pie_cart_ajax.module [working]

<?php
/**
 * @file
 * Drupal Commerce Cart Ajax module.
 * Ajax features for Drupal Commerce Cart. Quick item removal and quantity changes.
 */

/**
 * Implements hook_form_FORM_ID_alter().
 * Alter to cart form to add #ajax properties.
 */
function pie_cart_ajax_form_views_form_alter(&$form, $form_state, $form_id) {
  $alter = strpos($form_id, 'views_form_commerce_cart_form_') === 0;
  if ($alter) {
    _pie_cart_ajax_form_views_form_alter($form, $form_state, $form_id);
  }
}

function _pie_cart_ajax_form_views_form_alter(&$form, $form_state, $form_id) {
  unset($form['#action']);
  $submit = $form['#submit'];
  unset($form['#submit']);

  $ajax = array (
    'callback' => 'pie_cart_ajax_update_cart_callback',
    'progress' => array(),
    'effect' => 'fade',
  );

  // Update Cart Button
  $form['actions']['submit']['#ajax'] = $ajax;
  $form['actions']['submit']['#submit'][] = 'pie_cart_ajax_update_cart_submit';

  // Checkout Button
  $form['actions']['checkout']['#type'] = 'button';
  $form['actions']['checkout']['#ajax'] = array(
    'callback' => 'pie_cart_ajax_checkout_redirect_callback',
    'progress' => array(),
  );

  if ($form_state['submitted']) {
    if (!empty($form['edit_quantity'])) {
      foreach (element_children($form['edit_quantity']) as $j) {
        $line_item_id = $form['edit_quantity'][$j]['#line_item_id'];
        $form['edit_quantity'][$j]['#default_value'] = round($form_state['line_items'][$line_item_id]->quantity);
      }
    }
  }
  // Delete Buttons
  if (!empty($form['edit_delete'])) {
    foreach (element_children($form['edit_delete']) as $k) {
      $form['edit_delete'][$k]['#value'] = t('X');
      $form['edit_delete'][$k]['#ajax'] = $ajax;
      $form['edit_delete'][$k]['#submit'][] = 'pie_cart_ajax_update_cart_submit';
    }
  }
  dpm($form);
  return;
}

function pie_cart_ajax_checkout_redirect_callback() {
  ctools_include('ajax');
  ctools_add_js('ajax-responder');
  $commands[] = ctools_ajax_command_redirect('checkout');
  print ajax_render($commands);
  exit;
}

function pie_cart_ajax_update_cart_submit($form, &$form_state) {
  $form_state['storage'] = array(
    'trigger' => $form_state['triggering_element'],
    'start_quantity' => $form_state['complete form']['edit_quantity'],
    'end_quantity' => $form_state['values']['edit_quantity'],
    'view' => $form_state['build_info']['args']['0']->result,  // OPTIONAL: only needed for callback additional process
  );
  $form_state['rebuild'] = TRUE;
}

function pie_cart_ajax_update_cart_callback($form, $form_state) {
  global $user;
  $cart = pie_cart_ajax_cart_reload(); //Retrieve the new cart view

  $errors = drupal_get_messages('status', TRUE); // Clear cart related messages

  $commands = array();

  //additional processing code not related to ajaxifying the cart goes here

  $commands[] = ajax_command_replace('.view-commerce-cart-form', $cart);
  //$commands[] = ajax_command_append('.view-commerce-cart-form', $errors);
  return array('#type' => 'ajax', '#commands' => $commands);
}

function pie_cart_ajax_cart_reload() {
  global $user;
  $view_name = 'commerce_cart_form';
  $cart_order = commerce_cart_order_load($user->uid);

  if (!$cart_order || empty($cart_order->commerce_line_items)) {
    $cart = '<div class="view-commerce-cart-form">' . theme('commerce_cart_empty_block') . '</div>';
  }
  else {
    $args = array($cart_order->order_number);
    $display_id = 'default'; // The display id of for the view.
    $view = views_get_view($view_name);

    if (!$view || !$view->access($display_id)) {
      return;
    }

    $view->set_display($display_id);
    $view->set_arguments($args);
    $cart = $view->preview();
  }
  return $cart;
}