Validating a select_one list in xlsform

Support
1

Hi Team, I have a list of 10 crops displayed in a select_one. I want to set
a loop (repeat) of 5 times each time allowing a user to pick only one crop
up to five crops.

How can I set a a validation such that a crop selected in the 1st loop
cannot be selected in the 2nd or subsequent loops. I prefer an error
message to warn that the selected had been picked prior.

Thanks.

Collins

2

For things like this, where you have a specific upper bound to the number
of crops (or any other choices) that might be selected, it is best to
"unroll" the loop.

So that you have a flat form with NO repeat groups:

--screen-1--------------------

Select the crops for which you will provide answers, with crop #1 being the
largest cultivated hectares, and crop #5 being the smallest:

Select1 crop #1
select1 crop #2
select1 crop #3
select1 crop #4
select1 crop #5

--screen-2-------------------
Note "You have given the following cultivated hectare ranking for your
crops: <crop#1> ... <crop#5>"

Acknowledge: The crops are listed in the correct order based upon
cultivated hectare (OK)
^--- place the constraint on the crop#1... crop#5 values not being
duplicated on this
Acknowledge widget AND that the user has acknowledged the ordering as
correct.
and have a custom constraint message saying to use the back button to
correct the ordering before continuing.

-----remaining questions----------------------------

question(s) for crop #1
question(s) for crop #2
....
question(s) for crop #5

ยทยทยท ------------------------------------------------- This allows you to enforce some sort of ordering on the crops entered (e.g., by cultivated hectares), have the user confirm this, and then have a flat data record where the first block of responses (for crop #1) have more importance than the 2nd, etc.

On Fri, Feb 14, 2014 at 1:27 AM, Collins McAdoyo collins.adoyo@gmail.comwrote:

Hi Team, I have a list of 10 crops displayed in a select_one. I want to
set a loop (repeat) of 5 times each time allowing a user to pick only one
crop up to five crops.

How can I set a a validation such that a crop selected in the 1st loop
cannot be selected in the 2nd or subsequent loops. I prefer an error
message to warn that the selected had been picked prior.

Thanks.

Collins

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Mitch Sundt
Software Engineer
University of Washington
mitchellsundt@gmail.com