ClientSideValidatorHandler.java

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package guessnumber;

import java.io.IOException;

import java.io.Serializable;
import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.event.AbortProcessingException;
import javax.faces.event.ComponentSystemEvent;
import javax.faces.event.ComponentSystemEventListener;
import javax.faces.event.PreRenderComponentEvent;

import javax.faces.view.facelets.FaceletContext;
import javax.faces.view.facelets.ValidatorConfig;
import javax.faces.view.facelets.ValidatorHandler;


/**
 * <p>A custom ValidateHandler that registers the created Validator as
 * a listener for the <code>PreRenderComponentEvent</code> so that the Validator
 * can take custom action upon the rendering of the parent component.</p>
 *
 * NOTE:  These APIs <em>WILL</em> be changing so if you write similar code,
 * expect breakage when the next EDR comes out.
 */
public class ClientSideValidatorHandler extends ValidatorHandler {

    public ClientSideValidatorHandler(ValidatorConfig config) {
        super(config);
    }


    @Override
    public void apply(FaceletContext ctx, UIComponent parent) throws IOException {
        super.apply(ctx, parent);

        // only process if it's been created
        if (parent.getParent() == null) {
            parent.subscribeToEvent(PreRenderComponentEvent.class,
                                    new PreRenderListener());
        }
    }
    
    
    public static class PreRenderListener implements ComponentSystemEventListener, Serializable {
        private static final long serialVersionUID = 0L;
        public void processEvent(ComponentSystemEvent event)
                throws AbortProcessingException {
            UIComponent c = (UIComponent) event.getSource();
            c.getAttributes().put("onmouseout", "validate('" + c.getClientId(FacesContext.getCurrentInstance()) + "')");
        }
    }

    
}