我创建了一个购物车按钮，在我的购物车页面中，我有一个总数量，我回应。我希望echo的值在我的购物车按钮中，但是当我尝试将回声添加到值时，它不起作用。有没有其他方法来构建这个以获取我的网址图像，值：购物车，以及要显示的回显数量？
我的购物车按钮：
<form class="shopcart" id="block right" action="shoppingcart.php">
<input type="submit" class="shopcart" name="shopcart" value="Shopping Cart <?php echo $totalquantity; ?> ">
</form>
总数量计算：
<?php
}
//Shopping Cart Quantity Count
if(isset($_SESSION['shopping_cart']) && is_array($_SESSION['shopping_cart'])) {
$totalquantity = 0;
foreach($_SESSION['shopping_cart'] AS $product) {
$totalquantity = $totalquantity + $product['quantity'];
}
}
else {
$totalquantity = 0;
}
echo $totalquantity;
?>
CSS：
/*----Add to cart Button-------*/
input.shopcart {
background-image: url(images/cart24.png);
background-color: transparent;
background-repeat: no-repeat;
background-position: 2px 5px 2px 5px;
vertical-align: middle;
width: 180px;
padding: 8px;
border-radius: 5px;
border: 1px solid #7ac9b7;
background-color: #12BDB8;
color: #F0F8FF;
font-weight: bold;
font-size: 15px;
cursor: pointer;
float: right;
text-align: center;
margin: 0px auto;
margin-top: -45px;
}
.shopcart:hover {
background-color: #10A8A3;
}
有没有更好的方法来使这项工作？我在每个页面上都有这个购物车按钮，并希望这样做，以便用户可以看到购物车中的数量。
快速提问。我无法从左上角获取设置为我的网址背景的购物车图片。无论我如何处理背景定位，它都会留在那里。任何人都能看到我做错了什么？
***编辑以显示总数量变量的位置
<form class="shopcart" id="block right"
action="shoppingcart.php">
<input type="submit" class="shopcart" name="shopcart" value="Shopping Cart">
</form>
</div>
</div>
</div>
<div class="whitepageOut">
<div class="whitepage">
<div class="content">
<h1>Shopping Cart</h1>
<!-- Add in additional info. I made the above up, to test. Correct when ready! -->
<div class="floatright">
<?php
echo "<p>
<a href='./shoppingcart.php?empty_cart=1'>Empty Cart</a>
</p>";
?>
</div>
<?php
// Initialize cart
if(!isset($_SESSION['shopping_cart'])) {
$_SESSION['shopping_cart'] = array();
}
// Update Cart
if(isset($_POST['update_cart'])) {
$quantities = $_POST['quantity'];
foreach($quantities as $id => $quantity) {
if(!isset($products[$id])) {
$message = "Invalid product!";
break;
}
$_SESSION['shopping_cart'][$id]['quantity'] = $quantity;
}
if(!$message) {
$message = "Cart updated!<br />";
}
}
// Empty cart
if(isset($_GET['empty_cart'])) {
$_SESSION['shopping_cart'] = array();
}
if(empty($_SESSION['shopping_cart'])){
echo "Your cart is empty<br />";
}
else {
echo $message;
?>
<form action='./shoppingcart.php?view_cart=1' method='POST'>
<table class="carttable">
<tr>
<th class="cartth">Name</th>
<th class="cartth">Price</th>
<th class="cartth">Category</th>
<th class="cartth">Quantity</th>
</tr>
<?php
$base_price = 0;
foreach($_SESSION['shopping_cart'] as $id => $product) {
$product_id = $product['product_id'];
$base_price += $products[$product_id]['price'] * $product['quantity'];
$shipping_price += $products[$product_id]['shippingprice'] * $product['quantity'];
?>
<tr>
<td class="carttd"><?php echo "<a href='./viewProduct.php?view_product=$id'>" . $product['name'];?><?php echo $products[$product_id]['name']; ?> </a>
</td>
<td class="carttd"><?php echo '$' . $products[$product_id]['price']; ?></td>
<td class="carttd"><?php echo $products[$product_id]['category']; ?></td>
<td class="carttd">
<?php echo "<input type='text' name='quantity[$product_id]' value='" . $product['quantity'] . "' />"; ?> </td>
</tr>
<?php
}
//Calculates total
$total_price += $base_price + $shipping_price;
?>
<tr>
<td colspan="2"></td>
<td class="tdcarttotal">Subtotal</td>
<td class="tdcarttotal"><?php echo "$" . $base_price; ?> </td>
</tr>
<tr>
<td colspan="2"></td>
<td class="tdcarttotal">Tax</td>
<td class="tdcarttotal">To be determined</td>
</tr>
<tr>
<td colspan="2"></td>
<td class="tdcarttotal">Shipping Price</td>
<td class="tdcarttotal"><?php echo "$" . $shipping_price; ?></td>
</tr>
<tr>
<td colspan="2"></td>
<td class="tdcarttotal">Total</td>
<td class="tdcarttotal"><?php echo "$" . $total_price; ?></td>
</tr>
</table>
<input type='submit' id='button' name='update_cart' value='Update Cart'>
</form>
<form action="checkout.php?checkout=1">
<input type="submit" class="checkoutbutton" value="Proceed to Checkout">
</form><br><br><br><br><br>
<?php
}
//Shopping Cart Quantity Count
if(isset($_SESSION['shopping_cart']) && is_array($_SESSION['shopping_cart'])) {
$totalquantity = 0;
foreach($_SESSION['shopping_cart'] AS $product) {
$totalquantity = $totalquantity + $product['quantity'];
}
}
else {
$totalquantity = 0;
}
echo $totalquantity;
?>
答案 0 :(得分：1)
在没有显示更多代码的情况下，我的猜测是您在变量实际分配值之前尝试显示按钮。
编辑：
添加javascript以更新提交按钮的值：
将<input type="submit" class="shopcart" name="shopcart" value="Shopping Cart">更改为<input type="submit" class="shopcart" name="shopcart" id="shopcart" value="Shopping Cart">。
在PHP代码的末尾添加：
echo "<script>document.getElementById('shopcart').value = 'Shopping Cart $totalquantity';</script>";
希望这能帮到你！