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Полоса прогресса на карточке товара.

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Подскажите как можно на карточке товара организовать полосу прогресса набора заявок на товар. Чтоб клиенту было видно сколько человек оставило заявку на данный товар. По принципу сайтов совместных покупок. Пример прикладываю. Если есть шаблоны с подобным решением буду благодарен ссылке. 


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в catalog/model/catalog/product.php

public function getCountPurchased($product_id) { 
$sql = "SELECT SUM(quantity) as qty FROM " . DB_PREFIX . "order_product WHERE product_id='$product_id'"; 
$query = $this->db->query($sql);
$qty = $query->rows; return $qty[0]['qty']; 

затем в catalog/controller/product/product.php

$this->data['countpurchased'] = $this->model->getCountPurchased($product_id);

таким образом в catalog/view/theme/*/template/product/product.tpl

вам будет доступна переменная кол-ва купленых товаров - <?php echo $countpurchased; ?>


Дальше к ней любой js-прогрессбар прикручиваете. Тут уже зависит от личных требований и предпочтений. 



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