is it possible print element only when its detail band is the last on page?

问题

Is it possible, to get a condition, that I can print an element only when its detail band is the last on page in Jasper Reports?

We can have variable saying record number on the page. But how we get the calculated total record on each page?

回答1:

This is done with the "reset type" on a variable

<?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="report1" language="groovy" pageWidth="612" pageHeight="792" columnWidth="612" leftMargin="0" rightMargin="0" topMargin="10" bottomMargin="10" uuid="39852bd8-6125-4359-8d76-06927e7be492">
    <queryString>
        <![CDATA[SELECT ROWNUM N FROM dual  CONNECT BY LEVEL <= 200 ]]>
    </queryString>
    <field name="N" class="java.math.BigDecimal"/>
    <variable name="N_count_page" class="java.lang.Integer" resetType="Page" calculation="Count">
        <variableExpression><![CDATA[$F{N}]]></variableExpression>
    </variable>
    <variable name="N_count_report" class="java.lang.Integer" calculation="Count">
        <variableExpression><![CDATA[$F{N}]]></variableExpression>
    </variable>
    <title>
        <band height="20" splitType="Stretch">
            <textField>
                <reportElement uuid="93284d9f-1ee0-4a15-b227-31b55aa2e48b" x="0" y="0" width="376" height="20"/>
                <textElement textAlignment="Center">
                    <font size="14" isBold="true"/>
                </textElement>
                <textFieldExpression><![CDATA["Page Count"]]></textFieldExpression>
            </textField>
        </band>
    </title>
    <columnHeader>
        <band height="20">
            <staticText>
                <reportElement uuid="a7113fdd-591b-4fee-9123-981ab75c6fa6" mode="Opaque" x="0" y="0" width="100" height="20" forecolor="#FFFFFF" backcolor="#000000"/>
                <textElement/>
                <text><![CDATA[N]]></text>
            </staticText>
        </band>
    </columnHeader>
    <detail>
        <band height="20">
            <textField>
                <reportElement uuid="54bac746-4efb-4412-81bc-b4ba807c60fd" x="0" y="0" width="100" height="20"/>
                <textElement/>
                <textFieldExpression><![CDATA[$F{N}]]></textFieldExpression>
            </textField>
        </band>
    </detail>
    <pageFooter>
        <band height="50">
            <staticText>
                <reportElement uuid="4c685263-0ef7-4a68-a328-39901ef2806f" x="0" y="0" width="100" height="20"/>
                <textElement textAlignment="Right"/>
                <text><![CDATA[Rows on page :]]></text>
            </staticText>
            <textField>
                <reportElement uuid="c65214f1-82dc-476a-8439-087854bbc5c6" x="100" y="0" width="100" height="20"/>
                <textElement/>
                <textFieldExpression><![CDATA[$V{N_count_page}]]></textFieldExpression>
            </textField>
            <textField>
                <reportElement uuid="48b37aff-b169-4ca2-b9dd-30c026988f68" x="289" y="30" width="80" height="20"/>
                <textElement textAlignment="Right"/>
                <textFieldExpression><![CDATA["Page "+$V{PAGE_NUMBER}+" of"]]></textFieldExpression>
            </textField>
            <textField evaluationTime="Report">
                <reportElement uuid="983ccfed-d783-429e-bc6c-3fa488b2e106" x="369" y="30" width="40" height="20"/>
                <textElement/>
                <textFieldExpression><![CDATA[" " + $V{PAGE_NUMBER}]]></textFieldExpression>
            </textField>
        </band>
    </pageFooter>
    <lastPageFooter>
        <band height="64">
            <staticText>
                <reportElement uuid="240e2f86-991a-4fc1-941b-56cc43b28c25" x="0" y="24" width="100" height="20"/>
                <textElement textAlignment="Right"/>
                <text><![CDATA[Rows on report :]]></text>
            </staticText>
            <textField>
                <reportElement uuid="718d4481-4716-4071-9989-27d5119fb428" x="100" y="24" width="100" height="20"/>
                <textElement/>
                <textFieldExpression><![CDATA[$V{N_count_report}]]></textFieldExpression>
            </textField>
            <textField evaluationTime="Report">
                <reportElement uuid="f03359be-3bbe-4da8-9bd8-ac024aa6f289" x="369" y="44" width="40" height="20"/>
                <textElement/>
                <textFieldExpression><![CDATA[" " + $V{PAGE_NUMBER}]]></textFieldExpression>
            </textField>
            <textField>
                <reportElement uuid="ad4aa2c0-9ad8-4892-a16f-0bb584c93916" x="289" y="44" width="80" height="20"/>
                <textElement textAlignment="Right"/>
                <textFieldExpression><![CDATA["Page "+$V{PAGE_NUMBER}+" of"]]></textFieldExpression>
            </textField>
            <staticText>
                <reportElement uuid="b4bdd29a-4ef9-46cc-a57a-df7577bdd73f" x="0" y="0" width="100" height="20"/>
                <textElement textAlignment="Right"/>
                <text><![CDATA[Rows on page :]]></text>
            </staticText>
            <textField>
                <reportElement uuid="39952747-170c-4747-8e2c-0e12ab608ae9" x="100" y="0" width="100" height="20"/>
                <textElement/>
                <textFieldExpression><![CDATA[$V{N_count_page}]]></textFieldExpression>
            </textField>
        </band>
    </lastPageFooter>
</jasperReport>

来源：https://stackoverflow.com/questions/13047905/is-it-possible-print-element-only-when-its-detail-band-is-the-last-on-page