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...

new AjaxLink("link") {
  protected onClick(AjaxRequestTarget target) { ...}

  @Override
  protected IAjaxCallDecorator getAjaxCallDecorator() {
    return new AjaxCallDecorator() {
      @Override
      public CharSequence decorateScript(Component c, CharSequence script) {
        return super.decorateScript(c, "alert('This is my javascript call'); " + script);
      }
    };
  }
}

...