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function trackEvent(event) {
  var trkUrl = "/track"
  var data = window.btoa(JSON.stringify(event));

  // Creating a 1x1 image is a method for sending GET requests supported by all browsers:
  var img = document.createElement("img");
  img.width = 1;
  img.height = 1;
  img.src = trkUrl + "?data=" + data;

  return img;
}

trackEvent({ pageUrl: window.location.href, type: "pageview" });

document.addEventListener("submit", function(e) {
  trackEvent({ type: "form-submit", formId: e.target.getAttribute("id") });
});