Hi Kenny,
Kenneth Tilton wrote:
>
> Alexander Back wrote:
>> Hi Kenny,
>>
>> Kenneth Tilton wrote:
>>> I listen to "changeSelected" on a Tabview to keep track of who is in
>>> front. Works well except on app start-up, where it appears the initial
>>> "changeSelected" gets kicked off before the selected page's structure
>>> has been finalized.
>> I've just tested a tabView widget with several pages at the playground
>> and I get only one call of the event listener at startup and the rest is
>> working as expected.
>
> Yes, I only get one call on startup, but at that call the page returned
> by getSelected has two children (so I suspect the page returned by
> getData will be the same page and so I'll still see two children).
Yes, both return the same value - the selected tabview page.
> I'm OK, I just threw in a hack to always take the last child. :) But if
> "changeSelected" is being called before the widget is ready, folks may
> run into other problems eventually.
Yes, I also ran into that problem. The thing is that you have to add the
"changeSelected" listener *after* you added the pages.
--snip--
var tabView = new qx.ui.tabview.TabView;
var tabPage1 = new qx.ui.tabview.Page("Page1");
var tabPage2 = new qx.ui.tabview.Page("Page2");
tabView.add(tabPage1);
tabView.add(tabPage2);
tabPage1.setLayout(new qx.ui.layout.HBox);
tabPage1.add(new qx.ui.basic.Atom("Test"));
// Document is the application root
var doc = this.getRoot();
// Add button to document at fixed coordinates
doc.add(tabView,
{
left : 100,
top : 50
});
tabView.addListener("changeSelected", function(e){
console.debug(this.getChildren());
});
--snip--
If you add the listener right after you created the "tabView" widget
then the listener will be informed when a new page is added. Since no
page is existent at all this new page gets selected as default - and the
listener gets called. The second page will simply added withou being
selected and thus the listener is not called.
In short: If you want only monitor the changes of the user you have to
add the listener at last.
cheers,
Alex
>>> The logging/working listener code is this:
>>>
>>> tabView.addListener("changeSelected", function (e) {
>>> pg = tabView.getSelected();
>>> console.log("app tabview changesel PAGE " + pg );
>>> console.log("app tabview pg childs " + pg.getChildren());
>>> mod = pg.getChildren()[0];
>>> console.log("app tabview changesel PAGE child" + mod);
>>> console.log("app tabview changesel frontns now: "+ mod.ns);
>>>
>>> frontNS=mod.ns; // the real code
>>> })
>> If you use the "changeSelected" event you can use
>>
>> --snip--
>> tabView.addListener("changeSelected", function(e){
>> var selectedTabViewPage = e.getData();
>> });
>> --snip--
>>
>> the "getData()" method to access the currently selected tabView page
>> instance.
>>
>> cheers,
>> Alex
>>
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>>
>
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--
Alexander Back
Core Development::Webtechnologies
alexander.b...@1und1.de
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