Hijack Engagebay form redirection to add external params like UTM

engagebay_utm_hijack_onsubmit.js

  // Hijacking Engagebay HTML form submission redirection
  // By: Luong Ngoc Minh
  // Usage: Replace the original form submit function, for custom form with dedicated Submit button, not for embeded form
  function onSubmit(e, t) {
    e.preventDefault();
    window.EhForm.redirect_to_url = function(a, f, i, b) {
      var g = f;
      try {
        g = JSON.parse(f);
      } catch (h) {
        console.log(h);
      }
      var j = {
        subscriber_data: JSON.stringify(g),
      };
      var c = a;
      c = eh_mustache_fill_Subscriber_Data(g, c);
      if (i) {
        c = EhSync.prepareURL(c, j);
      }
      var d = window.open(c + document.location.search, b ? "_blank" : "_self");
      d.location;
    };
    window.EhForm.submit_form(e, t);
  }

engagebay_utm_hijack_prepareUrl.js

  // Hijacking Engagebay HTML form submission redirection
  // By: Luong Ngoc Minh
  // Usage: For embed form, copy the following code to your EngageBay install script, inside EhAPI.after_load function

...
window.EhSync.prepareURL = function (a, c) {
          if (c) {
            c.callback = "?";
          }
          var e = "";
          for (var b in c) {
            var d = c[b];
            if (d && typeof d != "string") {
              continue;
            }
            d = b == "callback" ? d : encodeURIComponent(d);
            e += b + "=" + d + "&";
          }
          // a hack try to keep the query string
          let inject = document.location.search.replace("?", "");
          e += inject;
          // -----------------------------------
          console.log('hack', e);

          a = (a.indexOf("?") == -1 ? a + "?" : a + "&") + e;
          return a.lastIndexOf("&") != a.length - 1
            ? a
            : a.slice(0, a.length - 1);
        };
...

/// For example
 <script type="text/javascript">
      var EhAPI = EhAPI || {};
      EhAPI.after_load = function () {
        EhAPI.set_account("...", "...");
        EhAPI.execute("rules");

        // Hack to fix the form
        console.log("EhAPI.after_load hook ran");
        window.EhSync.prepareURL = function (a, c) {
          ....
        }
        
      };
</script>