2.1.6 [DOM Level 2 - Events] Section 1.4, Event interface

V0016:

The specification states:

 The Event interface is used to provide contextual information about an event to the 
 handler processing the event. An object which implements the Event interface is 
 generally passed as the first parameter to an event handler. More specific context 
 information is passed to event handlers by deriving additional interfaces from 
 Event which contain information directly relating to the type of event they 
 accompany. These derived interfaces are also implemented by the object passed to 
 the event listener.

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The Event interface is not supported.

V0017:

The specification states:

 Definition group PhaseType
 An integer indicating which phase of event flow is being processed.
  
 Defined Constants
 AT_TARGET
 The event is currently being evaluated at the target EventTarget.
  
 BUBBLING_PHASE
 The current event phase is the bubbling phase.
  
 CAPTURING_PHASE
 The current event phase is the capturing phase

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The PhaseType definition group is not supported.

V0018:

The specification states:

 Attributes
 bubbles of type boolean, readonly
 Used to indicate whether or not an event is a bubbling event. If the event can 
 bubble the value is true, else the value is false.
  
 cancelable of type boolean, readonly
 Used to indicate whether or not an event can have its default action prevented. If 
 the default action can be prevented the value is true, else the value is false.
  
 currentTarget of type EventTarget, readonly
 Used to indicate the EventTarget whose EventListeners are currently being 
 processed. This is particularly useful during capturing and bubbling.
  
 eventPhase of type unsigned short, readonly
 Used to indicate which phase of event flow is currently being evaluated.
  
 target of type EventTarget, readonly
 Used to indicate the EventTarget to which the event was originally dispatched.
  
 timeStamp of type DOMTimeStamp, readonly
 Used to specify the time (in milliseconds relative to the epoch) at which the event 
 was created. Due to the fact that some systems may not provide this information the 
 value of timeStamp may be not available for all events. When not available, a value 
 of 0 will be returned. Examples of epoch time are the time of the system start or 
 0:0:0 UTC 1st January 1970.
  
 type of type DOMString, readonly
 The name of the event (case-insensitive). The name must be an XML name.

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The following attributes are not supported:

  • bubbles

  • cancelable

  • currentTarget

  • eventPhase

  • target

  • timeStamp

The following attribute is supported:

  • type

V0019:

The specification states:

 initEvent
 The initEvent method is used to initialize the value of an Event created through 
 the DocumentEvent interface. This method may only be called before the Event has 
 been dispatched via the dispatchEvent method, though it may be called multiple 
 times during that phase if necessary. If called multiple times the final invocation 
 takes precedence. If called from a subclass of Event interface only the values 
 specified in the initEvent method are modified, all other attributes are left unchanged. 
  
 Parameters 
 eventTypeArg of type DOMString
 Specifies the event type. This type may be any event type currently defined in this 
 specification or a new event type.. The string must be an XML name.
 Any new event type must not begin with any upper, lower, or mixed case version of 
 the string "DOM". This prefix is reserved for future DOM event sets. It is also 
 strongly recommended that third parties adding their own events use their own 
 prefix to avoid confusion and lessen the probability of conflicts with other new events.
  
 canBubbleArg of type boolean
 Specifies whether or not the event can bubble.
  
 cancelableArg of type boolean
 Specifies whether or not the event's default action can be prevented.
No Return Value
 
No Exceptions

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The initEvent method is not supported. Similar functionality is provided by the createEventObject( [oExistingEvent]) scripting method.

Parameter:

oExistingEvent Optional. An object that specifies an existing event object on which to base the new object.

Return Value:

Returns an event object.

Event object properties are read-only after the fireEvent method is called.

V0020:

The specification states:

 preventDefault
 If an event is cancelable, the preventDefault method is used to signify that the 
 event is to be canceled, meaning any default action normally taken by the 
 implementation as a result of the event will not occur. If, during any stage of 
 event flow, the preventDefault method is called the event is canceled. Any default 
 action associated with the event will not occur. Calling this method for a non-
 cancelable event has no effect. Once preventDefault has been called it will remain 
 in effect throughout the remainder of the event's propagation. This method may be 
 used during any stage of event flow. 
  
 No Parameters
  
 No Return Value
  
 No Exceptions

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The preventDefault method is not supported. Similar functionality is provided by the returnValue property.

V0021:

The specification states:

 stopPropagation
 The stopPropagation method is used prevent further propagation of an event during 
 event flow. If this method is called by any EventListener the event will cease 
 propagating through the tree. The event will complete dispatch to all listeners on 
 the current EventTarget before event flow stops. This method may be used during any 
 stage of event flow. 
  
 No Parameters
  
 No Return Value
  
 No Exceptions

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The stopPropagation method is not supported. Similar functionality is provided by the cancelBubble property.

V0022:

The specification states:

 Event operations may throw an EventException as specified in their method descriptions.
 IDL Definition
 // Introduced in DOM Level 2:
 exception EventException {
   unsigned short   code;
 };
 // EventExceptionCode
 const unsigned short      UNSPECIFIED_EVENT_TYPE_ERR     = 0;

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Exception handling is not supported. Error objects and JavaScript Error objects are supported.

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