Java EE (Java Enterprise Edition) General Discussion

Hello,
I want ask, how can I render datatable rows in JSF page dynamic. I need to render rows only when category.visible is true. When I put condition in commandLink, I have unwanted spaces between rows. Can anyone help my?

Thank you.

<h:dataTable id="categoryList" value="#{categories.categoriesbyOrder}" var="category" styleClass="categoryTable" rendered="#{documents.clicked}">
<h:column>
<h:commandLink actionListener="#{documents.listOfFiles}" ondblclick="return false;" styleClass="mediumText"
render="#{category.vidible}">
<h:graphicImage value="../images/erbSM.jpg" styleClass="noBorder" />
<f:param name="action" value="fileList"/>
<f:param name="categoryID" value="#{category.id}"/>
<h:outputText value=" #{category.name} [#{category.docsCount}]" styleClass="mediumText"/>
</h:commandLink>
</h:column>
</h:dataTable>