/* $Id : region.js 4865 2007-01-31 14:04:10Z paulgao $ */

var region = new Object();

region.isAdmin = false;

region.loadRegions = function(parent, type, target) {
    $.ajax({
        type: "GET",
        url: region.getFileName(),
        data: 'type=' + type + '&target=' + target + "&parent=" + parent,
        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) {
    result = eval("(" + result + ")");
    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() {
    return "/tools/region.aspx";
}