How to have gridLayoutHeaderCell in gridlayout ? How to create columns dynamically in a grid ?

Question

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 ?

Richard Michaelis · Answer

Avoid the {} in your a!forEach expression parameter. you are doing a "a!forEach(items:{1,2,3}, expression:{...}) just do a "a!forEach(items:{1,2,3}, expression:...) then it should be fine. 
 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: ""),
 {}
 )
 }
),

Selvakumar Kumarasamy · Answer

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)
 )
 }
 )
 )
 }

How to have gridLayoutHeaderCell in gridlayout ? How to create columns dynamically in a grid ?

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