Add extended dragging functionality with droppable option. Data
can be attached to the element in order to specify its duration
when dropped. A
Duration-ish value can be provided.
This can either be done via jQuery or via an
data-duration attribute. This option operates with jQuery UI draggables.
download the appropriate jQuery UI files
and initialize a
draggable element. Additionally,
you must set the calendar's
droppable option to