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Re: ID selector via attribute?

From: Ian Hickson <ian@hixie.ch>
Date: Mon, 21 Apr 2003 04:39:27 -0700 (PDT)
To: Tom Gilder <tom@tom.me.uk>
Cc: "www-style@w3.org" <www-style@w3.org>
Message-ID: <Pine.LNX.4.50.0304210432130.9245-100000@dhalsim.dreamhost.com>

On Mon, 21 Apr 2003, Tom Gilder wrote:
>
> Is there a reason why there couldn't be a way to select elmemets by
> IDs, based on an attribute of another element?
>
> For instance, something like (this syntax isn't too good though):
>
>   <label for="me">text</label> <input .. id="me">
>
>   label:focus #attr(for) { color: red; }
>
> ...would make the input red when label is focussed. Would be quite
> handy imo.

At some point in the distant past I proposed the /foo/ combinator. This
would style the above as:

   label:focus /for/ * { color: red; }

...that is, "any element pointed to using the 'for' attribute on an
element whose tag name is 'label' and which is currently focussed".

See part 2 of:
   http://lists.w3.org/Archives/Public/www-style/2000Jan/0152.html

Note that it is unlikely that a "label" element would ever be focussed;
the input element would be instead. The reverse styling (styling the label
based on the focussed input) would be more commonly wanted, I imagine.
This would require the :matches() pseudo-class as well, as in:

   label:matches(# /for/ :focus) { font-weight: bold; }

...which reads "any 'label' element whose 'for' attribute points to an
element that is currently focussed".

-- 
Ian Hickson                                      )\._.,--....,'``.    fL
"meow"                                          /,   _.. \   _\  ;`._ ,.
http://index.hixie.ch/                         `._.-(,_..'--(,_..'`-.;.'
Received on Monday, 21 April 2003 07:38:35 GMT

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