Bootstrap 3仍在RC中,但是我只是在尝试实现它。我不知道如何放置一个子菜单类。甚至CSS中没有类,甚至新文档也没有说什么
它在2.x中存在,类名称为dropdown-submenu
更新于2018
该dropdown-submenu自举3 RC已被删除。用Bootstrap作者Mark Otto的话来说。
dropdown-submenu
“子菜单现在在网络上没有什么位置,特别是在移动网络上。它们将在3.0中删除。”
但是,仅需一点额外的CSS,您就能获得相同的功能。
Bootstrap 4 (悬停时的导航栏子菜单)
.navbar-nav li:hover > ul.dropdown-menu { display: block; } .dropdown-submenu { position:relative; } .dropdown-submenu>.dropdown-menu { top:0; left:100%; margin-top:-6px; }
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 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:#cccccc; margin-top:5px; margin-right:-10px; } .dropdown-submenu:hover>a:after { border-left-color:#ffffff; } .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; }
样本标记
<div class="navbar navbar-default navbar-fixed-top" role="navigation"> <div class="container"> <div class="navbar-header"> <button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-ex1-collapse"> <span class="sr-only">Toggle navigation</span> <span class="icon-bar"></span> <span class="icon-bar"></span> <span class="icon-bar"></span> </button> </div> <div class="collapse navbar-collapse navbar-ex1-collapse"> <ul class="nav navbar-nav"> <li class="menu-item dropdown"> <a href="#" class="dropdown-toggle" data-toggle="dropdown">Drop Down<b class="caret"></b></a> <ul class="dropdown-menu"> <li class="menu-item dropdown dropdown-submenu"> <a href="#" class="dropdown-toggle" data-toggle="dropdown">Level 1</a> <ul class="dropdown-menu"> <li class="menu-item "> <a href="#">Link 1</a> </li> <li class="menu-item dropdown dropdown-submenu"> <a href="#" class="dropdown-toggle" data-toggle="dropdown">Level 2</a> <ul class="dropdown-menu"> <li> <a href="#">Link 3</a> </li> </ul> </li> </ul> </li> </ul> </li> </ul> </div> </div> </div>