End a (split) AB test when clicking on convert-kit submit button?

I don't see the ability to end an AB test with split via a JS call, it seems that this gem is ruby only. I'd like to end a test when a user clicks on the signup button in convertkit ( which I can access with the selector button.formkit-submit).

Any ideas?

There's no AB testing built-in to Jumpstart right now, so it really comes down to whatever tools you're using. 

You can probably integrate with Convertkit's forms client side and add an event listener when the form submits if you have a JS split testing library you're using.

For server-side tracking you can have a Rails form submit to the Rails app and track the conversion and add the user to the form through the Convertkit API.