Hi Michael,
i will forward you mail to our DataBinding expert.
He will be back to office next week.
Greetz Christopher
Am 14.08.2013 um 17:47 schrieb Michael Elsdörfer:
> I've been known to use code like this:
>
> calendarsController.bind('selection[0]', entriesList, 'model', {
> converter: function(calendar) {
> if (calendar == null)
> return null;
> return new load_calendar(calendar.getId());
> }
>
> I.e. use the databinding converter to trigger an Ajax request to the
> server. This seemed preferable to me, because
>
> calendarsController.getSelection().addListener('change', ...
>
> will not work if the selection array has a whole is replaced (and you
> end up needing to do things like these:
>
> var selection = this.tree.getController().getSelection();
> selection.splice(0, selection.length, newSelectedItem);
>
> to replace a selection in one step.
>
> (If I'm missing something here with regards to changing a selection
> array I'd love to know).
>
> The problem with the code above is that the converter *always* triggers
> twice. This is because of the code in MSelection.js:
>
> ...
> // use splice to ensure a correct change event [BUG #4728]
> selection.splice.apply(selection, spliceArgs).dispose();
>
> // fire the change event manually
> this.fireDataEvent("changeSelection", this.getSelection());
>
> I.e., the binding first triggers via the "no-op" splice, then is
> triggered again manually.
>
> Now this is inacceptable in my case where data is loaded from the
> server, but I image there are other cases where you wouldn't want this
> to happen, and in general it doesn't seem like good design.
>
> Any thoughts? Can this be changed?
>
> Michael
>
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