Re: sXBL issue -- bindings getting notified when the bound element is inserted into a document

Hi Boris.

Boris Zbarsky:
> I made an attempt to design things using DOMNodeInsertedIntoDocument, and 
> discovered two major problems.  First, and less importantly, event firing 
> order in the DOM spec is badly underdefined (so it's not clear in which 
> order DOMNodeInsertedIntoDocument is fired on the nodes of a subtree that's 
> inserted into the document).  Second, it's possible for 
> DOMNodeInsertedIntoDocument to fire on a node that's not in the document 
> anymore.

While I think it would be nice to have the implementation completely in
terms of standard DOM event handling (and I'm trying to use it as much
as I can), I don't think it is possible.  You also won't be able to use
DOMNodeInsertedIntoDocument to handle new bindable elements being
inserted into shadow trees, since techinically these aren't a part of
the document tree.

So I went for using DOMNodeInserted events.  But still, DOMNodeInserted
events will be stopped when they cross shadow scopes.  I ended up having
an addUnstoppableEventListenerNS method (which wouldn't be exposed
outside of the implementation) to allow capturing DOMNodeInserted events
that otherwise would have been stopped.  I'm not completely happy with
that approach, but I thought it best to utilise the standard event
processing as much as possible.

Is there some requirement in Mozilla for the sXBL functionality to be
kept completely separate from the DOM3 code?  If not, then of course
you can do whatever you want (intercept appendChild et al) and handling
binding at that point.

Cameron

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