Custom Goal Metric for Target Test

Hi,

I am trying to create a test that will report on the number of times a button was clicked and whether any interaction occurred with its required textbox before the button was clicked.

My idea is to dynamically change the data-analytics attribute of the button to show whether any interaction occurred with the textbox before the button was clicked.

I have the test set up with that assumption, although I'm not completely certain it's correct.

I want to ask if anyone can give me detailed info on the data-analytics attribute and how it works with the reporting interface. 

Thank you