Data Layer Push Event for Tracking Contact Form 7 Submissions from Different Forms with Google Tag Manager

index.html

<script>
  // CF7 Submit Trigger
  document.addEventListener( 'wpcf7mailsent', function( event ) {
      if("311" == event.detail.contactFormId) {
        dataLayer.push({'event': 'Contact Form Submitted'});
      } else if ("842" == event.detail.contactFormId) {
        dataLayer.push({'event': 'R500 OFF Form Submitted'});
      }
  }, false );
</script>