ecshop 团购点击价格变动

前提：价格阶梯只能设置一级

需要用到： jquery，transport.js（transport_jquery.js），Ajax.call

html页面

js代码，还需要插入jquery，transport.js（支持ajax插件的）文件

/**
 * 点选可选属性或改变数量时修改商品价格的函数
 */
 var goodsId = {$group_buy.goods_id};  // 参加团购产品的id，需要获取团购设置的初始价格
 var act_id = {$group_buy.act_id};  //   扩展类别属性
function changePrice()
{
	
  var attr = getSelectedAttributes(document.forms['ECS_FORMBUY']);
  var qty = document.forms['ECS_FORMBUY'].elements['number'].value;
  //alert('act=price&id=' + goodsId +'&act_id='+ act_id  + '&attr=' + attr + '&number=');
 Ajax.call('group_buy.php', 'act=price&id=' + goodsId +'&act_id='+ act_id  + '&attr=' + attr + '&number=' + qty, changePriceResponse, 'GET', 'JSON');

}

/**
 * 接收返回的信息
 */
function changePriceResponse(res)
{
  if (res.err_msg.length > 0)
  {
    alert(res.err_msg);
  }
  else
  {
    document.forms['ECS_FORMBUY'].elements['number'].value = res.qty;

    if (document.getElementById('ECS_GOODS_AMOUNT'))
      document.getElementById('ECS_GOODS_AMOUNT').innerHTML = res.result;
	  //alert(res.result);
  }
}
/*新增 商品点击效果*/
function changeAtt(t,src,key) {
	//alert(key);
	document.getElementById('spec_value_'+src).checked='checked';
	div = document.getElementById("EXP_"+key);
	elems = div.getElementsByTagName("dl")[0].getElementsByTagName("a");
	for(i=0;i<elems.length;i++){
		elems[i].className='';	
	}
	t.className = "on";
	//elems[t].getElementsByTagName("span")[0].style.display="block";
	changePrice();
}

php文件 　group_buy.php?act=price  ,另一个是扩展属性（价格）function group_attr(){}  

/*------------------------------------------------------ */
//-- 改变属性、数量时重新计算商品价格
/*------------------------------------------------------ */

elseif (!empty($_REQUEST['act']) && $_REQUEST['act'] == 'price')
{
    include('includes/cls_json.php');
    
    $goods_id = $_GET['id'];
    $act_id = $_GET['act_id'];
    $attr = $_GET['attr'];
    $attr = explode(',',$_GET['attr']);  // 注意这里传递过来的值，有可能是1个值或者2个值或者3个值，具体的要看扩展属性有几个阶梯 
    foreach($attr as $v){
        $attr_price[] = group_attr($v);    
    }
    $total_attr_price = array_sum($attr_price);  // 所有扩展分类的总价格
    
    $json   = new JSON;
    $res    = array('err_msg' => '', 'result' => '', 'qty' => 1);

    $attr_id    = isset($_REQUEST['attr']) ? explode(',', $_REQUEST['attr']) : array();
    $number     = (isset($_REQUEST['number'])) ? intval($_REQUEST['number']) : 1;

    if ($goods_id == 0)
    {
        $res['err_msg'] = $_LANG['err_change_attr'];
        $res['err_no']  = 1;
    }
    else
    {
        if ($number == 0)
        {
            $res['qty'] = $number = 1;
        }
        else
        {
            $res['qty'] = $number;
        }

      // $shop_price  = get_final_price($goods_id, $number, true, $attr_id);
        $group_info = group_buy_info($act_id);  // 获得团购的最终价格
        $shop_price = $group_info['cur_price']+$total_attr_price;
        
        $res['result'] = price_format($shop_price * $number);
    }

    die($json->encode($res));
}
// 获取某个商品的扩展属性价格
function group_attr($goods_attr_id){
    $sql = 'select attr_price from '.$GLOBALS['ecs']->table('goods_attr').' where goods_attr_id='.$goods_attr_id;
    $result = $GLOBALS['db']->getOne($sql);
    return     floatval($result );
}

ecshop产品详情，默认改价

html

<script type="text/javascript">
var goods_id = {$goods_id};
var goodsattr_style = {$cfg.goodsattr_style|default:1};
var gmt_end_time = {$promote_end_time|default:0};
{foreach from=$lang.goods_js item=item key=key}
var {$key} = "{$item}";
{/foreach}
var goodsId = {$goods_id};
var now_time = {$now_time};

<!-- {literal} -->
onload = function(){
  changePrice();
  fixpng();
  try { onload_leftTime(); }
  catch (e) {}
}

/**
 * 点选可选属性或改变数量时修改商品价格的函数
 */
function changePrice()
{
  var attr = getSelectedAttributes(document.forms['ECS_FORMBUY']);
  var qty = document.forms['ECS_FORMBUY'].elements['number'].value;

  Ajax.call('goods.php', 'act=price&id=' + goodsId + '&attr=' + attr + '&number=' + qty, changePriceResponse, 'GET', 'JSON');
}

/**
 * 接收返回的信息
 */
function changePriceResponse(res)
{
  if (res.err_msg.length > 0)
  {
    alert(res.err_msg);
  }
  else
  {
    document.forms['ECS_FORMBUY'].elements['number'].value = res.qty;

    if (document.getElementById('ECS_GOODS_AMOUNT'))
      document.getElementById('ECS_GOODS_AMOUNT').innerHTML = res.result;
  }
}
<!-- {/literal} -->
/*新增 商品点击效果*/
function changeAtt(t,src,key) {
    //alert(key);
    document.getElementById('spec_value_'+src).checked='checked';
    div = document.getElementById("EXP_"+key);
    elems = div.getElementsByTagName("dl")[0].getElementsByTagName("a");
    for(i=0;i<elems.length;i++){
        elems[i].className='';    
    }
    t.className = "on";
    //elems[t].getElementsByTagName("span")[0].style.display="block";
    changePrice();
}

php代码

if (!empty($_REQUEST['act']) && $_REQUEST['act'] == 'price')
{
    include('includes/cls_json.php');

    $json   = new JSON;
    $res    = array('err_msg' => '', 'result' => '', 'qty' => 1);

    $attr_id    = isset($_REQUEST['attr']) ? explode(',', $_REQUEST['attr']) : array();
    $number     = (isset($_REQUEST['number'])) ? intval($_REQUEST['number']) : 1;

    if ($goods_id == 0)
    {
        $res['err_msg'] = $_LANG['err_change_attr'];
        $res['err_no']  = 1;
    }
    else
    {
        if ($number == 0)
        {
            $res['qty'] = $number = 1;
        }
        else
        {
            $res['qty'] = $number;
        }

        $shop_price  = get_final_price($goods_id, $number, true, $attr_id);
        $res['result'] = price_format($shop_price * $number);
    }

    die($json->encode($res));
}

总结：

1.要想点击价格有变动，ajax.all 必须得可以调取到值。

2.给一个团购的id，或者到参加团购商品的团购价格、或者属性

3.有了团购价格，再来获取点击扩展属性，获取扩展属性价格

4.团购价格、扩展属性价格都齐全了，利用ecshop本身的js功能function changePriceResponse 给某个id="ECS_GOODS_AMOUNT">{$group_buy.formated_cur_price}</div>值