Calculate using a field from a cascading select instance

Support
1

I want to populate two nodes with the answer from a select 1 question in a cascading select.

I'm trying to use the calculate function in the bind for the second node.

<h:head>
<h:title>Cascading Regional</h:title>

	<instance>
		<cr id="cascading_regional_0.3" version="2015081701">
			<activity/>
		</cr>
	</instance>
	
	<instance id="activity">
		<root>
			<item>
				<value>Repair Pothole (201)</value>
				<name>repair_pothole_201</name>
				<unitl>Each</unitl>
				<unitv>each</unitv>
			</item>
			<item>
		</root>
	</instance>
	
	<bind nodeset="/cr/activity" type="select1"/>
	<bind nodeset="/cr/quantity_and_units/unit" calculate="instance('activity')/root/item/unitv [name= /cr/activity ]" type="string"/>
</model>

</h:head>

<h:body>

<select1 ref="/cr/activity">
	<label>Activity</label>
		<itemset nodeset="instance('activity')/root/item">
			<value ref="name"/>
			<label ref="value"/>
		</itemset>
</select1>

</h:body>
</h:html>

Is this possible or should I be using a different method?

2

(I deleted your other post -- both questions have the same answer)

This is a quirk of XPath. In this bind:

<bind nodeset="/cr/quantity_and_units/unit"
calculate="instance('activity')/root/item/unitv
[name= /cr/activity]" type="string"/>

The selection condition (in bold above) is evaluated in the context of the
instance('activity').

So it is looking for 'name' under the instance('activity'
)/root/item/unitv node.
But it is also looking for '/cr/activity' under the instance('activity')
root-level node.

When writing these formulas, you need to explicitly specify whether the
field is in the main (un-named) instance, or one of these read-only named
instances. The correct expression is:

<bind nodeset="/cr/quantity_and_units/unit"
calculate="instance('activity')/root/item/unitv
[*name= instance()/cr/activity* ]" type="string"/>

This also applies to expressions like position(..) -- you need to write
this as position(instance()..)
Not sure if that parses correctly. If not, you can always store
position(..) in a field, then reference that field.

Note that *instance()foo *will reference the 'foo' field in the current
repeat group.

··· On Sun, Aug 16, 2015 at 8:12 PM, wrote:

I want to populate two nodes with the answer from a select 1 question in a
cascading select.

I'm trying to use the calculate function in the bind for the second node.

<h:head>
<h:title>Cascading Regional</h:title>

            <instance>
                    <cr id="cascading_regional_0.3" version="

2015081701">


            <instance id="activity">
                    <root>
                            <item>
                                    <value>Repair Pothole (201)</value>
                                    <name>repair_pothole_201</name>
                                    <unitl>Each</unitl>
                                    <unitv>each</unitv>
                            </item>
                            <item>
                    </root>
            </instance>

            <bind nodeset="/cr/activity" type="select1"/>
            <bind nodeset="/cr/quantity_and_units/unit"

calculate="instance('activity')/root/item/unitv [name= /cr/activity ]"
type="string"/>

</h:head>

<h:body>

    <select1 ref="/cr/activity">
            <label>Activity</label>
                    <itemset nodeset="instance('activity')/root/item">
                            <value ref="name"/>
                            <label ref="value"/>
                    </itemset>
    </select1>

</h:body>
</h:html>

Is this possible or should I be using a different method?

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Mitch Sundt
Software Engineer
University of Washington
mitchellsundt@gmail.com

3

(I deleted your other post -- both questions have the same answer)

This is a quirk of XPath. In this bind:

The selection condition (in bold above) is evaluated in the context of the instance('activity').

So it is looking for 'name' under the instance('activity')/root/item/unitv node.
But it is also looking for '/cr/activity' under the instance('activity') root-level node.

When writing these formulas, you need to explicitly specify whether the field is in the main (un-named) instance, or one of these read-only named instances. The correct expression is:

This also applies to expressions like position(..) -- you need to write this as position(instance()..)
Not sure if that parses correctly. If not, you can always store position(..) in a field, then reference that field.

Note that instance()foo will reference the 'foo' field in the current repeat group.

I want to populate two nodes with the answer from a select 1 question in a cascading select.

I'm trying to use the calculate function in the bind for the second node.

<h:head>

<h:title>Cascading Regional</h:title>

    <model>



            <instance>

                    <cr id="cascading_regional_0.3" version="2015081701">

                            <activity/>

                    </cr>

            </instance>



            <instance id="activity">

                    <root>

                            <item>

                                    <value>Repair Pothole (201)</value>

                                    <name>repair_pothole_201</name>

                                    <unitl>Each</unitl>

                                    <unitv>each</unitv>

                            </item>

                            <item>

                    </root>

            </instance>



            <bind nodeset="/cr/activity" type="select1"/>

            <bind nodeset="/cr/quantity_and_units/unit" calculate="instance('activity')/root/item/unitv [name= /cr/activity ]" type="string"/>

    </model>

</h:head>

<h:body>

    <select1 ref="/cr/activity">

            <label>Activity</label>

                    <itemset nodeset="instance('activity')/root/item">

                            <value ref="name"/>

                            <label ref="value"/>

                    </itemset>

    </select1>

</h:body>

</h:html>

Is this possible or should I be using a different method?

--

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Mitch Sundt
Software Engineer
University of Washington
mitche...@gmail.com

Thanks heaps Mitch, it even makes sense to this noob.

Richard

··· On Tuesday, 18 August 2015 03:21:03 UTC+10, Mitch Sundt wrote: > On Sun, Aug 16, 2015 at 8:12 PM, wrote:
4

(I deleted your other post -- both questions have the same answer)

This is a quirk of XPath. In this bind:

The selection condition (in bold above) is evaluated in the context of the instance('activity').

So it is looking for 'name' under the instance('activity')/root/item/unitv node.
But it is also looking for '/cr/activity' under the instance('activity') root-level node.

When writing these formulas, you need to explicitly specify whether the field is in the main (un-named) instance, or one of these read-only named instances. The correct expression is:

This also applies to expressions like position(..) -- you need to write this as position(instance()..)
Not sure if that parses correctly. If not, you can always store position(..) in a field, then reference that field.

Note that instance()foo will reference the 'foo' field in the current repeat group.

I want to populate two nodes with the answer from a select 1 question in a cascading select.

I'm trying to use the calculate function in the bind for the second node.

<h:head>

<h:title>Cascading Regional</h:title>

    <model>



            <instance>

                    <cr id="cascading_regional_0.3" version="2015081701">

                            <activity/>

                    </cr>

            </instance>



            <instance id="activity">

                    <root>

                            <item>

                                    <value>Repair Pothole (201)</value>

                                    <name>repair_pothole_201</name>

                                    <unitl>Each</unitl>

                                    <unitv>each</unitv>

                            </item>

                            <item>

                    </root>

            </instance>



            <bind nodeset="/cr/activity" type="select1"/>

            <bind nodeset="/cr/quantity_and_units/unit" calculate="instance('activity')/root/item/unitv [name= /cr/activity ]" type="string"/>

    </model>

</h:head>

<h:body>

    <select1 ref="/cr/activity">

            <label>Activity</label>

                    <itemset nodeset="instance('activity')/root/item">

                            <value ref="name"/>

                            <label ref="value"/>

                    </itemset>

    </select1>

</h:body>

</h:html>

Is this possible or should I be using a different method?

--

--

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Mitch Sundt
Software Engineer
University of Washington
mitche...@gmail.com

[name= instance()/cr/activity ]

gave the below error in ODK validate?

org.javarosa.xpath.XPathUnsupportedException: XPath evaluation: unsupported construct [instance() function used with 0 arguements. Expecting 1 arguement]

··· On Tuesday, 18 August 2015 03:21:03 UTC+10, Mitch Sundt wrote: > On Sun, Aug 16, 2015 at 8:12 PM, wrote:
5

Argh! So much for writing responses from memory!

The two forms are:

current()

and

instance('instancename')

So wherever I said instance(), replace that with current()

Sorry.

··· On Mon, Aug 17, 2015 at 3:28 PM, wrote:

On Tuesday, 18 August 2015 03:21:03 UTC+10, Mitch Sundt wrote:

(I deleted your other post -- both questions have the same answer)

This is a quirk of XPath. In this bind:

The selection condition (in bold above) is evaluated in the context of
the instance('activity').

So it is looking for 'name' under
the instance('activity')/root/item/unitv node.
But it is also looking for '/cr/activity' under the instance('activity')
root-level node.

When writing these formulas, you need to explicitly specify whether the
field is in the main (un-named) instance, or one of these read-only named
instances. The correct expression is:

This also applies to expressions like position(..) -- you need to write
this as position(instance()..)
Not sure if that parses correctly. If not, you can always store
position(..) in a field, then reference that field.

Note that instance()foo will reference the 'foo' field in the current
repeat group.

On Sun, Aug 16, 2015 at 8:12 PM, richard...@gmail.com wrote:
I want to populate two nodes with the answer from a select 1 question in
a cascading select.

I'm trying to use the calculate function in the bind for the second node.

<h:head>

<h:title>Cascading Regional</h:title>

    <model>



            <instance>

                    <cr id="cascading_regional_0.3" version="

2015081701">

                            <activity/>

                    </cr>

            </instance>



            <instance id="activity">

                    <root>

                            <item>

                                    <value>Repair Pothole

(201)

                                    <name>repair_pothole_201</name>

                                    <unitl>Each</unitl>

                                    <unitv>each</unitv>

                            </item>

                            <item>

                    </root>

            </instance>



            <bind nodeset="/cr/activity" type="select1"/>

            <bind nodeset="/cr/quantity_and_units/unit"

calculate="instance('activity')/root/item/unitv [name= /cr/activity ]"
type="string"/>

    </model>

</h:head>

<h:body>

    <select1 ref="/cr/activity">

            <label>Activity</label>

                    <itemset

nodeset="instance('activity')/root/item">

                            <value ref="name"/>

                            <label ref="value"/>

                    </itemset>

    </select1>

</h:body>

</h:html>

Is this possible or should I be using a different method?

--

--

Post: opend...@googlegroups.com

Unsubscribe: opendatakit...@googlegroups.com

Options: http://groups.google.com/group/opendatakit?hl=en

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Groups "ODK Community" group.

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For more options, visit https://groups.google.com/d/optout.

--

Mitch Sundt
Software Engineer
University of Washington
mitche...@gmail.com

[name= instance()/cr/activity ]

gave the below error in ODK validate?

org.javarosa.xpath.XPathUnsupportedException: XPath evaluation:
unsupported construct [instance() function used with 0 arguements.
Expecting 1 arguement]

--

Post: opendatakit@googlegroups.com
Unsubscribe: opendatakit+unsubscribe@googlegroups.com
Options: http://groups.google.com/group/opendatakit?hl=en

You received this message because you are subscribed to the Google Groups
"ODK Community" group.
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email to opendatakit+unsubscribe@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.

--
Mitch Sundt
Software Engineer
University of Washington
mitchellsundt@gmail.com