Control modules based on article category

With JomGenius

Category detection:

// This rule will trigger on category pages (blog or list style) as well as article
pages, where the category id of the category or article matches the one shown
if ( $content_genius->("category_id = 15") ) return VVV;
if ( $content_genius->("category_id = 17") ) return WWW;
if ( $content_genius->("category_id = 18,19,20") ) return XXX; // combine several categories for one module id

// exclude category or categories
if ( $content_genius->("category_id not = all of 15,16,17") ) return UUU;
if ( $content_genius->("category_id not = 18") ) return UUU;

// show certain modules only on article pages where the article is in a certain category
if ( $content_genius->("pagetype = article") and $content_genius->("category_id = 15") ) return UUU;

// show certain modules only on category blog pages where the article is in a certain category
if ( $content_genius->("pagetype = categoryblog") and $content_genius->("category_id = 15") ) return UUU;

// show certain modules only on category list pages where the article is in a certain category
if ( $content_genius->("pagetype = categorylist") and $content_genius->("category_id = 15") ) return UUU;

Section Detection:

// This rule will trigger on section pages (blog or list style) as well as category pages and article
pages, where the section id of the section, category or article matches the one shown
if ( $content_genius->("section_id = 15") ) return VVV;
if ( $content_genius->("section_id = 17") ) return WWW;
if ( $content_genius->("section_id = 18,19,20") ) return XXX; // combine several sections for one module id

// exclude section or sections
if ( $content_genius->("section_id not = all of 15,16,17") ) return UUU;
if ( $content_genius->("section_id not = 18") ) return UUU;

// show certain modules only on article pages where the article is in a certain section
if ( $content_genius->("pagetype = article") and $content_genius->("section_id = 15") ) return UUU;

// show certain modules only on category blog pages where the article is in a certain section
if ( $content_genius->("pagetype = categoryblog") and $content_genius->("section_id = 15") ) return UUU;

// show certain modules only on category list pages where the article is in a certain section
if ( $content_genius->("pagetype = categorylist") and $content_genius->("section_id = 15") ) return UUU;

// show certain modules only on section blog pages where the article is in a certain section
if ( $content_genius->("pagetype = sectionblog") and $content_genius->("section_id = 15") ) return UUU;

// show certain modules only on section list pages where the article is in a certain section
if ( $content_genius->("pagetype = sectionlist") and $content_genius->("section_id = 15") ) return UUU;

Pre-JomGenius

Category detection:

$category_id = null;
if ( $option == "com_content" ) {
  if ( $view == "category" ) {
   /* category list pages (blog or list style) */
   $category_id = (int)$id;
  } else if (array_key_exists("catid",$_REQUEST)) {
   /* if the category id is in the URL */
   $category_id = (int)JRequest::getInt("catid",0);
  }
  if ( $category_id === null && $view == "article" ) {
   /* if it's an article page without the catid mentioned in the url */
   $nullDate = $db->Quote( $db->getNullDate() );
   $my_id = $db->Quote( $db->getEscaped( (int)$id ) );
   $jnow  =& JFactory::getDate();
   $now    = $db->Quote( $db->getEscaped( $jnow->toMySQL() ) );
   $query = "SELECT  title,  id,  catid "
       . " FROM #__content WHERE id = $my_id AND state = 1"
       . " AND ( publish_up = $nullDate "
       . " OR publish_up <= $now )"
       . " AND ( publish_down = $nullDate "
       . " OR publish_down >= $now  )";
   $db->setQuery( $query, 0, 1 );
   $row = $db->loadObject();
   $category_id = $row->catid;
  }
}
/* Now customise any of the following rules for your use.
 * $category_id will correspond to the category id of the
 * article being displayed (if one is being displayed!)
 */
if ($category_id == 1) return 55;/* on category 1, return module 55 */
if ($category_id == 2) return 56;/* on category 2, return module 56 */
if ($category_id == 3) return 57;/* on category 3, return module 57 */
return 50; /* default if nothing else matches */

Section Detection: (updated 6 October 2009 due to bugs in previous version)

if ( $option == 'com_content' && $view != 'frontpage' ) {
  $section_id = null;
  if ( $view == 'section' ) {
   /* section list pages (blog or list style) */
   $section_id = (int)$id;
  } else if (array_key_exists('sectionid',$_REQUEST)) {
   /* if the section id is in the URL */
   $section_id = (int)JRequest::getInt('sectionid',0);
  }
  if ( $view == 'category' ) {
   /* if it's a category list or blog page, get the section that the
    * category is in
    */
   $my_id = $db->Quote( $db->getEscaped( (int)$id ) );
   $query = "SELECT section from #__categories where id = $my_id";
   $db->setQuery( $query, 0, 1 );
   $row = $db->loadObject();
   $section_id = (int)( $row->section );
  }
  if ( $section_id === null && $view == 'article' ) {
   /* if it's an article page without the sectionid mentioned in the
    * url, look up the section id for that article
    */
   $nullDate = $db->Quote($db->getNullDate());
   $my_id = $db->Quote( $db->getEscaped( (int)$id ) );
   $jnow  =& JFactory::getDate();
   $now   = $db->Quote( $db->getEscaped( $jnow->toMySQL() ) );
   $query = "SELECT  title,  id,  sectionid "
       . " FROM #__content WHERE id = $my_id AND state = 1"
       . " AND ( publish_up = $nullDate "
       . " OR publish_up <= $now )"
       . " AND ( publish_down = $nullDate "
       . " OR publish_down >= $now  )";
   $db->setQuery( $query, 0, 1 );
   $row = $db->loadObject();
   $section_id = $row->sectionid;
  }
 
  /* Now customise any of the following rules for your use.
   * $section_id will correspond to the section id of the
   * article being displayed (if one is being displayed!)
   */
  if ($section_id == 0) return 54;/* uncategorised, return module 54 */
  if ($section_id == 1) return 55;/* on section 1, return module 55 */
  if ($section_id == 2) return 56;/* on section 2, return module 56 */
  if ($section_id == 3) return 57;/* on section 3, return module 57 */
}
return 50; /* default if nothing else matches */