ecshop团购点击价格变动的实现方法

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.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.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

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