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Re: [dom3core] getAttribute

From: Kasimier Buchcik <K.Buchcik@4commerce.de>
Date: Thu, 01 Dec 2005 10:46:17 +0100
To: Anne van Kesteren <annevk@opera.com>
Cc: ML-www-dom <www-dom@w3.org>
Message-Id: <1133430377.1272.19.camel@librax>

Hi,

On Thu, 2005-12-01 at 10:00 +0100, Anne van Kesteren wrote:
> On Thu, 01 Dec 2005 01:18:54 +0100, Maciej Stachowiak <mjs@apple.com>  
> wrote:
> >> Opera will probably change its behavior to be in line with the above  
> >> mentioned browsers.
> 
> We changed our behavior. (Release is not yet public.)
> 
> 
> > Both "" and null are reasonable things to return for a nonexistent  

If both, "" and NULL would be allowed to be returned, then people would
have to test for both cases to have the code run under any
implementation.

> > attribute, there is no deep principle at stake here. In fact one could  
> > argue that it's better to distinguish empty attribute value from absent  

Returning a NULL when a DOMString is expected is not possible in every
programming language. E.g. Delphi's Strings are not objects and one
cannot return a NULL (or NIL in Delphi) if the return type is a String,
thus you have to return "".

I don't think getAttribute() should be used to test if an attribute
is existent; getAttributeNode() is there for this purpose. Please
don't inject this extra functionality into getAttribute(). I tend to
think that naming this method 'getAttribute' was not the most sensible
thing to do - 'getAttributeValue' or 'getAttributeContent' would have
fitted it better.

> > attribute. So it seems better to update the formal spec to the de facto  
> > standard behavior.

I second Joseph Kesselman's argument; people can use what is already
there to solve this problem:
1) test for attribute node existence with getAttributeNode()
2) retrieve the value with getAttribute() or work on the attribute
   node previously acquired

> Agreed. (Not sure if it can be done though without a DOM WG.)

Regards,

Kasimier
Received on Thursday, 1 December 2005 09:46:30 GMT

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