转自：

二级联动：

View： 

<script type=

"text/javascript"

>    

    

$(function () {       

        

$(

"#drpProvince"

).change(function () { 

            

$(

"#drpCity"

).

get

(0).options.length = 0; 

//清空

            

$.getJSON(

"/Persons/GetCities/" 

+ $(

this

).val(), 

null 

, function (data) {

                

$.each(data, function (i, item) {

                    

$(

"<option></option>"

).val(item[

"ID"

]).text(item[

"CityName"

]).appendTo($(

"#drpCity"

));

                

});

            

});

        

});

    

});

</script>

 

@Html.DropDownList(

"drpProvince"

,

null

,

"请选择"

)

@Html.DropDownList(

"drpCity"

, 

null

,

"请选择"

)

 

Action：

 

          

public 

ActionResult Create()

        

{ 

            

List<Provinces> list = db.Provices.ToList();

            

ViewData[

"drpProvince"

] = 

new 

SelectList(list, 

"ID"

, 

"ProvinceName"

);

            

ViewData[

"drpCity"

] = 

new 

List<SelectListItem>();

            

return 

View();

        

}

 

        

//返回城市列表

        

public 

ActionResult GetCities(

int

? id)

        

{

            

List<Cities> list = db.Cities.Where(q => q.ProvincesID == id).ToList();

            

if 

(Request.IsAjaxRequest())

            

{

                

return 

Json(list, JsonRequestBehavior.AllowGet);

            

}

            

else

            

{

                

return 

View(

""

);

            

}

        

}