Gets an array (or object or arrays for all targets) with the Sortable Elements in order with all sorting values.
Each target array will consist of objects with the following values:
- depth: An integer of the element, 0 based (0 is root element).
- position An integer of the element position based on 0 (0 is the first element). Child elements do not start at 0 but continues the current sort count.
- id: The element id or sort variable defined by the sort_var option.
- parent: The parent element id or sort variable defined by the sort_var options. This value will be null for root elements.