Autocomplete request object in source callback

Autocomplete request object in source callback

Hello,

Is it possible to get the request object in the source callback of the jQuery UI autocomplete function?

Example:
  1. $("input[name=q]").autocomplete( {
                source: function( request, response ) {
  2.                   ... get request object that calls this function ...
  3.             }
  4. } );
It is possible in the focus(), select() and change() function, but why not in the source? Or am I missing something?
The variable request only contains the term property. Calling $(this) will give me the jQuery core object.