Create page without header and footer in Drupal 7

    This blog describes about create only page contents without header and footer in Drupal 7. All of you know almost all of the pages in Drupal have header and footer. Suppose you want to create a page without header and footer in Drupal 7. Is it possible? Yes, it is possible in Drupal 7. You can create a page without header and footer using 'delivery callback' in hook_menu.

Render a page without header and footer in Drupal 7:

     Drupal provide a option to create page without header and footer. Let see the below code for render a page without header and footer in Drupal 7.

/**
 * Implement hook_menu().
 */
function phponwebsites_menu() {
  $items['sample-wo-header-footer'] = array(
    'title' => 'A page without header and footer in Drupal 7',
    'access callback' => TRUE,
    'page callback' => 'phponwebsites_without_header_footer',
    'type' => MENU_CALLBACK,
    'delivery callback' => 'deliver_plain',
  );
  return $items;
}

function deliver_plain($page_callback_result) {
  print $page_callback_result;
}

/**
 * Implement phponwebsites_without_header_footer().
 */
function phponwebsites_without_header_footer() {
  return 'This is the page without header and footer';
}

   You could see the page without any header and footer when you view page in a browser. Now I've hope you how to render a page without header and footer in Drupal 7.

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Clear views cache when insert, update and delete a node in Drupal 7

This blog describes how to clear views cache while inserting, updating and deleting a node in Drupal 7. If we want to improve site performance, then views caching is one of the options.

   For example, you have views which display list of records. It will update occasionally. Then we can render views data from cache rather than server if we set cache for views. We can set views cache at its settings page. Suppose you have cached views for 5 mins. Then it didn't display updated data until 5 mins even if new node is added to that views. It displays updated data only after 5 mins because the views is cached for 5 mins. In that situation, the user can't view new data in cached views. So we need to clear views cache when add , update and delete a node. So only we can see new data in views and also data is rendered from cache.

Clear views cache when insert a new node in Drupal 7:

   The newly added node has not been displayed in views list if the cache is applied to a views. So we need to clear views cache when insert a new node using hook_node_insert(). Lets see the code for clear views cache while inserting a node:

 <?php
 /**
  * Imeplement hook_node_insert().
  */
 function phponwebsites_node_insert($node) {
   if ($node->type == 'tasks') {
     //clear views cache
     $viewsname = 'activity';
     cache_clear_all($viewsname, 'cache_views_data', TRUE);
   }
 }

Clear views cache when update a node in Drupal 7:

   When you tried to update a node, the updated data in that node has not been displayed in views. So we need to clear views cache when update a node using hook_node_update(). Lets see the code for clear views cache while updating a node:

 <?php
 /**
  * Imeplement hook_node_update().
  */
 function phponwebsites_node_update($node) {
   if ($node->type == 'article') {
     //clear views cache
     $viewsname = 'articles';
     cache_clear_all($viewsname, 'cache_views_data', TRUE);
   }
 }

Clear views cache when delete a node in Drupal 7:

   After delete a node, you could see the deleted node is displayed in the views. So we need to clear views when delete a node using hook_node_delete(). Lets see the code for clear views cache while deleting a node:

 <?php
 /**
  * Imeplement hook_node_delete().
  */
 function phponwebsites_node_delete($node) {
   if ($node->type == 'article') {
     //clear views cache
     $viewsname = 'articles';
     cache_clear_all($viewsname, 'cache_views_data', TRUE);
   }
 }

   You can see the performance of views page will be increased and you can see changes in your views. Now I've hope you know how to clear views cache when insert, update and delete a node in Drupal 7.

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