Bootstrap 下拉菜单（Dropdowns）

本章将重点介绍 Bootstrap 下拉菜单。下拉菜单是可切换的，是以列表格式显示链接的上下文菜单。这可以通过与 下拉菜单（Dropdown） JavaScript 插件 的互动来实现。

如需使用下拉菜单，只需要在 class .dropdown 内加上下拉菜单即可。下面的实例演示了基本的下拉菜单：

实例

<
div

class
=
"
dropdown
"
>

<
button

type
=
"
button
"

class
=
"
btn dropdown-toggle
"

id
=
"
dropdownMenu1
"

data-toggle
=
"
dropdown
"
>
主题
<
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
=
"
#
"
>
数据挖掘
</
a
>

</
li
>

<
li

role
=
"
presentation
"
>

<
a

role
=
"
menuitem
"

tabindex
=
"
-1
"

href
=
"
#
"
>
数据通信/网络
</
a
>

</
li
>

<
li

role
=
"
presentation
"

class
=
"
divider
"
>
</
li
>

<
li

role
=
"
presentation
"
>

<
a

role
=
"
menuitem
"

tabindex
=
"
-1
"

href
=
"
#
"
>
分离的链接
</
a
>

</
li
>

</
ul
>

</
div
>

尝试一下 »

结果如下所示：

选项

对齐

通过向 .dropdown-menu 添加 class .pull-right 来向右对齐下拉菜单。下面的实例演示了这点：

实例

<
div

class
=
"
dropdown
"
>

<
button

type
=
"
button
"

class
=
"
btn dropdown-toggle
"

id
=
"
dropdownMenu1
"

data-toggle
=
"
dropdown
"
>
主题
<
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
=
"
#
"
>
数据挖掘
</
a
>

</
li
>

<
li

role
=
"
presentation
"
>

<
a

role
=
"
menuitem
"

tabindex
=
"
-1
"

href
=
"
#
"
>
数据通信/网络
</
a
>

</
li
>

<
li

role
=
"
presentation
"

class
=
"
divider
"
>
</
li
>

<
li

role
=
"
presentation
"
>

<
a

role
=
"
menuitem
"

tabindex
=
"
-1
"

href
=
"
#
"
>
分离的链接
</
a
>

</
li
>

</
ul
>

</
div
>

尝试一下 »

结果如下所示：

标题

您可以使用 class dropdown-header 向下拉菜单的标签区域添加标题。下面的实例演示了这点：

实例

<
div

class
=
"
dropdown
"
>

<
button

type
=
"
button
"

class
=
"
btn dropdown-toggle
"

id
=
"
dropdownMenu1
"

data-toggle
=
"
dropdown
"
>
主题
<
span

class
=
"
caret
"
>
</
span
>

</
button
>

<
ul

class
=
"
dropdown-menu
"

role
=
"
menu
"

aria-labelledby
=
"
dropdownMenu1
"
>

<
li

role
=
"
presentation
"

class
=
"
dropdown-header
"
>
下拉菜单标题
</
li
>

<
li

role
=
"
presentation
"
>

<
a

role
=
"
menuitem
"

tabindex
=
"
-1
"

href
=
"
#
"
>
Java
</
a
>

</
li
>

<
li

role
=
"
presentation
"
>

<
a

role
=
"
menuitem
"

tabindex
=
"
-1
"

href
=
"
#
"
>
数据挖掘
</
a
>

</
li
>

<
li

role
=
"
presentation
"
>

<
a

role
=
"
menuitem
"

tabindex
=
"
-1
"

href
=
"
#
"
>
数据通信/网络
</
a
>

</
li
>

<
li

role
=
"
presentation
"

class
=
"
divider
"
>
</
li
>

<
li

role
=
"
presentation
"

class
=
"
dropdown-header
"
>
下拉菜单标题
</
li
>

<
li

role
=
"
presentation
"
>

<
a

role
=
"
menuitem
"

tabindex
=
"
-1
"

href
=
"
#
"
>
分离的链接
</
a
>

</
li
>

</
ul
>

</
div
>

尝试一下 »

结果如下所示：

更多实例