plugins


WordPress: How to disable a plugin on all pages except for a specific one

A few days ago we were struggling to find a way to limit the amount of plugins that load at any point on a WordPress website. We noticed that several plugins enqueue their scripts and their styles in all requests to the website even if they are actually used on a single page only. This issue was important to address as it was making the whole server slower by giving it extra requests from the client that would never provide any actual benefit to the user.

Initially, we tried to selectively enable those plugins on their respective pages but we did not get it right and things would load out of order and break. Instead of following the ‘enable when needed‘ methodology we decided to follow the ‘disable unless needed‘ methodology which seemed simpler at the time.

Our changes involved in adding the following code in the functions.php file of our child theme.

//Register a filter at the correct event
add_filter( 'option_active_plugins', 'bf_plugin_control' );

function bf_plugin_control($plugins) {
  // If we are in the admin area do not touch anything
  if (is_admin()) {
    return $plugins;
  }
  
  // Check if we are at the expected page, if not remove the plugin from the active plugins list
  if(is_page("csv-to-kml-cell-site-map") === FALSE){ 
    // Finding the plugin in the active plugins list
    $key = array_search( 'csv-kml/index.php' , $plugins );
    if ( false !== $key ) {
      // Removing the plugin and dequeuing its scripts
      unset( $plugins[$key] );
      wp_dequeue_script( 'bf_csv_kml_script' );
    }
  }

  if(is_page("random-password-generator") === FALSE){ 
    $key = array_search( 'bytefreaks-password-generator/passwordGenerator.php' , $plugins );
    if ( false !== $key ) {
      unset( $plugins[$key] );
    }
  }
  
  if(is_page("xml-tree-visualizer") === FALSE){ 
    $key = array_search( 'xmltree/xml-tree.php' , $plugins );
    if ( false !== $key ) {
      unset( $plugins[$key] );
      wp_dequeue_script( 'bf_xml_namespace' );
      wp_dequeue_style( 'bf_xml_namespace' );
    }
  }

  return $plugins;
}

One day, we will clean the above code to make it tidy and reusable.. one day, that day is not today.

What the code above does is the following:

  • Using is_admin it checks if the Dashboard or the administration panel is attempting to be displayed, in that case it does not do any changes.
  • With is_page, it will additionally check if the parameter is for one of the pages specified and thus disable the plugin if the check fails.
  • PHP command array_search, will see if our plugin file is expected to be executed (all files in $plugins are the plugin files that are expected to be executed) .
  • wp_dequeue_script and wp_dequeue_style remove the previously enqueued scripts and styles of the plugin as long as you know the handles (or namespaces of the enqueued items).
    To get the handles (namespaces) we went through the plugin codes and found all instances of wp_enqueue_script and wp_enqueue_style.
    Please note that several small plugins do not have additional items in queue so no further action is needed.

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Install Required Plugins of Gillion | Multi-Concept Blog/Magazine & Shop WordPress Theme

For Gillion (the Multi-Concept Blog/Magazine & Shop WordPress Theme) to properly work, it needs the WPBakery Page Builder (formerly Visual Composer) and the Unison plugins. In a clients’ page, they did not get the message prompting to install the required plugins and could not find it again. Unison is available through WordPress Plugin Directory so that was easy to setup. On the other hand, WPBakery (and the Revolution slider) it is not available through the directory as it is a commercial product. After reading through the support forums we realised that they should not need to make a separate purchase of the plugin, the theme will be able to pull it automatically from a CDN of shufflehound (without getting support from the WPBakery team).

Solution: In case you are facing the same issue, you can find the installation link under the left side menu Appearance where a new option will be available called Install Plugins (the link will be similar to this http://example.com/wp-admin/themes.php?page=tgmpa-install-plugins). We installed for them the two required plugins and their theme was operational.

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