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Re: [selectors-api] What DOM feature "Selectors API" belongs to?

From: Lachlan Hunt <lachlan.hunt@lachy.id.au>
Date: Fri, 15 Feb 2008 00:22:38 +0100
Message-ID: <47B4CD3E.6030804@lachy.id.au>
To: Sam Weinig <weinig@apple.com>
CC: Sergey Ilinsky <castonet@yahoo.co.uk>, public-webapi@w3.org

Sam Weinig wrote:
> Sergey,
>> And as for Safari. Yes, it does have document.querySelector, but! 
>> because of some reason it doesn't have 
>> DocumentSelector/ElementSelector objects exposed, it doesn't return 
>> StaticNodeList from document.querySelectorAll, so, the question is - 
>> does it now support "Selectors API"? Your answer is "yes". mine, 
>> according to your specification - no.
> I am curious as to why think there should be 
> DocumentSelector/ElementSelector objects exposed in a conforming UA.  
> The spec states:

The assumption probably arises from the fact that many of the DOM2 
interfaces, such as Document, Element, Node, etc. are exposed like that. 
  While it makes sense for some of those because, for example, the have 
constants defined for them (e.g. Node.ELEMENT_NODE) or because it allows 
for their prototypes to be extended (e.g. Element.prototype), the value 
of exposing them for selectors api is questionable at best.

> Regarding the returning a StaticNodeList, the implementation in Safari 
> returns an object that implements the StaticNodeList interface, though 
> that happens to be the same as the NodeList interface.  One potential 
> issue here is that we don't expose a StaticNodeList constructor on the 
> window (window.StaticNodeList) but instead use the NodeList's constructor.

Given that, I believe it would be better if the spec was more honest 
about this issue by simply stating that an object implementing the 
NodeList interface is returned, but that the list is not live.  I will 
consider making that change soon.

Lachlan Hunt - Opera Software
Received on Thursday, 14 February 2008 23:22:52 UTC

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