別のドロップダウンリストの選択時にドロップダウンリストを入力してください

Question

私はMVCを使用していますが、私はMVCでまだ新しいです。あなたが他のドロップダウンリストの選択に関するデータをドロップダウンリストに記入できるかどうか誰にでも教えてください。

私はJqueryを使用してポストバックを回避し、ページをスムーズにしたいと考えています。

Answer 1

モデル：

namespace MvcApplicationrazor.Models 
{ 
    public class CountryModel 
    { 
     public List<State> StateModel { get; set; } 
     public SelectList FilteredCity { get; set; } 
    } 
    public class State 
    { 
     public int Id { get; set; } 
     public string StateName { get; set; } 
    } 
    public class City 
    { 
     public int Id { get; set; } 
     public int StateId { get; set; } 
     public string CityName { get; set; } 
    } 
} 

コントローラー：

public ActionResult Index() 
     { 
      CountryModel objcountrymodel = new CountryModel(); 
      objcountrymodel.StateModel = new List<State>(); 
      objcountrymodel.StateModel = GetAllState(); 
      return View(objcountrymodel); 
     } 


     //Action result for ajax call 
     [HttpPost] 
     public ActionResult GetCityByStaeId(int stateid) 
     { 
      List<City> objcity = new List<City>(); 
      objcity = GetAllCity().Where(m => m.StateId == stateid).ToList(); 
      SelectList obgcity = new SelectList(objcity, "Id", "CityName", 0); 
      return Json(obgcity); 
     } 
     // Collection for state 
     public List<State> GetAllState() 
     { 
      List<State> objstate = new List<State>(); 
      objstate.Add(new State { Id = 0, StateName = "Select State" }); 
      objstate.Add(new State { Id = 1, StateName = "State 1" }); 
      objstate.Add(new State { Id = 2, StateName = "State 2" }); 
      objstate.Add(new State { Id = 3, StateName = "State 3" }); 
      objstate.Add(new State { Id = 4, StateName = "State 4" }); 
      return objstate; 
     } 
     //collection for city 
     public List<City> GetAllCity() 
     { 
      List<City> objcity = new List<City>(); 
      objcity.Add(new City { Id = 1, StateId = 1, CityName = "City1-1" }); 
      objcity.Add(new City { Id = 2, StateId = 2, CityName = "City2-1" }); 
      objcity.Add(new City { Id = 3, StateId = 4, CityName = "City4-1" }); 
      objcity.Add(new City { Id = 4, StateId = 1, CityName = "City1-2" }); 
      objcity.Add(new City { Id = 5, StateId = 1, CityName = "City1-3" }); 
      objcity.Add(new City { Id = 6, StateId = 4, CityName = "City4-2" }); 
      return objcity; 
     } 

ビュー：

@model MvcApplicationrazor.Models.CountryModel 
@{ 
    ViewBag.Title = "Index"; 
    Layout = "~/Views/Shared/_Layout.cshtml"; 
} 

<script src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8/jquery-ui.min.js"></script> 
<script language="javascript" type="text/javascript"> 
    function GetCity(_stateId) { 
     var procemessage = "<option value='0'> Please wait...</option>"; 
     $("#ddlcity").html(procemessage).show(); 
     var url = "/Test/GetCityByStaeId/"; 

     $.ajax({ 
      url: url, 
      data: { stateid: _stateId }, 
      cache: false, 
      type: "POST", 
      success: function (data) { 
       var markup = "<option value='0'>Select City</option>"; 
       for (var x = 0; x < data.length; x++) { 
        markup += "<option value=" + data[x].Value + ">" + data[x].Text + "</option>"; 
       } 
       $("#ddlcity").html(markup).show(); 
      }, 
      error: function (reponse) { 
       alert("error : " + reponse); 
      } 
     }); 

    } 
</script> 
<h4> 
MVC Cascading Dropdown List Using Jquery</h4> 
@using (Html.BeginForm()) 
{ 
    @Html.DropDownListFor(m => m.StateModel, new SelectList(Model.StateModel, "Id", "StateName"), new { @id = "ddlstate", @style = "width:200px;", @onchange = "javascript:GetCity(this.value);" }) 
    <br /> 
    <br /> 
    <select id="ddlcity" name="ddlcity" style="width: 200px"> 

    </select> 

    <br /><br /> 
    }