https://www.visitnc.com/webform/javascript/contact_us_form/custom.js?tm8gy7

1(function ($, Drupal) {
2  Drupal.behaviors.captureUTMParams = {
3    attach: function (context, settings) {
4      // Parse URL parameters
5      function getUrlParameter(name) {
6        name = name.replace(/[\[]/, '\\[').replace(/[\]]/, '\\]');
7        var regex = new RegExp('[\\?&]' + name + '=([^&#]*)');
8        var results = regex.exec(window.location.search);
9        return results === null ? '' : decodeURIComponent(results[1].replace(/\+/g, ' '));
10      }
11
12      // Capture UTM parameters
13      var utmCampaign = getUrlParameter('utm_campaign');
14      var utmSource = getUrlParameter('utm_source');
15      var utmMedium = getUrlParameter('utm_medium');
16      var utmContent = getUrlParameter('utm_content');
17      var utmSalesforceCampaign = getUrlParameter('Salesforce_Campaign_Name__c');
18
19
20      // Populate hidden fields in the webform
21      $('input[name="utm_campaign__c"]').val(utmCampaign);
22      $('input[name="utm_source__c"]').val(utmSource);
23      $('input[name="utm_medium__c"]').val(utmMedium);
24      $('input[name="utm_content__c"]').val(utmContent);
25      $('input[name="utm_salesforce_campaign_name__c"]').val(utmSalesforceCampaign);
26    }
27  };
28})(jQuery, Drupal);