SP.FieldUser.selectionGroup property (sp.js)
Gets or sets a value that specifies the identifier of the SharePoint group whose members can be selected as values of the field.
Applies to: apps for SharePoint | SharePoint Foundation 2013 | SharePoint Server 2013
var value = SP.FieldUser.get_selectionGroup ()
var value = SP.FieldUser.set_selectionGroup ()
Return value
Type: Number