Non rendered p:dataTable ends up in pe:exporter PDF - jsf

Question

I have 2 dataTables:
<p:dataTable id="tbl1" var="prop1" value="#{bean.prop1}" rendered="#{bean.listP1.size() != 0}">
// ...
</p:dataTable>
and
<p:dataTable id="tbl2" var="prop2" value="#{bean.prop2}" rendered="#{bean.listP2.size() != 0}">
// ...
</p:dataTable>
On XHTML page, after some action, I got the correct result depending on the size of both listP1 and listP2.
My problem is after clicking on export button
<h:commandLink>
<p:graphicImage value="/resources/icons/download.png" style="width : 35px; height:35px"/>
<pe:exporter type="pdf" target="tbl1, tbl2" fileName="SurveyResults"/>
</h:commandLink>
I got wrong result : I got the two tables instead of one because one of them is with size = 0
Have you please any idea about solving that?

Answer 1

Prior to version 8, the pe:exporter does not care whether the data tables you provide are rendered or not, see https://github.com/primefaces-extensions/primefaces-extensions.github.com/issues/757
If you are not on version 8 yet, you can use EL to create a dynamic value for the target attribute though. For example:
<pe:exporter type="pdf"
target="#{empty bean.listP1 ? '' : 'tbl1'}#{empty bean.listP1 or empty bean.listP2 ? '' : ','}#{empty bean.listP2 ? '' : 'tbl2'}"
fileName="SurveyResults"/>
As these expressions are a bit hairy, you might want to create a method in your bean which creates a target string and do:
<pe:exporter type="pdf"
target="#{bean.exporterTargets}"
fileName="SurveyResults"/>
And in your bean for example:
public String getExporterTargets() {
return Stream.of(listP1.isEmpty() ? null : "tbl1",
listP2.isEmpty() ? null : "tbl2")
.filter(Objects::nonNull)
.collect(Collectors.joining(","));
}