How to set x, y for a textElement in JasperReports depending on if above textElement is empty. And if non-empty show it down to the that textelement - jasper-reports

Question

Requirement:
If firstName and lastName is non empty. Show this at x=125, y=3 coordinates.
And show address down to it at x="125" y="26" coordinate. This is working fine.
Problem: If firstName/lastName are empty, Then we need to move the address element up and show it at x=125, y=3 coordinate itself.
This is where I am stuck. Please help me.
Please refer my jrxml file below:
<frame>
<reportElement key="frame-462" positionType="Float" mode="Transparent" x="0" y="50" width="390" height="70"/>
<textField isStretchWithOverflow="true" isBlankWhenNull="true" evaluationTime="Now">
<reportElement key="textField-844" positionType="Float" mode="Transparent" x="125" y="3" width="264" height="23"
isPrintWhenDetailOverflows="true" isRemoveLineWhenBlank="true">
<printWhenExpression><![CDATA[(!$F{firstName}.isEmpty() && !$F{lastName}.isEmpty())]]></printWhenExpression>
</reportElement>
<textElement markup="styled">
<font fontName="Verdana" size="12"/>
</textElement>
<textFieldExpression>
<![CDATA[$F{firstName} + "<style pdfFontName='Helvetica-Oblique' size='11'>" + $F{lastName} + "</style>"]]></textFieldExpression>
</textField>
<textField isStretchWithOverflow="true" isBlankWhenNull="true" evaluationTime="Now">
<reportElement key="textField-843" mode="Transparent" positionType="Float" x="125" y="26" width="264"
height="42" isRemoveLineWhenBlank="true" isPrintWhenDetailOverflows="true"/>
<textElement markup="html">
<font fontName="Verdana" size="12"/>
</textElement>
<textFieldExpression><![CDATA[$F{address}]]></textFieldExpression>
</textField>
<staticText>
<reportElement key="staticText-1249" positionType="Float" x="2" y="2" width="108" height="21"
isRemoveLineWhenBlank="true"/>
<textElement textAlignment="Left">
<font fontName="Verdana" size="12" isBold="false" pdfFontName="Helvetica-Bold"/>
</textElement>
<text><![CDATA[ Address:]]></text>
</staticText>
</frame>

Answer 1

You have already set the isRemoveLineWhenBlank attribute, which will remove the empty space left by the textField. However, JasperReports cannot collapse vertical space unless that space is completely clear. If there is another element occupying the same line (in your case the staticText element), the empty space will be preserved. This is a bit like playing Tetris in reverse; You have to get rid of all of the blocks before the line will disappear.
Putting report elements into frames modifies this behaviour slightly. It is only the width of the parent frame that needs to be clear, instead of the width of the whole report. Therefore, by putting your name and address fields into a separate frame, the space occupied by the name field can collapse despite being aligned horizontally with the static text. I have modified your code snippet to demonstrate this:
<frame>
<reportElement key="frame-462" positionType="Float" mode="Transparent" x="0" y="50" width="390" height="70"/>
<frame>
<reportElement x="126" y="0" width="264" height="70"/>
<textField isStretchWithOverflow="true" isBlankWhenNull="true" evaluationTime="Now">
<reportElement key="textField-844" positionType="Float" mode="Transparent" x="0" y="3" width="264" height="23" isPrintWhenDetailOverflows="true" isRemoveLineWhenBlank="true">
<printWhenExpression><![CDATA[(!$F{firstName}.isEmpty() && !$F{lastName}.isEmpty())]]></printWhenExpression>
</reportElement>
<textElement markup="styled">
<font fontName="Verdana" size="12"/>
</textElement>
<textFieldExpression><![CDATA[$F{firstName} + "<style pdfFontName='Helvetica-Oblique' size='11'>" + $F{lastName} + "</style>"]]></textFieldExpression>
</textField>
<textField isStretchWithOverflow="true" isBlankWhenNull="true" evaluationTime="Now">
<reportElement key="textField-843" mode="Transparent" positionType="Float" x="0" y="26" width="264" height="42" isRemoveLineWhenBlank="true" isPrintWhenDetailOverflows="true"/>
<textElement markup="html">
<font fontName="Verdana" size="12"/>
</textElement>
<textFieldExpression><![CDATA[$F{address}]]></textFieldExpression>
</textField>
</frame>
<staticText>
<reportElement key="staticText-1249" positionType="Float" x="2" y="2" width="108" height="21" isRemoveLineWhenBlank="true"/>
<textElement textAlignment="Left">
<font fontName="Verdana" size="12" isBold="false" pdfFontName="Helvetica-Bold"/>
</textElement>
<text><![CDATA[ Address:]]></text>
</staticText>
</frame>