chrisle · December 7, 2016 15:55 · Dec 7, 2016
diff --git a/answer.js b/answer.js
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+
+/**
+ * To answer @AnnieCushing's question on Twitter:
+ * https://twitter.com/AnnieCushing/status/806518054368739329
+ * 
+ * Author: Chris Le - @iamchrisle
+ *
+ * There's a few ways to do this.
+ * - Like @SimoAhava suggested, server redirects that strips parameters if you
+ *   have the ability to control the server.
+ *  
+ * Here's a JavaScript / GTM solution if you only have the ability to change
+ * the code on the pages: Use the DataLayer to hold either the 
+ * UTM campaigns if the referrer is or is not "primarydomain.com".
+ *
+ * This code would go on every page near the GTM tag.
+ *
+ * Technically speaking if you have nothing but access to GTM and GA, you could
+ * also sneak this code into a custom HTML tag.
+ *
+ * So.. this would go into the page...
+ */
+
+(function() {
+  var getParameterByName = function(name, url) {
+    if (!url) {
+      url = window.location.href;
+    }
+    name = name.replace(/[\[\]]/g, "\\$&");
+    var regex = new RegExp("[?&]" + name + "(=([^&#]*)|&|#|$)"),
+        results = regex.exec(url);
+    if (!results) return null;
+    if (!results[2]) return '';
+    return decodeURIComponent(results[2].replace(/\+/g, " "));
+  }
+
+  if (document.referrer.indexOf('primarydomain.com') == -1) {
+    window['dataLayer'].push({
+      utmVariables: { 
+        campaignSource: getParameterByName('utm_source'),
+        campaignCampaign: getParameterByName('utm_campaign'),
+        campaignMedium: getParameterByName('utm_medium'),
+        campaignTerm: getParameterByName('utm_term'),
+        campaignContent: getParameterByName('utm_content')
+      }
+    });
+  } else {
+    window['dataLayer'].push({
+      utmVariables: {
+        campaignSource: '',
+        campaignCampaign: '',
+        campaignMedium: '',
+        campaignTerm: '',
+        campaignContent: ''
+      }
+    });
+  }
+})();
+
+//////////////////////////////////////////////////////
+
+/**
+ * Then in GTM create a few dataLayer variables that pulls that stuff.
+ *
+ * One variable named "UTM Source"
+ *   Data Layer variable name: "utmVariables.campaignSource"
+ *   Data Layer version: 2
+ *   
+ * One variable named "UTM Campaign"
+ *   Data Layer variable name: "utmVariables.campaignName"
+ *   Data Layer version: 2
+ *
+ * ... and so on for all 5 variables.
+ */
+
+/**
+ * Finally, in your Google Analytics tag, under "more settings", "fields to set"
+ * add them:
+ *
+ *  +-----------------+--------------------+
+ *  | Field name      | Value              |
+ *  +-----------------+--------------------+
+ *  | campaignSource  | {{ UTM Source }}   |
+ *  | campaignName    | {{ UTM Campaign }} |
+ *  | ..... so on.    |                    |
+ *  +-----------------+--------------------+
+ */
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