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Re: ACTION-87: Selectors API

From: Jonas Sicking <jonas@sicking.cc>
Date: Tue, 30 May 2006 15:42:10 -0700
Message-ID: <447CCA42.6000803@sicking.cc>
To: liorean <liorean@gmail.com>
Cc: "Web APIs WG (public)" <public-webapi@w3.org>

liorean wrote:
> On 13/05/06, Anne van Kesteren <annevk@opera.com> wrote:
>> On Sat, 13 May 2006 21:08:26 +0200, liorean <liorean@gmail.com> wrote:
>> > And StaticNodeList looks to me to be pretty array-like.
>> Well, if StaticNodeList looks that way NodeList would look that way too
>> and I'd therefore suggest raising that on www-dom@w3.org instead. Note
>> that I don't really want to be defining StaticNodeList in the first 
>> place.
> Not quite. NodeList are, in some ways, array-like. But StaticNodeList
> is more array-like, for several reasons:
> - First of all, I think StaticNodeList would be implemented as an
> actual list or hash table, not as filters used on the live node tree.
> This specifically because it's not supposed to be affected by changes
> in the node tree. This means they are considerably different under the
> hood.
> - Second, manipulating the DOM using elements gotten from looping
> through a NodeList will have effects on that NodeList during the loop.
> Removals, reparentings, insertions etc, may affect the NodeList.
> StaticNodeList will not be affected by changes to the DOM. This means
> the different mapping functions may have very bizzarre side effects on
> NodeLists that they would not have on StaticNodeLists.
> - Third, NodeLists being live means you cannot manually manipulate
> them. StaticNodeLists don't have this problem. Since they are not
> live, manipulation of them should not be a problem. This means array
> functionality such as sort, push, pop that would simply not make sense
> on a NodeList would make perfect sense on a StaticNodeList.

I don't want us to define a new array when ECMAScript has a perfectly 
good one. That is just a lot more work for everyone involved.

What we could maybe do though is to return a real ECMAScript array. I 
actually like this idea a lot since that'll integrate much better with 
scripts than a StaticNodeList would.

We could define a new top-level object like DOMArray and then let that 
map to different things in ECMAScript and Java.

/ Jonas
Received on Tuesday, 30 May 2006 22:42:16 UTC

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