How to create style condition in Jaspersoft Studio?

Question

How can I put a style condition in Jasper Studio checking if the value is positive put green in foreground, if it is 0 or negative put red in foreground?

I pass the following to the datasource Hashmap:

JRDataSource jrDataMovimentacoes = new JRBeanCollectionDataSource(movimentacoes);
    BigDecimal jrSumLancamentos = lancamentoDao.getLancamentoSum(parameters);

    if(MoneyUtil.getStringMoneyValueWithComma(jrSumLancamentos).startsWith("-")){
        params.put("movSumValidator", "NEGATIVE");
    }else {
        params.put("movSumValidator", "POSITIVE");
    }

    params.put("movimentacoesSum", MoneyUtil.getStringMoneyValueWithComma(jrSumLancamentos));

Condition I put in the style:

<style name="MovSumValidator">
    <conditionalStyle>
        <conditionExpression><![CDATA[$P{movSumValidator}.equals("NEGATIVE")]]></conditionExpression>
        <style mode="Opaque" forecolor="#C70704" backcolor="#FFFFFF">
            <pen lineStyle="Solid" lineColor="#030302"/>
            <box>
                <topPen lineWidth="0.1"/>
                <leftPen lineWidth="0.1"/>
                <bottomPen lineWidth="0.1"/>
                <rightPen lineWidth="0.1"/>
            </box>
        </style>
    </conditionalStyle>
    <conditionalStyle>
        <conditionExpression><![CDATA[$P{movSumValidator}.equals("POSITIVE")]]></conditionExpression>
        <style mode="Opaque" forecolor="#1AB305" backcolor="#FFFFFF">
            <box>
                <topPen lineWidth="0.1" lineColor="#000000"/>
                <leftPen lineWidth="0.1" lineColor="#000000"/>
                <bottomPen lineWidth="0.1" lineColor="#000000"/>
                <rightPen lineWidth="0.1" lineColor="#000000"/>
            </box>
        </style>
    </conditionalStyle>
</style>

Field showing the positive or negative value with the given colour:

<textField pattern="">
            <reportElement key="" style="MovSumValidator" positionType="Float" mode="Transparent" x="638" y="190" width="164" height="15" forecolor="#000000" uuid="1eb194f9-c922-45ea-8f6a-1d3b4fd7a425">
                <property name="com.jaspersoft.studio.unit.width" value="pixel"/>
            </reportElement>
            <box>
                <topPen lineWidth="0.1" lineColor="#000000"/>
                <leftPen lineWidth="0.1" lineColor="#000000"/>
                <bottomPen lineWidth="0.1" lineColor="#000000"/>
                <rightPen lineWidth="0.0" lineColor="#000000"/>
            </box>
            <textElement textAlignment="Right" verticalAlignment="Middle">
                <font size="8"/>
                <paragraph rightIndent="2"/>
            </textElement>
            <textFieldExpression><![CDATA[$P{movimentacoesSum}]]></textFieldExpression>
        </textField>

In summary, I check in the service if the value is positive or negative and pass an additional parameter in the hashmap.

Still nothing happens, the report is printed without validating what I did.

Answer 1

1. Create a new style

2. Select the new style created, and change its name as shown below

3. Right-click on the new style created and then click on create new conditional style as follows in the images...

4. Right-click on the new matching style created and then click on show properties

5. Select the "Style" tab in conditional expression.

6. In the expression you can put the condition you want, in the image below is illustrated your need.

7. Change to the Appearance tab and select the desired color to "Foreground".

8. Repeat the process to create the condition for the other color.

9. Apply the style created in the desired field as shown below.

10. Execute the report and you will get the expected result.