gridRowLayout conditionl contents

Question

Hi,
Is there any way to display textField/radioButtonField 's in gridRowLayout based on satisfying given condition ? I have a column, it can be of either dropdown or text field or radiobutton. Type of row has to be decided based on column header selection (column header selection happens dynamically). I have tried using required option but its not working. 
 a!gridRowLayout( contents: { a!dropdownField( labelPosition: "COLLAPSED", placeholder: "Please select one", choiceLabels: {"A","B","C","D"}, choiceValues: {"A","B","C","D"}, value:"", saveInto: a!save(ri!answerList.answerValue,save!value), required: exact(fv!item.type = "grid",true(),false()), disabled: rule!APN_isTrue(ri!isReadOnly) ),  a!radioButtonField( value: "", choiceLabels: {"False", "True"}, choiceValues: {false, true}, saveInto: a!save(local!gridQuestionsList.defaultAnswer,save!value), required: if(fv!item.type = "radio button",true(),false())
)
}
)

stewart.burchell · Answer

the 'required' attribute simply forces the user to enter a value. If you want the component to be invisible based upon some criteria then you should use the 'showWhen' attribute which takes a Boolean value.

Note also that you do not need to construct your code as:

if(fv!item.type = "radio button",true(),false())

...since just having:

fv!item.type = "radio button"

will return either "true" or "false".

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