in one of the following forms:
@H_404_2@labelforvalueinarrayselectaslabelforvalueinarraylabelgroupbygroupforvalueinarrayselectaslabelgroupbygroupforvalueinarraytrackbytrackexprlabelfor(key,value)inobjectselectaslabelfor(key,value)inobjectlabelgroupbygroupfor(key,value)inobjectselectaslabelgroupbygroupfor(key,value)inobjectWhere:
@H_404_2@array/object: an expression which evaluates to an array / object to iterate over.value: local variable which will refer to each item in thearrayor each property value ofobjectduring iteration.key: local variable which will refer to a property name inobjectduring iteration.label: The result of this expression will be the label for<option>element. Theexpressionwill most likely refer to thevaluevariable (e.g.value.propertyName).select: The result of this expression will be bound to the model of the parent<select>element. If not specified,selectexpression will default tovalue.group: The result of this expression will be used to group options using the<optgroup>DOM element.trackexpr: Used when working with an array of objects. The result of this expression will be used to identify the objects in the array. Thetrackexprwill most likely refer to thevaluevariable (e.g.value.propertyName).