The event handler method receives the following arguments:
sender
A Calendar instance, which is the source of the event. This object will be passed to the handler function as the first argument.
args
An ItemModifyingEventArgs instance, which contains event data. This object will be passed to the handler function as the second argument.

The following example attaches a handler to the itemDeleting event of a calendar. In the handler method we check if the subject of the item that the user tries to delete is "Math". If yes, we cancel the action.

JavaScript  Copy Code
var p = MindFusion.Scheduling; // attach a handler - when a calendar item is being deleted calendar.itemDeleting.addEventListener(handleItemDeleting); function handleItemDeleting(sender, args) {     //the args.item argument gives information about the item that is being deleted      if(args.item.subject == "Math")           args.cancel = true;       }

Calendar Members
Calendar Class
MindFusion.Scheduling Namespace