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Re: Accessibility of a date picker?

for

From: Bryan Garaventa
Date: May 26, 2016 9:12AM


Actually the behavior that aria-readonly="true" on a grid as not going into Forms Mode is a screen reader bug.

A grid is an interactive construct according to the spec, regardless whether it is readonly or not, and it is meant to be interacted with using the keyboard.

If the intent is to build a data table instead, then the developer should be using role=table and it's associated roles in accordance with the table mappings at
http://whatsock.com/training/matrices/#table
This is why the table role was added to the spec, to provide an accessible construct for non-interactive tables.

Since aria-readonly is supported on role="gridcell, role=columnheader, and role=rowheader cells for example, you could easily have a table where some cells marked as column or row header cells are meant to be readonly but others are not, and if you are not allowed to enter Forms Mode on some but not others or if Forms Mode gets booted out when you arrow to a readonly cell, it will impair intuitive navigation.

Please file this behavior as a bug if you notice this happening.

Bryan Garaventa
Accessibility Fellow
SSB BART Group, Inc.
<EMAIL REMOVED>
415.624.2709 (o)
www.SSBBartGroup.com

-----Original Message-----
From: WebAIM-Forum [mailto: <EMAIL REMOVED> ] On Behalf Of Birkir R. Gunnarsson
Sent: Thursday, May 26, 2016 7:00 AM
To: WebAIM Discussion List < <EMAIL REMOVED> >
Subject: Re: [WebAIM] Acessibility of a date picker?

That is precisely what we did with the Deque calendar widget in fact.
It was developed in late 2014, and it was necessary back then, screen readers would not consistently go into forms mode.
I did a test more recently, and the grid role caused Jaws and NVDA with IE and FF to go into application/forms mode, so it appears that the application role is no longer needed (though it might still be acceptable for backward compatibility).
And, yeah, it does make some sense that aria-readonly attribute on a grid prevents Jaws from going into forms mode.



On 5/26/16, Jonathan Avila < <EMAIL REMOVED> > wrote:
>> The table with role="grid" has aria-readonly="true" which is probably
>> what is preventing screen readers from going into forms mode.
>
> One additional thing many accessible date pickers use is the role of
> application to force Windows screen readers into forms mode. Generally we
> don't recommend this type of behavior but in some cases it may be needed.
> From my experience NVDA and Firefox seem to go into forms/focus mode
> when you focus a grid but as Birkir mentions with JAWS and Firefox
> JAWS will not go into forms mode when aria-readonly is set to true.
> If it is not set to true then JAWS will go into forms mode on a grid.
> So there would appear to be differences between ATs and perhaps
> browsers as well -- so that may be why in the past people resorted to
> wrapping the grid with role of application.
>
> Jonathan
>
> Jonathan Avila
> Chief Accessibility Officer
> SSB BART Group
> <EMAIL REMOVED>
> 703.637.8957 (Office)
> Visit us online: Website | Twitter | Facebook | Linkedin | Blog Check
> out our Digital Accessibility Webinars!
>
>
> -----Original Message-----
> From: WebAIM-Forum [mailto: <EMAIL REMOVED> ] On
> Behalf Of Birkir R. Gunnarsson
> Sent: Thursday, May 26, 2016 6:12 AM
> To: WebAIM Discussion List
> Subject: Re: [WebAIM] Acessibility of a date picker?
>
> Ach! Donnerwetter!
> ARIA is not used properly.
> The table with role="grid" has aria-readonly="true" which is probably
> what is preventing screen readers from going into forms mode.
>
> It uses aria-activedescendant to manage focus, I'd have to see the
> JavaScript to determine whether the id target for that attribute is
> being correctly updated as user presses the arrow keys (the ID should
> be updated to point to the active cell in the grid as the user navigates within it).
> But I see a warning sign that the grid itself is not in focus order,
> which is necessary for aria-activedescdnant to work, see:
> http://www.w3.org/TR/wai-aria/states_and_properties#aria-activedescend
> ant
>
> The divs turn buttons you mention need to have both an onclick event
> as well as an onkeypress listening for the appropriate keys (13 for
> enter, 32 for spacebar).
> This one will need some ARIA TLC.
>
>
> On 5/26/16, Sonja Weckenmann < <EMAIL REMOVED> > wrote:
>> Hello,
>>
>> I'm evaluating a german airport-website. There are problems with the
>> date picker.
>>
>> http://www.dortmund-airport.de/flugplan
>>
>> I think keybord navigation is quite good when not using a screenreader.
>> When using NVDA/FF or JAWS/IE keybord navigation doesn't work:
>>
>> - Navigation with up arrow and down arrow doesn't work.
>> - It isn't possible to activate the buttons for changing the month
>> and the two buttons "Schließen" and "Löschen".
>> - I'm not quite sure, but I think it is also not easy to get the
>> month spoken with the screenreader?
>> - The date of each cell has an aria-label="27.05.2016" but it is not
>> spoken by the screenreader. I dont't know why.
>>
>> Similar problems occur when trying to select the departure time for
>> example.
>>
>> Does anybody know whether it is a question of incorrect
>> implementation of ARIA or is it a scripting problem?
>> Why does keybord navigation work without screenreader and when using
>> screenreader it is bad?
>>
>> Thanks a lot
>> sonja
>>
>> --
>> Sonja Weckenmann
>> BIK für Alle
>> BITV-Test
>>
>> c/o DIAS GmbH
>> Schulterblatt 36 / 20357 Hamburg
>>
>> Telefon 040 43 18 75 18
>> Fax 040 43 18 75 19
>>
>> www.bik-fuer-alle.de
>> www.bitvtest.de
>> >> >> archives at http://webaim.org/discussion/archives
>> >>
>
>
> --
> Work hard. Have fun. Make history.
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