How do I not allow a checkbox option?

i have a form where a customer can select one of several dates for a class. i want to be able to not allow them to choose a date b/c the class is filled.

is there a condition i can use to do that?

i.e., if the Tue, Aug 9 class fills up, can i still leave it in the list, but when they select it, a note comes up "Class is filled"??

thanks.

You can actually use any of the follow widgets for this purpose:

Inventory widget 

Ticket Purchases widget 

Quantity Gift Registry widget 

Gift Registry widget 

Appointment Slots widget 

These widgets allows you to set a specific quantity on items, every time your users select and submit the form, the number of available quantity decreases. So let's say 25 students have already filled out Class 1 with an available quantity of 25, then the option will show that there's no more slot.

To add those widget on your form, you can check this guide: https://www.jotform.com/help/252-How-to-Add-a-Widget-to-your-Form 

Let us know if that works for you.

thanks!! the Appt Slots widget worked perfectly.