我在构建购物车时遇到了一些问题。
我没有多次点击添加按钮来更改数量，而是想直接在输入中更改它。它运作良好，但当你删除购物车中的一个项目时，所有其他项目的价格将被设置为零，我不知道为什么会发生这种情况。
我正在使用的购物车是PHP / SQL和AJAX。
到目前为止，这是我的代码：
PHP：
<?php
// This document contains the AJAX generated for the building-cart
/////////////////////////////////////////////////////////////////
// Clear Cache and include config.php
include("includes/config.php");
// Start Session
session_start();
?>
<?php
$product_id = $_GET['id']; //the product id from the URL
$action = $_GET['action']; //the action from the URL
$quantity = $_GET['quantity']; //the action from the URL
// if there is an product_id and that product_id doesn't exist display an error message
if($product_id && !productExists($product_id)) {
die("Error. Product Doesn't Exist");
}
// decide what to do
switch($action) {
case "add":
//add one to the quantity of the product with id $product_id
if($_SESSION['cart'][$product_id] < 1) { $_SESSION['cart'][$product_id]++; }
break;
case "remove":
$_SESSION['cart'][$product_id]--; //remove one from the quantity of the product with id $product_id
if($_SESSION['cart'][$product_id] == 0) unset($_SESSION['cart'][$product_id]); //if the quantity is zero, remove it completely (using the 'unset' function) - otherwise is will show zero, then -1, -2 etc when the user keeps removing items.
break;
case "empty":
unset($_SESSION['cart']); //unset the whole cart, i.e. empty the cart.
break;
}
?>
<?php
//if the cart isn't empty show the cart
if($_SESSION['cart']) {
echo '<ul id="cart-items">'."\n";
//iterate through the cart, the $product_id is the key and $quantity is the value
foreach($_SESSION['cart'] as $product_id => $quantity) {
//get the name, description and price from the database - this will depend on your database implementation.
//use sprintf to make sure that $product_id is inserted into the query as a number - to prevent SQL injection
$result = mysql_query("SELECT * FROM single_partners WHERE single_id = $product_id");
//Only display the row if there is a product (though there should always be as we have already checked)
if(mysql_num_rows($result) > 0) {
if($test = mysql_fetch_array($result)) {
$partner_id = $test['partner_id'];
$partner_price = $test['price'];
$line_cost = $partner_price * quantity; //work out the line cost
$total = $total + $line_cost; //add to the total cost
}
// Get partner name
$get_partner_name = mysql_query("SELECT * FROM partners WHERE partner_id='$partner_id'");
if($partner_name = mysql_fetch_array($get_partner_name)) {
$name = $partner_name['name'];
$logo = $partner_name['logo'];
$type = $partner_name['type'];
$logo_dir = "media/partners/build/color/";
}
echo '<li>'."\n";
echo '<div class="logo" style="background-image: url('.$logo_dir.$logo.')">'."\n";
echo '</div>'."\n";
echo '<div class="details">'."\n";
echo '<span class="name">'.$name.'</span>'."\n";
echo '<span class="details">Detaljer</span>'."\n";
echo '</div>'."\n";
echo '<div class="price"><input name="partner" type="hidden" value="'.$product_id.'" /><span class="remove-button"></span>'."\n";
echo '<span class="price">'.number_format((float)$line_cost, 2, ',', '').'</span>'."\n";
echo '</div>'."\n";
echo '</li>'."\n";
}
}
echo '<div class="footer">'."\n";
echo '<span class="empty-button">Tøm</span>'."\n";
echo '<span class="total-price">'.number_format((float)$total, 2, ',', '').'</span>'."\n";
echo '</div>'."\n";
//show the total
// echo "<tr>";
// echo "<td colspan=\"2\" align=\"right\">Total</td>";
// echo "<td align=\"right\">$total</td>";
// echo "</tr>";
//
// //show the empty cart link - which links to this page, but with an action of empty. A simple bit of javascript in the onlick event of the link asks the user for confirmation
// echo "<tr>";
// echo "<td colspan=\"3\" align=\"right\"><a href=\"$_SERVER[PHP_SELF]?action=empty\" onclick=\"return confirm('Are you sure?');\">Empty Cart</a></td>";
// echo "</tr>";
echo '</ul>'."\n";
}else{
//otherwise tell the user they have no items in their cart
//echo "You have no items in your shopping cart.";
}
//function to check if a product exists
function productExists($product_id) {
//use sprintf to make sure that $product_id is inserted into the query as a number - to prevent SQL injection
$sql = mysql_query("SELECT * FROM single_partners WHERE single_id = $product_id");
return mysql_num_rows($sql) > 0;
}
?>
AJAX：
// Load building cart, when adding items
$(document).on('click', 'input[type=button].add-button', function() {
// AJAX - Define data to send
var actiontype = "add";
productid = $('input[name="address"]').val();
quantity = $('input[name="qun"]').val();
var data = "action="+ actiontype + "&id="+ productid + "&quantity="+ quantity;
$.ajax({
url: 'buildingcart.php',
data: data,
success:function(result) {
// Show result
$('#building-cart .content').html(result);
}
});
});
// Load building cart, when adding items
$(document).on('click', '.remove-button', function() {
// AJAX - Define data to send
var actiontype = "remove";
productid = $(this).parent().find('input[name="partner"]').val();
var data = "action="+ actiontype + "&id="+ productid;
$.ajax({
url: 'buildingcart.php',
data: data,
success:function(result) {
// Show result
$('#building-cart .content').html(result);
}
});
});
// Load building cart, when adding items
$(document).on('click', '.empty-button', function() {
// AJAX - Define data to send
var actiontype = "empty";
var data = "action="+ actiontype;
$.ajax({
url: 'buildingcart.php',
data: data,
success:function(result) {
// Show result
$('#building-cart .content').html(result);
}
});
});
我尝试过更改
foreach($_SESSION['cart'] as $product_id => $quantity)
到
foreach($_SESSION['cart'] as $product_id)
没有运气。
答案 0 :(得分：3)
你在这一行忘记了一个$符号
$ line_cost = $ partner_price *数量; //计算出行费用
应该是
$ line_cost = $ partner_price * $ quantity; //计算出行费用
编辑： 您也可能希望优化代码，只能选择一个sql：
//if the cart isn't empty show the cart
if($_SESSION['cart']) {
echo '<ul id="cart-items">'."\n";
$productIds = implode(",", array_keys($_SESSION['cart']));
$sql = "
SELECT
single_partners.single_id AS product_id,
single_partners.partner_id,
single_partners.price,
partners.name,
partners.logo,
partners.type
FROM single_partners
INNER JOIN partners
ON partners.partner_id = single_partners.partner_id
WHERE single_id IN ({$productIds})
";
$result = mysql_query($sql);
$logo_dir = "media/partners/build/color/";
if(mysql_num_rows($result) > 0) {
while($row = mysql_fetch_array($result)) {
$product_id = $row['product_id'];
$partner_id = $row['partner_id'];
$partner_price = $row['price'];
$name = $row['name'];
$logo = $row['logo'];
$type = $row['type'];
$quantity = $_SESSION['cart'][$product_id];
$line_cost = $partner_price * $quantity; //work out the line cost
$total = $total + $line_cost; //add to the total cost
echo '<li>'."\n";
echo '<div class="logo" style="background-image: url('.$logo_dir.$logo.')">'."\n";
echo '</div>'."\n";
echo '<div class="details">'."\n";
echo '<span class="name">'.$name.'</span>'."\n";
echo '<span class="details">Detaljer</span>'."\n";
echo '</div>'."\n";
echo '<div class="price"><input name="partner" type="hidden" value="'.$product_id.'" /><span class="remove-button"></span>'."\n";
echo '<span class="price">'.number_format((float)$line_cost, 2, ',', '').'</span>'."\n";
echo '</div>'."\n";
echo '</li>'."\n";
}
}
echo '</ul>'."\n";
}
else{
//otherwise tell the user they have no items in their cart
//echo "You have no items in your shopping cart.";
}