The Xerces-J implementation of DOM Events is immature.
> Cast my Document to a DocumentImpl and query for the property
> "MutationEvents"
>
> DocumentImpl documentImpl = (DocumentImpl) document;
> System.out.println("Mutation events = " +
> documentImpl.getMutationEvents());
> documentImpl.setMutationEvents(true);
> System.out.println("Mutation events = " +
> documentImpl.getMutationEvents());
>
> This initially returns 'false', but returns 'true' after I update the
> property.
You shouldn't be required to do this, adding any event listener should be
sufficient to enable mutation events (don't know if that is true or not).
>
> I then created a MutationEvent to find out what the event
> type might be.
>
> Event event = documentImpl.createEvent("MutationEvent");
> System.out.println("Mutation event type = " + event.getType());
>
> I initially used the type "MutationEvents", but that throws a
> DOMException :
> NOT_SUPPORTED_ERR, so I used "MutationEvent" and that seemed
> to work. This
> returns 'null'.
I reported that as bug 1814:
http://nagoya.apache.org/bugzilla/show_bug.cgi?id=1814 My reading of the spec
is that it should be "MutationEvents"
>
> Now I add my event listener to the document.
>
> EventTarget eventTarget = (EventTarget) docSource.toDocument();
> EventListener eventListener = new MyEventListener();
> eventTarget.addEventListener("MutationEvent",
> eventListener, false);
> eventTarget.addEventListener("MutationEvent",
> eventListener, true);
> eventTarget.addEventListener(null, eventListener, false);
> eventTarget.addEventListener(null, eventListener, true);
>
The type argument to addEventListener should be the value of
Event.getType() that you want to catch. For example,
eventTarget.addEventListener("DOMAttrModified",eventListener, false);
> Does anyone have an example of how to catch DOM mutation
> events? Is there a
> way to do it using only the JAXP and DOM interfaces?
I have a series of DOM Events tests that I have been working
on that you can download from the xmlconf CVS.
http://cvs.sourceforge.net/cgi-bin/viewcvs.cgi/xmlconf/domunit/JUNIT/NET/sourceforge/XMLCONF/DOMUNIT/dom2/events/
These all depend on being able to create events using
documentEvent.createEvent("Events") or
documentEvent.createEvent("MutationEvents"), so you have to either munge the
tests or
fix the bug 1814 to even get started.
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