Sorting items and posting extra variable to PHP

Sorting items and posting extra variable to PHP

  1. jQuery(document).ready(function(){   
       
        jQuery('.sort').sortable({
        cursor:     'move',
        axis:       'y',
        update: function(e, ui) {
            href = ajaxpath2;
            jQuery(this).sortable("refresh");
            sorted = jQuery(this).sortable("serialize", 'id');
           
            jQuery.ajax({
                    type:   'POST',
                    url:    href,
                    data:   sorted,
           
                    success: function(msg) {
                            //do something with the sorted data
                            alert("Your itemshave been re-ordered");
                           
                    }
            });
        }
    });
The code sorts the items and it updates the database using the id. But I want to send an additional variable of the category ID in the post I can use in my PHP.  Here is the HTML where I can drag and reorder. The variable i want to sent is $pr['cat_id'].'

  1. <tr class="row' . ($i++ % 2). '" id= pid_'. $pr['prod_id'].' >';