Question

我正在开发一个购物车系统，一切都很完美，除了一件事好吧，我使用PHP SESSION存储每个产品的数据，包括ID，名称，价格和数量。除非价格变量，否则所有变量都已正确完成。我不知道为什么！我使用jQuery来获取值并将它们发送到将在SESSION中处理它们的页面。
我将把代码的相关部分放在一边以方便。这是我的 products.php ：

的内容

<?php
        session_start();
?>
<html>
<body>
<?php
    $connection = new mysqli(DB_HOST, DB_USER, DB_PASS, DB_NAME);

    $sql = "SELECT id, name, price FROM products ORDER BY id";
    $result = $connection->query($sql);

    if ($result->num_rows > 0)
    {
            echo "<table>";
            echo "  <tr>";
            echo "      <th>ID</th>";
            echo "      <th>NAME</th>";
            echo "      <th>PRICE</th>";
            echo "      <th>QUANTITY</th>";
            echo "  </tr>";
        while($row = $result->fetch_assoc())
        {
            echo "  <tr>";
            echo "      <td><div class='id-product'>". $row["id"]."</div></td>";
            echo "      <td><div class='name-product'>". $row["name"]."</div></td>";
            echo "      <td>&#36;<div class='price-product'>". $row["price"]."</div></td>";
            echo "      <form class='add'>";
            echo "      <td><input type='number' name='quantity' value='1' min='1'/></td>";
            echo "      <td><button type='submit'>Add</button></td>";
            echo "      </form>";
            echo "  </tr>";
        }
            echo "</table>";
    }

    $connection->close();
?>
<script>
$(document).ready(function()
{
    $('.add').on('submit', function()
    {
        var id = $(this).closest('tr').find('.id-product').text();
        var name = $(this).closest('tr').find('.name-product').text();
        var price = $(this).closest('tr').find('.price-product').val();
        var quantity = $(this).closest('tr').find('input').val();
        window.location.href = "add.php?id=" + id + "&name=" + name + "&price=" + price + "&quantity=" + quantity;
        return false;
    });
});
</script>
<body>
</html>

现在在 add.php 我有以下内容：

<?php
    session_start();

    $id = isset($_GET['id']) ? $_GET['id'] : "";
    $name = isset($_GET['name']) ? $_GET['name'] : "";
    $price = isset($_GET['price']) ? $_GET['price'] : "";
    $quantity = isset($_GET['quantity']) ? $_GET['quantity'] : "";

    $cart_item = array
    (
        'id' => $id,
        'name' => $name,
        'price' => $price,
        'quantity' => $quantity
    );

    if(!isset($_SESSION['cart']))
    {
        $_SESSION['cart'] = array();
    }

    if(array_key_exists($id, $_SESSION['cart']))
    {
        header('Location: products.php?action=exists&id=' . $id . '&name=' . $name);
    }
    else if($quantity <= 0)
    {
        header('Location: products.php?action=invalidquantity&id=' . $id . '&name=' . $name);
    }
    else    
    {
        $_SESSION['cart'][$id] = $cart_item;
        header('Location: products.php?action=added&id=' . $id . '&name=' . $name);
    }
?>

要显示SESSION中存在的产品，我在页面 cart.php 中使用 foreach ：

$total = 0;
foreach($_SESSION['cart'] as $id)
{
    echo "<tr>";
        echo "<td>{$id['name']}</td>";
        echo "<td>&#36;{$id['price']}</td>";
        echo "<td>{$id['quantity']}</td>";
        echo "<td>";
        echo "<a href='remove.php?id={$id['id']}&name={$id['name']}'>Remove</a>";
        echo "</td>";
    echo "</tr>";

    $total += ($id['price'] * $id['quantity']);
}

正如我之前所说，我已经返回了ID，名称和数量的值，但价格仍然是空的。怎么了？

Answer 1

你不相信你的JS中的价格。

 window.location.href = "add.php?id=" + id + "&name=" + name + "&price" + price + "&quantity=" + quantity;
        return false;

应该是

 window.location.href = "add.php?id=" + id + "&name=" + name + "&price=" + price + "&quantity=" + quantity;
        return false;

Answer 2

请参阅jquery＆.39和.text

中的区别

Difference between val() and text()

试试这个：

var price = $(this).closest('tr').find('.price-product').text();

无理由变空

2 个答案: