A basic definition of the dataScroller component would be as shown here:

<p:dataScroller value="#{dataScrollerBean.cars}" 
  var="car" chunkSize="10">
  #{car.name}
</p:dataScroller>

The data gets loaded with specified chunks where its size is determined with the chunkSize attribute, and then the retrieved content will be appended at the bottom of the component.

The AJAX loading takes place when the page is scrolled down, and this is achieved by monitoring the vertical scrollbar. This can be modified by the mode attribute, which has document as its default value. When its value is set to inline, the component starts to listen to the scroll event of the dataScroller container.