Orbeon forms - repeated section field validation

Question

I have form like this: https://demo.orbeon.com/demo/fr/orbeon/builder/edit/f34f17613d9dbce14bcdf1219b1a7a6babaeebe2

I want to add validation like this:

• only one field 'yes/no' in this section can have selected value 'yes' at the same time
• validation message should appear only under the fields with selected value 'yes'

Should I create some action, that iterate over all 'yes/no' fields, check their value and raise an error if detect above situation?

My main problem is how to iterate over all 'yes/no' fields and detect this situation.

Answer 1

Assuming you name your field yes-no, then the following expression will do it:

string() = 'false' or
count(//yes-no[string() = 'true']) <= 1

With this expression you're saying that an answer is valid if either:

• it is "No", as we don't have any limit on those, or
• there only one "Yes", or less.

And for more on that string() = 'true' business, see Testing on a Yes No Answer field.