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Re: xforms-value-changed event

From: Erik Bruchez <ebruchez@orbeon.com>
Date: Mon, 19 Oct 2009 10:07:15 -0700
Message-ID: <e81b48eb0910191007n6f25e8b7s280b92e9df2c3722@mail.gmail.com>
To: www-forms@w3.org, public-forms@w3.org
Vlad,

I am glad you are raising this. UI events in XForms must undergo a
thorough review. It would be great if you could look at our draft
proposal here:

http://wiki.orbeon.com/forms/doc/developer-guide/xforms-refresh-events

-Erik

On Mon, Oct 19, 2009 at 9:36 AM, Vlad Trakhtenberg <vladt@ca.ibm.com> wrote:
> Dear WG,
>
> The XForms 1.1 spec defines :
>
> 4.4.3 The xforms-value-changed Event
>
> Dispatched in response to: a change to an instance data node bound to a core
> form control.
> Target: Core Form Controls
> ...
>
> At the same time the section 8.1.1 has this language:
>
> ...
> When a non-relevant form control changes to being relevant, the XForms
> action handlers that listen for events on the form control must become
> enabled and then the form control must be updated to represent the current
> value(s) and model item properties of the instance node(s) to which it is
> bound or to which it refers. The following events must be dispatched to the
> form control: xforms-enabled, xforms-value-changed, ...
>
> Which means, in particular, that the xforms-value-changed event must be
> dispatched with or without change to it's bound instance data node.
>
> And finally, if a form control bound instance node itself changes  - say as
> result of a change in predicate, use of a choose() function or insert/delete
> - and the new bound node's value is different from the value of the 'old
> bound node, the xforms-value-changed (and respective derivative events, like
> xforms-valid, etc.) is not supposed to be dispatched. This, arguably, makes
> it hard for form authors to trap changes that directly or indirectly affect
> the UI.
>
> These problems may have been discussed few times already, Hopefully, the
> next XForms revision will address them  - especially the last concern
>
> Thanks,
> Vlad Trakhtenberg,
> IBM, Victoria Software Lab
Received on Monday, 19 October 2009 17:08:12 UTC

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