How do I get the referrer's domain/host name using JavaScript?

Question

I know I can get the host name of the current page, by simply doing:

var myhostname = location.hostname; 

But how do I get the host name of the referrer? I can get the referrer by

var referrer = document.referrer; 

but unfortunately there's no document.referrer.hostname available in JavaScript. How can I get this value?

An example of where this is useful is if somebody clicks a link on google.com. I want to be able to retrieve google.com from the referrer (not the page and the query string).

Answer 1

This would do:

document.referrer.split('/')[2]; 

Example.