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在bootstrap官方來說，導航最多就是兩級，兩級以上是無法實現的，大叔找了一些第三方的資料，終於找到一個不錯的插件，使用上和效果上都還不錯，現在和大家分享一下

插件地址：http://vsn4ik.github.io/bootstrap-submenu/

先看一下，在後台系統上的顯示效果

下面說一下實現的方式

１.引用三個JS插件和一個CSS類庫

<script src="~/Content/bootstraps/JS/bootstrap-submenu.js"></script>
<script src="~/Content/bootstraps/JS/highlight.min.js"></script>
<script src="~/Content/bootstraps/JS/docs.js"></script>
<link href="~/Content/bootstraps/CSS/bootstrap-submenu.css" rel="stylesheet" /> 

２.插入對應的HTML代碼塊,本例子沒有使用遞歸生成代碼，使用了靜態的三級結構，這樣看著更清晰，真正的生產環境建議使用遞歸去生產菜單

<ul class="nav nav-pills">
@foreach (var item in Model)
{
if (item.Sons != null && item.Sons.Count > 0)
{
<li class="dropdown">
<a data-submenu="" data-toggle="dropdown" tabindex="0">@item.MenuName<span class="caret"></span></a>
<ul class="dropdown-menu">
@foreach (var sub in item.Sons)
{
if (sub.Sons != null && item.Sons.Count > 0)
{
<li class="dropdown-submenu">
<a tabindex="0">@sub.MenuName</a>
<ul class="dropdown-menu">
@foreach (var inner in sub.Sons)
{
<li>
<a href="@inner.LinkUrl">@inner.MenuName</a>
</li>
}
</ul>
</li>
<li class="divider"></li>
}
else
{
<li><a href="@sub.LinkUrl">@sub.MenuName</a></li>
}
}
</ul>
</li>
}
else
{
<li><a href="@item.LinkUrl">@item.MenuName</a></li>
}
}
</ul> 

最後的效果就是第一個圖了，值得注意的是，如果希望每個菜單之間使用分割線，可以添加 <li class="divider"></li>這行代碼。

下面給大家推薦一段代碼有關Bootstrap多級級聯菜單

<div class="navbar navbar-fixed-top">
<div class="navbar-inner">
<div class="container-fluid">
<a data-target=".nav-collapse" data-toggle="collapse" class="btn btn-navbar">
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</a>
<a href="#" class="brand">Project name</a>
<div class="nav-collapse">
<ul class="nav">
<li class="active">
<a href="#">Home</a>
</li>
<li>
<a href="#">Link</a>
</li>
<li>
<a href="#">Link</a>
</li>
<li>
<a href="#">Link</a>
</li>
<li class="dropdown">
<a data-toggle="dropdown" class="dropdown-toggle" href="#">
Dropdown
<b class="caret"></b>
</a>
<ul class="dropdown-menu">
<li class="dropdown-submenu">
<a href="#">More options</a>
<ul class="dropdown-menu">
<li>
<a href="#">Second level link</a>
</li>
<li>
<a href="#">Second level link</a>
</li>
<li>
<a href="#">Second level link</a>
</li>
<li>
<a href="#">Second level link</a>
</li>
<li class="dropdown-submenu">
<a href="#">Second level link</a>
<ul class="dropdown-menu">
<li>
<a href="#">3333333333</a>
</li>
</ul>
</li>
</ul>
</li>
<li>
<a href="#">Another action</a>
</li>
<li>
<a href="#">Something else here</a>
</li>
<li class="divider"></li>
<li class="nav-header">Nav header</li>
<li>
<a href="#">Separated link</a>
</li>
<li>
<a href="#">One more separated link</a>
</li>
</ul>
</li>
</ul>
<form action="" class="navbar-search pull-left">
<input type="text" placeholder="Search" class="search-query span2">
</form>
<ul class="nav pull-right">
<li>
<a href="#">Link</a>
</li>
<li class="divider-vertical"></li>
<li class="dropdown">
<a class="#" href="#">Menu</a>
</li>
</ul>
</div><!-- /.nav-collapse -->
</div>
</div>
</div>
<hr />
<ul class="nav nav-pills">
<li class="active">
<a href="#">Regular link</a>
</li>
<li class="dropdown">
<a href="#" data-toggle="dropdown" class="dropdown-toggle">
Dropdown
<b class="caret"></b>
</a>
<ul class="dropdown-menu" id="menu1">
<li class="dropdown-submenu">
<a href="#">More options</a>
<ul class="dropdown-menu">
<li>
<a href="#">Second level link</a>
</li>
<li>
<a href="#">Second level link</a>
</li>
<li>
<a href="#">Second level link</a>
</li>
<li>
<a href="#">Second level link</a>
</li>
<li>
<a href="#">Second level link</a>
</li>
</ul>
</li>
<li>
<a href="#">Another action</a>
</li>
<li>
<a href="#">Something else here</a>
</li>
<li class="divider"></li>
<li>
<a href="#">Separated link</a>
</li>
</ul>
</li>
<li class="dropdown">
<a href="#">Menu</a>
</li>
<li class="dropdown">
<a href="#">Menu</a>
</li>
</ul>

以上所述是小編給大家介紹的Bootstrap多級導航欄(級聯導航)的實現代碼，希望對大家有所幫助！