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Welcome to the utm-retainer wiki!

Here are the steps on how I created the UTM retainer.

1. On GTM, create a Custom HTML Tag, copy and paste the code below: Change only the domain name on line 4 of the script.

<script> (function() { var domainsToDecorate = [ 'replacethisdomainname.com', //add or remove domains (without https or trailing slash) ], queryParams = [ 'utm_medium', //add or remove query parameters you want to transfer 'utm_source', 'utm_campaign' ] // do not edit anything below this line var links = document.querySelectorAll('a'); // check if links contain domain from the domainsToDecorate array and then decorates for (var linkIndex = 0; linkIndex < links.length; linkIndex++) { for (var domainIndex = 0; domainIndex < domainsToDecorate.length; domainIndex++) { if (links[linkIndex].href.indexOf(domainsToDecorate[domainIndex]) > -1 && links[linkIndex].href.indexOf("#") === -1) { links[linkIndex].href = decorateUrl(links[linkIndex].href); } } } // decorates the URL with query params function decorateUrl(urlToDecorate) { urlToDecorate = (urlToDecorate.indexOf('?') === -1) ? urlToDecorate + '?' : urlToDecorate + '&'; var collectedQueryParams = []; for (var queryIndex = 0; queryIndex < queryParams.length; queryIndex++) { if (getQueryParam(queryParams[queryIndex])) { collectedQueryParams.push(queryParams[queryIndex] + '=' + getQueryParam(queryParams[queryIndex])) } } return urlToDecorate + collectedQueryParams.join('&'); } // borrowed from https://stackoverflow.com/questions/831030/ // a function that retrieves the value of a query parameter function getQueryParam(name) { if (name = (new RegExp('[?&]' + encodeURIComponent(name) + '=([^&]*)')).exec(window.location.search)) return decodeURIComponent(name[1]); } })(); </script>

2. Create Trigger type DOM Ready
3. Choose Some DOM Ready Events
4. Add this condition: Page URL matches RegEx (ignore case) utm_medium=|utm_source=|utm_campaign=|ref=