Get referral URL in javascript

Question

I want to see how much traffic I get from various URL reduction services, for example

bit.ly

tinyurl.com

But since they use 301 redirects, they do not appear in my analytics.

How to find out who redirects traffic?

Or

More precisely, how can I get the referral url in javascript for another kind of redirect?

Answer 1

document.referrer

Example:

 if (document.referrer && document.referrer != "") document.write('Thanks for visiting this site from ' + document.referrer);