jquery ajax实现下拉框三级无刷新联动,且保存保持(2)

    //如果区名没有填充数据，城市有选择数据则加载数据
    if ($("select[id$=ddlAreaName] > option").length == 1 && $ddlcity.val() != "-1") {
        loadWater($ddlcity.val(), "SelectAreaName");
        //读cookie,有值则设为选中状态
        var areaname = readCookie("JQ_AreaName");
        if (areaname != null && areaname != "undefined" && areaname != "") {

            $("select[id=ddlAreaName] > option[value='" + areaname + "']").attr("selected", "true");

}
    }

$ddlarea.bind("change keyup", function() {
        if ($(this).val() != "-1") {
            //选中值存cookie
            writeCookie("JQ_AreaName", $(this).val(), 0.5, true);
        }

});
});

function loadWater(selectedItem, typename) {
    $.ajax({
        type: "GET",
        url: "/GetWaterxiname.ashx",
        data: { usetype: typename, id: selectedItem },
        contentType: "application/json; charset=utf-8",
        dataType: "json",
        async: false,
        success: function Success(data) {
            bindWater(data, typename);
        }
    });
}

function bindWater(data, typename) {

if (typename == "SelectCity") {    //绑定城市

$("select[name$=ddlCity] > option").remove(); //删除原有的option
        $("select[id$=ddlCity]").append($("<option></option>").val("-1").html("--请选择--"));

        for (var i = 0; i < data.length; i++) {
            $("select[id$=ddlCity]").append($("<option></option>").val(data[i].City).html(data[i].City));
        }
    }
    else if (typename == "SelectAreaName") {

$("select[name$=ddlAreaName] > option").remove(); //删除原有的option
        $("select[id$=ddlAreaName]").append($("<option></option>").val("-1").html("--请选择--"));

        for (var i = 0; i < data.length; i++) {
            $("select[id$=ddlAreaName]").append($("<option></option>").val(data[i].AreaName).html(data[i].AreaName));
        }
    }
}

说明:省份数据在页面加载时绑定，页面提交后 省份值可以用 selectvalue取，市，区选中数据要用 Request["idname"] 获取

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