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：

基本的按钮下拉菜单

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：

分割的按钮下拉菜单

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：

按钮下拉菜单的大小

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：

按钮上拉菜单