当我按下“加号”按钮时，我在更新产品数量时遇到问题，数量没有正确更新。当我有 1 个产品时它工作正常但是当我有 2 个或更多时，它没有更新并返回到初始值。 我有 updateQuantity 可以更新正常工作的产品。 请指导我如何解决这些问题。 我的 cart.php 代码：
<?php
ob_start(); // Start output buffering
session_start();
include_once $_SERVER["DOCUMENT_ROOT"] . "/database/db.php";
include 'header.php';
print_r($_SESSION);
// Initialize the cart total to 0
$total = 0;
$itemsincart = count($_SESSION['cart']);
if (isset($_SESSION['cart']) && count($_SESSION['cart']) > 0) {
// Get the product IDs from the cart
$productIds = array_keys($_SESSION['cart']);
// Prepare the SQL statement to retrieve the product details from the database
$stmt = $conn->prepare('SELECT * FROM products WHERE id IN (' . implode(',', $productIds) . ')');
$stmt->execute();
// Fetch the products from the database and store them in an array
$result = $stmt->get_result();
$products = array();
while ($row = $result->fetch_assoc()) {
$products[$row['id']] = $row;
}
// Insert cart data into the database for logged in users or temporary users
if (isset($_SESSION['user_id'])) {
$userId = $_SESSION['user_id'];
$createdAt = date('Y-m-d H:i:s');
echo "Count of cart items: " . count($_SESSION['cart']) . "<br>";
echo "Looping through cart items...<br>";
foreach ($_SESSION['cart'] as $productId => $quantity) {
$stmt = $conn->prepare('INSERT INTO cart (product_id, quantity, user_id, created_at) VALUES (?, ?, ?, ?)');
$stmt->bind_param('iiis', $productId, $quantity, $userId, $createdAt);
$stmt->execute();
if ($stmt->affected_rows > 0) {
echo "Data inserted successfully.";
} else {
echo "Error inserting data.";
}
$stmt->close();
}
} else {
$cartData = json_encode($_SESSION['cart']);
$createdAt = date('Y-m-d H:i:s');
$stmt = $conn->prepare('INSERT INTO temporary_carts (cart_data, created_at) VALUES (?, ?)');
$stmt->bind_param('ss', $cartData, $createdAt);
$stmt->execute();
if ($stmt->affected_rows > 0) {
echo "Data inserted successfully.";
} else {
echo "Error inserting data.";
}
$stmt->close();
}
?>
<section class="h-100 gradient-custom">
<div class="container py-5">
<div class="row d-flex justify-content-center my-4">
<div class="col-md-8">
<div class="card mb-4">
<div class="card-header py-3">
<h5 class="mb-0"><?php echo $itemsincart ?> محصول در سبد خرید</h5>
</div>
<div class="card-body">
<?php
// Display the cart items and their details
foreach ($_SESSION['cart'] as $productId => $quantity) {
$product = $products[$productId];
$subtotal = $product['off_price'] > 0 ? $product['off_price'] : $product['regular_price'];
$subtotaled = $subtotal * $quantity;
$total += $subtotaled;
?>
<!-- Single item -->
<div class="row">
<div class="col-lg-3 col-md-12 mb-4 mb-lg-0">
<!-- Image -->
<div class="bg-image hover-overlay hover-zoom ripple rounded"
data-mdb-ripple-color="light">
<img src="<?= $product['image'] ?>" class="w-100" alt="Blue Jeans Jacket" />
<a href="#!">
<div class="mask" style="background-color: rgba(251, 251, 251, 0.2)"></div>
</a>
</div>
<!-- Image -->
</div>
<div class="col-lg-5 col-md-6 mb-4 mb-lg-0">
<!-- Data -->
<p><strong>
<h2 class="name"><?= $product['name'] ?></h2>
</strong></p>
<p><?= $product['excerpt'] ?></p>
<form action="remove_item.php" method="post">
<input type="hidden" name="product_id" value="<?= $product['id'] ?>">
<button type="submit" class="remove-item btn btn-danger btn-sm me-1 mb-2"><i
class="fas fa-trash"></i></button>
</form>
<!-- Data -->
</div>
<div class="col-lg-4 col-md-6 mb-4 mb-lg-0">
<!-- Quantity -->
<div class="d-flex mb-4" style="max-width: 300px">
<button class="btn btn-primary px-3 me-2"
onclick="this.parentNode.querySelector('input[type=number]').stepDown()">
<i class="fas fa-minus"></i>
</button>
<div class="form-outline">
<input id="form1" min="1" max="<?= $product['quantity'] ?>" name="quantity"
value="<?= $quantity ?>" type="number" class="form-control" step="1" />
<label class="form-label" for="form1"></label>
</div>
<button class="btn btn-primary px-3 ms-2"
onclick="this.parentNode.querySelector('input[type=number]').stepUp()">
<i class="fas fa-plus"></i>
</button>
</div>
<!-- Quantity -->
<!-- Price -->
<div class="price text-start text-md-center"><?php
if ($product['off_price'] == NULL) {
echo "<strong><span class='regular-price'>" . "$" . $product["regular_price"] . "</span></strong>";
} else {
echo "<span style= 'text-decoration: line-through;' class='del-price'>" . "$" . $product["regular_price"] . "</span>";
echo "<br>";
echo "<strong><span class='offer-price'>" . "$" . $product["off_price"] . "</span></strong>";
} ?>
</div>
<div class="subtotal">
Subtotal: $<?= number_format($subtotaled) ?>
</div>
<span id="subtotaled"></span>
<!-- Price -->
</div>
</div>
<?php
}
} else {
echo "Your cart is empty.";
}
?>
</div>
<button class="btn btn-primary px-3 ms-2" onclick="updateQuantity(<?= $product['id'] ?>, 1)">
به روز رسانی محصول
</button>
</div>
</div>
<div class="col-md-4">
<div class="card mb-4">
<div class="card-header py-3">
<h5 class="mb-0">خلاصه خرید</h5>
</div>
<div class="card-body">
<ul class="list-group list-group-flush">
<li
class="list-group-item d-flex justify-content-between align-items-center border-0 px-0 pb-0">
جمع محصولات
<span><?php echo $total ?></span>
</li>
<li class="list-group-item d-flex justify-content-between align-items-center px-0">
Shipping
<span>Gratis</span>
</li>
<li
class="list-group-item d-flex justify-content-between align-items-center border-0 px-0 mb-3">
<div>
<strong>Total amount</strong>
<strong>
<p class="mb-0">(including VAT)</p>
</strong>
</div>
<span><strong>$53.98</strong></span>
</li>
</ul>
<button type="button" class="btn btn-primary btn-lg btn-block">
Go to checkout
</button>
</div>
</div>
</div>
</div>
</div>
</section>
<script>
function updateQuantity(productId) {
var newQuantity = document.querySelector('#form1').value;
var xhr = new XMLHttpRequest();
xhr.open('POST', 'updateQuantity.php');
xhr.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
xhr.onload = function() {
if (xhr.status === 200) {
var updatedProduct = JSON.parse(xhr.responseText);
document.querySelector('#form1').value = newQuantity;
// Reload the page
location.reload();
} else {
alert('Error updating quantity. Please try again.');
}
};
xhr.send('id=' + encodeURIComponent(productId) + '&quantity=' + encodeURIComponent(newQuantity));
}
</script>
<?php
include 'footer.php';
?>
我需要解决问题的帮助