What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
At JotForm, we want to make sure that you’re getting the online form builder help that you need. Our friendly customer support team is available 24/7.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
How can I limit the amount of items that can be purchased in my form?Asked by maducie on November 25, 2014 at 04:47 PM
If I have only 12 seats in a class, how do I have the form not receive anymore sales after 12 seats are sold?
You can limit the number of submissions in your form as described in this guide: https://www.jotform.com/help/137-How-to-Limit-Submissions-in-a-Form
In your case, one submission will count as one seat. So, you need to limit the quantity of painters per purchase to one (if this is how you control the available seats) in order to make the limit works correctly.
Let us know if this helps.