custom validation on Google G-Suite Form with an add-on

Question

I am looking to do custom validation on a Google Form. I figure I need to add custom code to the form. The only events available are on open and on submit . on open is for when the form is opened for editing, not submitting. So there does not seem to be a way to add custom validation to the form this way.

I was looking at the various Form Add-on examples but all of them seem to modify the form edit experience. Is it possible to modify the form view/submission experience? Could I use an add-on to add custom validation (ie only weekends selected on a date field)?

Answer 1

Google doesn't offer a way to use code to customize the view/submission experience for Google Forms and add-ons can't add custom validation for the same reason.

One alternative among many others is to use Google Apps Script to create a web application.