How to send multiple datasets using node-jasper library? - jasper-reports

Question

I have a task to generate PDFs with nodeJS, so i am working with the node-jasper library.
what i want to know is how can i send multiple datasets in order to fill multiple charts. I can only send one dataset (the main dataset):/
here is my complete code:
const express = require('express')
var fs = require('fs')
const app = express()
const port = 5000
var jasper = require('node-jasper')({
path: './lib/jasperreports-6.10.0',
reports: {
hw: {
jasper: './jasperFiles/test.jasper',
jrxml: './reports/test.jrxml',
conn: 'in_memory_json'
}
},
});
app.get('/jasper1', (req, res) => {
var report = {
report: 'hw',
data: {
title: "test title",
dataset1: jasper.toJsonDataSource(
{
dados: [
{
c: "ar",
x: 'Arabe',
y: 20,
},
{
c: "en",
x: 'English',
y: 40,
}
]
},
'dados'
),
dataset2: jasper.toJsonDataSource(
{
dados: [
{
c: "eu",
x: 'Euro',
y: 15,
},
{
c: "usd",
x: 'Dollar',
y: 35,
}
]
},
'dados'
)
}
,
dataset:{},
}
var pdf = jasper.pdf(report);
res.set({
'Content-type': 'application/pdf',
'Content-Length': pdf.length
});
res.send(pdf)
});
app.listen(port, () => {
console.log('app is runing on port: ', port)
})
This the the report Design:
enter image description here
And This is the two datasets that i have created:
enter image description here
and this is my jrxml file:
<?xml version="1.0" encoding="UTF-8"?>
<!-- Created with Jaspersoft Studio version 6.10.0.final using JasperReports Library version 6.10.0-unknown -->
<jasperReport xmlns="http://jasperreports.sourceforge.net/jasperreports" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://jasperreports.sourceforge.net/jasperreports http://jasperreports.sourceforge.net/xsd/jasperreport.xsd" name="test" pageWidth="595" pageHeight="842" columnWidth="555" leftMargin="20" rightMargin="20" topMargin="20" bottomMargin="20" uuid="d2376d66-daf9-486d-877e-cc7f2fe28426">
<property name="com.jaspersoft.studio.data.defaultdataadapter" value="One Empty Record"/>
<subDataset name="dataset1" uuid="80298b05-e1fd-427e-b7b5-c6a9e571d151">
<property name="com.jaspersoft.studio.data.defaultdataadapter" value="One Empty Record"/>
<queryString>
<![CDATA[]]>
</queryString>
<field name="x" class="java.lang.String"/>
<field name="y" class="java.lang.Integer"/>
<field name="c" class="java.lang.String"/>
</subDataset>
<subDataset name="dataset2" uuid="a4f9409d-a1fa-45a5-a00b-d2f95b31573e">
<queryString>
<![CDATA[]]>
</queryString>
<field name="x" class="java.lang.String"/>
<field name="y" class="java.lang.Integer"/>
<field name="c" class="java.lang.String"/>
</subDataset>
<parameter name="title" class="java.lang.String"/>
<queryString>
<![CDATA[]]>
</queryString>
<background>
<band splitType="Stretch"/>
</background>
<columnHeader>
<band height="64" splitType="Stretch">
<staticText>
<reportElement x="50" y="0" width="103" height="64" uuid="6f999744-c4f9-48ef-a587-677dc644d77d"/>
<textElement>
<font size="26"/>
</textElement>
<text><![CDATA[Title]]></text>
</staticText>
<textField>
<reportElement x="140" y="10" width="100" height="30" uuid="e5a12f91-ddb4-445b-9f5b-57093703abaa"/>
<textFieldExpression><![CDATA[$P{title}]]></textFieldExpression>
</textField>
</band>
</columnHeader>
<detail>
<band height="604" splitType="Stretch">
<property name="com.jaspersoft.studio.layout" value="com.jaspersoft.studio.editor.layout.HorizontalRowLayout"/>
<pieChart>
<chart evaluationTime="Report">
<reportElement x="0" y="0" width="278" height="604" uuid="49052c41-6b67-42ed-9c84-c3089d3b2411"/>
<chartTitle/>
<chartSubtitle/>
<chartLegend/>
</chart>
<pieDataset maxCount="10">
<dataset>
<datasetRun subDataset="dataset1" uuid="7466bccc-a18d-4c68-801f-caac7533de69"/>
</dataset>
<keyExpression><![CDATA[$F{c}]]></keyExpression>
<valueExpression><![CDATA[$F{y}]]></valueExpression>
<labelExpression><![CDATA[$F{x}]]></labelExpression>
</pieDataset>
<piePlot>
<plot/>
<itemLabel/>
</piePlot>
</pieChart>
<pieChart>
<chart evaluationTime="Report">
<reportElement x="278" y="0" width="277" height="604" uuid="9f438f49-3f14-44b9-81a4-5f475ff6ecb2"/>
<chartTitle/>
<chartSubtitle/>
<chartLegend/>
</chart>
<pieDataset maxCount="10">
<dataset>
<datasetRun subDataset="dataset2" uuid="ce453374-bcf5-4b02-b8d9-35b263f143bc"/>
</dataset>
<keyExpression><![CDATA[$F{c}]]></keyExpression>
<valueExpression><![CDATA[$F{y}]]></valueExpression>
<labelExpression><![CDATA[$F{x}]]></labelExpression>
</pieDataset>
<piePlot>
<plot/>
<itemLabel/>
</piePlot>
</pieChart>
</band>
</detail>
<summary>
<band height="67" splitType="Stretch">
<staticText>
<reportElement x="180" y="10" width="151" height="51" uuid="da960c22-4947-49e0-9185-d2d39e21bcd7"/>
<textElement>
<font size="26"/>
</textElement>
<text><![CDATA[Footer]]></text>
</staticText>
</band>
</summary>
</jasperReport>
The problem is that when i run my code, the charts does not appear in the generated PDF, is this the right way to send datasets values ?
Can you help please ?

Answer 1

You need to declare the dataset1 and dataset2 parameters in the report and send them as data sources for the two chart subdatasets.
Like this (see the parameter definitions and the dataSourceExpression under datasetRun):
<parameter name="title" class="java.lang.String"/>
<parameter name="dataset1" class="net.sf.jasperreports.engine.JRDataSource"/>
<parameter name="dataset2" class="net.sf.jasperreports.engine.JRDataSource"/>
...
<detail>
<band height="604" splitType="Stretch">
<property name="com.jaspersoft.studio.layout" value="com.jaspersoft.studio.editor.layout.HorizontalRowLayout"/>
<pieChart>
<chart evaluationTime="Report">
<reportElement x="0" y="0" width="278" height="604" uuid="49052c41-6b67-42ed-9c84-c3089d3b2411"/>
<chartTitle/>
<chartSubtitle/>
<chartLegend/>
</chart>
<pieDataset maxCount="10">
<dataset>
<datasetRun subDataset="dataset1" uuid="7466bccc-a18d-4c68-801f-caac7533de69">
<dataSourceExpression><![CDATA[$P{dataset1}]]></dataSourceExpression>
</datasetRun>
</dataset>
<keyExpression><![CDATA[$F{c}]]></keyExpression>
<valueExpression><![CDATA[$F{y}]]></valueExpression>
<labelExpression><![CDATA[$F{x}]]></labelExpression>
</pieDataset>
<piePlot>
<plot/>
<itemLabel/>
</piePlot>
</pieChart>
<pieChart>
<chart evaluationTime="Report">
<reportElement x="278" y="0" width="277" height="604" uuid="9f438f49-3f14-44b9-81a4-5f475ff6ecb2"/>
<chartTitle/>
<chartSubtitle/>
<chartLegend/>
</chart>
<pieDataset maxCount="10">
<dataset>
<datasetRun subDataset="dataset2" uuid="ce453374-bcf5-4b02-b8d9-35b263f143bc">
<dataSourceExpression><![CDATA[$P{dataset2}]]></dataSourceExpression>
</datasetRun>
</dataset>
<keyExpression><![CDATA[$F{c}]]></keyExpression>
<valueExpression><![CDATA[$F{y}]]></valueExpression>
<labelExpression><![CDATA[$F{x}]]></labelExpression>
</pieDataset>
<piePlot>
<plot/>
<itemLabel/>
</piePlot>
</pieChart>
</band>
</detail>