Analytics submission tracking?

Is there anyone who have managed to make it work? To get submissions tracked in Google Analytics?

I followed these instructions:
http://gaconfig.com/google-analytics-event-tracking/contact-form/
and entered the resulting code in the “Submit button input attributes” field at the advanced tab.

But nothing at all turns up in Analytics.

https://ww.wp.xz.cn/plugins/si-contact-form/