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
- Use
-1
as the special value - Use
N
as the special value - Use
99,999
or something like that as the special value
Here is a mockup showing each alternative.
download bmml source – Wireframes created with Balsamiq Mockups
Answer
You should add a check box that indicates that the number of things are limited.
(Thus: An unchecked box indicates that there are unlimited number of items).
download bmml source – Wireframes created with Balsamiq Mockups
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