Hi Balage,
Your problem is this line:
button1.addListener("execute", this.__handleButton );
If the handler is called, "this" point to the button1 instance. To set
"this" to an other scope, use the third parameter. In your case:
button1.addListener("execute", this.__handleButton, this);
Cheers,
Chris
balage42-qoox...@yahoo.com schrieb:
>
> Hello!
>
> I try to use a member function as a callback for my P2P Ajax function.
> However, the function is always "undefined". Here is the relevant code
> of my application:
>
>
> --------------8<-------------------------------------------
>
> main : function()
> {
> [...]
> // Create a button
> var button1 = new qx.ui.form.Button("First Button",
> "edemo/test.png");
>
> // Document is the application root
> var doc = this.getRoot();
>
> // Add button to document at fixed coordinates
> doc.add(button1, {left: 120, top: 50});
>
> // Add an event listener
> console.log( 'HandlerDef: '+this.__handleButton );
> button1.addListener("execute", this.__handleButton );
> },
>
> __fillTable : function( pRequest ) {
> alert( pRequest );
> },
>
> __handleButton : function(e) {
> var hrq = new edemo.AjaxTools();
>
> console.log( 'Callback: '+this.__fillTable );
> hrq.sendXMLHTTPRequest( '<QD_FETCH_TEST/>', this.__fillTable,
> null, false );
> }
>
> --------------8<-------------------------------------------
>
> Here the "HandlerDef" trace prints the right method and it is
> successfully assigned to the event handler, OTOH, when calling it and
> tracing the "callback" function, it returns undefined.
>
> I am sure I missed some vital aspect of the OO framework, but can't
> see why doesn't sees the function? Or the this is "lost" (refers to
> another object) for a function when called as an event handler?
>
> Thanks,
> Balage
> ------------------------------------------------------------------------
>
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--
Christian Schmidt
Software Entwickler
1&1 Internet AG - Web Technologies
Ernst-Frey-Straße 9 · DE-76135 Karlsruhe
schmidt.christ...@1und1.de
Amtsgericht Montabaur / HRB 6484
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Gottschlich, Robert Hoffmann, Markus Huhn, Hans-Henning Kettler, Dr. Oliver
Mauss, Jan Oetjen
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