Hi all,

I have a field into which recipients type a number.

This number must be evenly divisible by 30 with 0 (zero) remainder.

How do I create an equation that ensures this happens?

Many thx,
Kim.

So you need to test if input of respondent x divided by 30 is without fraction

floor(x/y)==(x/y)

if floor(Inputvariable/30)==(Inputvariabe/30) is TRUE the input can be divided by 30 without a rest.

Just to add:

This is the so called "modulo" function (usually A % B ) which gives you the remainder of a division.

It is not implemented in LimeSurvey so far, but in the manual you find it.
www.limesurvey.org/manual/Expression_Man...mplemented_Functions

[hr]

Joffm

Thx Joffm and Jelo,

I can see why this would work but I cannot get the validation to work - see error attached.

Where/how do I enter this form Q15?

Formula is floor(Q15/20)==(Q15/30)

Thx again,
Kim.

This is no RegEx validation. Just a validation based on ExpressionScript(ExpressionManager). For further questions please attach a LSS-export of the relevant parts.

Look under the Logic section for question/subquestion validation.

Thx Jelo,

My external validation formula now is:
floor(Q15/30)==(Q15/30)
Is this correct?

How do I get the question ID?

Thx,
Kim.

jelo wrote: For further questions please attach a LSS-export of the relevant parts.

Hi,

Where/how do I enter this form Q15?

Formula is floor(Q15/20)==(Q15/30)

Please read
www.limesurvey.org/manual/Question_type_...28em_validation_q.29
and study the demo surveys in the demo installation which you find under "Resources / Demo".
There is a survey called "Demo of em_validatin_sq".
And the first question in this survey is ""Enter an even number", that is "Enter a number that is divisible by 2 without remainder". So exactly the same as your "Enter a number that is divisible by 30 without remainder"

How do I get the question ID?

Here


The ID of question with code Q1 is 2721.
But you do not need it.
Here you use the question code (Q15)


Your formula is fine (except of the typo). You only have to enter it in the right place, the question validation equation in "Edit / Logic".

Joffm

Thx Joffm,

Getting close... see attached PDF where I have added a question to the demo survey and included the validation - this works! Yay! However, if I add a question to my own survey in the same fashion the error does not show up when I enter a number not divisible by 30?? What am I missing. Do I need to configure my survey with some particular details to get this to work?

Thx again,
Kim.

survey in the same fashion the error does not show up

Obviously not.

And as Jelo said:
Instead of attaching your pdfs, it's always recommended to send a sample survey with only the important questions as *.lss

Okay:
With these settings:
question validation equation: floor(self/30)==self/30
question validation tip: {if(floor(self/30)!=(self/30),"The number you entered is not a multiple of 30","That's fine")}
Instead of "self" you can use the question code as well.

I get:







Joffm