call-xpl refresh problem

Hi,

In our application we're editing an XForms-instance. This instance contains some uri's which represent relations to other objects. The metadata of these objects is stored externally (name, date, ...). Using an xpl service, we retrieve the metadata and show these metadata in the editing application.

An example call to the xpl service is:
<f:output class="thumbnail" mediatype="image/*" value="xxforms:call-xpl('oxf:/spil-edit/services/run-extobj-query.xpl', ('instance'), (.), ('data'))/*/note[@ext:qual='URI']/text()" />

The above example works fine, except that the service is called every time an object gets/loses focus. How can we change this so that the service is only called when:
- the xforms-instance is first loaded
- some elements are changed?

If this is not possible, how can we enable caching for the xpl-service?

gts,
Ronny



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Ronny,

What I would do would be to perform xxforms:call-xpl() only upon certain
events, for example upon catching xforms-ready or some
xforms-value-changed events. Store the result of xxforms:call-xpl() into
an instance. Then have your xforms:output bound to values in that instance.

Something like this:

<xforms:insert ev:event="xforms-ready"
         nodeset="instance('relations-instance')"
         origin="xxforms:call-xpl(...)"/>

-Erik

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Erik,

Thx for the quick response.
I've also considered that, but unfortunately the example below is
enclosed in a repeat which makes updating this relations-instance a lot
harder.

Do we have another option?

Gts,
Ronny

-----Oorspronkelijk bericht-----
Van: Erik Bruchez [mailto:[hidden email]] Namens Erik Bruchez
Verzonden: Tuesday, January 16, 2007 11:36 AM
Aan: [hidden email]
Onderwerp: Re: [ops-users] call-xpl refresh problem

Ronny,

What I would do would be to perform xxforms:call-xpl() only upon certain

events, for example upon catching xforms-ready or some
xforms-value-changed events. Store the result of xxforms:call-xpl() into

an instance. Then have your xforms:output bound to values in that
instance.

Something like this:

<xforms:insert ev:event="xforms-ready"
         nodeset="instance('relations-instance')"
         origin="xxforms:call-xpl(...)"/>

-Erik

[hidden email] wrote:
> Hi,
>
> In our application we're editing an XForms-instance. This instance
contains some uri's which represent relations to other objects. The
metadata of these objects is stored externally (name, date, ...). Using
an xpl service, we retrieve the metadata and show these metadata in the
editing application.
>
> An example call to the xpl service is:
> <f:output class="thumbnail" mediatype="image/*"
value="xxforms:call-xpl('oxf:/spil-edit/services/run-extobj-query.xpl',
('instance'), (.), ('data'))/*/note[@ext:qual='URI']/text()" />
>
> The above example works fine, except that the service is called every
time an object gets/loses focus. How can we change this so that the
service is only called when:
> - the xforms-instance is first loaded
> - some elements are changed?
>
> If this is not possible, how can we enable caching for the
xpl-service?
>
> gts,
> Ronny

--
Orbeon Forms - Web Forms for the Enterprise Done the Right Way
http://www.orbeon.com/




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