Json array as comma separated values using JSONQL in JRXML - json

Question

We have input json to jrxml as
{
"ID": "5c2c7662f256a1452b0ed8b2",
"MarketData": {
"markets": [ { "id": "1001", "name": "val1" }, { "id": "1002", "name": "Val2" }, { "id": "1003", "name": "val3" } ],
"products": [
{"id": "1001", "proname": "shoe"},
{"id": "1002", "name": "bag"},
{"id": "1003", "name": "cap"}
],
"location":"ABC"
}
}
We have json that contains list of values of markets, products .
We need to show values from this json as
Location : ABC
Markets : val1,Val2,val3
Products Sold: shoes,bag,cap
Using this solution provided here i am able to display Markets as comma separated values Jasper converting list of values of json to comma separated values using jsonQL
Same technique if i use subdataset and display i get output as
Location : ABC
Markets : val1
val1,val2
val1,val2,val3
Products : shoes
shoes,bag
shoes,bag,cap
i declared the main data set as
<queryString language="jsonql">
<![CDATA[]]>
</queryString>
<field name="location" class="java.lang.String">
<property name="net.sf.jasperreports.jsonql.field.expression" value="location"/>
<fieldDescription><![CDATA[location]]></fieldDescription>
</field>
then subdataset as markets as
<subDataset name="marketList" uuid="01e76955-f29e-4d52-991b-aa0149bfdb37">
<field name="name" class="java.lang.String">
<property name="net.sf.jasperreports.jsonql.field.expression" value="name"/>
</field>
<variable name="allname" class="java.lang.String">
<variableExpression><![CDATA[$V{allname} != null ? $V{allname} + ", " + $F{name} : $F{name}]]></variableExpression>
</variable>
</subDataset>
referenced these fields in jrxml as
<jr:list xmlns:jr="http://jasperreports.sourceforge.net/jasperreports/components" xsi:schemaLocation="http://jasperreports.sourceforge.net/jasperreports/components http://jasperreports.sourceforge.net/xsd/components.xsd" printOrder="Vertical">
<datasetRun subDataset="marketList" uuid="565f0c3a-76b6-4527-b0d2-d306c5f4e20c">
<dataSourceExpression><![CDATA[((net.sf.jasperreports.engine.data.JsonQLDataSource)$P{REPORT_DATA_SOURCE}).subDataSource("$.MarketData.markets")]]></dataSourceExpression>
</datasetRun>
<jr:listContents height="16" width="103">
<textField>
<reportElement x="0" y="0" width="100" height="16" uuid="7f2eaa2a-20b5-4598-bbf1-758f61dc3fc8"/>
<textFieldExpression><![CDATA[$V{allname}]]></textFieldExpression>
</textField>
</jr:listContents>
</jr:list>
this gives output as
Markets : val1
val1,val2
val1,val2,val3
however expected output is
Location : ABC
Markets : val1,val2,val3
Products :shoes,bag,cap
How to show subdataset that has list of values as comma separated values .
Thanks
Anjana

Answer 1

In your list's textField you could set the evaluation time to something like Page or Report and display it only for the first record, something like so:
<jr:listContents height="0" width="180">
<frame>
<reportElement x="0" y="0" width="100" height="0" uuid="3c9872d0-ef6c-4643-9cf9-e78bc6996d3e">
<property name="ShowOutOfBoundContent" value="true"/>
<printWhenExpression><![CDATA[$V{REPORT_COUNT} == 1]]></printWhenExpression>
</reportElement>
<textField evaluationTime="Report">
<reportElement x="0" y="0" width="100" height="16" uuid="f5a23577-4e57-4542-81a4-06ed679be920"/>
<textFieldExpression><![CDATA[$V{allname}]]></textFieldExpression>
</textField>
</frame>
</jr:listContents>
The textField is wrapped in a 0 height frame to avoid unnecessary white space generation inside the list.