Can you make selector item non selectable in drop-down list?

[Leanne_Persang]

I have an event that people can register for, but only a number of people can register for each session. Once a session becomes full, I'd like to update the selector... does it make sense to just remove it? My concern with deleting it was there would be a jump from session 5 to session 7, for example. Or, am I able to keep it but make it not selectable?

For now, I changed the wording... but technically people can still select it and submit.

And, what is best practice? I am sure this has been done before!

Thanks!

[hclark · Accepted solution]

If anyone else finds their way here and can't figure out why it won't work...make sure you add a space after "[DISABLED]" in the Display Value editor. The script matches a string that starts with [DISABLED] followed by a whitespace character. Took me longer than I care to admit to figure this out...so commenting incase this helps out someone else!