I am developing a form where the user needs to enter the maximum number of allowed things. Zero is a legitimate value meaning that none are allowed.
I need to find a special value to indicate that there is no limit (using a number slider is, unfortunately, not an option).
Which could be the best alternative among the following ones?
- Leaving the field blank means unbounded; note that this may conflict with a user request to make the field mandatory
-1as the special value
Nas the special value
99,999or something like that as the special value
Here is a mockup showing each alternative.