ecshop后台自定义价格区间的实现方法

ALTER TABLE `ecs_category` ADD `grade_define` VARCHAR( 255 ) NOT NULL AFTER `grade`

<tr>
<td class="label"><a href="javascript:showNotice('noticeGrade');" title="{$lang.form_notice}"><img src="images/notice.gif" width="16" height="16" border="0" alt="{$lang.notice_style}"></a>{$lang.grade}:</td>
<td>
<input type="text" name="grade" value="{$cat_info.grade|default:0}" size="40" /> <br />
<span class="notice-span" {if $help_open}style="display:block" {else} style="display:none" {/if} id="noticeGrade">{$lang.notice_grade}</span>
</td>
</tr>

<tr>
<td class="label">自定义价格区间:</td>
<td>
<input type="text" name="grade_define" value="{$cat_info.grade_define}" size="60" /> <br />
<span class="notice-span" {if $help_open}style="display:block" {else} style="display:none" {/if} id="noticeGrade">以 半角 , 间隔，如： 1-30,31-200,201-1000,1001-5000,5000以上</span>
</td>
</tr>

$cat['grade']= !empty($_POST['grade'])? intval($_POST['grade']): 0;

$cat['grade_define']= !empty($_POST['grade_define']) ? trim($_POST['grade_define']): '';//自定义价格区间 by zhangyh

if ($cat['grade'] == 0&& $cat['parent_id'] != 0)
{
$cat['grade'] = get_parent_grade($cat_id); //如果当前分类级别为空，取最近的上级分类
}
if ($cat['grade'] > 1)
{
$sql = "SELECT min(g.shop_price) AS min, max(g.shop_price) as max ".
 " FROM " . $ecs->table('goods'). " AS g ".
 " WHERE ($children OR " . get_extension_goods($children) . ') AND g.is_delete = 0 AND g.is_on_sale = 1 AND g.is_alone_sale = 1';
 //获得当前分类下商品价格的很大值、很小值
$row = $db->getRow($sql);
// 取得价格分级很小单位级数，比如，千元商品很小以100为级数
$price_grade = 0.0001;
for($i=-2; $i<= log10($row['max']); $i++)
{
$price_grade *= 10;
}
//跨度
$dx = ceil(($row['max'] - $row['min']) / ($cat['grade']) / $price_grade) * $price_grade;
if($dx == 0)
{
$dx = $price_grade;
}
for($i = 1; $row['min'] > $dx * $i; $i ++);
for($j = 1; $row['min'] > $dx * ($i-1) + $price_grade * $j; $j++);
$row['min'] = $dx * ($i-1) + $price_grade * ($j - 1);
for(; $row['max'] >= $dx * $i; $i ++);
$row['max'] = $dx * ($i) + $price_grade * ($j - 1);
$sql = "SELECT (FLOOR((g.shop_price - $row[min]) / $dx)) AS sn, COUNT(*) AS goods_num".
 " FROM " . $ecs->table('goods') . " AS g ".
 " WHERE ($children OR " . get_extension_goods($children) . ') AND g.is_delete = 0 AND g.is_on_sale = 1 AND g.is_alone_sale = 1 '.
 " GROUP BY sn ";
$price_grade = $db->getAll($sql);
foreach ($price_grade as $key=>$val)
{
$temp_key = $key + 1;
$price_grade[$temp_key]['goods_num'] = $val['goods_num'];
$price_grade[$temp_key]['start'] = $row['min'] + round($dx * $val['sn']);
$price_grade[$temp_key]['end'] = $row['min'] + round($dx * ($val['sn'] + 1));
$price_grade[$temp_key]['price_range'] = $price_grade[$temp_key]['start'] . '&nbsp;-&nbsp;' . $price_grade[$temp_key]['end'];
$price_grade[$temp_key]['formated_start'] = price_format($price_grade[$temp_key]['start']);
$price_grade[$temp_key]['formated_end'] = price_format($price_grade[$temp_key]['end']);
$price_grade[$temp_key]['url'] = build_uri('category', array('cid'=>$cat_id, 'bid'=>$brand, 'price_min'=>$price_grade[$temp_key]['start'], 'price_max'=> $price_grade[$temp_key]['end'], 'filter_attr'=>$filter_attr_str), $cat['cat_name']);
if (isset($_REQUEST['price_min']) && $price_grade[$temp_key]['start'] == $price_min && $price_grade[$temp_key]['end'] == $price_max)
{
$price_grade[$temp_key]['selected'] = 1;
}
else
{
$price_grade[$temp_key]['selected'] = 0;
}
}
$price_grade[0]['start'] = 0;
$price_grade[0]['end'] = 0;
$price_grade[0]['price_range'] = $_LANG['all_attribute'];
$price_grade[0]['url'] = build_uri('category', array('cid'=>$cat_id, 'bid'=>$brand, 'price_min'=>0, 'price_max'=> 0, 'filter_attr'=>$filter_attr_str), $cat['cat_name']);
$price_grade[0]['selected'] = empty($price_max) ? 1 : 0;
$smarty->assign('price_grade', $price_grade);
}

if($cat['grade_define'])
{
$price_grade=array();
$price_grade[0]['start'] = 0;
$price_grade[0]['end'] = 0;
$price_grade[0]['price_range'] = $_LANG['all_attribute'];
$price_grade[0]['url'] = build_uri('category', array('cid'=>$cat_id, 'bid'=>$brand,
'price_min'=>0, 'price_max'=> 0, 'filter_attr'=>$filter_attr_str), $cat['cat_name']);
$price_grade[0]['selected'] = empty($price_max) ? 1 : 0;
$grade_temp=explode(",", $cat['grade_define']);
foreach($grade_temp as $grade_temp_key=>$grade_temp_val)
{
$grade_temp_key2=$grade_temp_key+1;
$grade_temp=explode("-", $grade_temp_val);
$price_grade[$grade_temp_key2]['start']=intval($grade_temp[0]);
$price_grade[$grade_temp_key2]['end']=$grade_temp[1] ?
 intval($grade_temp[1]) : "999999999";
$price_grade[$grade_temp_key2]['price_range'] = $grade_temp_val;
$price_grade[$grade_temp_key2]['url'] = build_uri('category', array('cid'=>$cat_id,
'bid'=>$brand, 'price_min'=>$price_grade[$grade_temp_key2]['start'],
'price_max'=> $price_grade[$grade_temp_key2]['end'],
'filter_attr'=>$filter_attr_str), $cat['cat_name']);
if (isset($_REQUEST['price_min'])
&& $price_grade[$grade_temp_key2]['start'] == $price_min
&& $price_grade[$grade_temp_key2]['end'] == $price_max)
{
$price_grade[$grade_temp_key2]['selected'] = 1;
}
else
{
$price_grade[$grade_temp_key2]['selected'] = 0;
}
}
$smarty->assign('price_grade', $price_grade);
}

return $GLOBALS['db']->getRow('SELECT cat_name, keywords, cat_desc, style, grade, filter_attr, parent_id FROM ' . $GLOBALS['ecs']->table('category') .
" WHERE cat_id = '$cat_id'");

return $GLOBALS['db']->getRow('SELECT cat_name, keywords, cat_desc, style, grade, grade_define, filter_attr, parent_id FROM ' . $GLOBALS['ecs']->table('category') .
" WHERE cat_id = '$cat_id'");