Stream: questionnaire
Topic: calculatedExpression & type
Paul Lynch (Apr 23 2021 at 23:19):
Is it documented someplace that the result of a calculatedExpression should agree with item.type, and what the behavior should be if it doesn't? I couldn't find it.
Lloyd McKenzie (Apr 24 2021 at 15:41):
Probably not defined - care to create a change request?
Paul Lynch (Apr 26 2021 at 18:30):
Ephraim Kigamba (Jun 07 2021 at 14:50):
Hey @Lloyd McKenzie , can calculatedExpression be used to copy the value/answer of another item?
Lloyd McKenzie (Jun 07 2021 at 14:51):
Yes, though you might also need variable, depending on the relative location.
Ephraim Kigamba (Jun 08 2021 at 09:46):
Thanks @Lloyd McKenzie Do you have a quick example where variable would be needed?
Lloyd McKenzie (Jun 08 2021 at 13:27):
calculatedExpression will only have access to descendant items. If the item you want to copy is a sibling or ancestor, you'll have to capture the value in a variable to be able to reference it with calculatedExpression in the current item.
Ephraim Kigamba (Jun 08 2021 at 13:30):
Oh! Cool. Now I get you
Paul Lynch (Jun 08 2021 at 15:24):
Lloyd McKenzie said:
calculatedExpression will only have access to descendant items. If the item you want to copy is a sibling or ancestor, you'll have to capture the value in a variable to be able to reference it with calculatedExpression in the current item.
@Lloyd McKenzie I don't think that is correct, in general. An Expression can access anything in the Questionnaire/QuestionnaireResponse via %questionnaire and %resource. However, if you are dealing with an Expression in a repeating group, you can't find the correct repetition that way, and need to rely on %context, which limits you to the item and its children. In that case you would want a variable on the repeating group.
Ephraim Kigamba (Jun 08 2021 at 15:29):
@Paul Lynch Noted. Thanks for the clarification.
Last updated: Apr 12 2022 at 19:14 UTC
