Re: Is there a public list of events that should fire when ARIA is used?

Hi Dominic,

I don't believe and event fires for that. That said, with MSAA/IA2 you will
get a relation set and an accDescription applied. So, only the description
change event is really necessary. I don't believe we created a describedby
event change for just the reason you highlighted. Descriptions constitute
secondary information and are not typically spoken automatically.

Rich


Rich Schwerdtfeger



From: Dominic Mazzoni <dmazzoni@google.com>
To: Bryan Garaventa <bryan.garaventa@ssbbartgroup.com>
Cc: "public-pfwg@w3.org" <public-pfwg@w3.org>
Date: 02/22/2015 12:19 PM
Subject: Re: Is there a public list of events that should fire when ARIA
            is used?



If the description is exposed in the "description" field when you explore
it with a MSAA tool, then EVENT_OBJECT_DESCRIPTIONCHANGE would be the event
that should fire.

However, if aria-describedby points to another element with visible text on
the page, then it's exposed via IAccessibleRelation with the code
IA2_RELATION_DESCRIBED_BY. I can't find an event that's supposed to fire if
that property changes. Maybe someone else knows?

In either case, it's not clear to me that dynamically changing the
accessible description - by any means - should necessarily cause a screen
reader to speak the description. In general the only standard way to get a
screen reader to speak something asynchronously (i.e. not in response to a
user event) is with a live region. Any other case where it speaks something
is typically dependent on the screen reader and not standardized.

- Dominic

On Sat, Feb 21, 2015 at 3:39 PM, Bryan Garaventa <
bryan.garaventa@ssbbartgroup.com> wrote:
  I do have one question though, it looks like aria-describedby isn’t
  listed as firing any event when changed programmatically. Does this
  actually fire any event when this occurs?





  I’m referring to the scenario when an element has focus, such as a form
  field, and within a certain time delay (e.g 1.5 seconds), a tooltip is
  programmatically displayed by inserting it into the DOM, where
  aria-describedby is then set on the element that has focus to point to
  the newly displayed tooltip.





  This scenario would also occur for dynamically updating tooltips, such as
  when typing into a form field that rendered different tooltips as you
  type in order to shape the user’s input responses.





  Does the modification of aria-describedby then fire a specific event when
  this occurs?











  From: Dominic Mazzoni [mailto:dmazzoni@google.com]
  Sent: Friday, February 20, 2015 11:24 PM
  To: Bryan Garaventa
  Cc: public-pfwg@w3.org
  Subject: Re: Is there a public list of events that should fire when ARIA
  is used?





  Hi Bryan,





  The WAI-ARIA User Agent Implementation Guide includes a section on what
  events are supposed to be fired in response to ARIA changes:
  http://www.w3.org/TR/wai-aria-implementation/#mapping_events






  If you're testing IE, the table should be sufficient. However if you're
  testing Firefox or Chrome, I'm not sure you can use Accessible Event
  Watcher because I think it only knows about MSAA and UIA events, but
  Firefox and Chrome also send IAccessible2 events.





  - Dominic





  On Fri, Feb 20, 2015 at 9:10 PM, Bryan Garaventa <
  bryan.garaventa@ssbbartgroup.com> wrote:


  Hi,
  Hopefully somebody can point me in the right direction here.

  I'm experimenting with Accessible Event Watcher, at
  https://msdn.microsoft.com/en-us/library/windows/desktop/dd317979%28v=vs.85%29.aspx


  In order to get a better understanding of which events fire when ARIA is
  used on the Windows OS, and when this happens such as when various
  properties and states change during interaction.

  However, I'm not sure which events I should be checking for, what their
  names are, and which ARIA changes should be triggering these.

  Is there a public list of events somewhere that describes which events
  should fire and when that I could review in order to understand these
  things better? I expect this may be platform specific, but any resource
  would be helpful.

  Thanks,
  Bryan