RE: which is faster target.getElementsByTagName or target.firstChild / nextSibling

You could try calling these functions in a loop 1000 times and measuring the
time to execute the loop.  This way you have a test that can you can run on
each browser you intend to support.

moran

> -----Original Message-----
> From: [email protected] [mailto:[email protected]] On Behalf
> Of becs027
> Sent: Thursday, April 06, 2006 7:44 PM
> To: [email protected]
> Subject: [wdf-dom] which is faster target.getElementsByTagName or
> target.firstChild / nextSibling
> 
> Hi all,
> 
> I'm doing an onload script to add rollover behaviour to list items
> (dropdown menu style) for IE, and want to check which of two ways is
> faster.
> 
> ------------------------------------------------
> 
> Option 1 - add the behaviour using target.getElementsByTagName:
> 
> if (document.getElementById('navigation')) {
> 	    var target = document.getElementById('navigation');
> 	    var targetbuttons = target.getElementsByTagName('li');
> 
> 	    for (var i = 0; i < targetbuttons.length; i++) {
> 		targetbuttons[i].onmouseover = rollover;
> 		targetbuttons[i].onmouseout = rolloff;
>             }
> 	}
> 
> ------------------------------------------------
> 
> Option 2 - add the behaviour with a while loop using firstChild,
> nextSibling:
> 
> if (document.getElementById('navigation')) {
>                 var target = document.getElementById('navigation');
>                 var targetbutton = target.firstChild;
> 
>                 while (targetbutton) {
>                     targetbutton.onmouseover = rollover;
>                     targetbutton.onmouseout = rolloff;
>                     targetbutton = targetbutton.nextSibling;
>                 }
>             }
> 
> ------------------------------------------------
> 
> Thanks :)
> Rebecca
> 
> 
> 
> 
> 
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