ecshop的购物车使用是相当的不方便．ecshop购物车一旦加入了商品，就必须点更新数量的按扭才能够更新．这样对ecshop使用者相当的不方便。我们将结合ecshop ajax的思路。来讲讲用ecshop的ajax无刷新更新购物车.

    1:首先要包含js/shopping_flow.js 该文件主要是针对ecshop购买流程控制的js.我们将增加以下函数．

    function submit_update_cart(rec_id){
 var goods_number = document.getElementById("goods_number_"+rec_id).value;
 
 Ajax.call('flow.php?step=ajax_update_cart', 'goods_number=' + goods_number+'&rec_id='+rec_id, submit_update_cartResponse_cart, 'GET', 'JSON');
 }
 

   2:在flow.dwt中。我们要修改input输入框．<input type="text" name="goods_number[{$goods.rec_id}]" id="goods_number_{$goods.rec_id}"

   3:在ecshop的购物车函数中。什么json来结合ecshop ajax处理更新结果．部分程序如下

   include_once('includes/cls_json.php');
    $result = array('error' => '', 'content' => '', 'fanliy_number' => '0', 'rec_id' => '');
 $json = new JSON();

 /* AJAX修改购物车 */
 $rec_id   = $_REQUEST['rec_id']; //购物车ID
 $goods_number   = $_REQUEST['goods_number'];//
 
   
 /* 判断库存 */
 $num = $db -> getOne("select g.goods_number from ".$ecs->table('goods')." g ,".$ecs->table('cart')." c where c.rec_id = '$rec_id' and g.goods_id = c.goods_id ");
 if($goods_number > $num){
  $goods_number = $num;
  $result['error']  = 1;
  $result['fanliy_number']= $num;
  $result['rec_id']       = $rec_id;
  $result['content']  = '该商品库存不足'.$goods_number." 件,只有".$num."件";
  die($json->encode($result));

 }

 /* 修改商品购物车 */
 $sql = "update ".$ecs->table('cart')." set goods_number = '".$goods_number."' where rec_id = '".$rec_id."' and session_id = '" . SESS_ID . "' ";
 $db -> query($sql);

    4:通过flow.php中的php．返回更新数量后的结果．

   function submit_update_cartResponse_cart(result){
    
 if(result.error == '1'){
  document.getElementById("goods_number_"+result.rec_id).value = result.fanliy_number;
  alert(result.content)
 }else{
  var layer = document.getElementById("xianshi_price");
       
  layer.innerHTML = (typeof result == "object") ? result.content : result;
 }
 }

    通过以上ecshop二次开发例子，我们好模板完成了ecshop购物车无刷新更新。