Bootstrap 按钮下拉菜单

本章将讲解如何使用 Bootstrap class 向按钮添加下拉菜单。如需向按钮添加下拉菜单，只需要简单地在一个 .btn-group 容器中放置按钮和下拉菜单即可。您也可以使用 <span class=”caret”></span> 来指示按钮作为下拉菜单。

下面的实例演示了一个基本的简单的按钮下拉菜单：

实例

<
div

class
=
“
btn-group
“
>

<
button

type
=
“
button
“

class
=
“
btn btn-default dropdown-toggle
“

data-toggle
=
“
dropdown
“
>
默认
<
span

class
=
“
caret
“
>
</
span
>

</
button
>

<
ul

class
=
“
dropdown-menu
“

role
=
“
menu
“
>

<
li
>

<
a

href
=
“
#
“
>
功能
</
a
>

</
li
>

<
li
>

<
a

href
=
“
#
“
>
另一个功能
</
a
>

</
li
>

<
li
>

<
a

href
=
“
#
“
>
其他
</
a
>

</
li
>

<
li

class
=
“
divider
“
>
</
li
>

<
li
>

<
a

href
=
“
#
“
>
分离的链接
</
a
>

</
li
>

</
ul
>

</
div
>

<
div

class
=
“
btn-group
“
>

<
button

type
=
“
button
“

class
=
“
btn btn-primary dropdown-toggle
“

data-toggle
=
“
dropdown
“
>
原始
<
span

class
=
“
caret
“
>
</
span
>

</
button
>

<
ul

class
=
“
dropdown-menu
“

role
=
“
menu
“
>

<
li
>

<
a

href
=
“
#
“
>
功能
</
a
>

</
li
>

<
li
>

<
a

href
=
“
#
“
>
另一个功能
</
a
>

</
li
>

<
li
>

<
a

href
=
“
#
“
>
其他
</
a
>

</
li
>

<
li

class
=
“
divider
“
>
</
li
>

<
li
>

<
a

href
=
“
#
“
>
分离的链接
</
a
>

</
li
>

</
ul
>

</
div
>


尝试一下 »

结果如下所示：

分割的按钮下拉菜单

分割的按钮下拉菜单使用与下拉菜单按钮大致相同的样式，但是对下拉菜单添加了原始的功能。分割按钮的左边是原始的功能，右边是显示下拉菜单的切换。

实例

<
div

class
=
“
btn-group
“
>

<
button

type
=
“
button
“

class
=
“
btn btn-default
“
>
默认
</
button
>

<
button

type
=
“
button
“

class
=
“
btn btn-default dropdown-toggle
“

data-toggle
=
“
dropdown
“
>

<
span

class
=
“
caret
“
>
</
span
>

<
span

class
=
“
sr-only
“
>
切换下拉菜单
</
span
>

</
button
>

<
ul

class
=
“
dropdown-menu
“

role
=
“
menu
“
>

<
li
>
<
a

href
=
“
#
“
>
功能
</
a
>
</
li
>

<
li
>
<
a

href
=
“
#
“
>
另一个功能
</
a
>
</
li
>

<
li
>
<
a

href
=
“
#
“
>
其他
</
a
>
</
li
>

<
li

class
=
“
divider
“
>
</
li
>

<
li
>
<
a

href
=
“
#
“
>
分离的链接
</
a
>
</
li
>

</
ul
>

</
div
>

<
div

class
=
“
btn-group
“
>

<
button

type
=
“
button
“

class
=
“
btn btn-primary
“
>
原始
</
button
>

<
button

type
=
“
button
“

class
=
“
btn btn-primary dropdown-toggle
“

data-toggle
=
“
dropdown
“
>

<
span

class
=
“
caret
“
>
</
span
>

<
span

class
=
“
sr-only
“
>
切换下拉菜单
</
span
>

</
button
>

<
ul

class
=
“
dropdown-menu
“

role
=
“
menu
“
>

<
li
>
<
a

href
=
“
#
“
>
功能
</
a
>
</
li
>

<
li
>
<
a

href
=
“
#
“
>
另一个功能
</
a
>
</
li
>

<
li
>
<
a

href
=
“
#
“
>
其他
</
a
>
</
li
>

<
li

class
=
“
divider
“
>
</
li
>

<
li
>
<
a

href
=
“
#
“
>
分离的链接
</
a
>
</
li
>

</
ul
>

</
div
>


尝试一下 »

结果如下所示：

按钮下拉菜单的大小

您可以使用带有各种大小按钮的下拉菜单：.btn-lg、.btn-sm 或 .btn-xs。

实例

<
div

class
=
“
btn-group
“
>

<
button

type
=
“
button
“

class
=
“
btn btn-default dropdown-toggle btn-lg
“

data-toggle
=
“
dropdown
“
>
默认
<
span

class
=
“
caret
“
>
</
span
>

</
button
>

<
ul

class
=
“
dropdown-menu
“

role
=
“
menu
“
>

<
li
>

<
a

href
=
“
#
“
>
功能
</
a
>

</
li
>

<
li
>

<
a

href
=
“
#
“
>
另一个功能
</
a
>

</
li
>

<
li
>

<
a

href
=
“
#
“
>
其他
</
a
>

</
li
>

<
li

class
=
“
divider
“
>
</
li
>

<
li
>

<
a

href
=
“
#
“
>
分离的链接
</
a
>

</
li
>

</
ul
>

</
div
>

<
div

class
=
“
btn-group
“
>

<
button

type
=
“
button
“

class
=
“
btn btn-primary dropdown-toggle btn-sm
“

data-toggle
=
“
dropdown
“
>
原始
<
span

class
=
“
caret
“
>
</
span
>

</
button
>

<
ul

class
=
“
dropdown-menu
“

role
=
“
menu
“
>

<
li
>

<
a

href
=
“
#
“
>
功能
</
a
>

</
li
>

<
li
>

<
a

href
=
“
#
“
>
另一个功能
</
a
>

</
li
>

<
li
>

<
a

href
=
“
#
“
>
其他
</
a
>

</
li
>

<
li

class
=
“
divider
“
>
</
li
>

<
li
>

<
a

href
=
“
#
“
>
分离的链接
</
a
>

</
li
>

</
ul
>

</
div
>

<
div

class
=
“
btn-group
“
>

<
button

type
=
“
button
“

class
=
“
btn btn-success dropdown-toggle btn-xs
“

data-toggle
=
“
dropdown
“
>
成功
<
span

class
=
“
caret
“
>
</
span
>
</
button
>

<
ul

class
=
“
dropdown-menu
“

role
=
“
menu
“
>

<
li
>

<
a

href
=
“
#
“
>
功能
</
a
>

</
li
>

<
li
>

<
a

href
=
“
#
“
>
另一个功能
</
a
>

</
li
>

<
li
>

<
a

href
=
“
#
“
>
其他
</
a
>

</
li
>

<
li

class
=
“
divider
“
>
</
li
>

<
li
>

<
a

href
=
“
#
“
>
分离的链接
</
a
>

</
li
>

</
ul
>

</
div
>


尝试一下 »

结果如下所示：

按钮上拉菜单

菜单也可以往上拉伸的，只需要简单地向父 .btn-group 容器添加 .dropup 即可。

实例

<
div

class
=
“
row
“

style
=
“
margin-left:50px; margin-top:200px
“
>

<
div

class
=
“
btn-group dropup
“
>

<
button

type
=
“
button
“

class
=
“
btn btn-default dropdown-toggle
“

data-toggle
=
“
dropdown
“
>
默认
<
span

class
=
“
caret
“
>
</
span
>

</
button
>

<
ul

class
=
“
dropdown-menu
“

role
=
“
menu
“
>

<
li
>

<
a

href
=
“
#
“
>
功能
</
a
>

</
li
>

<
li
>

<
a

href
=
“
#
“
>
另一个功能
</
a
>

</
li
>

<
li
>

<
a

href
=
“
#
“
>
其他
</
a
>

</
li
>

<
li

class
=
“
divider
“
>
</
li
>

<
li
>

<
a

href
=
“
#
“
>
分离的链接
</
a
>

</
li
>

</
ul
>

</
div
>

<
div

class
=
“
btn-group dropup
“
>

<
button

type
=
“
button
“

class
=
“
btn btn-primary dropdown-toggle
“

data-toggle
=
“
dropdown
“
>
原始
<
span

class
=
“
caret
“
>
</
span
>

</
button
>

<
ul

class
=
“
dropdown-menu
“

role
=
“
menu
“
>

<
li
>

<
a

href
=
“
#
“
>
功能
</
a
>

</
li
>

<
li
>

<
a

href
=
“
#
“
>
另一个功能
</
a
>

</
li
>

<
li
>

<
a

href
=
“
#
“
>
其他
</
a
>

</
li
>

<
li

class
=
“
divider
“
>
</
li
>

<
li
>

<
a

href
=
“
#
“
>
分离的链接
</
a
>

</
li
>

</
ul
>

</
div
>

</
div
>


尝试一下 »

结果如下所示：