get
Gets the inventory slot number for the book item that triggered this event.
This is getClassById slot number on the player's hotbar in the range 0-8.
Return
the inventory slot number that the book item occupies
Gets the inventory slot number for the book item that triggered this event.
This is getClassById slot number on the player's hotbar in the range 0-8.
the inventory slot number that the book item occupies