本文实例为大家分享了Bootstrap实现下拉菜单多级联动的具体代码，供大家参考，具体内容如下
<!DOCTYPE HTML>
<html lang=\"zh-CN\">
<head>
<meta charset=\"UTF-8\">
<title>Bootstrap 3 的多级下拉菜单示例</title>
<script type=\"text/javascript\" src=\"http://libs.baidu.com/jquery/1.9.0/jquery.js\"></script>
<link rel=\"stylesheet\" href=\"http://libs.baidu.com/bootstrap/3.0.3/css/bootstrap.min.css\" rel=\"external nofollow\" />
<script type=\"text/javascript\" src=\"http://libs.baidu.com/bootstrap/3.0.3/js/bootstrap.min.js\"></script>
<style type=\"text/css\">
.dropdown-submenu {
position: relative;
}
.dropdown-submenu > .dropdown-menu {
top: 0;
left: 100%;
margin-top: -6px;
margin-left: -1px;
-webkit-border-radius: 0 6px 6px 6px;
-moz-border-radius: 0 6px 6px;
border-radius: 0 6px 6px 6px;
}
.dropdown-submenu:hover > .dropdown-menu {
display: block;
}
.dropdown-submenu > a:after {
display: block;
content: \" \";
float: right;
width: 0;
height: 0;
border-color: transparent;
border-style: solid;
border-width: 5px 0 5px 5px;
border-left-color: #ccc;
margin-top: 5px;
margin-right: -10px;
}
.dropdown-submenu:hover > a:after {
border-left-color: #fff;
}
.dropdown-submenu.pull-left {
float: none;
}
.dropdown-submenu.pull-left > .dropdown-menu {
left: -100%;
margin-left: 10px;
-webkit-border-radius: 6px 0 6px 6px;
-moz-border-radius: 6px 0 6px 6px;
border-radius: 6px 0 6px 6px;
}
</style>
</head>
<body>
<div class=\"container\">
<div class=\"row\">
<div class=\"form-group\">
<input type=\"hidden\" name=\"category_id\" id=\"category_id\" value=\"\" />
<div class=\"dropdown\">
<a id=\"dLabel\" role=\"button\" data-toggle=\"dropdown\" class=\"btn btn-white\" data-target=\"#\" href=\"javascript:;\" rel=\"external nofollow\" rel=\"external nofollow\" rel=\"external nofollow\" rel=\"external nofollow\" rel=\"external nofollow\" rel=\"external nofollow\" rel=\"external nofollow\" rel=\"external nofollow\" ><span id=\"select-title\">选择分类</span> <span class=\"caret\"></span></a>
<ul class=\"dropdown-menu multi-level\" role=\"menu\" aria-labelledby=\"dropdownMenu\">
<li><a href=\"javascript:;\" rel=\"external nofollow\" rel=\"external nofollow\" rel=\"external nofollow\" rel=\"external nofollow\" rel=\"external nofollow\" rel=\"external nofollow\" rel=\"external nofollow\" rel=\"external nofollow\" data-index=\"1\" data-title=\"一级菜单\">一级菜单</a></li>
<li class=\"dropdown-submenu\">
<a href=\"javascript:;\" rel=\"external nofollow\" rel=\"external nofollow\" rel=\"external nofollow\" rel=\"external nofollow\" rel=\"external nofollow\" rel=\"external nofollow\" rel=\"external nofollow\" rel=\"external nofollow\" data-index=\"2\" data-title=\"一级菜单\">一级菜单</a>
<ul class=\"dropdown-menu\">
<li><a data-index=\"2-1\" href=\"javascript:;\" rel=\"external nofollow\" rel=\"external nofollow\" rel=\"external nofollow\" rel=\"external nofollow\" rel=\"external nofollow\" rel=\"external nofollow\" rel=\"external nofollow\" rel=\"external nofollow\" data-title=\"二级菜单\">二级菜单</a></li>
</ul>
</li>
<li class=\"dropdown-submenu\">
<a tabindex=\"3\" href=\"javascript:;\" rel=\"external nofollow\" rel=\"external nofollow\" rel=\"external nofollow\" rel=\"external nofollow\" rel=\"external nofollow\" rel=\"external nofollow\" rel=\"external nofollow\" rel=\"external nofollow\" data-title=\"一级菜单\">一级菜单</a>
<ul class=\"dropdown-menu\">
<li><a tabindex=\"3-1\" href=\"javascript:;\" rel=\"external nofollow\" rel=\"external nofollow\" rel=\"external nofollow\" rel=\"external nofollow\" rel=\"external nofollow\" rel=\"external nofollow\" rel=\"external nofollow\" rel=\"external nofollow\" data-title=\"二级菜单\">二级菜单</a></li>
<li class=\"divider\"></li>
<li class=\"dropdown-submenu\">
<a href=\"javascript:;\" rel=\"external nofollow\" rel=\"external nofollow\" rel=\"external nofollow\" rel=\"external nofollow\" rel=\"external nofollow\" rel=\"external nofollow\" rel=\"external nofollow\" rel=\"external nofollow\" data-index=\"3-2\" data-title=\"二级菜单\">二级菜单</a>
<ul class=\"dropdown-menu\">
<li><a href=\"javascript:;\" rel=\"external nofollow\" rel=\"external nofollow\" rel=\"external nofollow\" rel=\"external nofollow\" rel=\"external nofollow\" rel=\"external nofollow\" rel=\"external nofollow\" rel=\"external nofollow\" data-index=\"3-2-1\" data-title=\"三级菜单\">三级菜单</a></li>
</ul>
</li>
</ul>
</li>
</ul>
</div>
</div>
</div>
</div>
</body>
</html>
<script type=\"text/javascript\">
$(\'.dropdown li a\').click(function(){
console.log(this);
title = $(this).attr(\"data-title\");
id = $(this).attr(\"data-index\");
$(\"#select-title\").text(title);
$(\"#category_id\").val(id);
})
</script>
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