Handling Stripped UTM Parameters in Drupal on Pantheon

Staff Reporter

Marco Bouwer of The Savvy Few explains how to handle Pantheon’s automatic stripping of "utm_" query parameters, which replaces their values with "PANTHEON_STRIPPED" to optimize caching performance. Since these stripped values are inaccessible via PHP, Marco outlines a JavaScript-based solution for retrieving and storing them within a Drupal webform submission.

The approach involves adding hidden fields in the webform for utm_source, utm_medium, and utm_campaign and using a custom JavaScript library, crmleads.js, to pre-fill these fields by extracting values from the URL. A helper function ensures basic XSS prevention, while a Drupal library definition file, crmleads.libraries.yml, loads the script. Additionally, the implementation of hook_webform_submission_form_alter() allows the JavaScript to conditionally load for relevant CRM webforms.

This method ensures that marketing-related UTM parameters can be captured and utilized within a Drupal application without affecting Pantheon’s caching mechanisms.

Source Reference

Title

Handling Stripped UTM Parameters in Drupal on Pantheon

Byline

Marco Bouwer

Date of Publication

21 February 2025

Organization

The Savvy Few

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Drupal

Tutorial

Pantheon

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