ajax更新购物车数量

把我最近写的一个代码贴出来可以参考但不一定适用。

一、首先我把这个输入框的代码贴出来

<INPUT class="input-text f-input"onblur="changePrice(document.getElementById('goods_number_{$goods.rec_id}').value,{$goods.rec_id})" name="goods_number[{$goods.rec_id}]" id="goods_number_{$goods.rec_id}" value="{$goods.goods_number}"id="ECS_FORMBUY">

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二、次页面加入的javascript 也就是changeprice函数

<script>
/**
* 点选可选属性或改变数量时修改商品价格的函数
*/
function changePrice(number,rec_id)
{
//v//ar attr = getSelectedAttributes(document.forms['ECS_FORMBUY']);
// var qty = document.forms['ECS_FORMBUY'].elements['number'].value;
Ajax.call('flow.PHP','step=update_group_cart&rec_id=' + rec_id +'&number=' + number,changePriceResponse,'GET','JSON');
}
/**
* 接收返回的信息
*/
function changePriceResponse(res)
{
if (res.error > 0)
{
document.getElementById('sysmsg_error').innerHTML = res.content;
document.all.sysmsg_error.style.display='';
}
else
{
if(document.all.sysmsg_error.style.display=='')
{
document.all.sysmsg_error.style.display='none';
}
document.getElementById('subtotal_'+res.rec_id).innerHTML = res.subtotal;//商品总价
document.getElementById('cart_amount').innerHTML = res.cart_amount;//购物车团购商品价
}
}
</script>
<script>
/**
* 点选可选属性或改变数量时修改商品价格的函数
*/
function changePrice(number,'JSON');
}
/**
* 接收返回的信息
*/
function changePriceResponse(res)
{
if (res.error > 0)
{
document.getElementById('sysmsg_error').innerHTML = res.content;
document.all.sysmsg_error.style.display='';
}
else
{
if(document.all.sysmsg_error.style.display=='')
{
document.all.sysmsg_error.style.display='none';
}
document.getElementById('subtotal_'+res.rec_id).innerHTML = res.subtotal;//商品总价
document.getElementById('cart_amount').innerHTML = res.cart_amount;//购物车团购商品价
}
}
</script>

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然后我把请求的PHP处理程序也贴出来

elseif($_REQUEST['step'] == 'update_group_cart')
{
/*------------------------------------------------------ */
//-- 西安PHP服务中心团购更新购物车
/*------------------------------------------------------ */
include_once('includes/cls_json.PHP');
$json = new JSON();
$result = array('error' => '','content' => '');
$rec_id = $_GET['rec_id'];
$number = $_GET['number'];
/*取的团购信息*/
$group_buy = group_buy_info($_SESSION['extension_id'],$number);
/*判断输入是否合法*/
if(!is_numeric($number))
{
$result['error'] = '1';
$result['content'] ='请输入合法数量';
die($json->encode($result));
}
if ($group_buy['restrict_amount'] > 0 && $number > ($group_buy['restrict_amount'] - $group_buy['valid_goods']))
{
$result['error'] = '1';
$restrict_amount =$group_buy['restrict_amount'] - $group_buy['valid_goods'];
$result['content'] ='您最多可买'.$restrict_amount.'件';
die($json->encode($result));
}
$sql = "UPDATE " . $GLOBALS['ecs']->table('cart') . " SET goods_number = '$number' WHERE rec_id = $rec_id";
$GLOBALS['db']->query($sql);
/*计算此订单总价*/
$subtotal = $GLOBALS['db']->getONE("select goods_price * goods_number AS subtotal from ".$GLOBALS['ecs']->table('cart')." where rec_id = $rec_id");
/*购物车团购商品总金额*/
$cart_amount = cart_amount('',$_SESSION['flow_type']);
$result['subtotal'] = price_format($subtotal,false);
$result['cart_amount'] = price_format($cart_amount,false);
$result['rec_id'] = $rec_id;
die($json->encode($result));
}

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原文链接：https://www.f2er.com/ajax/165754.html

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