Inserts a item or items before item with id=before
insert(before, items)
before string, id of item to insert before
items object or array, item or array of items
Returns undefined.

Description

New items will be inserted before item with id = before. If before is null, new items will be appended at the end. The items argument can be either an object or array of objects. If it is an object it represents an item that will be added to .items array. If it is an array then each element of the array will be treated as a separate item object.
If you have listview defined in the following way: You can add items: