Send Google Analytics event on Marketo form submission

marketo-form-ga.js

MktoForms2.whenReady(function(form) {  
    form.onSuccess(function(vals, page) {  
      ga('send', 'event', {  
        eventCategory: 'Marketo Form',  
        eventAction: 'Form Submission',  
        eventLabel: formName,  
        hitCallback: function() {  
          document.location.href = page;  
        };  
      });  
      return false;  
    });  
  });