Yes, I understood that. That's why I said you can keep an unique ID
somewhere else, because the one created by data() can't be used:
//create an unique ID
var generateID = function(){
var uid = 0;
return function(){ return uid++ };
}
//save it somewhere
$('img').data('id',id)
or
$('img').attr('id','img'+id) //or in a custom attribute
Or instead, just make sure you are keeping at least one data pair per
element, like an empty placeholder.
And doh, now I realize that the code snippet is from jQuery itself :/
cheers,
- ricardo
On Dec 16, 7:35 pm, ricardoe <ricar...@gmail.com> wrote:
> Hi Ricardo
>
> Yeah, its a DOM element to be more specific I'm working with a lot of
> IMG elements.
> I need to identify them uniquely, (because sometimes the image is
> repeated, but I need to manage them as different objects), so when I
> read the documentation for jQuery.data() I (maybe mis-)understand that
> it will create a Unique id for an element, and its sort of true BUT
> don't you dare to use removeData() for that element because if you
> remove all the data attached with jQuery(elem).data('key','value') you
> will get rid of the unique-id for the element too. Does that make
> sense?
>
> On 16 dic, 10:33, Ricardo Tomasi <ricardob...@gmail.com> wrote:
>
> > You can keep your own unique identifier anywhere you want, for data()
> > the identifier is the element itself. If you care to explain a bit
> > more of what you're trying to achieve someone might come up with an
> > useful suggestion. What did 'elem' refer to in your original script
> > for example? A DOM element?
>
> > - ricardo
>
> > On Dec 16, 6:46 am, ricardoe <ricar...@gmail.com> wrote:
>
> > > Well, solved issue:
>
> > > Don't trust jQuery.data(element) if you're pretending to use gQuery
> > > (element).data('only-data-element','something')!!!!
> > > When you use gQuery(element).removeData('only-data-element') the
> > > jQuery.cache for that element will be deleted.
> > > This leads that when you do again jQuery.data(element) you WONT have
> > > the expected ID, it will create a new one.
>
> > > Why?! I dunno. But I'll not file a ticket cause "most of people
> > > doesn't use it that way"...... lame.
>
> > > On Dec 16, 1:39 am, ricardoe <ricar...@gmail.com> wrote:
>
> > > > Hi,
>
> > > > Does anyone knows why this:
>
> > > > var id = elem[ expando ];
> > > > // Compute a unique ID for the element
> > > > if ( !id ) {
> > > > id = elem[expando] = ++uuid;
> > > > }
>
> > > > Could be being broken? I mean, on a test page I made the elem[expando]
> > > > property is not being "saved".
> > > > I'll explain, the first time I do jQuery.data(element) I get a number
> > > > lets say: 10.
> > > > Then if I do again the same (with the exactly same element) I get: 14.
>
> > > > I'm using this to identify elements so its not working as expected,
> > > > anyone have theories about this?
