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populating node set dynamically using xxforms:call-xpl

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Alexander Žaťko

populating node set dynamically using xxforms:call-xpl

I have a need to generate a nodeset dynamically in my XForms instance
based on xforms-value-changed event triggered when user selects an
entry in a select1 drop-down. Can I use something like this:

<xforms:bind
nodeset="instance('pomocna')//systemy"
calculate="xxforms:call-xpl
(
'oxf:/csp/users/edit_user/nacitaj-
systemy.xpl',
'data',
instance('main-instance')//zoznamy/
role/@selected,
'data'
)"/>

According to the XForms spec the expression in the "calculate"
attribute should produce a value whereas the xxforms:call-xpl
function will produce a nodeset. The xxforms:call-xpl function
executes a db query which returns a nodest that I want to insert into
the "instance('pomocna')//systemy" nodeset as a child of the
"systemy" node.

Possibly there is an alternative way to achieve my goal.

A.

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Erik Bruchez

Re: populating node set dynamically using xxforms:call-xpl

Administrator

Alex,

Yes, @calculate always returns a string. There is just no way to change
that.

Instead of xforms:bind/@calculate, you can use xforms:insert/@origin.
You have to figure out an appropriate time to run that action, and then
your @origin attribute can call xxforms:call-xpl(). This is not perfect
however, as @origin can return only a single node (in fact, I wonder
whether this should be changed in XForms 1.2 - I just made a proposal to
that effect as this is the second day in a row where I hit the
requirement of copying multiple nodes with xforms:insert).

As workarounds, I see without thinking too much:

o Copying the root element returned by xxforms:call-xpl() into a
temporary instance, and then using xforms:insert/@while to copy all the
child elements to the destination instance

o Using a submission with replace="instance"

-Erik

Alexander Zatko wrote:

> I have a need to generate a nodeset dynamically in my XForms instance
> based on xforms-value-changed event triggered when user selects an entry
> in a select1 drop-down. Can I use something like this:
>
> <xforms:bind
> nodeset="instance('pomocna')//systemy"
> calculate="xxforms:call-xpl
> (
>
> 'oxf:/csp/users/edit_user/nacitaj-systemy.xpl',
> 'data',
>
> instance('main-instance')//zoznamy/role/@selected,
> 'data'
> )"/>
>
> According to the XForms spec the expression in the "calculate" attribute
> should produce a value whereas the xxforms:call-xpl function will
> produce a nodeset. The xxforms:call-xpl function executes a db query
> which returns a nodest that I want to insert into the
> "instance('pomocna')//systemy" nodeset as a child of the "systemy" node.
>
> Possibly there is an alternative way to achieve my goal.
>
> A.
>
>
>
>
> ------------------------------------------------------------------------
>
>
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Alexander Žaťko

Re: populating node set dynamically using xxforms:call-xpl

Erik, how would I copy the root returned by the xxforms:call-xpl()
function (as in the first option you proposed)?

A.

On Oct 19, 2006, at 3:25 PM, Erik Bruchez wrote:

> Alex,
>
> Yes, @calculate always returns a string. There is just no way to
> change that.
>
> Instead of xforms:bind/@calculate, you can use xforms:insert/
> @origin. You have to figure out an appropriate time to run that
> action, and then your @origin attribute can call xxforms:call-xpl
> (). This is not perfect however, as @origin can return only a
> single node (in fact, I wonder whether this should be changed in
> XForms 1.2 - I just made a proposal to that effect as this is the
> second day in a row where I hit the requirement of copying multiple
> nodes with xforms:insert).
>
> As workarounds, I see without thinking too much:
>
> o Copying the root element returned by xxforms:call-xpl() into a
> temporary instance, and then using xforms:insert/@while to copy all
> the child elements to the destination instance
>
> o Using a submission with replace="instance"
>
> -Erik
>
> Alexander Zatko wrote:
>> I have a need to generate a nodeset dynamically in my XForms
>> instance based on xforms-value-changed event triggered when user
>> selects an entry in a select1 drop-down. Can I use something like
>> this:
>> <xforms:bind
>> nodeset="instance('pomocna')//systemy"
>> calculate="xxforms:call-xpl
>> (
>> 'oxf:/csp/users/edit_user/nacitaj-
>> systemy.xpl',
>> 'data',
>> instance('main-instance')//zoznamy/
>> role/@selected,
>> 'data'
>> )"/>
>> According to the XForms spec the expression in the "calculate"
>> attribute should produce a value whereas the xxforms:call-xpl
>> function will produce a nodeset. The xxforms:call-xpl function
>> executes a db query which returns a nodest that I want to insert
>> into the "instance('pomocna')//systemy" nodeset as a child of the
>> "systemy" node.
>> Possibly there is an alternative way to achieve my goal.
>> A.
>> ---------------------------------------------------------------------
>> ---
>> --
>> You receive this message as a subscriber of the ops-
>> [hidden email] mailing list.
>> To unsubscribe: mailto:[hidden email]
>> For general help: mailto:[hidden email]?subject=help
>> ObjectWeb mailing lists service home page: http://
>> www.objectweb.org/wws
>
>
> --
> Orbeon - XForms Everywhere:
> http://www.orbeon.com/blog/
>
>
> --
> You receive this message as a subscriber of the ops-
> [hidden email] mailing list.
> To unsubscribe: mailto:[hidden email]
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> wws

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Erik Bruchez

Re: populating node set dynamically using xxforms:call-xpl

Administrator

With something like this:

<xforms:insert nodeset="instance('dest')"
origin="xxforms:call-xpl(...)"/>

-Erik

Alexander Zatko wrote:

> Erik, how would I copy the root returned by the xxforms:call-xpl()
> function (as in the first option you proposed)?
>
> A.
>
>
> On Oct 19, 2006, at 3:25 PM, Erik Bruchez wrote:
>
>> Alex,
>>
>> Yes, @calculate always returns a string. There is just no way to
>> change that.
>>
>> Instead of xforms:bind/@calculate, you can use xforms:insert/@origin.
>> You have to figure out an appropriate time to run that action, and
>> then your @origin attribute can call xxforms:call-xpl(). This is not
>> perfect however, as @origin can return only a single node (in fact, I
>> wonder whether this should be changed in XForms 1.2 - I just made a
>> proposal to that effect as this is the second day in a row where I hit
>> the requirement of copying multiple nodes with xforms:insert).
>>
>> As workarounds, I see without thinking too much:
>>
>> o Copying the root element returned by xxforms:call-xpl() into a
>> temporary instance, and then using xforms:insert/@while to copy all
>> the child elements to the destination instance
>>
>> o Using a submission with replace="instance"
>>
>> -Erik
>>
>> Alexander Zatko wrote:
>>> I have a need to generate a nodeset dynamically in my XForms instance
>>> based on xforms-value-changed event triggered when user selects an
>>> entry in a select1 drop-down. Can I use something like this:
>>> <xforms:bind
>>> nodeset="instance('pomocna')//systemy"
>>> calculate="xxforms:call-xpl
>>> (
>>>
>>> 'oxf:/csp/users/edit_user/nacitaj-systemy.xpl',
>>> 'data',
>>>
>>> instance('main-instance')//zoznamy/role/@selected,
>>> 'data'
>>> )"/>
>>> According to the XForms spec the expression in the "calculate"
>>> attribute should produce a value whereas the xxforms:call-xpl
>>> function will produce a nodeset. The xxforms:call-xpl function
>>> executes a db query which returns a nodest that I want to insert into
>>> the "instance('pomocna')//systemy" nodeset as a child of the
>>> "systemy" node.
>>> Possibly there is an alternative way to achieve my goal.
>>> A.
>>> ------------------------------------------------------------------------
>>> --
>>> You receive this message as a subscriber of the
>>> [hidden email] mailing list.
>>> To unsubscribe: mailto:[hidden email]
>>> For general help: mailto:[hidden email]?subject=help
>>> ObjectWeb mailing lists service home page: http://www.objectweb.org/wws
>>
>>
>> --Orbeon - XForms Everywhere:
>> http://www.orbeon.com/blog/
>>
>>
>> --
>> You receive this message as a subscriber of the
>> [hidden email] mailing list.
>> To unsubscribe: mailto:[hidden email]
>> For general help: mailto:[hidden email]?subject=help
>> ObjectWeb mailing lists service home page: http://www.objectweb.org/wws
>
>
>
> ------------------------------------------------------------------------
>
>
> --
> You receive this message as a subscriber of the [hidden email] mailing list.
> To unsubscribe: mailto:[hidden email]
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Alexander Žaťko

Re: populating node set dynamically using xxforms:call-xpl

Erik,

Originally you wrote:

>>> This is not perfect however, as @origin can return only a single
>>> node

I (believe) I verified that claim myself by testing, and only the
root node of the nodeset returned by the xxforms:call-xpl() function
was inserted by the xforms:insert.

So I do not understand how would I copy the complete nodeset returned
by the xxforms:call-xpl() when used as a value of the xforms:insert/
@origin attribute as you are advising me now.

I also tested the replace="instance" approach and managed to have the
instance submitted and updated (I can see this by looking at the log)
by the same xpl that in my previous tests I had called by the
xxforms:call-xpl() function, but the instance does not seem to get
replaced. Is there any trick to the replace="instance" method?

Here is my submission element:

<xforms:submission id="akt-sys" ref="/" action="/users/akt-systes"
method="post" replace="instance"/>

In my XPL I have one input named "instance" and one output named
"data". The view doc is XSL-generated. The submission in the view is
invoked by this code:

<xforms:select1... >
<xforms:itemset nodeset="....">
<xforms:label ref="."/>
<xforms:copy ref="."/>
</xforms:itemset>
<xforms:action ev:event="xforms-value-changed">
<xforms:setvalue ref="instance('main-instance')//
action">update-sys</xforms:setvalue>
<xforms:send submission="update-sys"/>
</xforms:action>
</xforms:select1>

Thank you for your help

A.

On Oct 19, 2006, at 8:11 PM, Erik Bruchez wrote:

> With something like this:
>
> <xforms:insert nodeset="instance('dest')"
> origin="xxforms:call-xpl(...)"/>
>
> -Erik
>
> Alexander Zatko wrote:
>> Erik, how would I copy the root returned by the xxforms:call-xpl()
>> function (as in the first option you proposed)?
>> A.
>> On Oct 19, 2006, at 3:25 PM, Erik Bruchez wrote:
>>> Alex,
>>>
>>> Yes, @calculate always returns a string. There is just no way to
>>> change that.
>>>
>>> Instead of xforms:bind/@calculate, you can use xforms:insert/
>>> @origin. You have to figure out an appropriate time to run that
>>> action, and then your @origin attribute can call xxforms:call-xpl
>>> (). This is not perfect however, as @origin can return only a
>>> single node (in fact, I wonder whether this should be changed in
>>> XForms 1.2 - I just made a proposal to that effect as this is the
>>> second day in a row where I hit the requirement of copying
>>> multiple nodes with xforms:insert).
>>>
>>> As workarounds, I see without thinking too much:
>>>
>>> o Copying the root element returned by xxforms:call-xpl() into a
>>> temporary instance, and then using xforms:insert/@while to copy
>>> all the child elements to the destination instance
>>>
>>> o Using a submission with replace="instance"
>>>
>>> -Erik
>>>
>>> Alexander Zatko wrote:
>>>> I have a need to generate a nodeset dynamically in my XForms
>>>> instance based on xforms-value-changed event triggered when user
>>>> selects an entry in a select1 drop-down. Can I use something
>>>> like this:
>>>> <xforms:bind
>>>> nodeset="instance('pomocna')//systemy"
>>>> calculate="xxforms:call-xpl
>>>> (
>>>> 'oxf:/csp/users/edit_user/
>>>> nacitaj-systemy.xpl',
>>>> 'data',
>>>> instance('main-instance')//
>>>> zoznamy/role/@selected,
>>>> 'data'
>>>> )"/>
>>>> According to the XForms spec the expression in the "calculate"
>>>> attribute should produce a value whereas the xxforms:call-xpl
>>>> function will produce a nodeset. The xxforms:call-xpl function
>>>> executes a db query which returns a nodest that I want to insert
>>>> into the "instance('pomocna')//systemy" nodeset as a child of
>>>> the "systemy" node.
>>>> Possibly there is an alternative way to achieve my goal.
>>>> A.
>>>> -------------------------------------------------------------------
>>>> -----
>>>> --
>>>> You receive this message as a subscriber of the ops-
>>>> [hidden email] mailing list.
>>>> To unsubscribe: mailto:[hidden email]
>>>> For general help: mailto:[hidden email]?subject=help
>>>> ObjectWeb mailing lists service home page: http://
>>>> www.objectweb.org/wws
>>>
>>>
>>> --Orbeon - XForms Everywhere:
>>> http://www.orbeon.com/blog/
>>>
>>>
>>> --
>>> You receive this message as a subscriber of the ops-
>>> [hidden email] mailing list.
>>> To unsubscribe: mailto:[hidden email]
>>> For general help: mailto:[hidden email]?subject=help
>>> ObjectWeb mailing lists service home page: http://
>>> www.objectweb.org/wws
>> ---------------------------------------------------------------------
>> ---
>> --
>> You receive this message as a subscriber of the ops-
>> [hidden email] mailing list.
>> To unsubscribe: mailto:[hidden email]
>> For general help: mailto:[hidden email]?subject=help
>> ObjectWeb mailing lists service home page: http://
>> www.objectweb.org/wws
>
>
> --
> Orbeon - XForms Everywhere:
> http://www.orbeon.com/blog/
>
>
> --
> You receive this message as a subscriber of the ops-
> [hidden email] mailing list.
> To unsubscribe: mailto:[hidden email]
> For general help: mailto:[hidden email]?subject=help
> ObjectWeb mailing lists service home page: http://www.objectweb.org/
> wws

Erik Bruchez

Re: populating node set dynamically using xxforms:call-xpl

Administrator

Alex,

> I (believe) I verified that claim myself by testing, and only the
> root node of the nodeset returned by the xxforms:call-xpl() function
> was inserted by the xforms:insert.

Correct.

> So I do not understand how would I copy the complete nodeset returned by
> the xxforms:call-xpl() when used as a value of the xforms:insert/@origin
> attribute as you are advising me now.

First step is to copy the result into a new instance:

<xforms:instance id="dest">
<empty/>
</xforms:instance>

<xforms:insert nodeset="instance('dest')"
origin="xxforms:call-xpl(...)"/>

Then move over all the child elements of the root element of that
instance to where you want to put them, using something like:

<xforms:action while="instance("dest")/*">
<xforms:insert context="instance('wherever')" nodeset="*"
origin="instance("dest")/*[1]"/>
<xforms:delete nodeset="instance("dest")/*[1]"/>
</xforms:action>

> I also tested the replace="instance" approach and managed to have the
> instance submitted and updated (I can see this by looking at the log) by
> the same xpl that in my previous tests I had called by the
> xxforms:call-xpl() function, but the instance does not seem to get
> replaced. Is there any trick to the replace="instance" method?

If the submission succeeded, then the instance should be replaced. Be
sure to enabled XForms logging in log4j.xml to see what's happening
there.

-Erik

--
Orbeon - XForms Everywhere:
http://www.orbeon.com/blog/

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Alexander Žaťko

Re: populating node set dynamically using xxforms:call-xpl

Thanks Erik,

The code below works fine.

A.

On Oct 20, 2006, at 3:29 PM, Erik Bruchez wrote:

> Alex,
>
> > I (believe) I verified that claim myself by testing, and only the
> > root node of the nodeset returned by the xxforms:call-xpl() function
> > was inserted by the xforms:insert.
>
> Correct.
>
> > So I do not understand how would I copy the complete nodeset
> returned by
> > the xxforms:call-xpl() when used as a value of the xforms:insert/
> @origin
> > attribute as you are advising me now.
>
> First step is to copy the result into a new instance:
>
> <xforms:instance id="dest">
> <empty/>
> </xforms:instance>
>
> <xforms:insert nodeset="instance('dest')"
> origin="xxforms:call-xpl(...)"/>
>
> Then move over all the child elements of the root element of that
> instance to where you want to put them, using something like:
>
> <xforms:action while="instance("dest")/*">
> <xforms:insert context="instance('wherever')" nodeset="*"
> origin="instance("dest")/*[1]"/>
> <xforms:delete nodeset="instance("dest")/*[1]"/>
> </xforms:action>
>
> > I also tested the replace="instance" approach and managed to have
> the
> > instance submitted and updated (I can see this by looking at the
> log) by
> > the same xpl that in my previous tests I had called by the
> > xxforms:call-xpl() function, but the instance does not seem to get
> > replaced. Is there any trick to the replace="instance" method?
>
> If the submission succeeded, then the instance should be replaced. Be
> sure to enabled XForms logging in log4j.xml to see what's happening
> there.
>
> -Erik
>
> --
> Orbeon - XForms Everywhere:
> http://www.orbeon.com/blog/
>
>
>
> --
> You receive this message as a subscriber of the ops-
> [hidden email] mailing list.
> To unsubscribe: mailto:[hidden email]
> For general help: mailto:[hidden email]?subject=help
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> wws

Henrik Pettersen

Re: populating node set dynamically using xxforms:call-xpl

In reply to this post by Alexander Žaťko

Alexander,

there might be an easier way to do this. If I understand you correctly, you want to do asynchronous updates to the page (i.e. without reloading the whole page) when the user selects a value from a drop down box. If so, there is a built-in method in XForms for doing just this:

1. Start by adding the attribute 'replace="instance"' to your submission.

<xforms:submission id="test-expression-submission"
                   ref="instance('test-expression')"
                   method="post"
                   action="/query/nexttermtoken"
                   replace="instance"/>

2. Then add the attribute 'incremental="true"' to your XForms control

<xforms:select1 ref="instance('test-expression')/aspic:expression" selection="open" incremental="true" appearance="xxforms:autocomplete">
    <xforms:itemset nodeset="instance('knowledgebase')/aspic:predictive/aspic:name">
        <xforms:label ref="."/>
        <xforms:value ref="."/>
    </xforms:itemset>
    <xforms:label ref="instance('resources-instance')/aspic:testexpression"/>
    <xforms:action ev:event="xforms-value-changed">
        <xforms:send submission="test-expression-submission"/>
    </xforms:action>
</xforms:select1>

3. Declare your web service in pageflow.xml. This service will return you the updated instance data when calling "test-expression-submission". Note how the "view" attribute points to your xpl.

    <page path-info="/query/nexttermtoken"
          id="query.nexttermtoken"
          view="oxf:/knowledgebase/service/nextTermToken.xpl"/>

4. Here is my data generating XPL, as an example:

<p:config xmlns:p="http://www.orbeon.com/oxf/pipeline"
          xmlns:oxf="http://www.orbeon.com/oxf/processors "
          xmlns:aspic="http://www.cruk.com/aspic/editor/v1">

    <p:param name="instance" type="input" debug="******************INPUT***************"/>
    <p:param name="data" type="output" debug="******************OUTPUT***************"/>

    <p:processor name="oxf:java">
        <p:input name="config">
            <config sourcepath="oxf:/java" class="org.cruk.aspic.editor.api.orbeon.NextTermToken"/>
        </p:input>
        <p:input name="data" href="#instance"/>
        <p:output name="data" ref="data"/>
    </p:processor>
</p:config>

5. Word of advice: Try to shape and transform your instance data in the xpl -

> "insert into the "instance('pomocna')//systemy" nodeset as a child of the 'systemy' node"

might be more easily achieved if done in the xpl.

Hope this helps and was to the point.

Sincerely,
Henrik Pettersen

On 10/19/06, Alexander Zatko <[hidden email]> wrote:

I have a need to generate a nodeset dynamically in my XForms instance
based on xforms-value-changed event triggered when user selects an
entry in a select1 drop-down. Can I use something like this:

<xforms:bind
                             nodeset="instance('pomocna')//systemy"
                             calculate="xxforms:call-xpl
                             (
                                 'oxf:/csp/users/edit_user/nacitaj-
systemy.xpl',
                                 'data',
                                 instance('main-instance')//zoznamy/
role/@selected,
                                 'data'
                             )"/>

According to the XForms spec the expression in the "calculate"
attribute should produce a value whereas the xxforms:call-xpl
function will produce a nodeset. The xxforms:call-xpl function
executes a db query which returns a nodest that I want to insert into
the "instance('pomocna')//systemy" nodeset as a child of the
"systemy" node.

Possibly there is an alternative way to achieve my goal.

A.

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