Primero
el producto terminado.
La librería jquery la pueden agregar al javascript de ésta forma en la sección <head>:
<script type="text/javascript"
src="http://ajax.googleapis.com/ajax/libs/jquery/1.4/jquery.min.js">
</script>
Primero un poco de HTML de ejemplo:
<ul class="topnav">
<li><a href="#">Home</a></li>
<li>
<a href="#">Tutorials</a>
<ul class="subnav">
<li><a href="#">Sub Nav Link</a></li>
<li><a href="#">Sub Nav Link</a></li>
</ul>
</li>
<li>
<a href="#">Resources</a>
<ul class="subnav">
<li><a href="#">Sub Nav Link</a></li>
<li><a href="#">Sub Nav Link</a></li>
</ul>
</li>
<li><a href="#">About Us</a></li>
<li><a href="#">Advertise</a></li>
<li><a href="#">Submit</a></li>
<li><a href="#">Contact Us</a></li>
</ul>
Luego el CSS:
ul.topnav {
list-style: none;
padding: 0 20px;
margin: 0;
float: left;
width: 920px;
background: #222;
font-size: 1.2em;
background: #002244;
}
ul.topnav li {
float: left;
margin: 0;
padding: 0 15px 0 0;
position: relative; /*--Declare X and Y axis base for sub navigation--*/
}
ul.topnav li a{
padding: 10px 5px;
color: #fff;
display: block;
text-decoration: none;
float: left;
}
ul.topnav li a:hover{
background: #003366;
}
ul.topnav li span { /*--Drop down trigger styles--*/
width: 17px;
height: 42px;
float: left;
background: #333333 url("drop_down_arrow.gif") 0 10px no-repeat;
}
ul.topnav li span.subhover {cursor: pointer;} /*--Hover effect for trigger--*/
ul.topnav li ul.subnav {
list-style: none;
position: absolute; /*--Important - Keeps subnav from affecting main navigation flow--*/
left: 0; top: 35px;
background: #333;
margin: 0; padding: 0;
display: none;
float: left;
width: 170px;
border: 1px solid #111;
}
ul.topnav li ul.subnav li{
margin: 0; padding: 0;
border-top: 1px solid #252525; /*--Create bevel effect--*/
border-bottom: 1px solid #444; /*--Create bevel effect--*/
clear: both;
width: 170px;
}
html ul.topnav li ul.subnav li a {
float: left;
width: 145px;
background: #333;
padding-left: 20px;
}
html ul.topnav li ul.subnav li a:hover { /*--Hover effect for subnav links--*/
background: #222;
}
Finalmente un poco de jQuery:
$(document).ready(function(){
$("ul.subnav").parent().append("<span></span>"); //Only shows drop down trigger when js is enabled (Adds empty span tag after ul.subnav*)
$("ul.topnav li span").click(function() { //When trigger is clicked...
//Following events are applied to the subnav itself (moving subnav up and down)
$(this).parent().find("ul.subnav").slideDown('fast').show(); //Drop down the subnav on click
$(this).parent().hover(function() {
}, function(){
$(this).parent().find("ul.subnav").slideUp('slow'); //When the mouse hovers out of the subnav, move it back up
});
//Following events are applied to the trigger (Hover events for the trigger)
}).hover(function() {
$(this).addClass("subhover"); //On hover over, add class "subhover"
}, function(){ //On Hover Out
$(this).removeClass("subhover"); //On hover out, remove class "subhover"
});
});
