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Posted by Duncan Booth on 10/22/05 20:47
windandwaves wrote:
><body onload="hoverer('menu');">
>
> function hoverer(ulname) {
> if (document.all && document.getElementById(ulname).currentStyle ) {
> var navroot = document.getElementById(ulname);
> var lis=navroot.getElementsByTagName("li");
> for (i=0; i<lis.length; i++) {
> var oldClassName = this.className;
> lis[i].onmouseover=function() {this.className = ulname + "ie";}
> lis[i].onmouseout=function() {this.className = oldClassName;}
> }
> }
> }
>
> any comments / questions greatly appreciated.
You could avoid multiple calls of getElementById by moving the declaration
of navroot outside the if statement.
You shouldn't use a global variable as the loop counter. This is likely to
lead to subtle errors.
The line 'var oldClassName = this.className' is a loop invariant, so you
might as well move it outside the loop. The functions you define don't vary
either, so those can be moved out as well.
The onmouseout function is setting the li element's classname to the body's
classname which probably isn't what you intended.
A better way to do this is to use the fact that an element can have
multiple classes. e.g.
function hoverer(ulname) {
function mouseOver() {
this.className += ' hover';
}
function mouseOut() {
this.className = this.className.replace(/ *hover\b/g, '');
}
var navroot = document.getElementById &&
document.getElementById(ulname);
if (document.all && navroot && navroot.currentStyle ) {
var navroot = document.getElementById(ulname);
var lis=navroot.getElementsByTagName("li");
for (var i=0; i<lis.length; i++) {
lis[i].onmouseover=mouseOver;
lis[i].onmouseout=mouseOut;
}
}
}
Then your style rules can do things like:
#menu li.hover, #menu li:hover {
background-color: #123456;
}
One other point to consider is that you might want to attach other
mouse over/mouse out event handlers directly to list elements, so it might
be better to use the 'attachEvent' method to add an additional handler and
not interfere with existing handlers. If you do this though it gets a bit
more complicated as you can't just use 'this' to access the list element.
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