Template:ItemRenderer

Implementing your own (ItemRenderer) can customize how a component renders data in a browser. (For the concepts about component, model, and renderer, please refer to the Model-driven Display section). Notice that ItemRenderer should return an HTML snippet that is different from ListitemRenderer that creates components.

Render an item with a tooltip

public class TooltipRenderer implements ItemRenderer {
    @Override
    public String render(Component owner, Object data, int index) throws Exception {
        return String.format("<span title=\"%s\" style=\"width: 100%%;display: inline-block;\">%s</span>", data, data);
    }
}