Checkbox inside Hamburger Button

Question

Is it possible to fold options in checkboxField inside Hamburger like button (to have the behavior of dropdown) in Appian?

Chris · Answer

You can combine a!richTextDisplayField() and a!checkboxField() to achieve a similar result, where the checkboxes show under the buttons when clicked. It would require a re-click on the buttons to hide the checkboxes however, vs a javascript type setup where they auto-collapse by clicking elsewhere randomly on the form, or as popups that do not expand the form. 
 Some sample code: 
 a!localVariables(
 local!options: {"Option 1","Option 2","Option 3"},
 local!data: {
 {visible: false, selected: null},
 {visible: false, selected: null},
 {visible: false, selected: null}
 },
 
 a!forEach(
 items: local!data,
 expression: {
 a!richTextDisplayField(
 labelPosition: "COLLAPSED",
 value: {
 a!richTextIcon(
 icon: "ellipsis-v",
 link: a!dynamicLink(
 saveInto: a!save(local!data[fv!index].visible,not(fv!item.visible))
 )
 )
 }
 ),
 a!checkboxField(
 labelPosition: "COLLAPSED",
 showWhen: fv!item.visible,
 choiceLabels: local!options,
 choiceValues: local!options,
 value: if(
 rule!APN_isEmpty(fv!item.selected),
 null,
 split(fv!item.selected,";")
 ),
 saveInto: a!save(local!data[fv!index].selected,joinarray(save!value,";"))
 )
 }
 )
)