Firing Atlas UpdatePanels from a Flash movie
A friend of mine asked me about how to solve the following problem:
He has a Flash movie in which he can call javascript but needs to trigger an Atlas (or rather ASP.NET Ajax... sigh) UpdatePanel. In his code-behind he wants to load a different user-control based on the button that was clicked in his Flash movie.
I cooked him up a solution that generates a single line of javascript which he can copy/paste in his Flash movie and use to trigger the UpdatePanel.
The magic happens by implementing the IPostBackEventHandler interface. I created a simple control that implements this interface and exposes an event that gets called so that external observers can be notified when a postback occured:
1: public class RaisePostbackProxy : Control, IPostBackEventHandler
2: { 3: public event EventHandler<NewPostBackEventArgs> HandlePostback;
4:
5: public void RaisePostBackEvent(string eventArgument)
6: { 7:
8: }
9: }
I added this control to my aspx page and wired the HandlePostback event, now I can be notified when the user clicks any link or button in the flash movie and load the appropriate usercontrol by looking at the Argument property of the NewPostBackEventArgs parameter.
I have created a sample solution demonstrating this (very simple) approach. The solution can be downloaded here.
Hope this helps somebody.
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