This whole jsonp thing is quite confusing...

Here is what I want to do:

• I have a class DataRetriever
• The class has a method GetData

• GetData makes a jsonp request with the following code:

  var new_tag = document.createElement('script');
  new_tag.type = 'text/javascript';
  new_tag.src = 'http://somesite.com/somemethod?somedata';
  // Add the element
  var bodyRef = document.getElementsByTagName("body").item(0);
  bodyRef.appendChild(new_tag);
  

Now, the jsonp data from the server somesite.com can call a function in my code with the data. The problem is, how does the data get delivered to the instance of DataRetriever that requested it?

I'm really stuck here.