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Hello,

I would like to validate a numerical input on a question based on the numerical answer of the previous question. For example if an answer to a question is 5 it can't be greater than 4 in the next one. I found the regular expression and the Question validation equation in the settings, but I am not sure if I can add the previous question answer to it or how to exactly.

Thank you.

Something like this in the question validation equation:


- manual.limesurvey.org/ExpressionScript_-_Presentation/en

And there is the setting "Maximum value" in the "Input" menu.
Just enter the code yoof ur previous question.

Joffm

Hello,

I am trying to add a condition where G01Q06 is a question that shows up only if another question before is answered with yes. So I have this equation where it checks if it's not empty the input value can be <= from the two questions input otherwise if it's empty the input only needs to be < than the previous answer.

if( !is_empty(G01Q06), this <= G01Q05 - G01Q06, this < G01Q05)

I'm having an issue where the question G01Q06 doesn't have an input value but the condition doesn't seem to work, as it's not recongnizing that the G01Q06 is empty actually.

I also tried like this, but no luck.

(!is_empty(G01Q06) && this <= G01Q05 - G01Q06) OR (is_empty(G01Q06) && this <G01Q05)

Would appreciate the help, thanks.

Always better to provide a lss export.
Makes everything clearer and easier for us.

Joffm 

Thank you for the quick reply, here is the file. 

Hi,
I wrote before:
No need to use validation equations.
Sufficient to set the max value

"children"


"hh+18"

Here it is
if(!is_empty(G01Q06),G01Q05-G01Q06, G01Q05-1)

 

Why is it necessary to ask "Do you have children Y/N"?
Just ask for the number of children (if there are no, the respondent enters "0")
You avoid the IF and the max value of 18+hh is Q05-Q06.

Joffm
 

Hi,

I need to have the Y/N question since that is required in the survey. I am having an issue with the code you've suggested when the answer is no on that question(so there is no value in G01Q06) and then the condition doesn't work.

nadica123 wrote:

Hi,

I need to have the Y/N question since that is required in the survey. I am having an issue with the code you've suggested when the answer is no on that question(so there is no value in G01Q06) and then the condition doesn't work.
 

@Joffm didn't add NAOK to the value : manual.limesurvey.org/Expression_Manager#Usage_of_NAOK

Correct, "NAOK" was missing.

One other glitch: the max. value of Q06 should be "Q05.1"
And in my opinion better to check for "Q08==2" instead of "is_empty(Q06)"

if(G01Q08==1,G01Q05-G01Q06.NAOK, G01Q05)

Joffm