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Re: [css4-selectors] Focused descendant pseudo class

From: Daniel Tan/BoltClock <lists@NOVALISTIC.com>
Date: Thu, 26 Jan 2012 04:33:33 +0800
Message-ID: <4F20671D.8060909@NOVALISTIC.com>
To: Lea Verou <leaverou@gmail.com>
CC: Rudolph Gottesheim <r.gottesheim@loot.at>, www-style@w3.org
On 1/26/2012 3:58 AM, Lea Verou wrote:
> On 25/1/12 21:45, Rudolph Gottesheim wrote:
>> A while ago I asked[1] the www-style list for a solution to selecting
>> the parent of a focused form input, which (once again) kicked off the
>> discussion about a parent selector (which is still no option, as far as
>> I can tell).
>>
>> Now I've come across another use case and probably another solution to
>> the same problem:
>>
>> Suppose you have a form with a text input and a submit button. Now you
>> want to hide the submit button to un-clutter the interface, but show it
>> as soon as the user focuses the input element.
>>
>> <form>
>> <input />
>> <input type=submit />
>> </form>
>>
>> form input[type=submit] {
>> display: none;
>> }
>>
>> Would it be possible to implement a "some descendant of this element is
>> in focus" selector? Something like :focused-child oder :contains-focus.
>>
>> form:contains-focus input[type=submit] {
>> display: block;
>> }
>>
>> [1] http://lists.w3.org/Archives/Public/www-style/2011Oct/0275.html
>>
>
> AFAIK the WG is planning to explore a way to set a different subject for
> a selector by appending an exclamation mark (!) after it [1] in
> Selectors 4.
>
> So your case would be form! input[type=submit]:focus { ... }
>
> [1]: http://dev.w3.org/csswg/selectors4/#subject
>

I don't think that's what he meant.

The way I see it, he's asking to apply the style to the submit input if 
any of the form's descendants have focus. What your rule is doing is 
applying the style to the form if the submit input has focus.

-- 
Daniel Tan/BoltClock
NOVALISTIC • Stellar Software Development & Design
<http://NOVALISTIC.com>
Received on Wednesday, 25 January 2012 20:34:09 GMT

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