Thanks John, that makes complete sense, I too am not sure why jQuery
UI doesn't use a counter either.
In my own code I have a plugin that generates an id if one is not
already present on an element:
(function($) {
var prefix = 'id' + (+new Date()) + '-', count = 0;
// Get the id of an element, or generate a unique id if it lacks one
$.id = function( elem ) {
if ( !elem.id ) {
elem.id = prefix+(++count);
}
return elem.id;
};
// Returns a space separated list of the id's of the elements
$.fn.idrefs = function() {
return Array.prototype.join.call($(this).map(function() { return
$.id(this); }), ' ');
};
})(jQuery);
Maybe something along these lines would be useful in the core as a
clear and standard alternative to $.data(elem)
- Mark
2009/10/14 John Resig <jere...@gmail.com>:
>
> Hi Mark -
>
> This was intentional. We could no longer guarantee that an ID would be
> attached for an element at all times (which is what was done before).
> Additionally calling that method would attach an expando and object to
> an empty element - even if no data needed to be stored (which is bad).
> Almost universally the use of $.data(elem) was used to get at the
> entirety of an element's data collection - which is what is now
> returned from $.data(elem) instead.
>
> Looking at the tabs code it looks like they're using it to generate a
> unique ID (but it's not clear as to why they need $.data for this -
> they could, just as easily, keep a global ID counter and assign it to
> the element if it doesn't have one, already. There's no need to attach
> an entire data object just to get at that information.
>
> As it stands the next version of jQuery UI will require jQuery 1.4 so
> this is definitely one place where we could make that clean break. If
> it does become problematic, though (especially for other plugins),
> then we could look into ways of changing it.
>
> --John
>
>
>
> On Wed, Oct 14, 2009 at 10:24 AM, Mark Gibson <jollyt...@gmail.com> wrote:
>>
>> Hi, I've noticed that the behaviour of $.data() has changed in 1.4pre,
>>
>> $.data(elem) no longer returns the cache id, it returns all the data
>> items or null.
>> this will probably break a lot of code (already breaks jQuery UI Tabs)
>>
>> Is this intentional, or a bug?
>>
>> - Mark.
>>
>> >
>>
>
> >
>
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