Additional Classes on body level.

As listed here: https://www.joomdev.com/forum/astroid-framework/3336-retrieve-item-id-from-the-menu#15730
1. Corrected spelling for Itemid, I is uppercase.
2. Add menu item alias in the class, this is what you add as the menu class suffix anyway.
3. Adding template style ID, in case you are running multiple styles of Astroid and want styling for each one of them.

These corrections would not have been possible without idea's received from Jonathan Magoga (@jonrz) and Serge Billon (web54.fr).

Author: chetanmadaan

astroid/astroid-framework/framework/template.php

@@ -644,11 +644,14 @@ public function loadTemplateJS($components = '') {
       $this->setLog("Javascripts Loaded!", "success");
    }
 
+	/*
+	*	Function to return classes imploded in the body tag on the website.
+	*/
    public function bodyClass($body_class, $language = '', $direction = '') {
+	  $template = JFactory::getApplication()->getTemplate(true);
       $class = [];
       $app = JFactory::getApplication();
       $menu = $app->getMenu()->getActive();
-
       $class[] = "site";
       $class[] = "astroid-framework";
 
@@ -658,7 +661,7 @@ public function bodyClass($body_class, $language = '', $direction = '') {
       $task = $app->input->get('task', '', 'STRING');
       $header = $this->params->get('header', TRUE);
       $headerMode = $this->params->get('header_mode', 'horizontal', 'STRING');
-      $itemid = $app->input->get('itemid', '', 'INT');
+      $Itemid = $app->input->get('Itemid', '', 'INT');
 
       if (!empty($option)) {
          $class[] = htmlspecialchars(str_replace('_', '-', $option));
@@ -672,8 +675,8 @@ public function bodyClass($body_class, $language = '', $direction = '') {
       if (!empty($task)) {
          $class[] = 'task-' . $task;
       }
-      if (!empty($itemid)) {
-         $class[] = 'itemid-' . $itemid;
+      if (!empty($Itemid)) {
+         $class[] = 'itemid-' . $Itemid;
       }
 
       if ($header && !empty($headerMode) && $headerMode == 'sidebar') {
@@ -682,11 +685,16 @@ public function bodyClass($body_class, $language = '', $direction = '') {
       }
 
       if (isset($menu) && $menu) {
-         if ($menu->params->get('pageclass_sfx')) {
+         if ($menu->get('pageclass_sfx')) {
             $class[] = $menu->params->get('pageclass_sfx');
+         }
+		 if ($menu->get('alias')) {
+            $class[] = $menu->get('alias');
          }
       }
-
+	  if (!empty($template->id)) {
+         $class[] = 'tp-style-' . $template->id;
+      }
       if (!empty($language)) {
          $class[] = $language;
       }