Hyperlink to a Particular Instance?

One thing I haven't figured out how to do yet, after reading through
just about all of the Orbeon documentation, is how to load a particular
instance document (out of many) into one XForm.

For example, let's say I have a customer form that lists hyperlinks to
outstanding customer orders. I'd like to be able to click on a customer
order and go to an XForm to edit it. How can I formulate a hyperlink to
load a particular order with an XForm?

Thanks,
-Jim



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Hi Jim,

On Mon, May 5, 2008 at 4:26 PM, Jim Logan <[hidden email]> wrote:
>  For example, let's say I have a customer form that lists hyperlinks to
> outstanding customer orders. I'd like to be able to click on a customer
> order and go to an XForm to edit it. How can I formulate a hyperlink to load
> a particular order with an XForm?

Let's say the path of the page to view an order is /order/view. You
first map that this path to the XHTML+XForms in the page flow (<page
path-info="/order/view" view="view-order.xhtml"/>). Then let's say you
pass the order ID on the URL with ?order-id=123. In your XForms, on
xforms-model-construct-done, you load the instance for that ID. You
can access the ID in XPath with
xxforms:get-request-parameter('order-id'). You will typically load the
order document with a submission that calls an XPL, or a call to some
other service. Does this help?

Alex
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Alessandro Vernet wrote:
-Jim



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My progress was also stopped by this at one time.

The problem is that you cannot change the "action" attribute
of a submission -- at least, I don't know how to do this
in a dynamic way. (otherwise, you could change the action to
the url of your data, then submit / get it .)

So, you need a service you can rely on and pass a
parameter to it.

(and Alex can always answer these questions more quickly
and thoroughly than I.)

Cheers,
Hank

On May 5, 2008, at 5:15 PM, Alessandro Vernet wrote:
Hank Ratzesberger
NEES@UCSB
Institute for Crustal Studies,
University of California, Santa Barbara
805-893-8042







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Hi Hank,

On Mon, May 5, 2008 at 5:47 PM, Hank Ratzesberger
<[hidden email]> wrote:
>  The problem is that you cannot change the "action" attribute
>  of a submission -- at least, I don't know how to do this
>  in a dynamic way. (otherwise, you could change the action to
>  the url of your data, then submit / get it .)

Would AVTs work in this case? I.e. action="{xpath-expression}".

>  (and Alex can always answer these questions more quickly
>  and thoroughly than I.)

(To be fair, you are doing hell of a job here answering questions here
in the list! Thank you very much for your help!)

Alex
--
Orbeon Forms - Web 2.0 Forms, open-source, for the Enterprise
Orbeon's Blog: http://www.orbeon.com/blog/
Personal Blog: http://avernet.blogspot.com/
Twitter - http://twitter.com/avernet


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Trying to do my part.

I would bring this issue up with the xforms working group.
I think it raises security issues if it is "easy" to
change an action.

Of course, it's not really a problem for your server-side
code, and javascripted code is already vulnerable,
so, yes, I suppose this might be a case where AVT
would work, but I don't recall at what stage they
are evaluated.  So, perhaps yes, AVT for xform
elements, evaluated when the element is processed.

Cheers,
Hank



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On Mon, May 5, 2008 at 8:55 PM, Hank Ratzesberger
<[hidden email]> wrote:
>  Of course, it's not really a problem for your server-side
>  code, and javascripted code is already vulnerable,
>  so, yes, I suppose this might be a case where AVT
>  would work, but I don't recall at what stage they
>  are evaluated.  So, perhaps yes, AVT for xform
>  elements, evaluated when the element is processed.

Yes, exactly; in the case of the submission, the AVTs in the action
attribute will be evaluated when the submission runs.

Alex
--
Orbeon Forms - Web 2.0 Forms, open-source, for the Enterprise
Orbeon's Blog: http://www.orbeon.com/blog/
Personal Blog: http://avernet.blogspot.com/
Twitter - http://twitter.com/avernet


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Alessandro Vernet wrote:
Is it possible to use a RESTful URL that has the instance ID embedded in
it, like "http://modeldriven.org/orders/order/1234"? I don't see a way
to get at the original URL.

Thanks,
-Jim


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On May 8, 2008, at 8:49 AM, Jim Logan wrote:
Hi Jim,

You can fashion a <page> element in page-flow.xml to use the  
'matcher' attribute, and have
one xpl that handles all path-info="/orders/order(.*)" documents.  
The matches are
available in the pipeline in a way similar to xforms model.

It's been a while since i used...you use <setvalue> to put the  
captured results in
the instance input of your pipeline.

HTH,
Hank


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Hank Ratzesberger
NEES@UCSB
Institute for Crustal Studies,
University of California, Santa Barbara
805-893-8042







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Hank Ratzesberger wrote:
How does the XPL get the instance (or instance ID) to the the XForm? I
haven't read much on the XPL stuff yet, as I didn't expect to need it.

Thanks,
-Jim



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On May 8, 2008, at 6:48 PM, Jim Logan wrote:
Well, I was attempting to answer the smaller question of how you can  
have the
same xpl handle urls with the variable embedded in the url rather than
passed as parameters (with ?...).

Indeed there is still an issue of updating the instance in the xform,  
and
submit is the way to do that.

At first, I think it would be easier to use POST, because the URL,
and therefore the submission attribute action="" would remain constant.
The index('list-repeat') would reference what data to transmit -- not
RESTful but I think it would work. One trigger, something like:

<trigger>
   <action ev:event="DOMactivate">
      <setvalue ref="instance('submit-inst')/order-no"
         value="instance('list-inst')/orders[index('list-repeat-id')]/
order-no"/>
      <send submission="the-post-submit"/>
   </action>
</trigger>

What I think you want, is to present a list, the user clicks on one of
the items in the list, and the form is updated with the data the item
(url) references.

In my limited experience, I can't think of a way to do this without
using POST to a service....

--Hank


Hank Ratzesberger
NEES@UCSB
Institute for Crustal Studies,
University of California, Santa Barbara
805-893-8042







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