Matthew C wrote:
> I have some code that creates several observers for elements on a
> page. Due to my application logic, those elements may or may not be
> there. So I was wrapping them in conditional logic. To make that logic
> easier I implemented the following:
>
> Object.extend(Event, {
> observe_if_present: function(element,eventName,handler) {
> Object.isElement(element) ?
> Event.observe(element,eventName,handler) : false
> }
> })
>
> First of all, is this a good idea? Is there a better way to initialize
> observers for elements that may or may not exist?
>
> Thanks,
>
> Matt
Consider using $$() and invoke() or event delegation
(http://scripteka.com/script/element-delegate). See example below.
- Ken Snyder
// assign the class "modalPopup" to all elements that should popup a
modal window
$$('.modalPopup').invoke('observe', 'click', showModal);
// if no elements with that class exists, no observers will be attached
// similar example with event delegation so that there is only one observer
$('myPage').delegate('click', '.modalPopup', showModal);
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