Are you trying to prevent people from submitting a duplicate coupon code before pressing submit?
That is not possible with Airtable’s forms, but your #1 best bet for this is to use Fillout’s advanced forms for Airtable because it communicates directly with Airtable and it lets you prevent duplicate form submissions based on any text fields (or email fields) that you specify.
Fillout offers hundreds of features that Airtable’s native forms don’t offer, including the ability to prevent duplicate form submissions, update Airtable records using a form, create custom PDF files from a form submission, accept payments on forms, display Airtable lookup fields on forms, create new linked records on a form, control access to a form via SSO or email domains or a list of email addresses stored in Airtable, perform math or other live calculations on your forms, collect signatures on a form, create multi-page forms with conditional paths, connect a single form to dozens of external apps simultaneously, add CAPTCHAs to your form, and much more.
I show how to use a few of the advanced features of Fillout on these 2 Airtable podcast episodes:
Hope this helps!
If you’d like to hire the best Airtable consultant to help you with anything Airtable-related, please feel free to contact me through my website: Airtable consultant — ScottWorld