javascript的疑惑,绑定select控件的问题

Question

javascript的疑惑，请见代码，在注释处，如果我alert就可以给街区(sltDistrict ) 设置我要设置的值，但是如果我不alert就不会设置上，请问是什么原因，谢谢。var province = $("#Province").val();
            var city = $("#City").val();
            var district = $("#District").val();
            
            var c = $("#sltProvince option").length;
            for(var i = 0 ; i<c;i++)
            {
                if($("#sltProvince").get(0).options[i].text == province)
                {
                    $("#sltProvince").get(0).options[i].selected = true;
                    GetCityList($("#sltProvince").get(0).options[i].value);
                    break;
                }
            }
            
            c = $("#sltCity option").length;
            for(var i = 0 ; i<c;i++)
            {
                if($("#sltCity").get(0).options[i].text == city)
                {
                    $("#sltCity").get(0).options[i].selected = true;
                    GetDistrictList($("#sltCity").get(0).options[i].value);
                    break;
                }
            }
            alert("ss");//这里如果不alert，sltDistrict 选中不了我要设置的值，如果alert就可以绑定上值了。
            c = $("#sltDistrict option").length;
            for(var i = 0 ; i<c;i++)
            {
                if($("#sltDistrict").get(0).options[i].text == district)
                {
                    $("#sltDistrict").get(0).options[i].selected = true;
                    break;
                }
            }

Answer 1

跟alert无关，建议楼主好好检查代码

Answer 2

楼主是不是用到ajax 而且是异步的,如果是的话,改用同步的.

Answer 3

嗯 应该是AJAX异步调用的问题，我把读取城区的方法集成到读取城市的方法里，
在加载完城市后再读取城区就好了，谢谢

Answer 4

function GetCityList(e) {
        $.get("/ajax/GetCityList?province=" + e, function(data) {
            $("#sltCity").empty();
            $("#sltCity").append(data);
            
            var city = $("#City").val();
            if(city != "")
            {
                var c = $("#sltCity option").length;
                for(var i = 0 ; i<c;i++)
                {
                    if($("#sltCity").get(0).options[i].text == city)
                    {
                        $("#sltCity").get(0).options[i].selected = true;
                        GetDistrictList($("#sltCity").get(0).options[i].value);
                        break;
                    }
                }
            }            var province = $("#sltProvince").val();
            var city = $("#sltCity").val();
            $.get("/ajax/GetDistrictList?province=" + province + "&city=" + city, function(data) {
                $("#sltDistrict").empty();
                $("#sltDistrict").append(data);
                
                var district = $("#District").val();
                if(district!="")
                {
                    var c = $("#sltDistrict option").length;
                    for(var i = 0 ; i<c;i++)
                    {
                        if($("#sltDistrict").get(0).options[i].text == district)
                        {
                            $("#sltDistrict").get(0).options[i].selected = true;
                            break;
                        }
                    }
                }
            })
        })
    }