Help with Registered callback methods

[LeoBruno]

Hi:

I´m testing Intraweb 15.1 and

I need to get on server side (IWApplication) the result value from a javascript function executed on client side.

I have read this dodumentation http://docs.atozed.com/docs.dll/developm...015.1.html
and these threads https://www.atozed.com/forums/showthread.php?tid=498 , https://www.atozed.com/forums/thread-1134.html

Also IW CustomAjaxCall Demo.

But I find all very confusing, because i need the return values on server side.
So Why should I use a callback method, when all I need to do is to get a result value that is on the client side?
Also, I´m not sure if I got this right.

Here is what I have so far...

1- the CallBackMethod:

procedure TfrmBase.clbkGridSel(aParams: TStrings; out aResult: string);
begin
  aResult := aParams.Values['Selection'];
end;


2 - the registration of the callback method

procedure TfrmBase.IWAppFormCreate(Sender: TObject);
begin
  WebApplication.RegisterCallBack('clbkGridSel', clbkGridSel);
end;


How do I get, on server side, the aResult from the callback method to process this information?

I wrote this method to execute the callback on client side, but as you can see, It doesn´t help me to get the information.

function TfrmBase.GetSelecaoGrid: string;
begin
  WebApplication.
    CallBackResponse.
      AddJavaScriptToExecute('ajaxCall("clbkGridSel", "&Selection="  + GRIDCADUSUARIOGetSelected()');
end;

GRIDCADUSUARIOGetSelected() id the javascript function that will return the selected data.

In other words, what I need to accomplish, is to be able to call javascript "GRIDCADUSUARIOGetSelected() " from Server Side, and get it´s result value.