I am trying below code. Here, expression rule GPO_questionDetails returns a list for a given number.a!gridLayout( label:"program",headerCells: { a!forEach( items: {"230108","230109","230110"}, expression:{ a!localVariables( local!list: rule!GPO_questionDetails(questionID: fv!item), a!gridLayoutHeaderCell(label: local!list.label) )} ), if(not(rule!APN_isTrue(ri!isReadOnly)),a!gridLayoutHeaderCell(label: ""),{}) },Error: Could not display interface. Please check definition and inputs. Interface Definition: Expression evaluation error at function a!gridLayout [line 35]: A grid component [label="program"] has an invalid value for "headerCells". "headerCells" can only be of type GridLayoutHeaderCell. Received List of GridHeaderCell at index 1.Can some one help me to fix this ?
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Hi,
Using a flatten() function will help you in this case:
headerCells: { a!flatten( a!forEach( items: { "230108", "230109", "230110" }, expression: { a!localVariables( local!list: fv!item, a!gridLayoutHeaderCell(label: local!list) ) } ) ) }
btw this solves the issue too ;)