Ajax URL not saving

Hi,

I have a submenu admin section under my custom post type which lists the posts. I have applied jQuery sortable and it all works fine except for the actual saving to the postmeta in the database.

<?php
/*
Plugin Name: Order
Description: Posts Order using a Drag and Drop Sortable javascript capability
*/

define('SORTPATH',   plugin_dir_path(__FILE__));
define('SORTURL',    plugins_url('', __FILE__));

add_action( 'admin_init','registerFiles');
function registerFiles()
            {

                        wp_enqueue_script('jQuery');
                        wp_enqueue_script('jquery-ui-sortable');

                wp_register_style('CPTStyleSheets', SORTURL . '/css/cpt.css');
                wp_enqueue_style( 'CPTStyleSheets');
	        }

add_action( 'wp_ajax_update-custom-type-order','saveAjaxOrder');
function saveAjaxOrder()
            {
		        global $wpdb;

		        parse_str($_POST['order'], $data);

		        if (is_array($data))
                foreach($data as $key => $values )
                    {

				                foreach( $values as $position => $id )
                                    {
					                    $data = array('menu_order' => $position, 'post_parent' => 0);
                                        $data = apply_filters('post-types-order_save-ajax-order', $data, $key, $id);

                                        update_post_meta($id, 'asset-order', $position);
				                    } 

		            }
	        }

add_action( 'admin_menu','addMenu');
	    function addMenu()
        {

	add_submenu_page(
		'edit.php?post_type=staff',
		'Order',
		'Order',
		'edit_pages', 'staff-order',
		'SortPage'
	);
}
function AssetPage()
{
       wp_reset_query();
    query_posts(array(
        'post_type' => 'staff',
        'categories' => 'asset-advisory-services',
        'orderby' => 'menu_order',
        'order' => ASC
    ) );  

echo '<ul class="sortable">';
if ( have_posts() ) : while ( have_posts() ) : the_post(); 

    echo '<li>';
    echo '<i class="flaticon-move7"></i>';
    the_title();
    echo '</li>';

endwhile; else:
endif;
echo '</ul>';
}
function SortPage()
            {
		        ?>
		        <div class="wrap">
                    <h2><?php echo __('Staff Order', 'cpt') ?></h2>

			        <div id="ajax-response"></div>

			        <noscript>
				        <div class="error message">
					        <p><?php _e('This plugin can\'t work without javascript, because it\'s use drag and drop and AJAX.', 'cpt') ?></p>
				        </div>
			        </noscript>

			        <div id="asset" style="background:white;">
				        <h4>Asset Page</h4>
			                 <?php AssetPage(); ?>

				        <div class="clear"></div>
                        <button id="save-order">Save</button>
			        </div>

			        <script type="text/javascript">
				        jQuery(document).ready(function() {
					        jQuery(".sortable").sortable({
						        'tolerance':'intersect',
						        'cursor':'move',
						        'items':'li',
						        'placeholder':'placeholder',
						        'nested': 'ul'
					        });

					        jQuery(".sortable").disableSelection();
					        jQuery("#save-order").bind( "click", function() {
						        jQuery.post( ajaxurl, { action:'update-custom-type-order', order:jQuery(".sortable").sortable("serialize") }, function() {
							        jQuery("#ajax-response").html('<div class="message updated fade"><p><?php _e('Items Order Updated', 'cpt') ?></p></div>');
							        jQuery("#ajax-response div").delay(3000).hide("slow");
						        });
					        });
				        });
			        </script>

		        </div>
		        <?php
	        }

?>

I have no idea where I’m going wrong here.