Olli Pettay ha scritto:
On 11/25/2008 11:17 PM, Calogero Alex Baldacchino wrote:
> Maybe, the standard behaviour (for both 'display:none' and
> 'visibility:hidden') could be just focusing (and changing visibility)
> after pressing the access key (so the user notices what's happening
> before activating any 'control'), then activating the element after a
> second press.
>
That isn't what any of the browsers do currently, so I'm not in favor of
this pretty strange behavior.
And how could the browser know how to change the display value?
From display:none to display:inline or display:block or
display:inline-block or what?
Maybe I've replied to quickly, sorry for this. The user agent should
have a default style sheet with a default display value for each
element, so that value could apply (this may lead to unwanted results if
the element had a different display value before the value "none" was
set, and this case should be handled by script). I guess what you wish
is something like a shortcut in a desktop application, letting you
access any control in a menu without showing and esploring the menu.
Despite this could be a desireable behaviour for a web application, I
think it could also be used to trick the user, or cause an unwanted
operation to be performed as a consequence of a casual key pressing,
thus the idea of showing the control before activating it, giving the
user a chance to stop the operation. For the possible tricks, I guess
that might be a minor concern (since there are far 'better' ways to
compromise your navigation); anyway, consider that an element constraint
with 'display:none' is not a part of the formatting structure for any
media and you cannot access it anyway (i.e. you cannot click on it, you
cannot reach it by pressing the tab key). That's not just invisible,
that's not presented to you at all, almost if that wasn't in the
document tree, so that's not focusable at all, and accessing it through
an access key would be quite a tricky way to bypass the above
'restrictions' (as if that was forced into the document layout). A
better way to do what you aim would consist of setting a listener for
key events on a displayable element and choosing a different operation
basing on the pressed key(s); a perhaps tricky alternative would be
using controls with an accesskey attribute properly set and 'emulating'
the 'display:none' layout property by setting their width, height,
margin, etc., to a value of zero, and their display property to the
'inline' value. I guess any browser allowing the behaviour you ask for
any element with a 'display:none' value perhaps just works around a
somewhat misuse of the display property as a quirk.
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