在JasperReports中动态添加textField

Question

Is there a way to dynamically add textFields to the columnFooter in a Jasper Report.

I have situation where I might have to use:

  <columnFooter>
      <band height="21" splitType="Stretch">
        <textField isStretchWithOverflow="true">
            <reportElement x="0" y="0" width="50" height="21"/>
            <textElement textAlignment="Center" verticalAlignment="Middle"/>
            <textFieldExpression><![CDATA["Example text...."]]></textFieldExpression>
        </textField>
      </band>

or

      <columnFooter>
      <band height="42" splitType="Stretch">
        <textField isStretchWithOverflow="true">
            <reportElement x="0" y="0" width="50" height="21"/>
            <textElement textAlignment="Center" verticalAlignment="Middle"/>
            <textFieldExpression><![CDATA["Example text...."]]></textFieldExpression>
        </textField>            <textField isStretchWithOverflow="true">
            <reportElement x="0" y="0" width="50" height="21"/>
            <textElement textAlignment="Center" verticalAlignment="Middle"/>
            <textFieldExpression><![CDATA["More example text...."]]></textFieldExpression>
        </textField>
      </band>

(Or add any number of textFields. Since I do not know how many will be added, I need to dynamically resize the band somehow) I'm looking for a way to dynamically do this in Java and not have to hardcode it in the jrxml file. Thanks

Answer 1

使用第二种方法在textFields上设置PrintWhenExpression并在此textFields的属性上设置“在空白时删除行”复选框。

Answer 2

If your report is created dynamically as JRDesign you can use the following:

JRDesignBand band = (JRDesignBand) jasperDesign.getColumnFooter();
        JRDesignTextField textField = new JRDesignTextField();
        textField.setX(0);
        textField.setY(0);
        band.addElement(textField);

Answer 3

I'm sorry to say but after years of working with JR Java API I have a feeling it was designed to print over fixed layout of document. What could help in your case: if you know max number of fields that might appear, just add all them to the band, and set "remove line when blank" flag to true for each of them. It will collapse unused fields.