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How to conditionally render an element with JasperReports?

I want to render a specific element in my jasper report only if a specific condition is met in my data model, what is the best way to achieve this?

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Authorยดs Dominik Sumer image

Dominik Sumer

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In my specific case it helped to add a <printWhenExpression> element as a child of the <band> element I wanted to hide conditionally.

You can write an expression into the <printWhenExpression> Tag and only when this expression is met the element will be rendered. Here is an example where the expression checks if the specific String as hat least one character.

<band>
  <printWhenExpression><![CDATA[$F{myString}.length() > 0]]></printWhenExpression>
  ...
</b>
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