Hi,

I have a general question about Web Services in MS Ajax.
The code snippet below shows a simple JavaScript class.

Type.registerNamespace("Namespace");

Namespace.Class= function(MainTagID) {
  this.MainTagID = 1;
  this.SomeOtherValue = "whatever";
}

Namespace.Class.prototype = {

  GetTagObject: function()
  {
     Namespace.Class.GetTagObject(this.MainTagID, param1, param2, 
        param3, this._onReceiveTagObject, this.onFailedCallback);
  },

  // This is the callback function that
  // processes the Web Service return value.
  _onReceiveTagObject: function(TagObject)
  {
    alert(this.SomeOtherValue)

  }

  ...

}

Let's say I create a new object and call the GetTagObject method.

var x = new Namespace.Class()
x.GetTagObject();

After a succesful WebService request, onReceiveTagObject gets called which returned a TagObject from the server.
However, I have lost all information about the client side JavaScript class (alert(this.SomeOtherValue) fires an error)

Is there an elegant solution to solve this?
My ideas so far:
1) Pass all the variables that I need on a return as additional payload (a lot of work) 
2) Create a global variable and pass the name of the instance as an additional parameter and call something like eval(TagObject.MyInstanceName + '.myFunction()') which is not a very elegant solution in my view.

Any thoughts on this one?

Thanks,

Andre

The onComplete function is not executing in the same context. Use the Function.createDelegate to resolve the this keyword. Try the following code:

Namespace.Class.prototype = {

  GetTagObject: function()
  {
	var handler = Function.createDelegate(this, this._onReceiveTagObject);

     Namespace.Class.GetTagObject(this.MainTagID, param1, param2, 
        param3, handler, this.onFailedCallback);
  },

  // This is the callback function that
  // processes the Web Service return value.
  _onReceiveTagObject: function(TagObject)
  {
    alert(this.SomeOtherValue)

  }

  ...

}