FB login callback function not responding if user is already logged in facebook

Question

I am using fb connect using js. This is my code:

Answer 1

You need to replace

FB.Event.subscribe('auth.authResponseChange', function(response){     

with

FB.Event.subscribe('auth.statusChange', function(response){ 

As auth.authStatusChange event trigger on status change whether already logged in or login by giving credentials.

thanks