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Re: Form element dependencies

From: Andrea Rendine <master.skywalker.88@gmail.com>
Date: Wed, 8 Apr 2015 19:47:06 +0200
Message-ID: <CAGxST9=X2K9efZj53Nn1oVLKFqwP4+9x6_NR-SsD=NvkAAQOJw@mail.gmail.com>
To: sisbluesteel <sisbluesteel@aol.com>, "public-html@w3.org LIST" <public-html@w3.org>
Hi there!
I was trying to put together a polyfill for this use case, but I'll have to
set it aside for now, I hope you were luckier.
Just a couple of notes, even if I'm sure you already figured it out:
 - change event does not fire when a radio button is deselected - you'll
have to do it on your own (cycling the change event on all radio buttons
with the same name, I guess)
 - browsers don't support the change event on option elements (IDK why), so
the only viable way to do that is with a framework such as jQuery.

There is also a request for anybody interested, so I'll send this to the
mailing list, too.
My model used @for on controlled elements as stated above (no conflicts on
<output> element, as it cannot be disabled on its own and I only focused on
elements which can be disabled:
'fieldset','input','textarea','select','optgroup','option'). I used it with
multiple IDs separated by whitespace, as an alternative: the element had to
be enabled when any of its controllers was in activated state (checked
radio/checkboxes, selected options), therefore it is @disabled only if all
its controllers are off. Is it the intended behaviour or you'd suggest the
opposite, that is, control enabled only when all its controllers are
activated? (I would not suggest that)

2015-04-02 13:18 GMT+02:00 Andrea Rendine <master.skywalker.88@gmail.com>:

> Good idea.
> Be ready to heavy criticism. In WHATWG you'll find some friction due to
> the difficulties UAs would have in implementing pretty much everything
> (this is somehow funny because a lot of what they define heavily impacts on
> performances).
> I've written a lot in the last month to both WHATWG and W3 and I guess
> everybody can't bear other messages by me, but it doesn't matter, I'll
> support it anyway.
> I hope for the best.
> 2015-04-02 11:42 GMT+02:00 sisbluesteel <sisbluesteel@aol.com>:
>> Okay,
>> I'm going to send the proposal to whatwg mailing list sometime soon. I'll
>> use discussion done here as a reference and probably implement a light
>> prototype in JS as well.
>> On April 2, 2015 5:23:34 AM EEST, Andrea Rendine <
>> master.skywalker.88@gmail.com> wrote:
>>> Hey everybody!
>>> Has there been any evolution about this subject?
>>> Days ago I sent a message but it never reached the list. In short:
>>> The focus for dependency attribute and "directionality" is to choose
>>> ease of implementation or readability.
>>>  - if @for is specified on the controller, then I think that it would be
>>> easier for user agents to identify the state change action.
>>>  <controller@for> -> identify controlled (depending) element(s) ->
>>> controller state change -> toggle controlled element's state
>>>  - on the other hand, specifying it on controlled elements (depending)
>>> makes the code more readable, I see an element and I know what controls it
>>> relies on.
>>> It'd be also useful to know if there are custom scripts (plugins etc)
>>> which do it as of now and how they work.
>>> These are some examples:
>>> http://dstreet.github.io/dependsOn/ - here the relationship starts from
>>> controlled and the function specifies what elements the controlled relies
>>> upon
>>> https://github.com/keyo/jQuery-Form-Dependency - more complex syntax,
>>> but same as above. The rule specifies what element's state to watch in
>>> order to enable/disable behaviors
>>> http://www.alpacajs.org/releases/1.1.3/examples/components/dependency/dependency-field.html<
>>> /a> - same here, the depending elements are specified before the element to
>>> be watched.
>>> <http://www.alpacajs.org/releases/1.1.3/examples/components/dependency/dependency-field.html>
>>> Then it looks like community goes this way.
>>> I'd suggest some other ways to propose this feature:
>>>  - https://www.w3.org/community/webed/wiki/HTML5_form_additions (page
>>> or discussion), but I don't know how often it is watched
>>>  - WHATWG mailing list (whatwg@whatwg.org), similar to this but
>>> regarding Web Hypertext Application Technology Working Group
>>>  - https://wiki.whatwg.org/wiki/IRC WHATWG Freenode channel (requires
>>> more dedication)
>>>  - WHATWG wiki proposals (https://wiki.whatwg.org/wiki/Feature_Proposals)
>>> - also worth noting this page for suggestions about proposing stuff:
>>> http://wiki.whatwg.org/wiki/FAQ#Is_there_a_process_for_adding_new_features_to_a_specification.3F
>>> Yours respectfully and supportingly
>>> Andrea
>> --
>> Sent from my Android device with K-9 Mail. Please excuse my brevity.
Received on Wednesday, 8 April 2015 17:47:34 UTC

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