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Cross-domain Google Analytics Campaign Transposing

/ Published in: JavaScript
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This script was written to allow transposing of utm_campaign, utm_source and utm_medium query parameters from the URL of a landing page link to all of the links on that page that re-directed to the primary domain where users would actually convert. This is highly useful when sending out email campaigns that link people to a landing page on a hosted service such as Unbounce and your conversion points exist on a different top-level domain as it will allow you to see the campaign, medium and source values on the top-level domain Google Analytics conversion reports, even though the visitor initially landed on a different top-level domain.

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  1. /**
  2.  * URL link updater for cross-site UTM code transposing
  3.  * 
  4.  * Update the validURLPattern variable regular expression to match your desired pattern
  5.  * that indicates link HREF values that go to the second-site.
  6.  */
  7. try {
  8.     // URL pattern regular expression, change this to match your call to action links
  9.     var validURLPattern = new RegExp("my-conversion-point-domain\.com");
  10.     // The search string
  11.     var queryStr = document.location.search;
  12.  
  13.     // Only update if we have UTM parameters
  14.     if(queryStr.match(/utm_campaign|utm_source|utm_medium/)){
  15.         // Build object of UTM parameters
  16.         var utm = {
  17.             campaign: queryStr.match(/utm_campaign/) ? queryStr.match(/utm_campaign\=([^&]*)/)[1] : "",
  18.             source: queryStr.match(/utm_source/) ? queryStr.match(/utm_source\=([^&]*)/)[1] : "",
  19.             medium: queryStr.match(/utm_medium/) ? queryStr.match(/utm_medium\=([^&]*)/)[1] : ""
  20.         };
  21.  
  22.         // Loop through all A tags and update
  23.         $('a').each(function(){
  24.             // Only update if HREF refers to dtelepathy.com
  25.             if(this.href.match(validURLPattern)){
  26.                 // Determine starting separator
  27.                 var sep = this.href.indexOf("?") == -1 ? "?" : "&";
  28.  
  29.                 // Loop through UTM parameters to update
  30.                 for(var k in utm){
  31.                     // Check if URL already contains this UTM parameter
  32.                     if(this.href.indexOf("utm_" + k) != -1){
  33.                         var regexp = new RegExp("utm_" + k + "=([^&]*)");
  34.                         this.href = this.href.replace(regexp, "utm_" + k + "=" + utm[k]);
  35.                     }
  36.                     // Append if not
  37.                     else {
  38.                         this.href += sep + "utm_" + k + "=" + utm[k];
  39.                         // Change separator now since we're appending to a now existing query string
  40.                         sep = "&";
  41.                     }
  42.                 }
  43.             }
  44.         });
  45.     }
  46. } catch(e) {}

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