ConfiForms validate number of chosable Multiselect options

[Roman Manukjan]

Hi!

I am working on a ConfiForms form and using a multiselect field there.
We have a requirement to restrict the user's choices to exactly 3, meaning a validation should throw an error "please select exactly 3 options".



Unfortunately we are limited to the built-in functionalities of ConfiForms. I cannot use any custom user macros. Neither can I use a CSS or a HTML macro.

Is there a way to achieve this within the ConfiForms validation rules?


Thanks for any help!

Best regards,
Roman

[Alex Medved _ConfiForms_ · Accepted solution]

Hi @Roman Manukjan and welcome to this community

There is no need to do anything “custom”, just use the “Validation rule” https://wiki.vertuna.com/display/CONFIFORMS/ConfiForms+Field+Definition+Rules#ConfiFormsFieldDefinitionRules-Validationrule

And have it’s condition parameter set to something like this

Assuming the field is named “multi”

multi.asCount:>3

Ps, dont forget to set the “message to show when validation fails” parameter

Alex

[Roman Manukjan]

Hi @Alex Medved _ConfiForms_

Thank you very much for this hint, It works perfectly! My problem was, that I was not aware, that I can use the 'as count' expression for checkbox groups.

As I need exactly 3 options to be selected, I've adapted the condition a little:

overweighting.asCount:>3 OR overweighting.asCount:<3

Cheers!
Roman 

[Alex Medved _ConfiForms_]

I am using the function mentioned here https://wiki.vertuna.com/display/CONFIFORMS/Virtual+functions

The condition for your case could be simplified to 

!overweighting.asCount:3

Alex