Event Object

The Event object (handler gets passed) has properties:
- type: event type.
- target: node on which event occurred.
- currentTarget: node at which event is currently being processed.
- eventPhase: number that specifies current phase of event propagation.
- timeStamp: a Date object of when the event occurred.
- bubbles: does this event bubble up?
- cancelable: does it have a default action that can be canceled with the preventDefault() method?
UIEvent inherits from Event and has (in addition):
- view: window object within which the event occurred.
- detail: number with more info. For clicks its 1 for single click, 2 for double click, 3 for triple.
MouseEvent inherits from both.
- button: number of button pressed (0,1,2)
- alkKey, ctrlKey, metaKey, shiftKey: booleans. Was it held down?
- clientX, clientY: coordinates of mouse relative to browser window.
- screenX, screenY: coordinates of mouse relative to screen.
- relatedTarget: for mousemovement events it is the node the mouse left.