When can AVTs be used?

Hi,

From the documentation at
http://wiki.orbeon.com/forms/doc/developer-guide/xforms-attribute-value-templates
I get the impression that Attribute Value Templates (AVTs) can be used
on any xhtml element attribute,
with the exception of id.

Within the xforms elements it seems that only the attributes listed
can be controlled by AVTs.

AVTs do not appear to work in the xxforms:dialog.
The following does not work (the dialog is draggable).

         <xxforms:dialog id="dia-map" draggable="{false()}" >


Have I understood the documentation correctly?

Is it planned to enable AVTs for all attributes, in any element and
including id attributes?

thanks
Tim




--
Tim Pizey
Centre for Genomics and Global Health <http://cggh.org>
The Wellcome Trust Centre for Human Genetics
Roosevelt Drive
Oxford
OX3 7BN
United Kingdom
Web: http://pizey.net/~timp
Tel: +44 (0)1865 287532


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Hi Tim,

Do you want the draggable feature to be run-time configurable?

(I presume it supports "true" and "false" which, along with
1 and 0 are compatible representations for the values returned
by the XPath functions true() and false() )

I suspect it won't be possible to enable AVT on all elements
because the dependency issues when changes to model data occur.

They certainly can simplify coding, but I imagine they could
create feedback-like dependencies if they were available
everywhere.

Cheers,
Hank


Quoting Tim Pizey <[hidden email]>:


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Hank Ratzesberger
[hidden email]



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Tim,

I think you read the doc right.

xxforms:dialog/@draggable is not listed, which indicates that it won't
work (unless we forgot to add this to the doc of course, but I can
confirm that this is not implemented right now).

We have been regularly adding AVT support on a need basis, and I think
actions should be mostly complete by now.

It is a little bit harder to handle those on controls, including
xxforms:dialog, bit I have added an RFE to track this:

http://forge.ow2.org/tracker/index.php?func=detail&aid=315098&group_id=168&atid=350207

We don't plan to add AVT support on @id attributes at this point
because the XForms engine relies on ids to identify elements in the
HTML DOM. If the id changes, it becomes tricky to find that element
again. It's probably not impossible but too much trouble at this point
unless somebody wants to tackle that project.

-Erik

On Wed, Jun 9, 2010 at 2:25 AM, Tim Pizey <[hidden email]> wrote:

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Hi Erik,

thank you for your response.

On 10 June 2010 23:36, Erik Bruchez <[hidden email]> wrote:
Would it be possible to approach this by adding support for AVTs on
all attributes except Ids?


> We don't plan to add AVT support on @id attributes at this point
> because the XForms engine relies on ids to identify elements in the
> HTML DOM. If the id changes, it becomes tricky to find that element
> again. It's probably not impossible but too much trouble at this point
> unless somebody wants to tackle that project.


Yes I can see that Ids are a special case.

Thanks again.
Tim

--
Tim Pizey
Centre for Genomics and Global Health <http://cggh.org>
The Wellcome Trust Centre for Human Genetics
Roosevelt Drive
Oxford
OX3 7BN
United Kingdom
Web: http://pizey.net/~timp
Tel: +44 (0)1865 287532


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>> It is a little bit harder to handle those on controls, including
>> xxforms:dialog, bit I have added an RFE to track this:
>>
>> http://forge.ow2.org/tracker/index.php?func=detail&aid=315098&group_id=168&atid=350207
>
>
> Would it be possible to approach this by adding support for AVTs on
> all attributes except Ids?

A general mechanism would be good, yes. But it's not as easy as it
might sound as attributes have different roles, and some attributes
can impact client-side code.

-Erik


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