This javascript class allows making remote method callbacks to the server using JSON messaging. The control calls back to ASPX pages or control on a page that contain methods marked up with a [CallbackMethod] Attribute.

The client code is very simple:

        
csharp
        

            
        
     

        
csharp
        

            
        
     
var Manual = new AjaMethodCallbackAjaxMethodCallback("Callback","SimpleMethodcallbacks.aspx");

Manual.targetControlId = "Page";  // optionally specify control ID

// *** Call method: Method name, Array of parameters, Callback and Error handlers
Manual.callMethod("AddNumbers",[212,122],ManualMethod_Callback,OnPageError);
...
function  ManualMethod_Callback(Result)
{ 
	alert(Result); // 434
}
function OnPageError(OnPageError)
{
	alert(Result.message);
}

Using this class provides declarative logic to make a remote method calls from JavaScript code including the ability to route calls to a specific server control. This makes this a powerful tool for control developers to have client code communicate back to their controls in a control localized manner.