导航栏多级下拉菜单hover展示
基于Bootstrap的dropdown-menu类实现的下拉菜单默认情况下需要鼠标点击才可以展开显示，显然不符合大部分需求，我们需要的是鼠标悬浮在对应的导航一级或二级或三级标题时，可以自动展示对应的子菜单。
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| <nav class="navbar-collapse panel-collapse" id="navbar-main">
<ul class="nav navbar-nav navbar-right">
<li class="dropdown show-on-hover">
<a class="dropdown-toggle" data-toggle="dropdown" href="index.html#">自助编辑<i class="fa fa-edit fa-fw"></i></a>
<ul class="dropdown-menu">
<li class="dropdown-submenu show-on-hover">
<a class="dropdown-toggle" data-toggle="dropdown" href="destination-parent.html">Africa</a>
<ul class="dropdown-menu">
<li><a href="#">Algeria</a></li>
<li><a href="#">Cape Verde</a></li>
</ul>
</li>
<li class="dropdown-submenu show-on-hover">
<a class="dropdown-toggle" data-toggle="dropdown" href="destination-parent.html">Asia</a>
<ul class="dropdown-menu">
<li><a href="#">Bhutan</a></li>
<li><a href="#">Cambodia</a></li>
<li><a href="#">Vietnam</a></li>
</ul>
</li>
<li class="divider"></li>
<li class="dropdown-submenu show-on-hovered">
<a class="dropdown-toggle" data-toggle="dropdown" href="destination-parent.html">Canada</a>
<ul class="dropdown-menu">
<li><a href="#">Alberta</a></li>
<li><a href="#">Vancouver</a></li>
</ul>
</li>
<li class="dropdown-submenu show-on-hover">
<a class="dropdown-toggle" data-toggle="dropdown" href="destination-parent.html">Central America </a>
<ul class="dropdown-menu">
<li><a href="#">Honduras</a></li>
<li><a href="#">Nicaragua</a></li>
<li><a href="#">Panama</a></li>
</ul>
</li>
<li class="divider"></li>
<li class="dropdown-submenu show-on-hover">
<a class="dropdown-toggle" data-toggle="dropdown" href="destination-parent.html">Europe</a>
<ul class="dropdown-menu">
<li><a href="#">Spain</a></li>
<li><a href="#">Ukraine</a></li>
<li><a href="#">United Kingdom</a></li>
</ul>
</li>
<li class="dropdown-submenu show-on-hover">
<a class="dropdown-toggle" data-toggle="dropdown" href="destination-parent.html">United States</a>
<ul class="dropdown-menu">
<li><a href="#">New York</a></li>
<li><a href="#">Nevada</a></li>
<li><a href="#">Texas</a></li>
</ul>
</li>
</ul>
</li>
<li class="dropdown show-on-hover">
<a class="dropdown-toggle" data-toggle="dropdown" href="index.html#">内容补充</a>
<ul class="dropdown-menu">
<li><a href="#">Adventure <i class="fa fa-pencil-square fa-fw"></i></a></li>
<li><a href="#">Beaches</a></li>
<li><a href="#">Culture & History</a></li>
</ul>
</li>
<li><a href="#">权限申请</a></li>
<li><a href="#">Others</a></li>
</ul>
</nav>
|
默认需要点击才可以展开下拉菜单：
JS实现
通过本来就引入的库jQuery实现
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|
$('.nav .dropdown').mouseenter(function() {
console.log("一级菜单展开了");
$(this).addClass('open');
});
$('.nav .dropdown').mouseleave(function() {
console.log("一级菜单离开了");
$(this).removeClass('open');
});
$('.nav .dropdown .dropdown-submenu').mouseenter(function() {
console.log("二级菜单dropdown-submenu展开了");
$(this).addClass('open');
});
$('.nav .dropdown .dropdown-submenu').mouseleave(function() {
console.log("二级菜单dropdown-submenu离开了");
$(this).removeClass('open');
});
|
CSS实现
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| .navbar .nav>li .dropdown-menu {
margin: 0;
}
.nav.navbar-nav.navbar-right>li:hover>.dropdown-menu {
display: block;
}
.nav.navbar-nav.navbar-right ul.dropdown-menu>li.dropdown-submenu .dropdown-toggle:hover+.dropdown-menu {
display: inline-table;
}
|
