Question

How to skip some rows to be displayed using dataTable:

<h:dataTable cellspacing="0" id="dogs" value="#{dogBean.dogs}" var="dog" rendered="#{dogBeans.dogs != null}">

<h:column id="nameColumn">

    <h:outputText value="#{dog.name}"/>
</h:column>

<h:column id="breedColumn">

    <h:outputText value="#{dog.breed}"/>
</h:column>

</h:dataTable>

I want to display all dogs, but those how have an age greater than 10.
dog.age > 10.

I’m using Seam.

Answer 1

You can’t do this nicely in the view side. You can at most set the rendered attribute of every cell contents to false, but this doesn’t avoid the <tr> element being rendered. You would see a blank row and its appearance may not be consistent among browsers.

Best is to filter the rows beforehand in the (post)construct, action(listener) or maybe lazily in the getter.

List<Dog> dogsOlderThan10 = new ArrayList<Dog>();
for (Dog dog : dogs) {
    if (dog.getAge() > 10) dogsOlderThan10.add(dog);
}

Or, just send a new SQL query returning exactly the data you need.