DefaultFocusBehaviour.java

/**
 * Copyright (C) 2010 Peter Karich <jetwick_@_pannous_._info>
 *
 * Licensed 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.
 */

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package de.jetwick.ui.util;

import org.apache.wicket.Component;
import org.apache.wicket.behavior.AbstractBehavior;
import org.apache.wicket.markup.html.IHeaderResponse;
import org.apache.wicket.markup.html.form.FormComponent;

/**
 * http://stackoverflow.com/questions/2632684/set-focus-on-a-component-with-apache-wicket
 */
public class DefaultFocusBehaviour extends AbstractBehavior {

    private static final long serialVersionUID = -4891399118136854774L;
    private Component component;

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

    @Override
    public void renderHead(IHeaderResponse iHeaderResponse) {
        super.renderHead(iHeaderResponse);
        iHeaderResponse.renderOnLoadJavascript("document.getElementById('"
                + component.getMarkupId() + "').focus();");
    }
}