ValidationMsgBehavior.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.forms;

import org.apache.wicket.Component;
import org.apache.wicket.behavior.AbstractBehavior;
import org.apache.wicket.markup.html.form.FormComponent;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * @author Ingo Renner
 * @author Henning Teek
 */
public class ValidationMsgBehavior extends AbstractBehavior {
    private final Logger log = LoggerFactory.getLogger(ValidationMsgBehavior.class);

    public void onRendered(Component c) {
        if (FormComponent.class.isAssignableFrom(c.getClass())) {
            log.info("onComponentTag: c = " + c + ", c.getClass() = " + c.getClass());
            assert (c instanceof FormComponent<?>);
            FormComponent<?> fc = (FormComponent<?>) c;
            if (!fc.isValid()) {
                String error;
                if (fc.hasFeedbackMessage()) {
                    error = fc.getFeedbackMessage().getMessage().toString();
                    fc.getFeedbackMessage().markRendered();
                } else {
                    error = "Your input is invalid.";
                }
                fc.getResponse().write("<div class=\"validationMsg\">" + error + "</div>");
            }
        }
    }
}