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Ajax4jsf is an open source extension to the JavaServer Faces standard that adds AJAX capability to JSF applications without requiring the writing of any JavaScript.

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/**
 * Licensed under the Common Development and Distribution License,
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *   http://www.sun.com/cddl/
 *   
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or 
 * implied. See the License for the specific language governing
 * permissions and limitations under the License.
 */

package org.ajax4jsf.tag;

import java.io.IOException;

import javax.el.ELException;
import javax.el.VariableMapper;
import javax.faces.FacesException;
import javax.faces.component.UIComponent;

import org.ajax4jsf.ajax.UIInclude;

import com.sun.facelets.FaceletContext;
import com.sun.facelets.el.VariableMapperWrapper;
import com.sun.facelets.tag.TagAttribute;
import com.sun.facelets.tag.jsf.ComponentConfig;
import com.sun.facelets.tag.jsf.ComponentHandler;

/**
 * @author shura
 *
 */
public class IncludeHandler extends ComponentHandler {
	
	private TagAttribute viewId;

	public IncludeHandler(ComponentConfig config) {
		super(config);
		this.viewId = getRequiredAttribute("viewId");
	}

	/* (non-Javadoc)
	 * @see com.sun.facelets.tag.jsf.ComponentHandler#onComponentCreated(com.sun.facelets.FaceletContext, javax.faces.component.UIComponent, javax.faces.component.UIComponent)
	 */
	protected void onComponentCreated(FaceletContext ctx, UIComponent c, UIComponent parent) {
		// TODO Auto-generated method stub
		super.onComponentCreated(ctx, c, parent);
	}
	
    protected void applyNextHandler(FaceletContext ctx, UIComponent c) 
    throws IOException, FacesException, ELException {
    	String path;
    	if(c.isRendered()){
    	if (c instanceof UIInclude) {
			UIInclude include = (UIInclude) c;
			path = include.getViewId();
//			if(include.isWasNavigation()){
//				c.getChildren().clear();
//			}
		} else {
			path = (String) c.getAttributes().get("viewId");
		}
        VariableMapper orig = ctx.getVariableMapper();
        ctx.setVariableMapper(new VariableMapperWrapper(orig));
        try {
            this.nextHandler.apply(ctx, c);
            ctx.includeFacelet(c, path);
        } finally {
            ctx.setVariableMapper(orig);
        }
    	} else {
    		c.getChildren().clear();
            this.nextHandler.apply(ctx, null);			
		}
    }

}