YsA.Net

In Updating an UpdatePanel in the Client side, I described how I solved the problem of updating an UpdatePanel from the client side. The solution was pretty simple : Create an extender which adds an hidden button to the update panel, and performs a click on it when the "update()" method is called from the JavaScript.

Recently I saw a new Webcast in the Asp.Net Ajax How Do I series which explains how to do this with and without the button. In short, the solution requires a call to a private method in the PageRequestManager which performs a post back :

var prm = Sys.WebForms.PageRequestManager.getInstance();
prm._doPostBack(updatePanelClientID,'');

So, I decided to upgrade the extender - Which now calls this method instead of adding a button and clicking on it. It makes the server and client code of the extender cleaner, and more simple.

Also I have fixed the issue of the OnUpdated event - which is now working perfectly : It is triggered when the "update()" method in the client is called. I caused the event to trigger by using properties from the ScriptManager :

ScriptManager currentScriptManager = ScriptManager.GetCurrent(Page);

if ((currentScriptManager.IsInAsyncPostBack) &&
    (currentScriptManager.AsyncPostBackSourceElementID == TargetUpdatePanel.ID))
   {
        OnUpdated(new UpdatedEventArgs());
   }   

I simply check if the post back is Asynchronies and was caused by the update panel (the id I used when I called the _doPostBack method in the client).

Feel free to download and use my brand new UpdatePanelExtender!

I will be glad to read your comments,suggestions, bugs, etc...

Have a great weekend.