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。