On 2011-11-25 01:07, Sean Hogan wrote:
On 24/11/11 7:46 PM, Lachlan Hunt wrote:
On 2011-11-23 23:38, Sean Hogan wrote:
- If you want to use selectors with :scope implied at the start of each
selector in the selector list (as most js libs currently do) then you
use find / findAll / matches.
The matches method will not change behaviour depending on whether or
not there is an explicit :scope because it is always evaluated in the
context of the entire tree. There is never an implied :scope inserted
into the selector, so there will not be two alternative matches methods.
If and when there is a need for a matching method that does imply :scope
(which I provided a use-case for in
http://lists.w3.org/Archives/Public/public-webapps/2011OctDec/0342.html)
then it could be called matches().
Oh, it wasn't clear that you were talking about a case involving
explicit reference nodes before.
But adding two separate methods that are only subtly different would add
more complexity for authors, since the difference will not always be
obvious where there is no explicit reference nodes supplied and they may
get them confused.
In fact, with a method that always prepends :scope, it could result in
an unexpected result in some cases:
e.g.
root.matches("html.foo");
root.matchesSelector("html.foo");
These aren't obviously different, but when you consider that the first
would always prepend :scope under your proposal, the first would
unexpectedly return false, since it's equivalent to:
root.matchesSelector(":scope html.foo");
This would happen whether the root element is the root of the document,
or the root of a disconnected tree.
We could instead address your use case by implying :scope if a
refElement or refNodes is supplied. That way, if the author calls
.matches() without any refNodes, they get the expected result with no
implied :scope. If they do supply refNodes, and there is no explicit
:scope, then imply :scope at the beginning.
This approach would be completely backwards compatible with the existing
implementations, as nothing changes until refNodes/refElement and :scope
are supported.
--
Lachlan Hunt - Opera Software
http://lachy.id.au/
http://www.opera.com/
