KeepAliveBehavior.java

/**
 * Copyright 2011 the original author or authors.
 *
 * 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.
 */
package org.bricket.web.common;

import org.apache.wicket.ajax.AbstractDefaultAjaxBehavior;
import org.apache.wicket.ajax.AjaxRequestTarget;
import org.apache.wicket.markup.html.IHeaderResponse;

/**
 * @author Ingo Renner
 * @author Henning Teek
 */
public class KeepAliveBehavior extends AbstractDefaultAjaxBehavior {

    @Override
    protected void respond(AjaxRequestTarget target) {
        // prevent wicket changing focus
        target.focusComponent(null);
    }

    @Override
    public void renderHead(IHeaderResponse response) {
        super.renderHead(response);
        response.renderOnLoadJavascript("setInterval(function() { " + "  wicketAjaxGet('" + getCallbackUrl(true)
                + "', null, null, null); " + "}, 600000);");
    }
}