Hi Ben. I work with Ryan and have also helped develop this script. Our team has been brainstorming regarding UTM tracking and reporting over the past few months, and we have rewritten this particular script from scratch to improve upon the methodolgy. (I suppose we need to update the blog post, too!)
Here is the latest version of the UTM tracking script: http://bit.ly/2gdKeTm
While it may not address your particular iframe use case, this version of the script is better than older versions in several ways:
- First, it adds the hidden form fields for you, so you don't have to add them manually on your forms.
- Also, the cookie is deleted upon successful form submission, so that the UTM values are logged only once.
- Next, the cookie domain is auto-detected so that you usually don't need to bother changing the default setting. (Note that this currently works for only a handful of TLDs. If you don't use a .com, .net, .org, .co.uk, .co or .us TLD, you'll want to set this manually at the top of the script. Hoping to include better domain detection in a future version.)
- Last but not least, the setup is much simpler and better explained. Your Marketo fields are easily mapped at the top of the script.
As for the iframe itself, Sanford is correct that you can dynamically create the iframe inside a specific div and pass the query string into it. But why are you using an iframe in the first place? What are you trying to solve for? Is there a reason the default form embed code will not work directly on the page instead of using an iframe?
One final thought: the tracking script can only read cookies from the primary domain name where it is hosted. If you are hosting it, for example, in your Marketo instance at pages.example.com, the cookie created will be set for example.com rather than pages.example.com. This means that if/when the same script runs on your website at example.com, it can access the same cookie there as well. This is not true, however, when the two domains are different; the script can only read the tracking cookie for the same domain from which it was set.
(Incidentally, we're also working on a solution to merge records, known or anonymous, from different Munchkin-tracked domains into the same Marketo lead record. We have a working proof of concept, but it is not production-ready code yet. Ping me if you're interested.)
Josh and Sanford, thank you both for chiming in to help Ben.
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