Cross domain tracking Google Analytics

[jorisbrabants]

Hi there,

Got a question on cross domain tracking:

We have a couple of TLD's to serve localized content to our visitors, next to our main .com TLD where our app is running as well in a subdomain. Situation is this:

Local sites:
marketingsite.be
marketingsite.com.br
marketingsite.fr

Main site: marketingsite.com
app.marketingsite.com

Conversion gets triggered when somebody ends up in app.marketingsite.com/firstuse for example. People can sign up at the local site filling in their email but they end up in app.marketingsite.com/firstuse

Reading this article on cross domain tracking I'm getting a bit confused on the setup of the tracking code itself. The sample code provided shows these two lines:

  ga('require', 'linker');
  ga('linker:autoLink', ['maindomain.com','targetdomain.com']);

Now the question 

Is it correct when I think that maindomain should be replaced with our local TLD's on every one of those, and that targetdomain is where the conversion happens? In this case the .com site?

[KaneJamison]

Daniel's answer looks on point to me. Did you get this resolved Joris?

[tretanto]

Hi Joris,

Analytics.js uses a cookie that is not shared with other domains (subdomains are ok) so in order to track users across multiple domains there are two sides to be managed:

1. At the source domain: pass the cookie data to the destination domain.
2. At the destination domain: handle the cookie data received from the source domain.

In your case, source domains being your local domains and destination domain being your main domain.

You can accomplish this in a symmetrical fashion for all the domains involved by adding the code in this article from Google help. If you want a one way solution then take a less generic approach: https://developers.google.com/analytics/devguides/collection/analyticsjs/cross-domain