Recently a client asked for some help with their Google Analytics tracking. They have been trying to get it working on and off for the last year without much success.  They have a website that contains a booking engine that is provided by a third party. This is hosted on a different domain from their main website. They wanted to be able to track a visitor all the way through the booking process. So, being able to see where they were referred from (Google Search, Adword etc.), what pages they visited on the main website, which pages on the booking engine they visited, and finally the value of any booking they made.

Without this information they found it pretty impossible to gauge the ROI from any marketing campaigns they ran.

Liking a challenge I said I’d help them out.

I like to think I know my way around Google Analytics, having had some excellent training from iVantage last year, and being able to put that into practice on all of my clients site without issue. However I’d not really worked with tracking content within iframes before.

Now let me start with being open and honest, a lot of my help came from this great website. Via Google Translate I was able to work through the examples and get my head around it. However I thought I’d rewrite it here in English as I did come across a couple of gotchas that might help someone else.

Why can’t I just put the Google Analytics tracking code on the main website and on the iframe site?

If we take the following code as an example:

If you put this on the main website, and the iframe site – the tracking will work. You’ll see hits appear in Google Analytics for each of the pages. However, as the visitor browses between the main website, and the iframe content they will not be counted a one single visit. Instead, when they hit the iframed content they will marked as a brand new visitor with a referrer of your main website (and not the original Google search for example). So pretty useless really.

Why does this happen?

Google Analytics does not share cookie information between different domains (for the obvious privacy reasons!). When you visit it creates a cookie on your computer tied to that domain name that contains information about where you came from (i.e. Google search), the keyphrase you entered etc. This is what it uses to feed back to Google Analytics. When you load the iframed content it creates a brand new cookie for that domain name ( without being able to access the cookie from the parent website. So it is impossible for Google Analytics to know that you want the referrer information (i.e the original Google search performed) to be used.

Ok, what is the fix?

You need to load the iframe content in a way that tells Google Analytics to pass the cookie information from the parent ( to the iframe domain (

This is done through a bit of Javascript

Then to call this script you just need to add it to the body tag.

What this does is tell Google Analytics to load the iframe and pass across the contents on the parents website Google Analytics cookie to it. The code you need to install on the iframed website is pretty much identical to the main website.

You just need to change the SetDomainName to ‘none’ as it will use the information passed across from the main website.

What are the gotchas you mentioned earlier then?

1) My client was using an old implementation of the Google Analytics tracking code (there have been a number of versions of the years) and it contained this line;


This used to be a requirement to load the cookie data. However over the years Google have wrapped this call into their main javascript function and now is redundant. Having it left in there doesn’t usually cause any issue. However, the gotcha I came across was this line was in the tracking code on the iframe before these lines;


setAllowHash(false) and setAllowLinker(true) tells Google Analytics to use the date being sent over from the parent website, and not create a new cookie.

HOWEVER, if you call initData BEFORE these lines it ignores them and DOES create a new cookie! I scratched my head over that one for a while (why why why isn’t this tracking?!).

You don’t need initData anymore, if you have it you can safely remove it.

2) Internet Explorer will stop cookies from being created in iframed content. This is by design and for privacy protection. The way round this is to create a P3P policy (more info here). This is simple to do (we used to create the policy). Once implemented don’t forget to update your main websites privacy policy explaining how you use tracking cookies.

3) The tracking code is CaSe SeNsItIvE! I lost a good few hours chasing this issue. A mistyped pagetracker rather than pageTracker broke the tracking completely. Watch out for that one 🙂

That’s pretty much it

Once you have the linking working you can set-up your tracking as normal on the iframed content, so in our instance we had eCommerce tracking in place too.

This just used the standard eCommerce tracking code just make sure you modify it to include the following again (after the

var pageTracker = _gat._getTracker('UA-XXXXXX-X');

I hope this helps someone.