Price and stock don't update when picking another variant

<?php
defined('_JEXEC') or die('Restricted access');
?>
<?php

function hikashop_characteristics_html(&$element,&$params,&$obj){
    switch($params->get('characteristic_display')){
        case 'table':
            if(count($obj->characteristics)==2){
                $html = '';
                $firstCharacteristic = reset($obj->characteristics);
                $secondCharacteristic = end($obj->characteristics);

                $html.= '<table class="hikashop_product_characteristic_chooser"><tr><td></td>';
                if(!empty($secondCharacteristic->values)){
                    foreach($secondCharacteristic->values as $value){
                        $html.='<td>'.$value->characteristic_value.'</td>';
                    }
                }
                $html.='</tr>';
                $obj->options=' onclick="return hikashopUpdateVariantData(this.value);"';
                $size=0;
                if(!empty($firstCharacteristic->values)){
                    foreach($firstCharacteristic->values as $value){
                        $html.='<tr><td style="text-align:right">'.$value->characteristic_value.'</td>';
                        if(strlen($value->characteristic_value)>$size)$size=strlen($value->characteristic_value);
                        if(!empty($secondCharacteristic->values)){
                            foreach($secondCharacteristic->values as $value2){
                                $class = '';
                                $classspan = '';
                                foreach($element->variants as $k => $variant){
                                    $char1 = false;
                                    $char2 = false;
                                    foreach($variant->characteristics as $variantCharacteristic){
                                        if($variantCharacteristic->characteristic_id==$value->characteristic_id){
                                            $char1 = true;
                                        }elseif($variantCharacteristic->characteristic_id==$value2->characteristic_id){
                                            $char2 = true;
                                        }
                                        if($char1&&$char2){
                                            if(!$variant->product_published || $variant->product_quantity==0){
                                                $class = ' hikashop_product_variant_out_of_stock';
                                                $classspan=' hikashop_product_variant_out_of_stock_span';
                                            }
                                            break 2;
                                        }
                                    }
                                }

                                $name = '_'.$value->characteristic_id.'_'.$value2->characteristic_id;
                                $radio="\n\t<span class=\"hikashop_product_characteristic_span".$classspan."\"><input type=\"radio\" class=\"hikashop_product_characteristic".$class."\" name=\"hikashop_product_characteristic\" id=\"hikashop_product_characteristic".$name."\" value=\"".$name."\" ".$obj->options;
                                if($obj->characteristics[$value->characteristic_parent_id]->default->characteristic_id==$value->characteristic_id && !empty($obj->characteristics[$value2->characteristic_parent_id]->default->characteristic_id) && $obj->characteristics[$value2->characteristic_parent_id]->default->characteristic_id==$value2->characteristic_id){
                                    $radio.=' checked';
                                }
                                $radio.=" /></span>";
                                $html.='<td>'.$radio.'</td>';
                            }
                        }
                        $html.='</tr>';
                    }
                }
                $html.='</table>';
                if($params->get('characteristic_display_text')){
                    $space = '';
                    for($i=0;$i<=$size;$i++){
                        $space.='&nbsp;&nbsp;';
                    }
                    $html='<table class="hikashop_product_characteristic_chooser"><tr><td></td><td class="hikashop_charactersitic_name">'.$space.@$secondCharacteristic->characteristic_value.'</td></tr><tr><td class="hikashop_charactersitic_name">'.$firstCharacteristic->characteristic_value.'</td><td>'.$html.'</td></table>';
                }
                break;
            }
        default:
        case 'radio':
        case 'dropdown':
            $main_html = '<table class="hikashop_product_characteristics_table">';
            $config =& hikashop_config();
            foreach($obj->characteristics as $characteristic){
                $main_html.='<tr style="vertical-align: top;">';
                $values = array();
                $switch_done = false;
                if(!empty($characteristic->values)){
                    foreach($characteristic->values as $k => $value){
                        if(!$config->get('show_out_of_stock',1)){
                            $hasQuantity = false;
                            foreach($element->variants as $variant){
                                foreach($variant->characteristics as $variantCharacteristic){
                                    if($variantCharacteristic->characteristic_id==$value->characteristic_id){
                                        if($variant->product_quantity != 0){
                                            $hasQuantity = true;
                                        }elseif( $element->product_id==$variant->product_id && !$switch_done){
                                            $id = 'hikashop_product_characteristic_'.$characteristic->characteristic_id;
                                            $js = "
                                            window.hikashop.ready( function() {hikashopUpdateVariant(document.getElementById('".$id."'));});";
                                            if (!HIKASHOP_PHP5) {
                                                $doc =& JFactory::getDocument();
                                            }else{
                                                $doc = JFactory::getDocument();
                                            }
                                            $doc->addScriptDeclaration("\n<!--\n".$js."\n//-->\n");
                                            $switch_done = true;
                                        }
                                    }
                                }
                            }
                            if(!$hasQuantity) continue;
                        }
                        $values[$k]=$value->characteristic_value;
                    }
                }


                $html=$obj->display(@$characteristic->characteristic_id,@$characteristic->default->characteristic_id,$values,$characteristic->characteristic_display_method);
                if($params->get('characteristic_display_text') && isset($characteristic->characteristic_value)){
                    $html=$characteristic->characteristic_value.'</td><td>'.$html;
                }
                $main_html.='<td>'.$html.'</td></tr>';
            }
            $main_html.='</table>';
            $html = $main_html;
            break;
    }
    
    return $html;
}
?>