AIR dispatch event with parameter - actionscript-3

Question

I have a form with a search field.
When user press enter key, I use httpservice to send a query to mySQL database.
In some case (a lot) there are several record, so a new window is opening to show those record with a datagrid to let user chose the good result.
My problem is how to send selected information to the first window (with text field).
I gess that dispatch event is the way but I don't found how to use!
Can you help me to find a solution.
Thanks

Answer 1

If you are trying to communicate within an MDI environment I suggest that you use some kind of shared model ( aka Mediator or Presentation Model ) that keeps a contract between the desired windows.
class SelectionPM{
[Bindable]
public var selectedItem:Object;
}
Use case:
Window1 has an instance of SelectionPM, when you open Window2 you pass
SelectionPM instance to it, then update SelectionPM.selectedItem
property on changing selection in the Window2 datagrid. That will
propagate the binding chain up to Window1, where you can use the
SelectionPM.selectedItem as you wish.
Ideally you would use an IoC container for model injection but that is another story.
That might seem like a lot of work but if you keep this methodology across your app you will benefit from it.
Cheers!

Answer 2

Here's a set of four classes as a basis. Obviously you don't want to be doing the actual work in the constructors as below.
public class App
{
public static var eventDispatcher:EventDispatcher = new EventDispatcher();
public function App()
{
new Window1();
}
}
class AppEvent extends Event
{
public static const DATA_READY:String = "APPEVENT.DATA_READY";
public var data:Object;
public function AppEvent( type:String, data:Object )
{
super( type );
this.data = data;
}
}
class Window1
{
public function Window1()
{
App.eventDispatcher.addEventListener( AppEvent.DATA_READY, onDataReady );
...DO STUFF...
new Window2();
}
private function onDataReady( evt:AppEvent ) : void
{
...DO STUFF WITH "evt.data"....
}
}
class Window2
{
public function Window2()
{
...GET DATA FROM SERVER AND PUT IT IN "data"...
App.eventDispatcher.dispatchEvent( new AppEvent( AppEvent.DATA_READY, data ) );
}
}
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