Checkbox field error

Question

I've been trying to implement a checkbox field but keep receiving an error. I can select either choice. I can select nothing. But if I select both choices, I get the following error: 
 Could not display interface. Please check definition and inputs. Interface Definition: Expression evaluation error at function a!checkboxField [line 638]: A checkbox component [label=""] has an invalid value for "value". All selected values must be present in the choiceValues array, but value was Fatality; Serious Injury and choiceValues was Fatality; Serious Injury. 
 For reference, this is the code I am using:

What am I doing wrong?

Stefan Helzle · Answer

Storing multiple values in one field is a dangerous design decision. If this is what you want/need, you can use something like this: 
 a!localVariables(
 local!boxValue,
 a!checkboxField(
 choiceLabels: {"Option 1", "Option 2"},
 choiceValues: {1, 2}, /* Integers here */
 label: "Checkboxes",
 labelPosition: "ABOVE",
 saveInto: a!save(
 target: local!boxValue,
 value: joinarray(a!defaultValue(save!value, {}), ";")
 ),
 value: if(
 a!isNullOrEmpty(local!boxValue),
 null,
 tointeger(split(local!boxValue, ";")) /* Integers here */
 ),
 validations: {}
 )
) 
 An alternative is, to store the values in JSON format using toJson() and fromJson().

Vyshnavi Naripeddi · Answer

Hi Marco Tacca 
 The issue is because you are trying to save multiple values in a single field. If you want to select multiple values the value must be a type of array. 
 a!localVariables(
 local!data:{},
 a!checkboxField(
 label:"Skills",
 choiceLabels: {"C","C++",".net","java","appian"},
 choiceValues: {"C","C++",".net","java","appian"},
 value: local!data,
 saveInto: local!data
 )
)

Checkbox field error

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