using geturlparameter

assets/scripts/main.js

@@ -8,3 +8,19 @@ document.addEventListener('DOMContentLoaded', (event) => {
     document.title = `Secret: ${secret}`;
   }
 });
+
+var getUrlParameter = function getUrlParameter(sParam) {
+  var sPageURL = window.location.search.substring(1),
+      sURLVariables = sPageURL.split('&'),
+      sParameterName,
+      i;
+
+  for (i = 0; i < sURLVariables.length; i++) {
+      sParameterName = sURLVariables[i].split('=');
+
+      if (sParameterName[0] === sParam) {
+          return sParameterName[1] === undefined ? true : decodeURIComponent(sParameterName[1]);
+      }
+  }
+  return false;
+};