我正在使用 PHP/mySQL 构建一个测试购物网站
这是我的代码:
show_product.php:
<form method ="get" action="addtocart.php">
<input type="hidden" name="id_product" value='.$row['id_product'].'>
<tr>
<th colspan="2"><a href="#">'.$row['name'].'</a></th>
</tr>
<td>
<a href="#"><img align="center" src='.$row['photo'].' alt=""></a>
</td>
<td>'.mb_substr($row['description'],0,200).'....</td>
<tr></tr>
<td>
'.$row['price'].'€<input type="number" name="quantity" value="1" min="1" max="20">
</td>
<td> <button type="submit" class="btn">add to cart</button></form>
addtocart.php
session_start()
if(isset($_GET) & !empty($_GET)){
$id_product = $_GET['id_product'];
if(isset($_GET['quantity']) & !empty($_GET['quantity'])){ $quant = $_GET['quantity']; }else{ $quant = 1;}
$_SESSION['cart'][$id_product] = array("quantity" => $quant);
header('location: cart.php');
}else{
header('location: cart.php');
}
echo "<pre>";
print_r($_SESSION['cart']);
echo "</pre>";
?>
和 cart.php 的一些代码
foreach ($cart as $key => $value) {
$cartsql = "SELECT * FROM product WHERE id_product=$key";
$cartres = mysqli_query($con, $cartsql);
$row = mysqli_fetch_assoc($cartres);
?>
<tr><form>
<td colspan="2"><?php echo $row['name'] ?></td>
<td><?php echo $row['price'].' €'; ?></td>
**<td><input type="number" class="quantity" name="quantity" value="<?php echo $value['quantity']; ?>"></td>**
<td><?php echo ($row['price']*$value['quantity']).' €'; ?> </td>
<td><a href="delcart.php?id_product=<?php echo $key; ?>"><img width="30" height="30" src="icons/delete.png" alt=""></a></td> </tr>
如果我向 addcart 发送一定数量的物品,它就可以工作。
问题是我无法更改cart.php 里面的数量,我对Javascript 知之甚少。请任何帮助如何做到这一点?