How to allow selection of multiple items within a choice field?

[ty_roach]

I'd like to create a custom field that provides a list of choices (e.g. A, B, C, D, E), but I want to allow more than one of the field's values to be selected (e.g. select A, C, D). How can I do that with the choice field? ...or should I be using a different field type?

[Mark Stanger]

You can't do this with a choice field unfortunately. You have to use True/False or List fields to do multiple selections.

[HugoFirst]

I implemented a similar multiple choice "variable" by using multiple checkbox variables, one per "choice value". Couple them with a label field to display the "choice variable" name. For example in your list of variables for the form you could have:

1. Label = My Options
2. Checkbox = option #1
3. Checkbox = option #2
4. Checkbox = option #3


This will appear under the heading "My Options" and show 3 options. Any one, two or three options may be selected.

Now this leaves me with a quandry though. If I want to require that at least one value is selected, how can I do that?
I'm experimenting with a client script, but so far it's been alot of trials with alot of errors.

[Mark Stanger]

That's great. What you've described is actually the same thing that I've written about on SNGuru.
http://www.servicenowguru.com/system-definition/multiple-checkbox-variables-service-catalog-surveys/

I've also got an article showing how to make checkboxes mandatory.
http://www.servicenowguru.com/scripting/client-scripts-scripting/checkbox-variables-mandatory/

[HugoFirst]

I like your 2 fold approach, 1-mark the label as mandartory, 2- count the selected values and if it does not exceed a desired count ( 0 in my case ), pop up an alert.

This worked the very first time I tried it. Your comments in the scripts allowed me to easily make the modifications needed for my situation.

Thank you Mark!