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Subject: Re: [office] dynamic updates
- From: Richard Schwerdtfeger <schwer@us.ibm.com>
- To: Robert Weir <robert_weir@us.ibm.com>
- Date: Sun, 8 Jun 2008 12:38:05 -0500
Hi Rob,
Tables now have a dynamic refresh attribute. The specification does not say what the refresh rate metrics are (although I have not looked a the schema yet) and frankly the documentation is a bit thin. However, I believe this means that all data in the table will get refreshed.
Does this not mean that data in spreadsheets gets refreshed and redrawn based on updates from the server?
So, regarding these asynchronous updates it is our assumption that data will get refreshed visually in tables. This is not a lot different than a web page using AJAX to get data updates from a server and refreshing the UI.
So, here is the use case for a user who is blind:
A blind user will operate where they have focus. Data changes may happen in areas of the document outside the current keyboard focus point. We need to tell a screen reader how to convey this information to the user:
- Ignore it
- notify them immediately - an Alert if the data change is really important (In which case an office application may wish to scroll the effected cells into view.
- should the AT process the immediately effected area or the entire area (an entire column of data), etc.
I would think the author may intuitively know this. Here is the section of the WAI-ARIA specifications as it applies to Web 2.0 Rich Internet Applications: http://www.w3.org/WAI/PF/aria/#liveregions
Also, we need to consider update rates. A flash rate of more than 3 times/second can cause seizures.
Rich
Rich Schwerdtfeger
Distinguished Engineer, SWG Accessibility Architect/Strategist
Chair, IBM Accessibility Architecture Review Board
blog: http://www.ibm.com/developerworks/blogs/page/schwer
Robert Weir/Cambridge/IBM@LOTUS
Robert Weir/Cambridge/IBM@LOTUS
06/04/2008 12:22 PM
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Hi Rich,
Where are you seeing dynamic updates? My impression was that the updates were all from the application pulling data from the server. I don't remember seeing anything in ODF where the document could register for change notifications from the database and thereby get asynchronous updates.
-Rob
___________________________
Richard Schwerdtfeger <schwer@us.ibm.com> wrote on 06/02/2008 07:10:39 PM:
> The ODF Accessibility SC would like to know if the ODF TC has
> considered allowing the author to specify how the office application
> should respond to dynamic updates resulting to database connections
> in the document to back end servers:
>
> For example:
> Will some updates require an alert to the user?
> should the update scroll to view?
> Do you want to include meta data for the above to assist the office
> application in determining rendering of the changed data?
>
> These are issues we addressed when addressed in the accessibility of
> rich internet applications when adding live region support to WAI-ARIA.
>
> Rich
>
> Rich Schwerdtfeger
> Distinguished Engineer, SWG Accessibility Architect/Strategist
> Chair, IBM Accessibility Architecture Review Board
> blog: http://www.ibm.com/developerworks/blogs/page/schwer
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