鸟教程
</
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：