ChartTemplate.java

import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.Map;
import javax.faces.event.AjaxBehaviorEvent;
import javax.faces.event.BehaviorEvent;
import javax.faces.event.FacesEvent;
import org.primefaces.event.ItemSelectEvent;

    private final static String DEFAULT_EVENT = "itemSelect";

    private static final Collection<String> EVENT_NAMES = Collections.unmodifiableCollection(Arrays.asList(DEFAULT_EVENT));

    @Override
    public Collection<String> getEventNames() {
        return EVENT_NAMES;
    }

    @Override
    public String getDefaultEventName() {
        return DEFAULT_EVENT;
    }
    
    @Override
    public void queueEvent(FacesEvent event) {
        if(event instanceof AjaxBehaviorEvent) {
            BehaviorEvent behaviorEvent = (AjaxBehaviorEvent) event;
            Map<String,String> map = getFacesContext().getExternalContext().getRequestParameterMap();
            int itemIndex = Integer.parseInt(map.get("itemIndex"));
            int seriesIndex = Integer.parseInt(map.get("seriesIndex"));

            ItemSelectEvent itemSelectEvent = new ItemSelectEvent(this, behaviorEvent.getBehavior(), itemIndex, seriesIndex);

            super.queueEvent(itemSelectEvent);
        }
    }