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CHAPTER 4: User-Interface Tools Event handling 149

Event handling

Several helper classes provide low-level event-handling capabilities.

X Event objects are normally created by ScriptUI and passed to your event handler. However, you can

simulate a user action by constructing an event object using

ScriptUI.events.events.createEvent(),

and sending it to a target object’s dispatchEvent()

function.

X A helper object, Keyboard state object, provides global access to the keyboard state during function

execution, outside the event-handling framework.

UIEvent base class

Encapsulates input event information for an event that propagates through a container and control

hierarchy. This is a base class for the more specialized KeyboardEvent object

and MouseEvent object.

UIEvent object properties

Both keyboard and mouse events have these properties.

bubbles

Boolean When true, the event supports the bubbling phase.

cancelable

Boolean When true, the handler can call this object’s preventDefault() method to

cancel the default action of the event.

currentTarget

Object The element object where the currently executing handler was registered.

This could be an ancestor of the target object, if the handler is invoked

during the capture or bubbling phase.

eventPhase

Number Current event propagation phase. One of these constants:

Event.NOT_DISPATCHING

Event.CAPTURING_PHASE

Event.AT_TARGET

Event.BUBBLING_PHASE

target

Object The element object where the event occurred.

timeStamp

Object Time the event was initiated. A JavaScript Date object.

type

String The name of the event that occurred. Predefined events types are:

change changing

move moving

resize resizing

show enterKey

focus blur

Additional type names apply specifically to keyboard and mouse events.

view

Object The container or control object that dispatched the event.

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