我设计了一个购物车系统。当用户单击"添加到购物车"时，它正在刷新页面，然后单击提交后，它仅添加一个项目。我尝试一一添加项目，然后单击提交后才添加一个项目。我在某个地方犯了错误，但我不明白什么？你能告诉我吗？
代码：place-order.php
<?php
session_start();
require_once("dbcontroller.php");
?>
<div class="container">
<?php
$db_handle = new DBController();
if(!empty($_GET["action"])) {
if(!empty($_POST["quantity"])) {
$productByCode = $db_handle->runQuery("SELECT * FROM tblproduct WHERE code='" . $_GET["code"] . "'");
$itemArray = array($productByCode[0]["code"]=>array('name'=>$productByCode[0]["name"], 'code'=>$productByCode[0]["code"], 'quantity'=>$_POST["quantity"], 'price'=>$productByCode[0]["price"]));
if(!empty($_SESSION["cart_item"])) {
if(in_array($productByCode[0]["code"],array_keys($_SESSION["cart_item"]))) {
foreach($_SESSION["cart_item"] as $k => $v) {
if($productByCode[0]["code"] == $k) {
if(empty($_SESSION["cart_item"][$k]["quantity"])) {
$_SESSION["cart_item"][$k]["quantity"] = 0;
}
$_SESSION["cart_item"][$k]["quantity"] += $_POST["quantity"];
}
}
} else {
$_SESSION["cart_item"] = array_merge($_SESSION["cart_item"],$itemArray);
}
} else {
$_SESSION["cart_item"] = $itemArray;
}
}
}
?>
<div id="product-grid">
<div class="txt-heading">Products <a id="btnEmpty" href="reviewcart.php"><b>Submit</b></a></div>
<?php
$product_array = $db_handle->runQuery("SELECT * FROM tblproduct ORDER BY id ASC");
if (!empty($product_array)) {
foreach($product_array as $key=>$value){
?>
<div class="product-item">
<form method="post" action="place-order.php?action=add&code=<?php echo $product_array[$key]["code"]; ?>">
<div class="product-image"><img src="<?php echo $product_array[$key]["image"]; ?>"></div>
<div><strong><?php echo $product_array[$key]["name"]; ?></strong></div>
<div class="product-price"><?php echo "$".$product_array[$key]["price"]; ?></div>
<div><input type="text" name="quantity" value="1" size="2" /><input type="submit" value="Add to cart" class="btnAddAction" /></div>
</form>
</div>
<?php
}
}
?>
</div>
reviewcart.php
<?php
error_reporting(E_ERROR | E_PARSE);
session_start();
require_once("dbcontroller.php");
$db_handle = new DBController();
if(!empty($_GET["action"])) {
switch($_GET["action"]) {
case "add":
if(!empty($_POST["quantity"])) {
$productByCode = $db_handle->runQuery("SELECT * FROM tblproduct WHERE code='" . $_GET["code"] . "'");
$itemArray = array($productByCode[0]["code"]=>array('name'=>$productByCode[0]["name"], 'code'=>$productByCode[0]["code"], 'quantity'=>$_POST["quantity"], 'price'=>$productByCode[0]["price"]));
if(!empty($_SESSION["cart_item"])) {
if(in_array($productByCode[0]["code"],array_keys($_SESSION["cart_item"]))) {
foreach($_SESSION["cart_item"] as $k => $v) {
if($productByCode[0]["code"] == $k) {
if(empty($_SESSION["cart_item"][$k]["quantity"])) {
$_SESSION["cart_item"][$k]["quantity"] = 0;
}
$_SESSION["cart_item"][$k]["quantity"] += $_POST["quantity"];
}
}
} else {
$_SESSION["cart_item"] = array_merge($_SESSION["cart_item"],$itemArray);
}
} else {
$_SESSION["cart_item"] = $itemArray;
}
}
break;
case "remove":
if(!empty($_SESSION["cart_item"])) {
foreach($_SESSION["cart_item"] as $k => $v) {
if($_GET["code"] == $k)
unset($_SESSION["cart_item"][$k]);
if(empty($_SESSION["cart_item"]))
unset($_SESSION["cart_item"]);
}
}
break;
case "empty":
unset($_SESSION["cart_item"]);
break;
}
}
?>
<div class="c-layout-sidebar-content ">
<!-- BEGIN: PAGE CONTENT -->
<div class="c-content-title-1 c-margin-t-30">
<h3 class="c-font-uppercase c-font-bold c-center ">Place Order</h3>
<div class="c-content-panel">
<div class="c-body">
<div class="row">
<div class="col-md-12">
<table class="table table-condensed">
<div id="shopping-cart">
<div class="txt-heading">Shopping Cart <a id="btnEmpty" href="reviewcart.php?action=empty">Empty Cart</a></div>
<?php
if(isset($_SESSION["cart_item"])){
$item_total = 0;
?>
<table class="col-md-12" cellpadding="10" cellspacing="1" >
<tbody class="col-md-12">
<tr>
<form action="reviewcart.php" method="post">
<th class="col-md-4" style="text-align:center;"><strong>Name</strong></th>
<th class="col-md-4" style="text-align:center;"><strong>Code</strong></th>
<th class="col-md-4" style="text-align:center;"><strong>Quantity</strong></th>
<th class="col-md-3" style="text-align:center;"><strong>Action</strong></th>
</tr>
<?php
foreach ($_SESSION["cart_item"] as $item){
?>
<tr>
<td style="text-align:center;border-bottom:#F0F0F0 1px solid;" >
<strong><?php echo $item["name"]; ?></strong>
<input type="hidden" name="name" value="<?php echo $item['name']?>">
</td>
<td style="text-align:center;border-bottom:#F0F0F0 1px solid;">
<?php echo $item["code"]; ?>
<input type="hidden" name="code" value="<?php echo $item['code']?>">
</td>
<td style="text-align:center;border-bottom:#F0F0F0 1px solid;">
<?php echo $item["quantity"]; ?>
<input type="hidden" name="quantity" value="<?php echo $item['quantity']?>">
</td>
<!-- <td style="text-align:center;border-bottom:#F0F0F0 1px solid;">
<?php $price=$_POST['price'] ; echo $price ?>
</td> -->
<td style="text-align:center;border-bottom:#F0F0F0 1px solid;">
<a href="reviewcart.php?action=remove&code=<?php echo $item["code"]; ?>" class="btnRemoveAction">
Remove Item
</a>
</td>
</tr>
<!-- <?php
$item_total += ($item["price"]*$item["quantity"]);
}
?>
-->
<tr>
<td colspan="5" align=right><input type="submit" name="submit" value="submit" /></td>
</tr></form>
</tbody>
</table>
<?php
}
?>
</div>
</table>
</div>
</div>
</div>
</div>
</div>
</div>
为什么不刷新页面？
您可以将页面上列出的每个物品视为复选框，然后在提交时，只需将所有复选框项目添加到购物车中即可。显然，无需像复选框那样设计它，只需在后端代码中以这种方式工作。
然后，只需确保每次提交购物车或远离页面上时，它首先提交表单（如果不是空），然后导航。