I have an XForm survey. I'd like to keep the questions in a separate xf:instance of the same model from the xf:instance that collects the answers. In one instance, a group containing 10 questions. In a second instance, a group to hold the 10 answers. The second instance will be submitted. So, this is similiar to a join between two lists.
I've tried using logic like the following:
<xf:output ref="instance('questions')/question[position()]/@text"></xf:output>
but that position() is always returning 1, because the context is of the questions xf:instance. Using the index('current-repeater') updates all 10 displayed questions to be the question at the index of the most recently focused repeat iteration.
Is there a way to use a temporary variable in the xpath to accomplish this? I've tried various uses of $variables and even:
<xf:output ref="instance('questions')/question[position() = (count(current()/preceding-sibling::*) + 1)]/@text"></xf:output>
Thanks,
Jason
Well, it turns out this is currently not supported:
Axes such as "preceding-sibling::" are not yet supported by the XPath analyzer of XSLTForms, which is written with XSLT 1.0.
Instead, do something along these lines:
<xf:instance id="positions">
<data xmlns="">
<position />
</data
</xf:instance>
...
<xf:setvalue ref="instance('positions')/position">1</xf:setvalue>
<xf:setvalue ref="instance('positions')/position" value="count(instance('main')/path/to/things/thing)-1" />
etc.
Then to use them:
<xf:input ref="path/to/things/thing[instance('positions')/position]"> ...
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