Tracking Popup "Contact Us" with no URL & unique form ID
my current website has this fixed navigation at the side with a popup "Contact Us" which I'd like to track when a user clicks on the submit button. It has the below characteristics:
- Popup with no "Thank you" page
- Available on every page of the website
- No unique URL (since it's a popup)
- No unique form ID (ID is dynamic and changes each time you click)
I'm wondering how can I track this conversion by using both Google Analytics & Google Tag Manager?
Much thanks in advance.