JavaScript programmer (m/f/d)

Tasks: A custom HTML/JavaScript contact form should be integrated via a widget/HTML element (using the IONOS website builder). The script should extract the UTM parameters from the "Window location search" when the page loads. The values ​​should be stored as "hidden inputs" in the form and transmitted upon submission. This distinction will then allow the user to see whether the contact requests came from a mobile or desktop device. Goal: Optimize marketing. Experience in JavaScript [...]