── plugins/content/rating
   ├── language
   │   └── en-GB
   │       ├── en-GB.plg_content_rating.ini      [Языковой файл]
   │       └── en-GB.plg_content_rating.sys.ini  [Языковой файл]
   ├── rating
   │   ├── rating.css  [CSS для отображения таблицы]
   │   └── rating.xml  [Описание формы]
   ├── rating.php   [Плагин с событиями]
   └── rating.xml   [Манифест]

<!--?xml version="1.0" encoding="utf-8"?-->
 <extension version="2.5" type="plugin" group="content" method="upgrade">
  <name>plg_content_rating</name>
  <author>Joomla! Project</author>
  <creationdate>June 2012</creationdate>
  <copyright>(C) 2005 - 2012 Open Source Matters. All rights reserved.</copyright>
  <license>GNU General Public License version 2 or later; see LICENSE.txt</license>
  <authoremail>admin@joomla.org<;/authoremail>
  <authorurl>www.joomla.org</authorurl>
  <version>2.5.0</version>
  <description>PLG_CONTENT_RATING_XML_DESCRIPTION</description>
  
  <files>
   <folder>language</folder>
   <folder>rating</folder>
   <filename plugin="rating">rating.php</filename>
   <filename>index.html</filename>
  </files>
  
  <config>
   <fields name="params">
    <fieldset name="basic">
     <field name="ratingclass_sfx" type="text" label="PLG_CONTENT_RATING_ITEM_FIELD_RATING_CLASS_LABEL" description="PLG_CONTENT_RATING_ITEM_FIELD_RATING_CLASS_DESC"></field>
    </fieldset>
   </fields>
  </config>
 </extension>

PLG_CONTENT_RATING="Content - Rating"
PLG_CONTENT_RATING_XML_DESCRIPTION="[plg_content_rating] Example plugin on how to add custom fields (texture/temperature/taste) to articles (com_content). Adds ratings to an article, and display them as a table before the article content."
PLG_CONTENT_RATING_SLIDER_LABEL="Rating Options"
PLG_CONTENT_RATING_FIELD_TEXTURE_LABEL="Texture"
PLG_CONTENT_RATING_FIELD_TEXTURE_DESC="What does the sample feel like"
PLG_CONTENT_RATING_FIELD_TEMPERATURE_LABEL="Temperature"
PLG_CONTENT_RATING_FIELD_TEMPERATURE_DESC="What is the temperature of the sample"
PLG_CONTENT_RATING_FIELD_TASTE_LABEL="Taste"
PLG_CONTENT_RATING_FIELD_TASTE_DESC="How does the sample taste"
PLG_CONTENT_RATING_ITEM_FIELD_RATING_CLASS_LABEL="Rating Class"

div.rating {
 display: block;
 float: left;
 padding-right: 10px;
}
 
div.rating table tr td {
 margin: 1px !important;
 padding: 2px !important;
}
 
div.rating table tr.row0  {
 background-color:#efefef;
}
 
div.rating table tr.row1 {
 background-color:#fff;
}

 <!--?xml version="1.0" encoding="utf-8"?-->
<form>
 <fields name="rating">
  <fieldset name="rating" label="PLG_CONTENT_RATING_SLIDER_LABEL">
   <field name="texture" type="text" id="texture" description="PLG_CONTENT_RATING_FIELD_TEXTURE_DESC" label="PLG_CONTENT_RATING_FIELD_TEXTURE_LABEL" message="PLG_CONTENT_RATING_FIELD_TEXTURE_MESSAGE" size="30"></field>
   <field name="temperature" type="text" id="temperature" description="PLG_CONTENT_RATING_FIELD_TEMPERATURE_DESC" label="PLG_CONTENT_RATING_FIELD_TEMPERATURE_LABEL" message="PLG_CONTENT_RATING_FIELD_TEMPERATURE_MESSAGE" size="30"></field>
   <field name="taste" type="text" id="taste" description="PLG_CONTENT_RATING_FIELD_TASTE_DESC" label="PLG_CONTENT_RATING_FIELD_TASTE_LABEL" message="PLG_CONTENT_RATING_FIELD_TASTE_MESSAGE" size="30"></field>
  </fieldset>
 </fields>
</form>

public function __construct(& $subject, $config)
{
 parent::__construct($subject, $config);
 $this->loadLanguage();
}

public public function onContentPrepareForm($form, $data)
{
 if (!($form instanceof JForm))
 {
  $this->_subject->setError('JERROR_NOT_A_FORM');
  return false;
 }
  
 // Добавление дополнительных полей к .
 JForm::addFormPath(dirname(__FILE__) . '/rating');
 $form->loadFile('rating', false);
 return true;
}

public function onContentPrepareData($context, $data)
{
 if (is_object($data)){
  $articleId = isset($data->id) ? $data->id : 0;
  if ($articleId > 0){
 
   // Загружает данные из базы данных
   $db = JFactory::getDbo();
   $query = $db->getQuery(true);
   $query->select('profile_key, profile_value');
   $query->from('#__user_profiles');
   $query->where('user_id = ' . $db->Quote($articleId));
   $query->where('profile_key LIKE ' . $db->Quote('rating.%'));
   $query->order('ordering');
   $db->setQuery($query);
   $results = $db->loadRowList();
  
   // Проверка на ошибки в базе данных
   if ($db->getErrorNum()){
    $this->_subject->setError($db->getErrorMsg());
    return false;
   }
  
   // Слияние данных
   $data->rating = array();
  
   foreach ($results as $v)
   {
    $k = str_replace('rating.', '', $v[0]);
    $data->rating[$k] = json_decode($v[1], true);
    if ($data->rating[$k] === null){
     $data->rating[$k] = $v[1];
    }
   }
  }
  else {
 
   // Загрузка формы
   JForm::addFormPath(dirname(__FILE__) . '/rating');
   $form = new JForm('com_content.article');
   $form->loadFile('rating', false);
  
   // Устнаовка значений по умолчанию
   $data->rating = array();
   foreach ($form->getFieldset('rating') as $field) {
    $data->rating[] = array($field->fieldname, $field->value);
   }
  }
 }
 
 return true;
}

public function onContentAfterSave($context, &$article, $isNew)
{
 $articleId = $article->id;
 if ($articleId && isset($article->rating) && (count($article->rating))){
  try
  {
   $db = JFactory::getDbo();
  
   $query = $db->getQuery(true);
   $query->delete('#__user_profiles');
   $query->where('user_id = ' . $db->Quote($articleId));
   $query->where('profile_key LIKE ' . $db->Quote('rating.%'));
   $db->setQuery($query);
   if (!$db->query()) {
    throw new Exception($db->getErrorMsg());
   }
  
   $query->clear();
   $query->insert('#__user_profiles');
   $order = 1;
   foreach ($article->rating as $k => $v)
   {
    $query->values($articleId.', '.$db->quote('rating.'.$k).', '.$db->quote(json_encode($v)).', '.$order++);
   }
   $db->setQuery($query);
  
   if (!$db->query()){
    throw new Exception($db->getErrorMsg());
   }
  }
  catch (JException $e)
  {
   $this->_subject->setError($e->getMessage());
   return false;
  }
 }
  
 return true;
}

public function onContentAfterDelete($context, $article)
{
 $articleId = $article->id;
 if ($articleId){
  try
  {
   $db = JFactory::getDbo();
  
   $query = $db->getQuery(true);
   $query->delete();
   $query->from('#__user_profiles');
   $query->where('user_id = ' . $db->Quote($articleId));
   $query->where('profile_key LIKE ' . $db->Quote('rating.%'));
   $db->setQuery($query);
  
   if (!$db->query()){
    throw new Exception($db->getErrorMsg());
   }
  }
  catch (JException $e)
  {
   $this->_subject->setError($e->getMessage());
   return false;
  }
 }
  
 return true;
}

public function onContentPrepare($context, &$article, &$params, $page = 0)
{
 if (!isset($article->rating) || !count($article->rating))
  return;
  
 // Добавляет CSS для отображения значений
 $doc = JFactory::getDocument();
 $doc->addStyleSheet(JURI::base(true).'/plugins/content/rating/rating/rating.css');
  
 // Создание таблицы результатов на лету
 jimport('joomla.html.grid');
 $table = new JGrid();
  
 // Создание колонок
 $table->addColumn('attr')
       ->addColumn('value');  
  
 // заполняем
 $rownr = 0;
 foreach ($article->rating as $attr => $value) {
  $table->addRow(array('class' => 'row'.($rownr % 2)));
  $table->setRowCell('attr', $attr);
  $table->setRowCell('value', $value);
  $rownr++;
 }
  
 // Оборачиваем таблицу блоком <div> с заданным классом
 $suffix = $this->params->get('ratingclass_sfx', 'rating');
 $html = '<div class=".$suffix.">'.(string)$table.'</div>';
  
 $article->text = $html.$article->text;
}
</div>