Fire script after form succes message

Hey webmonnik,
Here is a script that fires an alert box on the form success:

function custom_script(){
  ?>
  <script>
//triger an alert when the contact form class "avia-form-success" is added the div "ajaxresponse"
//this gives an alert box popup.
$(function() {
  var button = $('.button')
      , response = $('.ajaxresponse')
  ;

 button.on('click', function() { 
    response.addClass('avia-form-success');
    $(document).trigger('ajaxAlert');
  });
  $(document).on('ajaxAlert', function() {
    alert("The response has been given");
  });
});
</script>
<?php
}
add_action('wp_footer', 'custom_script');

so you can just modify the last trigger for your needs, without testing I believe it would look like this:

function custom_script(){
  ?>
  <script>
$(function() {
  var button = $('.button')
      , response = $('.ajaxresponse')
  ;

 button.on('click', function() { 
    response.addClass('avia-form-success');
    $(document).trigger('ajaxAlert');
  });
  $(document).on('ajaxAlert', function() {
    dataLayer.push({'event' : 'formSubmitted', 'formName' : 'Name form});
  });
});
</script>
<?php
}
add_action('wp_footer', 'custom_script');

Please give this a try.

Best regards,
Mike