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Multiple Event Attachments...

April 28th, 2008 at 8:29 pm — Nick Husher (not verified)

One comment is that you're adding a memory overhead for each event listener you're attaching. For a half-dozen rollovers, this isn't a problem, but you could potentially be attaching several dozen of them.

In such a case, you'd want to attach one event listener on a parent element and check for individual cases by determining the target of the button click. So, for instance, something like the following:

var over = function(eventObject) {
    // get around IE's quirky DOM handling
    var target = (eventObject.target) ? eventObject.target : eventObject.srcElement
 
    if (YAHOO.util.Dom.hasClass(target, 'btn')) { 
        // it means we have a menu button
        YAHOO.util.Dom.addClass(target, 'btn-over');
    }
}
YAHOO.util.Event.on('menu', 'mouseover', over);

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