Nested Repeats, position()?

Hi Chris,

I have a nested set of repeats, how do you know what position() is related to
- the inner out outer repeat?  Can you reference it via the id of the
repeat.  So master_id.position()?

you will encounter problems when using position() regarding repeat items; googling for "ops-users position()" returns some mailing list threads concerning that problem. Instead, you could try

<xforms:output value="count(preceding-sibling::*) + 1"/>

to get the position of the current repeat element.

To refer an outer repeat, you can use a OF xforms extension named xxforms:repeat-current with the id of the referred repeat. See:

http://www.orbeon.com/ops/doc/reference-xforms-2#ops-extensions

so it looks like
                                    <xforms:group ref="xxforms:repeat-current('outer')">
    <xforms:output value="count(preceding-sibling::*) + 1"/>
</xforms:group>


HTH
florian

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Ryan,

    Thats actually not the case any more, the latest OF build makes use of the position() function and has done for a while

good to hear, thank you for the hint. But regarding the special case where an "outer" repeat should be referenced, using position() seems not to work properly. I've attached an example file where the position() of both the "actual" and an "outer" repeat is used as xforms:output/@value, and only in the first case the position is correct. Using preceding-sibling gives the correct value also in the second case.

florian

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Florian,

On 6/5/07, Florian Schmitt [hidden email] wrote:

good to hear, thank you for the hint. But regarding the special case
where an "outer" repeat should be referenced, using position() seems not
to work properly. I've attached an example file where the position() of
both the "actual" and an "outer" repeat is used as xforms:output/@value,
and only in the first case the position is correct. Using
preceding-sibling gives the correct value also in the second case.

Thank you for the example. But I think this is the expected behavior.
Expression are evaluated in a context, which is made of 3 things: the
context item, the position, and the context size. When you do:

<xforms:group ref="xxforms:repeat-current('outer')">
   <xforms:output value="count(preceding-sibling::*) + 1"/> -
   <xforms:output value="position()" />
</xforms:group>

The xforms:group sets the context item to the current node for the
outer iteration. But a group always makes the position = 1 and context
size = 1. So if you are inside a nested repeat, you can't use
position() anymore to get the position of the outer repeat. In that
case you will need to use count([preceding-sibling::foo).

Alex

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Chris,

On 6/6/07, ChrisSpeare [hidden email] wrote:

<xforms:select1 ref="/Country/IdentificationCode" model="model_SeaManifest"
>
        <xforms:action ev:event="xforms-value-changed">
                <xforms:setvalue
ref="instance('instance_model_SeaManifest')/ManifestInformation/Shipment[position()]/Schedule/RoutingPort/Country/Name"
value="instance('CountryList')/item[countryCode=instance('instance_model_SeaManifest')/ManifestInformation/Shipment[position()]/Schedule/RoutingPort/Country/IdentificationCode]/countryName"/>
        </xforms:action>
        ...
</xforms:select1>

Where the repeat was just shipment, however the repeat concerns a repeat on
routing port as well.  So how do I set the value of the inner item in the
context of a select1 action?

You are repeating on the Shipment element. I would use
xxforms:repeat-current() here. It is an extension, but it makes
expressions much simpler to understand. The value expression would
become:

instance('CountryList')/item[countryCode=xxforms:repeat-current()/Schedule/RoutingPort/Country/IdentificationCode]/countryName

Alex

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Unfortunately, I don't think this will make it into 1.1. But as Alex pointed out, the working group is considering many features for future versions.

-Erik

Ryan Puddephatt wrote:

Alex,
    Is there any talk of a similar function in Xforms 1.1?

Ryan

Ryan Puddephatt
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Alessandro Vernet wrote:

Chris,

On 6/6/07, ChrisSpeare [hidden email] wrote:

<xforms:select1 ref="/Country/IdentificationCode" model="model_SeaManifest"
>
        <xforms:action ev:event="xforms-value-changed">
                <xforms:setvalue
ref="instance('instance_model_SeaManifest')/ManifestInformation/Shipment[position()]/Schedule/RoutingPort/Country/Name"
value="instance('CountryList')/item[countryCode=instance('instance_model_SeaManifest')/ManifestInformation/Shipment[position()]/Schedule/RoutingPort/Country/IdentificationCode]/countryName"/>
        </xforms:action>
        ...
</xforms:select1>

Where the repeat was just shipment, however the repeat concerns a repeat on
routing port as well.  So how do I set the value of the inner item in the
context of a select1 action?

You are repeating on the Shipment element. I would use
xxforms:repeat-current() here. It is an extension, but it makes
expressions much simpler to understand. The value expression would
become:

instance('CountryList')/item[countryCode=xxforms:repeat-current()/Schedule/RoutingPort/Country/IdentificationCode]/countryName

Alex
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