Click Variables

A surprisingly common question in forums and communities seems to be why the built-in Click variables show up as undefined in Google Tag Manager’s Preview mode, even if you click around the site.

In this article, I’ll walk you through some of the reasons why this might happen.

Tip 104: What to do when Click variables are undefined

Here’s the situation: you want to create a Click trigger for your tags, but in order to do so, you’d need to see what values the built-in Click variables (e.g. Click Classes, Click ID) get. Thus, it’s a chick-and-the-egg situation - you can’t create the trigger until you know what to track, and you can’t track until you create the trigger.