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

1. <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">
   
2. 
   

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二、次 页面加入的javascript 也就是changeprice函数

1. 
   
2. <script>
   
3. /**
   
4. * 点选可选属性或改变数量时修改商品价格的函数
   
5. */
   
6. function changePrice(number,rec_id)
   
7. {
   
8.   //v//ar attr = getSelectedAttributes(document.forms['ECS_FORMBUY']);
   
9. // var qty = document.forms['ECS_FORMBUY'].elements['number'].value;
   
10.   
    
11.    Ajax.call('flow.php', 'step=update_group_cart&rec_id=' + rec_id +'&number=' + number, changePriceResponse, 'GET', 'JSON');
    
12. }
    
13. /**
    
14. * 接收返回的信息
    
15. */
    
16. function changePriceResponse(res)
    
17. {
    
18.   if (res.error > 0)
    
19.   {
    
20.     document.getElementById('sysmsg_error').innerHTML = res.content;
    
21.     document.all.sysmsg_error.style.display='';
    
22.   }
    
23.   else
    
24.   {
    
25.     if(document.all.sysmsg_error.style.display=='')
    
26.   {
    
27.    document.all.sysmsg_error.style.display='none';
    
28.   }
    
29.   document.getElementById('subtotal_'+res.rec_id).innerHTML = res.subtotal;//商品总价
    
30.   document.getElementById('cart_amount').innerHTML = res.cart_amount;//购物车团购商品价
    
31.   
    
32.   }
    
33. }
    
34. </script>
    
35. <script>
    
36. /**
    
37. * 点选可选属性或改变数量时修改商品价格的函数
    
38. */
    
39. function changePrice(number,rec_id)
    
40. {
    
41.   //v//ar attr = getSelectedAttributes(document.forms['ECS_FORMBUY']);
    
42. // var qty = document.forms['ECS_FORMBUY'].elements['number'].value;
    
43.   
    
44.    Ajax.call('flow.php', 'step=update_group_cart&rec_id=' + rec_id +'&number=' + number, changePriceResponse, 'GET', 'JSON');
    
45. }
    
46. /**
    
47. * 接收返回的信息
    
48. */
    
49. function changePriceResponse(res)
    
50. {
    
51.   if (res.error > 0)
    
52.   {
    
53.     document.getElementById('sysmsg_error').innerHTML = res.content;
    
54.     document.all.sysmsg_error.style.display='';
    
55.   }
    
56.   else
    
57.   {
    
58.     if(document.all.sysmsg_error.style.display=='')
    
59.   {
    
60.    document.all.sysmsg_error.style.display='none';
    
61.   }
    
62.   document.getElementById('subtotal_'+res.rec_id).innerHTML = res.subtotal;//商品总价
    
63.   document.getElementById('cart_amount').innerHTML = res.cart_amount;//购物车团购商品价
    
64.   
    
65.   }
    
66. }
    
67. </script>

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然后我把请求的php处理 程序也贴出来

1. 
   
2. elseif($_REQUEST['step'] == 'update_group_cart')
   
3. {
   
4.     /*------------------------------------------------------ */
   
5.     //-- 西安php服务中心团购更新购物车
   
6.     /*------------------------------------------------------ */
   
7.     include_once('includes/cls_json.php');
   
8.     $json = new JSON();
   
9.     $result = array('error' => '', 'content' => '');
   
10. $rec_id = $_GET['rec_id'];
    
11. $number = $_GET['number'];
    
12.   
    
13.   /*取的团购信息*/
    
14.     $group_buy = group_buy_info($_SESSION['extension_id'], $number);
    
15. 
    
16. /*判断输入是否合法*/
    
17. if(!is_numeric($number))
    
18. {
    
19.           $result['error'] = '1';
    
20.        $result['content'] ='请输入合法数量';
    
21.        die($json->encode($result));
    
22. 
    
23. }
    
24.     if ($group_buy['restrict_amount'] > 0 && $number > ($group_buy['restrict_amount'] - $group_buy['valid_goods']))
    
25.     {
    
26.           $result['error'] = '1';
    
27.     $restrict_amount =  $group_buy['restrict_amount'] - $group_buy['valid_goods'];
    
28.     $result['content'] ='您最多可买'.$restrict_amount.'件';
    
29.        die($json->encode($result));
    
30.    }
    
31.     $sql = "UPDATE " . $GLOBALS['ecs']->table('cart') . " SET goods_number = '$number' WHERE rec_id = $rec_id";
    
32.    $GLOBALS['db']->query($sql);
    
33. /*计算此订单总价*/
    
34. $subtotal = $GLOBALS['db']->getONE("select goods_price * goods_number AS subtotal from ".$GLOBALS['ecs']->table('cart')." where rec_id = $rec_id");
    
35.    /*购物车团购商品总金额*/
    
36.    $cart_amount = cart_amount('',$_SESSION['flow_type']);
    
37. $result['subtotal'] = price_format($subtotal, false);
    
38. $result['cart_amount'] = price_format($cart_amount, false);
    
39. $result['rec_id'] = $rec_id;
    
40.     die($json->encode($result));
    
41. }

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