What I prefer to do is to add a single persistent observer to an
element that won't be destroyed during the life of the page, and then
delegate listening to that element. So if I had a list of things that
I wanted to observe, and one of the things I was doing was adding or
deleting those list items, what I would do is observe the UL that
holds them, since most events would bubble up from the children
(except certain form element events, like onChange).
<ul id="list">
<li id="elm_1">Element 1 <span class="delete">-</span></li>
... many more elements, all with similar structure
</ul>
$('list').observe('click',function(evt){
var elm = evt.findElement('span.delete');
if(elm){
var id = elm.id.split(/_/).last();
new Ajax.Request('delete.php',{
parameters:{'id',id},
onSuccess:function(transport){
elm.up('li').remove();
}
});
}
});
Obviously, you can handle many more elements and events inside the
same basic observer. If you like, you can use var elm = evt.element();
and then a switch statement to work out what the type of element
instigated the event and branch your logic that way.
Walter
On May 10, 2010, at 3:39 PM, Junkshops wrote:
Hi all,
I'm wondering what the appropriate thing to do is wrt event listeners
on elements that get replaced by an Ajax.Updater call or something
similar. It seems like a giant pain to have to run through all the sub
elements of the container you're updating and remove all the listeners
for every piece of AJAX on the site, but on the other hand I assume
that if you don't, you wind up with a memory leak since you accumulate
listeners on non-existent events.
Thanks in advance.
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