First of all, thanks for shipping the new Choice Availability counter. It solves the basic “stop over-booking” problem.
What’s missing, though, is a way to react when an option is sold out. Right now we can only disable/hide the choice; we can’t fire a Field Rule or display a custom message the moment the remaining quantity hits 0.
Why this matters
We want to show an alternative field (“Join the wait-list”, “Contact us”, etc.) automatically—without forcing the user to refresh the page.
We shouldn’t have to rebuild stock logic in Deluge/Flows or inject custom JavaScript just to detect “sold out”.
A formal event/condition keeps everything inside the no-code interface you’ve already built.
What would solve it
Expose the current stock value as a variable that Field Rules can evaluate (e.g., Option.Stock == 0).
Or, fire a dedicated trigger/event (OnChoiceSoldOut) so we can link it to Show/Hide Field actions.
Either approach would let us keep the UX clean and stay 100 % within Zoho Forms.
Thanks for considering this quality-of-life improvement.
—Michel