/* $Id: region.js 2008-08-08 00:02:23 wenrui $ */

var region = new Object();
region.isAdmin = false;

region.loadRegions = function(parent, type, target)
{
	
	//Ajax.call(region.getFileName(), 'type=' + type + '&target=' + target + '&parent=' + parent, region.response, 'GET', 'JSON');
	var u = region.getFileName();
	var args = 'type=' + type + '&target=' + target + '&parent=' + parent;
	$.ajax({
		 type: "GET",
		 url: u,
		 data:args,
		 dataType: "json",
		 success: region.response
	});
}

/* *
 * 载入指定的国家下所有的省份
 * @country integer 国家的编号
 * @selname string	列表框的名称
*/
region.loadProvinces = function(country, selName)
{
	var objName = (typeof selName == 'undefined') ? 'selProvinces' : selName;
	
	region.loadRegions(country, 1, objName);
}

/* *
 * 载入指定的省份下所有的城市
 *
 * @province    integer 省份的编号
 * @selName     string  列表框的名称
 */
region.loadCities = function(province, selName)
{
	var objName = (typeof selName == 'undefined') ? 'selCities' : selName;
	
	region.loadRegions(province, 2, objName);
}

/* *
 * 载入指定的城市下的区 / 县
 *
 * @city    integer     城市的编号
 * @selName string      列表框的名称
 */
region.loadDistricts = function(city, selName)
{
  var objName = (typeof selName == "undefined") ? "selDistricts" : selName;

  region.loadRegions(city, 3, objName);
}

/* *
 * 处理下拉列表改变的函数
 *
 * @obj     object  下拉列表
 * @type    integer 类型
 * @selName string  目标列表框的名称
 */
region.changed = function (obj, type, selName)
{
	var parent = obj.options[obj.selectedIndex].value;
	
	region.loadRegions(parent, type, selName);
}


region.response = function (result, text_result)
{
	
	var result = result.content;
	var sel = document.getElementById(result.target);
	
	sel.length = 1;
	sel.selectedIndex = 0;
	sel.style.display = (result.regions.length == 0 && ! region.isAdmin && result.type + 0 == 3) ? 'none' : '';
	
	if (document.all)
	{
		sel.fireEvent('onchange');
	}
	else
	{
		var evt = document.createEvent('HTMLEvents');
		evt.initEvent('change', true, true);
		sel.dispatchEvent(evt);
	}
	
	if (result.regions)
	{
		for( i = 0; i<result.regions.length; i++)
		{
			var opt = document.createElement('OPTION');
			opt.value = result.regions[i].region_id;
			opt.text = result.regions[i].region_name;
			
			sel.options.add(opt);
		}
	}
}


region.getFileName = function()
{
	/*
	if (region.isAdmin)
	{
		return '/js/region.php';
	}
	else
	{
		return '/js/region.php';
	}
	*/
	return '/js/region.php';
}