On Tue, Nov 25, 2008 at 9:43 PM, Derrell Lipman
<[EMAIL PROTECTED]> wrote:
> On Tue, Nov 25, 2008 at 4:50 PM, Patrick Paskvan <[EMAIL PROTECTED]>
> wrote:
>>
>> We could tie population of the select box on it's "click" event. The
>> handler would change just a bit (assigning vars sb and arr for
>> clarity):
>>
>> this._sb.addListener("click", this._fillBox, this);
>>
>> _fillBox : function (e)
>> {
>> var sb = e.getTarget();
>> var arr = this.getData();
>> for (var i=0; i<arr.length; i++)
>> {
>> sb.add(new qx.ui.form.ListItem(arr[i]));
>> }
>> }
>>
>> We can go that route. It's just not related to when the "data"
>> property of "sample.thing" is set. I was hoping (assuming) that the
>> select boxes could subscribe to the "changeData" event and get
>> notified and the handler would get all of the appropriate data in the
>> event object. Now I feel silly, but I thank you for pointing out my
>> bad assumption.
>
> If I'm following you correctly, you're looking for changes to the "data"
> property to be propagated to your (possibly multiple) SelectBoxes.
> Specifically, you'd do something like this:
>
> properties :
> {
> data :
> {
> check : "Array",
> init : null, // initialize this to an array in the constructor!
> apply : "_applyData"
> }
> },
>
> members :
> {
> _applyData : function(value, oldValue)
> {
> var selectBoxes = [ this._sb1, this._sb2 ];
> for (var i = 0; i < selectBoxes.length; i++)
> {
> selectBoxes[i].removeAll(); // or whatever method clears the list. I
> don't recall how it's done.
> for (j = 0; j < values.length; j++)
> {
> selectBoxes[i].add(new qx.ui.form.ListItem(values[j]);
> }
> }
> }
> }
Great, that's exactly what we were doing before I got on the wrong track.
> Note the comment about initializing the property in the constructor. If you
> have a property with an initial value that is a reference type (object,
> array) you'll end up SHARING that same array among all instances of the
> class. Very likely not what you want. So instead, you give it an initial
> value of null, and do this.setData([]) in your constructor so the instance
> gets its very own array for the property value.
>
Good tip. Haven't been bitten by that yet, but I'm sure you just
saved me a future afternoon.
Thanks again,
Pat
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