Bootstrap 下拉菜單（Dropdowns）

本章將重點(diǎn)介紹 Bootstrap 下拉菜單。下拉菜單是可切換的，是以列表格式顯示鏈接的上下文菜單。這可以通過(guò)與 下拉菜單（Dropdown） JavaScript 插件 的互動(dòng)來(lái)實(shí)現(xiàn)。

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如需使用下拉菜單，只需要在 class .dropdown 內(nèi)加上下拉菜單即可。下面的實(shí)例演示了基本的下拉菜單：

實(shí)例

<
div

class
=
"
dropdown
"
>

<
button

type
=
"
button
"

class
=
"
btn dropdown-toggle
"

id
=
"
dropdownMenu1
"

data-toggle
=
"
dropdown
"
>
主題
<
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
=
"
#
"
>
數(shù)據(jù)挖掘
a
>

li
>

<
li

role
=
"
presentation
"
>

<
a

role
=
"
menuitem
"

tabindex
=
"
-1
"

href
=
"
#
"
>
數(shù)據(jù)通信/網(wǎng)絡(luò)
a
>

li
>

<
li

role
=
"
presentation
"

class
=
"
divider
"
>
li
>

<
li

role
=
"
presentation
"
>

<
a

role
=
"
menuitem
"

tabindex
=
"
-1
"

href
=
"
#
"
>
分離的鏈接
a
>

li
>

ul
>

div
>

嘗試一下 ?

結(jié)果如下所示：

選項(xiàng)

對(duì)齊

通過(guò)向 .dropdown-menu 添加 class .pull-right 來(lái)向右對(duì)齊下拉菜單。下面的實(shí)例演示了這點(diǎn)：

實(shí)例

<
div

class
=
"
dropdown
"
>

<
button

type
=
"
button
"

class
=
"
btn dropdown-toggle
"

id
=
"
dropdownMenu1
"

data-toggle
=
"
dropdown
"
>
主題
<
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
=
"
#
"
>
數(shù)據(jù)挖掘
a
>

li
>

<
li

role
=
"
presentation
"
>

<
a

role
=
"
menuitem
"

tabindex
=
"
-1
"

href
=
"
#
"
>
數(shù)據(jù)通信/網(wǎng)絡(luò)
a
>

li
>

<
li

role
=
"
presentation
"

class
=
"
divider
"
>
li
>

<
li

role
=
"
presentation
"
>

<
a

role
=
"
menuitem
"

tabindex
=
"
-1
"

href
=
"
#
"
>
分離的鏈接
a
>

li
>

ul
>

div
>

嘗試一下 ?

結(jié)果如下所示：

標(biāo)題

您可以使用 class dropdown-header 向下拉菜單的標(biāo)簽區(qū)域添加標(biāo)題。下面的實(shí)例演示了這點(diǎn)：

實(shí)例

<
div

class
=
"
dropdown
"
>

<
button

type
=
"
button
"

class
=
"
btn dropdown-toggle
"

id
=
"
dropdownMenu1
"

data-toggle
=
"
dropdown
"
>
主題
<
span

class
=
"
caret
"
>
span
>

button
>

<
ul

class
=
"
dropdown-menu
"

role
=
"
menu
"

aria-labelledby
=
"
dropdownMenu1
"
>

<
li

role
=
"
presentation
"

class
=
"
dropdown-header
"
>
下拉菜單標(biāo)題
li
>

<
li

role
=
"
presentation
"
>

<
a

role
=
"
menuitem
"

tabindex
=
"
-1
"

href
=
"
#
"
>
Java
a
>

li
>

<
li

role
=
"
presentation
"
>

<
a

role
=
"
menuitem
"

tabindex
=
"
-1
"

href
=
"
#
"
>
數(shù)據(jù)挖掘
a
>

li
>

<
li

role
=
"
presentation
"
>

<
a

role
=
"
menuitem
"

tabindex
=
"
-1
"

href
=
"
#
"
>
數(shù)據(jù)通信/網(wǎng)絡(luò)
a
>

li
>

<
li

role
=
"
presentation
"

class
=
"
divider
"
>
li
>

<
li

role
=
"
presentation
"

class
=
"
dropdown-header
"
>
下拉菜單標(biāo)題
li
>

<
li

role
=
"
presentation
"
>

<
a

role
=
"
menuitem
"

tabindex
=
"
-1
"

href
=
"
#
"
>
分離的鏈接
a
>

li
>

ul
>

div
>

嘗試一下 ?

結(jié)果如下所示：

---

更多實(shí)例

類(lèi)	描述	實(shí)例
.dropdown	指定下拉菜單，下拉菜單都包裹在 .dropdown 里	嘗試一下
.dropdown-menu	創(chuàng)建下拉菜單	嘗試一下
.dropdown-menu-right	下拉菜單右對(duì)齊	嘗試一下
.dropdown-header	下拉菜單中添加標(biāo)題	嘗試一下
.dropup	指定向上彈出的下拉菜單	嘗試一下
.disabled	下拉菜單中的禁用項(xiàng)	嘗試一下
.divider	下拉菜單中的分割線	嘗試一下

本文題目：創(chuàng)新互聯(lián)Bootstrap教程：Bootstrap下拉菜單（Dropdowns）
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