Alex Objelean

public class JGrowlBehavior extends AbstractDefaultAjaxBehavior {
  /**
   * serialVersionUID
   */
  private static final long serialVersionUID = 1L;
    /** reference to the default indicator gif file. */
    public static final ResourceReference JGROWL_JS = new ResourceReference(
        MyApplication.class, "ref/jgrowl.js");
  /**
   * Model containing a list of feedback messages.
   */
  private FeedbackMessagesModel feedbackModel;

  /**
   * {@inheritDoc}
   */
  @Override
  public void beforeRender(final Component component) {
    super.beforeRender(component);
    feedbackModel = new FeedbackMessagesModel(component);
  }

  /**
   * @param message
   */
  private String buildNotice(final FeedbackMessage message) {
    final StringBuffer sb = new StringBuffer("jQuery.noticeAdd(");
    final Map<String, Object> map = new HashMap<String, Object>();
    map.put("text", JavascriptUtils.escapeQuotes(message.getMessage()
        .toString()));
    if (message.getLevel() == FeedbackMessage.INFO) {
      map.put("type", "info");
      map.put("stay", Boolean.TRUE);
    } else if (message.getLevel() == FeedbackMessage.ERROR) {
      map.put("type", "error");
      map.put("stay", Boolean.FALSE);
    }
    sb.append(MyUtils.mapToJSON(map));
    sb.append(");");
    return sb.toString();
  }

  /**
   * @return feedback messages. This method is safe to call even if the model
   *         was not initialized.
   */
  private List<FeedbackMessage> getFeedbackMessages() {
    return feedbackModel == null ? null : feedbackModel.getObject();
  }

  /**
   * {@inheritDoc}
   */
  private String getJavascript() {
    final StringBuffer js = new StringBuffer();
    final List<FeedbackMessage> messages = getFeedbackMessages();
    if (messages != null) {
      for (final FeedbackMessage message : feedbackModel.getObject()) {
        buildNotice(message);
        js.append(buildNotice(message));
      }
    }
    return js.toString();
  }

  /**
   * {@inheritDoc}
   */
  @Override
  public void renderHead(final IHeaderResponse response) {
    super.renderHead(response);
    response.renderJavascriptReference(JGROWL_JS);
    response.renderOnDomReadyJavascript(getJavascript());
  }

  /**
   * {@inheritDoc}
   */
  @Override
  protected void respond(final AjaxRequestTarget target) {
    target.appendJavascript(getJavascript());
  }
}