oh .. got it now. ive never done async-stuff, so i must rethink as u said. ;)
actually im not a webapp-programmer, its not hard but different than
programming a game or demo. no back to topic ;)
my approach:
var rpc = new qxgui.utils.Rpc;
rpc.callAsync( "getMenuXml", null );
rpc.addListener( "completed", function(e)
{
qxgui.reg.MenuXML.getInstance().setMenu( e.getData() );
});
for some reason the listener doesnt react.
any suggestions?
ps: i appreciate the great support in this mailing list!
regards
Andreas
Derrell Lipman wrote:
>
> On Wed, May 6, 2009 at 9:24 AM, sNIk <[email protected]> wrote:
>
>>
>> hello. at first the code ...
>>
>> qx.Class.define("qxgui.reg.MenuXML",
>> {
>> extend: qx.core.Object,
>> type: "singleton",
>>
>> construct: function()
>> {
>> var rpc = new qxgui.utils.Rpc;
>>
>> rpc.callAsync( "getMenuXml", null, function( result )
>> {
>> qxgui.reg.MenuXML.getInstance().setMenu( result );
>> });
>> },
>>
>> members:
>> {
>> // eigenschaften
>>
>> ////////////////////////////////////////////////////////////////////////
>>
>> __menuxml: null,
>>
>>
>> // methoden
>>
>> ////////////////////////////////////////////////////////////////////////
>>
>> setMenu: function( menuxml )
>> {
>> this.__menuxml = menuxml;
>> },
>>
>> getMenu: function()
>> {
>> return this.__menuxml;
>> }
>>
>> }
>> });
>>
>> usage: var menu = qxgui.reg.MenuXML.getInstance().getMenu();
>>
>> now back to my problem ... when i run alert( menuxml ) in setMenu, i get
>> the
>> right output (some xml stuff). actually, the result is saved in the
>> property
>> __menuxml, right?
>>
>> but alert( menu ) gives me the damn null. any suggestions?
>>
>
> You're missing the main concept that it takes time (for the purpose of
> this
> discussion, assume 3 seconds even though that's unreasonably high in most
> real scenarios) to issue your remote procedure call, have the backend
> server
> process the request and send back the response, and for the client
> (qooxdoo
> program) to receive the response and call your listener function which
> calls
> setMenu(). Therefore when you call qxgui.reg.MenuXML.getInstance() it
> *begins* that process and returns. Three seconds later, the response
> arrives, your listener is called, and therefore the menu property gets
> set.
> So what's happening when you just issue this:
>
> var menu = qxgui.reg.MenuXML.getInstance().getMenu();
>
> the request has been issued before getMenu() is called but the response
> has
> not yet arrived, so the value of the menu property is still null, thus
> alert(menu) displays null. You are operating in an asynchronous world now,
> not a synchronous one. You must organize your program around events, not
> in-line code that you expect to block until a result arrives.
>
> Hope that helps.
>
> Derrell
>
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