eSearch Widget Auto-Complete: what source code

[BingJing]

Please see attached screen. 
For the bottom input box auto-complete drop-down list, I am trying to use a different REST service layer other than the one configured above.

What JavaScript source code population the  "Processing unique values: x of x" and all the drop down items(for auto-complete)?

Thank you

[RobertScheitlin__GISP · Accepted solution]

Bing,

   The PagingQueryTask.js is the file that does all the working for querying the service and getting unique results.

[BingJing]

Thank you very much for the clue.   
Widget.js->Parameters.js->SingleParameter.js->PagingQueryTask.js 

I also need to read these related files to understand PagingQueryTask file.