DefaultFocusBehavior.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * 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 ro.nextreports.server.web.common.behavior;

import org.apache.wicket.Component;
import org.apache.wicket.behavior.Behavior;
import org.apache.wicket.markup.head.IHeaderResponse;
import org.apache.wicket.markup.head.OnLoadHeaderItem;
import org.apache.wicket.markup.html.form.FormComponent;

/**
 * @author Decebal Suiu
 * @see http://apache-wicket.1842946.n4.nabble.com/Default-Focus-Behavior-td1868610.html
 */
public class DefaultFocusBehavior extends Behavior {

	private static final long serialVersionUID = 1L;

	@Override
	public void bind(Component component) {
		if (!(component instanceof FormComponent)) {
			throw new IllegalArgumentException("DefaultFocusBehavior: component must be instanceof FormComponent");
		}
		component.setOutputMarkupId(true);
	}

	@Override
	public void renderHead(Component component, IHeaderResponse response) {
		super.renderHead(component, response);
		
		response.render(OnLoadHeaderItem.forScript("document.getElementById('" + component.getMarkupId() + "').focus();"));
	}

}