控制ECSHOP的购买数量，在很多时候是必须的，而且当你有特别的需求的时候，控制数量显得格外重要。需要在goods表中增加个字段"gc"控制购买数量
首先，你需要在购买的时候，提示输入框,告诉用户,你必须购买多少.其次,购物车中需要修改购买数量的时候，你也需要控制。
1:详细页面中控制.
在flow.php里面addto_cart中,加入以下代码,控制购买.
$gc = $db -> getOne("select gc from ".$ecs->table('goods')." where goods_id = ".$goods ->goods_id);
if ($goods->number%$gc) {
$result['error'] = 1;
$result['message'] = "购买数量必须输入{$gc}的倍数";
}
2:在common.js中增加函数
function addToCart1(goodsId, parentId)
{
var goods = new Object();
var spec_arr = new Array();
var fittings_arr = new Array();
var number = 1;
var t = "number"+goodsId;
number = document.getElementById("number"+goodsId).value;
goods.spec = spec_arr;
goods.goods_id = goodsId;
goods.number = number;
goods.parent = (typeof(parentId) == "undefined") ? 0 : parseInt(parentId);
Ajax.call('flow.php?step=add_to_cart', 'goods=' + goods.toJS**tring(), addToCartResp**e, 'POST', 'JSON');
}
2:控制列表页面的购买.
在列表页面中，增加一个框.
<form action="javascript:addToCart1({$goods.goods_id})" method="post" name="ECS_FORMBUY{$goods.goods_id}" id="ECS_FORMBUY{$goods.goods_id}" >
购买数量：<input name="number{$goods.goods_id}" type="text" id="number{$goods.goods_id}" value="1" size="4" class="formBorder"/><br />
<a href="javascript:addToCart1({$goods.goods_id})"><img src="images/but_buy.jpg"></a>
<a href="javascript:;" id="compareLink"quotes"}','{$goods.type}')"><img src="images/but_comp.jpg"></a></form>
调用addToCart1函数.
3:推荐页面
在common.js中增加函数addToCart2
function addToCart2(goodsId, parentId)
{
var goods = new Object();
var spec_arr = new Array();
var fittings_arr = new Array();
var number = 1;
var t = "number"+goodsId;
number = document.getElementById("number_"+goodsId).value;
goods.spec = spec_arr;
goods.goods_id = goodsId;
goods.number = number;
goods.parent = (typeof(parentId) == "undefined") ? 0 : parseInt(parentId);
Ajax.call('flow.php?step=add_to_cart', 'goods=' + goods.toJS**tring(), addToCartResp**e, 'POST', 'JSON');
}
在recommend_new.lbi,recommend_best.lbi等页面中，需要增加输入框.调用次函数.
<form action="javascript:addToCart2({$goods.id})" method="post" name="ECS_FORMBUY_{$goods.id}" id="ECS_FORMBUY_{$goods.id}" >
购 买数量：<input name="number_{$goods.id}" type="text" id="number_{$goods.id}" value="1" size="4" class="formBorder"/><br /><a href="javascript:addToCart2({$goods.id})"><img src="images/but_buy.jpg"></a></form>
最后完成了购买数量的控制。
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