Example of how to use the .on formSubmit listener.

formSubmit.js

<script>
    jQuery( document ).ready( function() {
        //Setup our on formSumbit Listener. 
        jQuery( document ).on( 'nfFormSubmitResponse', function() {
            //Do Stuff
            ga('send', 'event', 'Email List', 'Subscribed', 'New Subscriber');
         });
    });
</script>

Perhaps the suggested code snippet in https://ninjaforms.com/event-tracking-for-ninja-forms-no-plugin/ should be something like this instead?

jQuery(document).on( 'nfFormReady', function() {
	nfRadio.channel('forms').on('submit:response', function(form) {
		ga( 'send', 'event', 'form', 'submit', form.data.settings.title, form.data.actions.save.sub_id );
	});
});

Advantages:

• The example is a lot clearer for people that might want to additional filtering or send specific form data
• Better defaults if used for all forms (it sends the form title and response id)

Haven't tested extensively, so not sure "form.data.actions.save.sub_id" is available if data is not stored (I'd assume not)? May need a few more tweaks to be truly drop-in.

Didn't work out of the box - but nice approach though...

use simple if condition, to use form title as event label.

<script>
jQuery(document).ready(function(){
jQuery(document).on('nfFormSubmitResponse', function(event, response, id){
if(response.id == '2'){
ga('create', 'UA-**********-*', {'name': 'gaCode'}); // optional in case if you need to specify the tracker.
ga('gaCode.send', 'event', 'NF submissions', 'Form Submitted', 'Enquire');
}
});
});