How to repeat textfield by parameter in jaspersoft? - jasper-reports

Question

I have a text for a document, that can repeat itself for more than 100 times, what I was trying to do is putting a lot of textfield's and then putting a print when expression so that only the quantity of the parameters that I gave would repeat.
The problem is that it can repeat more times than I thought. I like to pass as parameter the number of times it should repeat, not using datasource.

Answer 1

An easy way to repeat text would be to actually use a datasource, the JREmptyDataSource in constructor you can define how many records you like.
I will show an example using the jr:list component to repeat text, but you could use the jr:table component or a subreport instead.
Pass to this component an empty datasource with the number of records you like (hence the parameter defined):
<dataSourceExpression><![CDATA[new net.sf.jasperreports.engine.JREmptyDataSource($P{NR_REPEAT})]]></dataSourceExpression>
Full jrxml
<?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="Blank_A4" pageWidth="595" pageHeight="842" columnWidth="555" leftMargin="20" rightMargin="20" topMargin="20" bottomMargin="20" uuid="716e18ba-d975-40fa-9be2-89f43a4ab69c">
<property name="com.jaspersoft.studio.data.defaultdataadapter" value="One Empty Record"/>
<subDataset name="RepeatDataset" uuid="185d5db2-6f6b-4c9a-9905-e7a554b6a8fa">
<queryString>
<![CDATA[]]>
</queryString>
</subDataset>
<parameter name="NR_REPEAT" class="java.lang.Integer">
<defaultValueExpression><![CDATA[5]]></defaultValueExpression>
</parameter>
<queryString>
<![CDATA[]]>
</queryString>
<title>
<band height="22">
<textField>
<reportElement x="0" y="0" width="260" height="20" uuid="b0a2bf35-f015-4b85-aa87-b5587e48de10"/>
<textElement verticalAlignment="Middle"/>
<textFieldExpression><![CDATA["NR. REPEAT IS: " + $P{NR_REPEAT}]]></textFieldExpression>
</textField>
</band>
</title>
<detail>
<band height="31" splitType="Stretch">
<componentElement>
<reportElement x="0" y="0" width="550" height="22" uuid="0d5f8ed2-c697-4337-b0b0-2411da8cc5fa">
<property name="com.jaspersoft.studio.unit.height" value="px"/>
</reportElement>
<jr:list xmlns:jr="http://jasperreports.sourceforge.net/jasperreports/components" xsi:schemaLocation="http://jasperreports.sourceforge.net/jasperreports/components http://jasperreports.sourceforge.net/xsd/components.xsd" printOrder="Vertical">
<datasetRun subDataset="RepeatDataset" uuid="e98a25f7-2d4e-403e-8199-0d3573bb3a3e">
<dataSourceExpression><![CDATA[new net.sf.jasperreports.engine.JREmptyDataSource($P{NR_REPEAT})]]></dataSourceExpression>
</datasetRun>
<jr:listContents height="22" width="550">
<textField>
<reportElement x="0" y="0" width="550" height="22" uuid="21984a90-5517-4c8b-82f0-1fe682728830">
<property name="com.jaspersoft.studio.unit.height" value="px"/>
</reportElement>
<textElement verticalAlignment="Middle"/>
<textFieldExpression><![CDATA[$V{REPORT_COUNT} + " - Hello world"]]></textFieldExpression>
</textField>
</jr:listContents>
</jr:list>
</componentElement>
</band>
</detail>
</jasperReport>
Output setting NR_REPEAT to 5