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accessing parent of a context node in dynamically-generated instance

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Alexander Žaťko
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accessing parent of a context node in dynamically-generated instance

Alexander Žaťko
Say I have a dynamically-generated XForms instance like the one below
where the number of detail elements varies with every request.

<form-model>
        <detail det-id="1">
                <foo>8829292</foo>
                <target-element/>
        </detail>
        <detail det-id ="2">
                <foo/>4648749</foo>
                <target-element/>
        </detail>
        ...more detail elements potentially here...
</form-model>

I am attempting to claculate value of the "target-element" from values
of the "foo" element and the value of the detail/@det-id attribute
using the "calculate" facility of XForms "bind" element. Let's suppose
that the function I want to use is concat(). After the calculation, the
instance should then look like this:

<form-model>
        <detail det-id="1">
                <foo>8829292</foo>
                <target-element>88292921</target-element>
        </detail>
        <detail det-id ="2">
                <foo/>4648749</foo>
                <target-element>46487492</target-element>
        </detail>
        ...more detail elements potentially here...
</form-model>

The problem I have is that the XPath expression I use in the bind:

<xforms:bind nodeset="target-element" calculate="concat(../foo,
../../detail/@det-id)"/>

...returns nodeset of all "detail" nodes as a value of the second
operand which concat() does not like. Any ideas as to how to get what I
want using xforms?

Thanks




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Erik Bruchez
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Re: accessing parent of a context node in dynamically-generated instance

Erik Bruchez
Administrator
Alexander Zatko wrote:
 > Say I have a dynamically-generated XForms instance like the one below
 > where the number of detail elements varies with every request.
 >
 > <form-model>
 >     <detail det-id="1">
 >         <foo>8829292</foo>
 >         <target-element/>
 >     </detail>
 >     <detail det-id ="2">
 >         <foo/>4648749</foo>
 >         <target-element/>
 >     </detail>
 >     ...more detail elements potentially here...
 > </form-model>
 >
 > I am attempting to claculate value of the "target-element" from values
 > of the "foo" element and the value of the detail/@det-id attribute using
 > the "calculate" facility of XForms "bind" element. Let's suppose that
 > the function I want to use is concat(). After the calculation, the
 > instance should then look like this:
 >
 > <form-model>
 >     <detail det-id="1">
 >         <foo>8829292</foo>
 >         <target-element>88292921</target-element>
 >     </detail>
 >     <detail det-id ="2">
 >         <foo/>4648749</foo>
 >         <target-element>46487492</target-element>
 >     </detail>
 >     ...more detail elements potentially here...
 > </form-model>
 >
 > The problem I have is that the XPath expression I use in the bind:
 >
 > <xforms:bind nodeset="target-element" calculate="concat(../foo,
 > ../../detail/@det-id)"/>
 >
 > ...returns nodeset of all "detail" nodes as a value of the second
 > operand which concat() does not like. Any ideas as to how to get what I
 > want using xforms?

Try:

<xforms:bind nodeset="/form-model/detail/target-element"
   calculate="concat(../foo, ../../@det-id)"/>

Your ../../detail/@det-id returned a node-set containing all the
det-id attributes, hence your error.

-Erik




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Alexander Žaťko
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Re: accessing parent of a context node in dynamically-generated instance

Alexander Žaťko
Eric,

The path that works is actually "../@det-id", but you pointed me in the
right direction.

Thank you.

A.

On Nov 30, 2005, at 5:58 AM, Erik Bruchez wrote:

> Alexander Zatko wrote:
> > Say I have a dynamically-generated XForms instance like the one below
> > where the number of detail elements varies with every request.
> >
> > <form-model>
> >     <detail det-id="1">
> >         <foo>8829292</foo>
> >         <target-element/>
> >     </detail>
> >     <detail det-id ="2">
> >         <foo/>4648749</foo>
> >         <target-element/>
> >     </detail>
> >     ...more detail elements potentially here...
> > </form-model>
> >
> > I am attempting to claculate value of the "target-element" from
> values
> > of the "foo" element and the value of the detail/@det-id attribute
> using
> > the "calculate" facility of XForms "bind" element. Let's suppose that
> > the function I want to use is concat(). After the calculation, the
> > instance should then look like this:
> >
> > <form-model>
> >     <detail det-id="1">
> >         <foo>8829292</foo>
> >         <target-element>88292921</target-element>
> >     </detail>
> >     <detail det-id ="2">
> >         <foo/>4648749</foo>
> >         <target-element>46487492</target-element>
> >     </detail>
> >     ...more detail elements potentially here...
> > </form-model>
> >
> > The problem I have is that the XPath expression I use in the bind:
> >
> > <xforms:bind nodeset="target-element" calculate="concat(../foo,
> > ../../detail/@det-id)"/>
> >
> > ...returns nodeset of all "detail" nodes as a value of the second
> > operand which concat() does not like. Any ideas as to how to get
> what I
> > want using xforms?
>
> Try:
>
> <xforms:bind nodeset="/form-model/detail/target-element"
>   calculate="concat(../foo, ../../@det-id)"/>
>
> Your ../../detail/@det-id returned a node-set containing all the
> det-id attributes, hence your error.
>
> -Erik
>
>
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> [hidden email] mailing list.
> To unsubscribe: mailto:[hidden email]
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