Submitting form data to backend server

I have a form that collects a few data fields, then has user press "Submit" button. I want to send this data to our backend server (I do not want to use any of the Storage options, as we want our server to take action after the submit).

My solution was to add some javascript into the  advanced --> POST-SUBMIT HTML area and do a POST to our server, which seems to get called fine when button is pressed:

However, it seems there's no way for me to grab the actual form data entered by the user and send it as part of this POST message to our server.

Is there a way to access the form data inside my javascript in the POST-SUBMIT HTML? Or is there another way to do this that I'm not thinking of?

Thanks!

Same question here! Any update so far?

Thanks

I'm facing the same dilemma