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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.faces.FacesException;
import javax.faces.component.UIComponent;
import javax.faces.component.UIComponentBase;

import org.ajax4jsf.taglib.ajax.AjaxSupportTag;

import com.sun.facelets.FaceletContext;
import com.sun.facelets.FaceletException;
import com.sun.facelets.tag.TagAttribute;
import com.sun.facelets.tag.TagHandler;
import com.sun.facelets.tag.jsf.ComponentConfig;

/**
 * "proxy" class for creating UIAjaxSupport component as facet for it's parent.
 * @author shura (latest modification by $Author: alexsmirnov $)
 * @version $Revision: 1.5 $ $Date: 2006/07/29 11:49:07 $
 *
 */
public class AjaxSupportHandler extends TagHandler {
    /**
     * A UIComponent for capturing a child UIComponent, representative of the
     * desired Facet
     * 
     * @author Jacob Hookom
     * 
     */
    private final static class UIFacet extends UIComponentBase {
        public String getFamily() {
            return null;
        }
    }

	/**
	 * Real tag handler for create component.
	 */
	private TagHandler _ajaxSupportHandler;
	
	private TagAttribute _event;
	/**
	 * @param config
	 */
	public AjaxSupportHandler(ComponentConfig config) {
		super(config);
		_event = getRequiredAttribute("event");
		_ajaxSupportHandler = new AjaxComponentHandler(config);
	}

	/* (non-Javadoc)
	 * @see com.sun.facelets.FaceletHandler#apply(com.sun.facelets.FaceletContext, javax.faces.component.UIComponent)
	 */
	public void apply(FaceletContext ctx, UIComponent parent)
			throws IOException, FacesException, FaceletException, ELException {
        UIComponent c;
        // our id
//        String id = ctx.generateUniqueId(this.tagId);
        UIFacet facet = new UIFacet();
        // Find facet for support component
        String facetName = AjaxSupportTag.AJAX_SUPPORT_FACET+_event.getValue();
		c = parent.getFacet(facetName);
        if (null != c) {
			parent.getFacets().remove(facetName);
			facet.getChildren().add(c);
		}
        this._ajaxSupportHandler.apply(ctx, facet);
        c = (UIComponent) facet.getChildren().get(0);
        parent.getFacets().put(facetName, c);
        // Fix for possible incompabilites in different frameworks.
//        c.setParentProperties(parent);
	}

}