indexed-repeat() not working in XPath predicate?

[joeflack4]

Description

I have a repeat group. Then, I have a question which has a dynamic list of options that populate from what is entered in that repeat group. Works fine in ODK Collect, but not in Enketo. There doesn't appear to be a way to declare my repeat group "finished" so that it can properly render my multiple choice question.

Additional info

I've attached a zip file. The v2 file converts fine and can be loaded on Enketo. V3 is the same as v2, only it can also be uploaded to ODK Aggregate.

AUTO-v2_and_v3.zip

[MartijnR]

Thanks Joe,

Wow, that's quite an operation you've got going there! It's very hard to wrap my head around it but you are probably right that it is a bug (with using indexed-repeat() in a choice_filter). Will check it out (but probably not any time soon).

What this shows (apart from a possible bug) is that we should find a way to simplify creating a choice list from repeated answers in the same form in XLSForm. It is extraordinarily simple in XForms. See this simplified version of your XForm:

AUTO-v3-jef-simplified.xml.txt

The magic is just this:

    <select appearance="compact" ref="/AUTO-v3-jef/people_1">
        <label>Select people:</label>
        <itemset nodeset="/AUTO-v3-jef/member_info[./age &gt;= 18]">
            <value ref="member_name"/>
            <label ref="member_name"/>
        </itemset>
    </select>

This avoids using a secondary instance altogether (and all those calculations). If you'd want <value> to an index, you could add a calculation in the repeat and change the ref attribute.

[MartijnR]

Forgot to mention that Enketo updates everything in realtime (even across pages), so there is no 'Finished' state wrt repeats creation.

[enketo-issue-mover]

This issue was moved to enketo/enketo#240

[joeflack4]

That query syntax [./age >= 18] looks great. I first saw this syntax on an ODK Community forum post recently; maybe it was you that posted it. But yeah, it's not supported by the ODK XForm spec / XLSForms currently. When building such logic, I have some special tactics that I use; external text editors using find/replace and multiline cursors, using complicated intermediate Excel functions to do incrementation and interpolations. All kinds of fun.

Thanks for the clarification on the real-time rendering as well.