- From: David Brownell <david-b@pacbell.net>
- Date: Sat, 18 Aug 2001 19:41:24 -0700
- To: Curt Arnold <carnold@houston.rr.com>, www-dom@w3.org
> It would be good to hear the rationale why the behavior in the spec is
> undesirable and get a survey of current implementations.
The "DOM2" implementation, currently hosted as "gnu.xml.dom.*" at
http://www.gnu.org/software/classpathx/jaxp/
scans each node's listeners and collects the ones interested in each
event (so adding listeners to that node during event delivery to it
is a NOP) and then delivers events to all of those.
That is, addition and removal of listeners have comparable behaviors
with respect to a node's "listener set" during event delivery: all such
adds/removes are ignored until the next node's deliveries start.
I tend to think that the spec should require that behavior for removal.
It's more consistent with behavior during addition, so the principle
of least surprises applies. It also reduces per-node costs for event
delivery.
- Dave
p.s. This was probably the first implementation of DOM Level 2
that supported events (yep, months before Xerces). I'm curious:
does anyone recall when that "remove" requirement went in?
I could believe it's always been there, or that it crept in during
some later draft.
Received on Saturday, 18 August 2001 22:42:30 UTC