Question

我也无法更新购物车和数据库表中的商品数量。有没有错误？我没有使用会话记录添加到购物车中的商品。对不起，我不擅长编码。为我的最后一年项目做这件事。谢谢！

<form action="" method="post" enctype="multipart/form-data">
<table width="100%"  cellpadding="6" cellspacing="0">
    <thead>
        <tr height="32">
            <th width="10%">QTY</th>
            <th width="37%">ITEM(S)</th>
            <th width="18%">PRICE</th>
            <th width="19%">TOTAL</th>
            <th width="16%">REMOVE</th>
        </tr>
    </thead>
    <tbody>
    <?php

    $total = 0; //set initial total value

    global $con;
    $ip = getIp();

    $sel_price = "select * from cart where ip_add = '$ip'";
    $run_price = mysqli_query($con, $sel_price);

    while($p_price = mysqli_fetch_array($run_price)){

        $qty = $p_price['qty'];
        $cart_id = $p_price['cart_id'];
        $pac_id = $p_price['p_id'];
        $pac_price = "select * from package where package_id = '$pac_id'";
        $run_pac_price = mysqli_query($con, $pac_price);

        while($pp_price = mysqli_fetch_array($run_pac_price)){
        //set variables to use in content below
        $package_title = $pp_price['package_title'];
        $package_image = $pp_price['package_image'];
        $package_price = array($pp_price['package_price']);
        $single_price = $pp_price['package_price'];


        $subtotal = ($single_price * $qty); //calculate Price x Qty
        $total = ($total + $subtotal); //add subtotal to total var





?>
        <tr class="'.$bg_color.'">
            <td><input type="text" size="2" maxlength="2" name="qty" value="<?php echo $_SESSION['qty'];?>" />
            </td>
            //update quantity part
            <?php

    if(isset($_POST['update_cart'])){

        $qty = $_POST['qty'];
        $update_qty = "update cart set qty='$qty' where cart_id='$cart_id'";
        $run_qty = mysqli_query($con, $update_qty);

        $_SESSION['qty']=$qty;

        $subtotal = ($single_price * $_SESSION['qty']);

    }

    ?>

            <td><br><?php echo $package_title; ?><br>
    <img src="admin_area/product_images/<?php echo $package_image; ?>" width="80" height="80"/><br></td>
            <td><?php echo "RM".$single_price; ?></td>
            <td><?php echo "RM".$subtotal; ?></td>
            <td><a href="removefromcart.php?delete_cart=<?php echo $cart_id ?>"><img src ="admin_area/img/icons/delete.png"/></a></td>

        </tr>

<?php }} ?>
<tr>
    <td colspan="5">
    <span style="float:right;text-align: right;">Amount Payable : <?php echo "RM" .sprintf("%01.2f", $total);?>     
    </span>
    </td>
</tr>
<tr>
    <td colspan="5">
    <a href="checkout.php" class="button">Checkout</a>
    <a href="funeral_package.php" class="button">Add More Items</a>
    <button type="submit" name="update_cart">Update</button>
    </td>
</tr>
    </tbody>
</table>

</form>

Answer 1

我在这里使用$ PreV_qty作为变量。这意味着你必须获得之前的数量，然后更新

if(isset($_POST['update_cart'])){ 


$PreV_qty = $_SESSION['qty'];
$qty = $PreV_qty+$_POST['qty'];
$update_qty = "update cart set qty='$qty' where cart_id='$cart_id'";
$run_qty = mysqli_query($con, $update_qty);
$_SESSION['qty']=$qty;

$subtotal = ($single_price * $_SESSION['qty']);
}

Answer 2

尝试将以下部分移到脚本顶部

if(isset($_POST['update_cart'])){

    $qty = $_POST['qty'];
    $update_qty = "update cart set qty='$qty' where cart_id='$cart_id'";
    $run_qty = mysqli_query($con, $update_qty);

    $_SESSION['qty']=$qty;

    $subtotal = ($single_price * $_SESSION['qty']);

}

或以上<form action="" method="post" enctype="multipart/form-data">

无法更新数量，继续显示数量值＆＃39; 1＆＃39;

2 个答案: