您好我想知道当我点击下拉菜单时是否可以扩展引导导航栏？请
点击之前：
+------------------------------------------------+ | THE NAVBAR - dropdown menu \/ | +------------------------------------------------+点击后
：
+------------------------------------------------+ | THE NAVBAR - dropdown menu \/ | | submenu | +------------------------------------------------+
答案 0 :(得分：3)
This might be helpful as an example. It's relatively straight forward once you look into the CSS. There are also libraries like Yamm!3.
.navbar-default {
border-bottom: 4px solid #f00 !important;
background: #fff !important;
}
.navbar-default .navbar-nav > li > a,
.navbar-header a.navbar-brand {
color: #f00;
}
.navbar-default .navbar-nav > .dropdown > a .caret {
border-top-color: #f00;
border-bottom-color: #f00;
}
.menu-large {
position: static !important;
}
.megamenu {
padding: 20px 0px;
width: 100%;
}
.megamenu> li > ul {
padding: 0;
margin: 0;
}
.megamenu> li > ul > li {
list-style: none;
}
.megamenu> li > ul > li > a {
display: block;
padding: 3px 20px;
clear: both;
font-weight: normal;
line-height: 1.428571429;
color: #f00;
white-space: normal;
}
.megamenu> li ul > li > a:hover,
.megamenu> li ul > li > a:focus {
text-decoration: none;
color: #262626;
background-color: #f5f5f5;
}
.megamenu.dropdown-header {
color: #428bca;
font-size: 18px;
}
.megamenu img {
width: 100%;
height: 150px;
padding: 5px;
}
@media (max-width: 768px) {
.megamenu {
margin-left: 0;
margin-right: 0;
}
.megamenu> li {
margin-bottom: 30px;
}
.megamenu> li:last-child {
margin-bottom: 0;
}
.megamenu.dropdown-header {
padding: 3px 15px !important;
}
.navbar-nav .open .dropdown-menu .dropdown-header {
color: #fff;
}
}<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/js/bootstrap.min.js"></script>
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css" rel="stylesheet" />
<div class="navbar navbar-default navbar-static-top">
<div class="container">
<div class="navbar-header">
<button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-collapse"> <span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button> <a class="navbar-brand" href="#">Brand</a>
</div>
<div class="navbar-collapse collapse">
<ul class="nav navbar-nav navbar-right">
<li><a href="#">Home</a>
</li>
<li class="dropdown menu-large"> <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">Stuff <span class="caret"></span></a>
<ul class="dropdown-menu megamenu row ">
<li>
<div class="col-sm-6 col-md-3 ">
<a href="# " class="img-responsive ">
<img src="http://placehold.it/300/f00/fff" />
</a>
</div>
<div class="col-sm-6 col-md-3 ">
<a href="# " class="img-responsive ">
<img src="http://placehold.it/300/f00/fff" />
</a>
</div>
<div class="col-sm-6 col-md-3 ">
<a href="# " class="img-responsive ">
<img src="http://placehold.it/300/f00/fff" />
</a>
</div>
<div class="col-sm-6 col-md-3 ">
<a href="# " class="img-responsive ">
<img src="http://placehold.it/300/f00/fff" />
</a>
</div>
</li>
</ul>
</li>
<li class="dropdown menu-large "> <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">Things <span class="caret"></span></a>
<ul class="dropdown-menu megamenu row ">
<li class="col-sm-3 ">
<ul>
<li class="dropdown-header ">Item I Main</li>
<li><a href="# ">Item I Sub</a>
</li>
<li class="disabled "><a href="# ">Item II Sub</a>
</li>
<li><a href="# ">Item III Sub</a>
</li>
<li class="divider "></li>
<li class="dropdown-header ">Item II Main</li>
<li><a href="# ">Item I Sub</a>
</li>
<li><a href="# ">Item II Sub</a>
</li>
<li><a href="# ">Item III Sub</a>
</li>
<li><a href="# ">Item VI Sub</a>
</li>
</ul>
</li>
<li class="col-sm-3 ">
<ul>
<li class="dropdown-header ">Item III Main</li>
<li><a href="# ">Item I Sub</a>
</li>
<li><a href="# ">Item II Sub</a>
</li>
<li><a href="# ">Item III Sub</a>
</li>
<li><a href="# ">Item VI Sub</a>
</li>
<li><a href="# ">Item V Sub</a>
</li>
<li class="divider "></li>
<li class="dropdown-header ">Item IV Main</li>
<li><a href="# ">Item I Sub</a>
</li>
</ul>
</li>
<li class="col-sm-3 ">
<ul>
<li class="dropdown-header ">Item V Main</li>
<li><a href="# ">Item I Sub</a>
</li>
<li><a href="# ">Item II Sub</a>
</li>
<li><a href="# ">Item III Sub</a>
</li>
<li class="divider "></li>
<li class="dropdown-header ">Item VI Main</li>
<li><a href="# ">Item I Sub</a>
</li>
<li><a href="# ">Item II Sub</a>
</li>
<li><a href="# ">Item III Sub</a>
</li>
</ul>
</li>
<li class="col-sm-3 ">
<ul>
<li class="dropdown-header ">Item VII Main</li>
<li><a href="# ">Item I Sub</a>
</li>
<li><a href="# ">Item II Sub</a>
</li>
<li><a href="# ">Item III Sub</a>
</li>
<li><a href="# ">Item VI Sub</a>
</li>
<li><a href="# ">Item V Sub</a>
</li>
<li><a href="# ">Item VI Sub</a>
</li>
<li><a href="# ">Item VII Sub</a>
</li>
<li><a href="# ">Item VIII Subp</a>
</li>
<li><a href="# ">Item VIIII Sub</a>
</li>
</ul>
</li>
</ul>
</li>
</ul>
</div>
</div>
</div>答案 1 :(得分：2)
Try using bootstrap collapse like this:
.my-menu{
padding: 10px;
}
#collapse-menu{
margin-bottom: 0;
}<link href="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/css/bootstrap.min.css" rel="stylesheet"/>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
<script src="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/js/bootstrap.min.js"></script>
<nav class="navbar navbar-default my-nav-bar" role="navigation">
<a class="navbar-brand" href="#">Logotipo</a>
<div class="pull-right my-menu">
<button href="#" class="dropdown-toggle btn btn btn-primary" data-toggle="collapse" data-target="#collapse-menu"> <!--add the atributes data-toggle="collapse" data-target="#collapse-menu" to the element that you want to be the collapser-->
Dropdown Menu <b class="caret"></b>
</button>
<ul id="collapse-menu" class="list-group collapse"> <!--add the class "collapse" to the element that you want collapse-->
<li class="list-group-item"><a href="#">Acción #1</a></li>
<li class="list-group-item"><a href="#">Acción #2</a></li>
</ul>
</div>
</nav>