Hi guys i want share parts of the code from my software, and request help for finished a some part
The software is used for control sales and quotations of a my company

This module use a two tables no relationated but connected between
CREATE TABLE `e_order` ( `ide_order` int(11) NOT NULL, `ide_customer` int(11) NOT NULL, `date` datetime NOT NULL, `ide_way_payment` int(1) NOT NULL DEFAULT '1', `status` int(11) NOT NULL DEFAULT '0', `ide_company` int(11) NOT NULL, `ide_type_payment` int(11) NOT NULL DEFAULT '1' ) ENGINE=InnoDB DEFAULT CHARSET=latin1;
CREATE TABLE `e_product` ( `ide_product` int(11) NOT NULL, `code` varchar(45) NOT NULL, `name` varchar(45) NOT NULL, `qty` int(11) NOT NULL DEFAULT '0', `price` int(11) NOT NULL, `total` int(11) NOT NULL, `ide_order` int(11) NOT NULL ) ENGINE=InnoDB DEFAULT CHARSET=latin1;
If i want add items on the order i used a callback

Controller
    public function genera_orden($value = '', $primary_key = null){
        $date = date("Y-m-d H:i:s");
        $customer   = new SoapClient("http://www.appoctava.cl/ws/WebService.php?wsdl", $this->data['conexion']);
        foreach($this->token_model->validar_token() as $row)
        {
            $array  = array("TOKEN" => $row->token); 
            try{ 
                $result         = $customer->__SoapCall("validartokenext", $array); 
                $result_code    = $result[0]->DescripcionResultado; 
                if($result_code == 'TVAL'){
                    $crud = new grocery_CRUD();
                    $crud->set_theme('bootstrap-v4');
                    $crud->set_table('e_order');
                    $crud->where('e_order.ide_company',$this->session->userdata['logged_in']['ide_company']);
                    $crud->set_subject('Orden de compras');
                    $crud->callback_add_field('product', array($this, '_callback_list_product'));
                    $crud->callback_edit_field('product', array($this, '_callback_list_product'));
                    $crud->callback_read_field('product', array($this,'_callback_list_product'));
                    $crud->unset_columns(array('product','ide_company'));
                    
                    $crud->field_type('date', 'hidden', $date);
                    $crud->field_type('ide_company', 'hidden', $this->session->userdata['logged_in']['ide_company']);
                    $crud->callback_after_insert(array($this, '_callback_save_product'));
                    $crud->callback_after_delete(array($this,'_callback_delete_product'));
                    $crud->callback_before_update(array($this, '_callback_save_product'));
                    $crud->add_action('Emitir Factura', '', 'appservice/agrega_dte','ui-icon-plus');
                    $crud->display_as('ide_order','N° Orden de compra');
                    $crud->display_as('ide_customer','Receptor');
                    $crud->display_as('product','Producto(s)');
                    $crud->display_as('date','Fecha');
                    $crud->display_as('status','Estado');
                    $crud->display_as('bname','Nombre');
                    $crud->display_as('ide_way_payment','Forma de pago');
                    $crud->display_as('ide_type_payment','Plazo de pago');
                    
                    $crud->callback_column('status',array($this,'_callback_status_order'));
                    $crud->callback_field('bname',array($this,'_callback_bname'));
                    $crud->callback_column('date',array($this,'_callback_date_format'));
                    
                    $crud->fields('ide_customer','date','bname','product','ide_type_payment','ide_company');
                    $crud->set_relation('ide_customer','e_customer','bname');
                    $crud->set_relation('ide_way_payment','e_way_payment','name');
                    $crud->set_relation('ide_type_payment','e_type_payment','name');
                    
                    $crud->columns('ide_order','ide_customer','date','ide_way_payment','ide_type_payment','status');
                    $crud->add_fields('ide_customer','date','product','ide_way_payment','ide_type_payment','ide_company');
                    $crud->edit_fields('date','product','ide_way_payment','ide_type_payment','ide_company');
                    $output = $crud->render();
                    $this->_appservice_output($output);
                }else{
                    $this->obtener_token();
                    redirect(base_url('user/login'), 'refresh');
                }
            }catch(SoapFault $e){ 
                echo "Ups!! hubo un problema y no pudimos recuperar los datos.<br/>$e<hr/>"; 
            } 
        }
    }
Callback return the HTML
    public function _callback_list_product($value = '', $primary_key = null){
        $this->db->where('ide_order', $primary_key);
        $products = $this->db->get('e_product')->result_array();
        $products[30] = array();
        $html = '
            <table id="product_list"> 
                <tr>
                    <th>Codigo</th><th>Nombre</th><th>Cantidad</th><th>Precio ($CLP)</th>
                </tr>';
                foreach($products as $product)
                {
                    if(!empty($product['code']))
                    {
                    $html.= '<tr>'. 
                        //'<td><input id="product_code[]" name="product_code[]" type="text" value="'.$product["code"].'" style="width: 100px;" class="form-control"></td>'.
                        '<td><input id="product_code[]" name="product_code[]" type="text" value="'.$product["code"].'" style="width: 100px;" class="search form-control"></td>'.
                        '<td><input id="product_name[]" name="product_name[]" type="text" value="'.$product["name"].'" class="form-control"></td>'. 
                        '<td><input id="product_qty[]" name="product_qty[]" type="text" value="'.$product["qty"].'" style="width: 100px;" class="form-control"></td>'. 
                        '<td><input id="product_price[]" name="product_price[]" type="text" value="'.$product["price"].'" style="width: 100px;" class="form-control"></td>'. 
                        
                        '<td><button class="remove_number btn btn-danger"><i class="el el-remove-circle"></i> Eliminar</button></td></tr>';
                    }
                    else
                    {
                    $html .='<tr>'.
                        //'<td><input id="product_code[]" name="product_code[]" type="text" style="width: 100px;" class="form-control"></td>'.
                        '<td><input id="product_code[]" name="product_code[]" type="text" style="width: 100px;" class="search form-control"></td>'.
                        '<td><input id="product_name[]" name="product_name[]" type="text" class="form-control"></td>'.
                        '<td><input id="product_qty[]" name="product_qty[]" type="text" style="width: 100px;" class="form-control"></td>'.
                        '<td><input id="product_price[]" name="product_price[]" type="text" style="width: 100px;" class="form-control"></td>'.
                            
                        '<td><button id="remove_number" class="remove_number btn btn-danger"><i class="el el-remove-circle"></i> Eliminar</button></td></tr></table>'.
                        '<button type="button" id="add_number" style="margin-top: 5px;" class="btn btn-secondary btn-success b10"><i class="el el-circle-arrow-right"></i> Agregar</button>';
                    }
                }
        return $html;
    }
Check the input line was declared on array for add multi items
Now i put the Callback for save the items
    public function _callback_save_product($post_array, $primary_key){
        $this->db->delete('e_product', array('ide_order' => $primary_key));
        $i = 0;
        $data = array();
        while(!empty($post_array["product_code"][$i]) ){
            $product = array(
                'code'      => $post_array["product_code"][$i],
                'name'      => $post_array["product_name"][$i],
                'qty'       => $post_array["product_qty"][$i],
                'price'     => $post_array["product_price"][$i],
                'total'     => ($post_array["product_qty"][$i]*$post_array["product_price"][$i]),
                'ide_order' => $primary_key
            );
            array_push($data, $product);
            $i++;
        }
        $this->db->insert_batch('e_product', $data);
    }
This method works fine... but i need multiple items not only one.. for fix this request i used jquery !!
First i add the Jquery and the libs on my view... (_appservice_output);
View
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.3/umd/popper.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.1.3/js/bootstrap.min.js"></script>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css">
<script>
        jQuery(document).ready(function(){
            jQuery('#add_number').on('click', function(e){
                e.preventDefault();
                //var row = '<tr><td><input id="product_code[]" name="product_code[]" type="text" style="width: 100px;" class="form-control"></td><td><input id="product_name[]" name="product_name[]" type="text" class="form-control"></td><td><input id="product_qty[]" name="product_qty[]" type="text" style="width: 100px;" class="form-control"></td><td><input id="product_price[]" name="product_price[]" type="text" style="width: 100px;" class="form-control"></td><td><button class="remove_number btn btn-danger"><i class="el el-remove-circle"></i> Eliminar</button></td></tr>';
                var row = '<tr><td><input id="product_code[]" name="product_code[]" type="text" style="width: 100px;" class="search form-control"></td><td><input id="product_name[]" name="product_name[]" type="text" class="form-control"></td><td><input id="product_qty[]" name="product_qty[]" type="text" style="width: 100px;" class="form-control"></td><td><input id="product_price[]" name="product_price[]" type="text" style="width: 100px;" class="form-control"></td><td><button class="remove_number btn btn-danger"><i class="el el-remove-circle"></i> Eliminar</button></td></tr>';
                    jQuery('#product_list tr:last').after(row);
                    register_remove_event();
                });
                    
                function register_remove_event(){
                    jQuery('#product_list button.remove_number').on('click', function (e) {
                    e.preventDefault();
                    if(jQuery('#product_list tr').length > 2){
                        jQuery(this).parents('tr').remove();
                    }
                });
            }
            register_remove_event();
            
        });
</script>
All this modification permit this new functionality in the software.. can add one or multiple items

Works fine!!

 
                                 
            
