How to send parameters from master report to chart (Line graph) in Jasper? - charts

Question

I am generating a report having a table and a Line graph.
The master report dataset returns 8 records. So, I need 8 pages with each page displaying data for each record. I have mapped the field from master dataset to both the table and line graph's dataset.
The table is displayed 8 times perfectly with the correct param value.
But, the line graph always shows data for the last parameter value.
Jrxml Content:
<?xml version="1.0" encoding="UTF-8"?>
<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="chart" pageWidth="595" pageHeight="842" columnWidth="555" leftMargin="20" rightMargin="20" topMargin="20" bottomMargin="20" uuid="66962ca4-5579-453f-a9fe-5d7284566dc1">
<subDataset name="chartDS" uuid="74b2bdf1-5e99-43ec-94c6-f6c999ea449c">
<parameter name="deviceId" class="java.lang.Long"/>
<queryString language="SQL">
<![CDATA[SELECT
ticket.descr,
IFNULL(SUM(diff)/60, 0) as duration,
DATE(ticket.created_date) as date
FROM
(SELECT
t.id, t.created_date, t.restored_date, E.descr,TIMESTAMPDIFF(SECOND,t.created_date,t.restored_date) as diff
FROM
ticket t
Inner JOIN (SELECT DISTINCT
description AS descr
FROM
alarm_config
WHERE
enabled = 1
AND site_location_device_id = $P{deviceId} ) E ON t.description LIKE CONCAT('%', E.descr, '%')
AND t.site_location_device_id = $P{deviceId}
ORDER BY E.descr) ticket
GROUP BY ticket.descr, DATE(ticket.created_date)
ORDER BY DATE(ticket.created_date)]]>
</queryString>
<field name="descr" class="java.lang.String"/>
<field name="duration" class="java.math.BigDecimal"/>
<field name="date" class="java.sql.Date"/>
</subDataset>
<queryString language="SQL">
<![CDATA[SELECT
sl.location_name,sld.id as deviceId ,sld.name
FROM
site
INNER JOIN
site_location sl ON site.id = sl.site_id
INNER JOIN
site_location_device sld ON sl.id = sld.site_location_id
where site_id = 32 and sld.device_type_id = (SELECT id FROM device_type WHERE name LIKE 'HSS')
]]>
</queryString>
<field name="location_name" class="java.lang.String"/>
<field name="deviceId" class="java.lang.Long"/>
<field name="name" class="java.lang.String"/>
<detail>
<band height="273" splitType="Stretch">
<barChart>
<chart evaluationTime="Report">
<reportElement x="20" y="23" width="514" height="200" uuid="53f820c6-7e46-4052-bcdf-65d3a4b9cf15"/>
<chartTitle>
<titleExpression><![CDATA[$F{deviceId}]]></titleExpression>
</chartTitle>
<chartSubtitle/>
<chartLegend/>
</chart>
<categoryDataset>
<dataset>
<datasetRun subDataset="chartDS" uuid="94e17f1e-b5a7-4b22-9864-481fc0adf56b">
<datasetParameter name="deviceId">
<datasetParameterExpression><![CDATA[$F{deviceId}]]></datasetParameterExpression>
</datasetParameter>
<connectionExpression><![CDATA[$P{REPORT_CONNECTION}]]></connectionExpression>
</datasetRun>
</dataset>
<categorySeries>
<seriesExpression><![CDATA[$F{descr}]]></seriesExpression>
<categoryExpression><![CDATA[$F{date}]]></categoryExpression>
<valueExpression><![CDATA[$F{duration}]]></valueExpression>
</categorySeries>
</categoryDataset>
<barPlot>
<plot labelRotation="54.0"/>
<itemLabel/>
<categoryAxisFormat labelRotation="54.0">
<axisFormat labelColor="#000000" tickLabelColor="#000000" axisLineColor="#000000"/>
</categoryAxisFormat>
<valueAxisFormat>
<axisFormat labelColor="#000000" tickLabelColor="#000000" axisLineColor="#000000"/>
</valueAxisFormat>
</barPlot>
</barChart>
</band>
</detail>
</jasperReport>
PS: Both table and graph are in the detail section.
Also, I am trying this from eclipse - report designer plugin

Answer 1

Finally, I managed to solve the problem.
The issue was with the evaluation time of the chart's expression.
It was by mistake set to "Report".I changed it to "Now".
Replaced this
<chart evaluationTime="Report">
with below
<chart evaluationTime="Now">
evaluationTime − Determines when the chart's expression will be evaluated. Values could be Now, Report, Page, Column, Group, Band. The default value is Now