Chosen三级联动

上一篇介绍了  Chosen 的使用，这篇介绍联动。看代码：

var addressResolve = function (options) {
    //检测用户传进来的参数是否合法
    if (!isValid(options))
        return this;

    //默认参数
    var defaluts = {
        proId: 'divProv',
        cityId: 'divCity',
        areaId: 'divArea'
    };

    var opts = $j.extend({}, defaluts, options);//使用jQuery.extend 覆盖插件默认参数

    var addressInfo = this;
    this.provInfo = $j("#" + opts.proId);//省份select对象
    this.cityInfo = $j("#" + opts.cityId);//城市select对象
    this.areaInfo = $j("#" + opts.areaId);//区县select对象

    /*省份初始化方法*/
    this.provInfoInit = function () {
        var proOpts = "";
        $j.each(provinceJson, function (index, item) {
            proOpts += "<option value='" + item.ProID + "'>" + item.name + "</option>";
        });
        addressInfo.provInfo.append(proOpts);

        addressInfo.provInfo.chosen(); //初始化chosen
        addressInfo.cityInfo.chosen();//初始化chosen
        addressInfo.areaInfo.chosen();//初始化chosen
    };

    /*城市选择绑定方法*/
    this.selectCity = function () {
        addressInfo.cityInfo.empty();
        addressInfo.cityInfo.append("<option value=选择城市>选择城市</option>");
        addressInfo.areaInfo.empty();
        addressInfo.areaInfo.append("<option value=选择区县>选择区县</option>");
        if (addressInfo.provInfo.val() == "选择省份") { //选择无效时直接返回
            addressInfo.cityInfo.trigger("liszt:updated");
            addressInfo.areaInfo.trigger("liszt:updated");
            return;
        }
        var provId = addressInfo.provInfo.val();//获取选择的省份值
        var cityOpts = "";
        $j.each(cityJson, function (index, item) {
            if (item.ProID == provId) {
                cityOpts += "<option value='" + item.CityID + "'>" + item.name + "</option>";
            }
        });
        addressInfo.cityInfo.append(cityOpts);
        addressInfo.cityInfo.trigger("liszt:updated");
        addressInfo.areaInfo.trigger("liszt:updated");
    };

    /*区县选择绑定方法*/
    this.selectArea = function () {
        if (addressInfo.cityInfo.val() == "选择城市") return;
        addressInfo.areaInfo.empty();
        addressInfo.areaInfo.append("<option value=选择区县>选择区县</option>");
        var cityId = addressInfo.cityInfo.val();//获取选择的城市值
        var areaOpts = "";
        $j.each(areaJson, function (index, item) {
            if (item.CityID == cityId) {
                areaOpts += "<option value='" + item.Id + "'>" + item.DisName + "</option>";
            }
        });
        addressInfo.areaInfo.append(areaOpts);
        addressInfo.areaInfo.trigger("liszt:updated");
    };

    /*对象初始化方法*/
    this.init = function () {
        addressInfo.provInfo.append("<option value=选择省份>选择省份</option>");
        addressInfo.cityInfo.append("<option value=选择城市>选择城市</option>");
        addressInfo.areaInfo.append("<option value=选择区县>选择区县</option>");

        addressInfo.provInfoInit();
        addressInfo.provInfo.bind("change", addressInfo.selectCity);
        addressInfo.cityInfo.bind("change", addressInfo.selectArea);
    }

    //私有方法，检测参数是否合法
    function isValid(options) {
        return !options || (options && typeof options === "object") ? true : false;
    }
}