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Re: DOM Events

From: Jean-Yves Bitterlich <Jean-Yves.Bitterlich@Sun.COM>
Date: Wed, 11 Apr 2007 10:12:18 +0200
To: public-webapi@w3.org
Message-id: <461C9862.9080909@sun.com>
Stewart:

Here an example of an application defining an event, where canDispatch 
returns 'false'  (at least in our interpretation of the current 
specification)

[it's java :-)]
-----------------------------------------
DocumentBuilderFactory docBF = DocumentBuilderFactory.newInstance();
Document document = docBF.newDocumentBuilder().newDocument();

if (document.getImplementation().hasFeature("Events", "2.0")) {
  DocumentEvent docEvent = (DocumentEvent)document.getFeature("+Events", 
"2.0");
  EventListener el = new EventListener(){public void handleEvent(Event 
evt){}};

  CustomEvent event = (CustomEvent)docEvent.createEvent("CustomEvent");
  event.initCustomEventNS(null, "myType", true, true, "myCustomEvent");
      
  ((EventTarget)document).addEventListenerNS(event.getNamespaceURI(), 
event.getType(), el, false, null);
  ((EventTarget)document).dispatchEvent(event);
          
  if(!docEvent.canDispatch(event.getNamespaceURI(), event.getType())) {
    /* here: canDispatch()=false ... do we really want this being 
false?!?! */
    System.out.println("DocumentEvent.canDispatch(...) returns false.");
  }
}
-----------------------------------------
the point/confusion being here that this method returns false for all 
events with namespaceURI that doesn't equal null. It happens for 
CustomEvents with namespaceURI that equals null also. But all such 
events should be generated and dispatched correctly. Again (our feeling) 
is that the specification sounds like the implementation 
cannot/should-not dispatch application specific events.



-- 
Jean-Yves Bitterlich, Sun Microsystems GmbH, Sonnenallee 1, 85551 
Heimstetten, Germany


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Received on Wednesday, 11 April 2007 08:12:23 GMT

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