Fixing Browser Incompatibilities in a CSS Drop-Down Menu - The modified version of the CSS-based drop-down menu
(Page 5 of 5 )
As I promised in the previous section, here's the full source code that corresponds to the drop-down menu, this time including all the modifications that you saw before:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<title>Example of CSS-based drop-down menu (cross-browser compatible)</title>
<style type="text/css">
/* reset body styles */
body{
padding: 0;
margin: 0;
background: #fff;
}
/* style unordered list */
ul{
padding: 0;
margin: 0;
list-style: none;
}
/* style menu items */
li{
float: left;
position: relative;
width: 10em;
}
/* position and hide drop-down menu */
li ul{
display: none;
position: absolute;
top: 1em;
left: 0;
}
li > ul{
top: auto;
left: auto;
}
/* display drop-down menu (add an 'over' class attribute to list items for IE */
li:hover ul,li.over ul{
display: block;
}
</style>
<script language="javascript">
function initializeDropDownMenu(){
// get 'navbar' element
var navbar=document.getElementById('navbar');
if(!navbar){return};
// get all menu items
var menuitems=navbar.getElementsByTagName('li');
if(!menuitems){return};
for(var i=0;i<menuitems.length;i++){
// assign 'over' class attribute to each menu item on 'mouseover'
menuitems[i].onmouseover=function(){
this.className+=' over';
}
// remove 'over' class attribute to each menu item on 'mouseout'
menuitems[i].onmouseout=function(){
this.className=this.className.replace(' over','');
}
}
}
// initialize drop-down menu when web page is loaded
window.onload=function(){
if(document.all&&document.getElementById&&document.getElementsByTagName){
initializeDropDownMenu();
}
}
</script>
</head>
<body>
<ul id="navbar">
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</body>
</html>
In addition, you may want to download all the supporting material for this drop-down menu here (link), so you can test it on your own browsers much more quickly and easily.
Final thoughts
In this second part of the series, I introduced some minor changes to the original version of this drop-down menu to make it compatible with Internet Explorer. Nonetheless, this educational journey hasn't finished yet, since in the last article of the series I'll show you how to make the menu look slightly more compelling to potential users.
Now that you've been warned, you won't want to miss it!
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