如何在编辑页面MVC中重新绑定drowdownlist？ [英] How can I rebind the drowdownlist in edit page MVC?

问题描述

我正在研究MVC 5，我有Viewmodel Class'PartnersVM'。

I am working on MVC 5, there I have Viewmodel Class ' PartnersVM '.

public class PartnersVM  
   {  
       public List<CountryVM> listCountry { get; set; }  
       public PartnerVM listPartnerVM { get; set; }  
   }   
  
public class CountryVM  
   {  
       public int idCountry { get; set; }  
       public string countries_name { get; set; }  
   }  
  
public class PartnerVM  
   {  
     public string ServiceDistricts { get; set; }  
     public string ServiceStates { get; set; }  
    }  

我尝试过：



这是ActionResult Get方法。

What I have tried:

And this is ActionResult Get method.

[HttpGet]  
public ActionResult PremiumUserRegistration()  
       {  
         PartnersVM objcountrymodel = new PartnersVM();  
          objcountrymodel.listCountry = new List<CountryVM>();  
                       objcountrymodel.listCountry = objPartnerBIL.ShowCountries().Select(item => new CountryVM  
                       {  
                           idCountry = item.idCountry,  
                           countries_name = item.countries_name  
                       }).ToList();  
return View("PremiumUserRegistration", objcountrymodel);                      
        }  

调用此actionresult后现在绑定国家/地区列表。还有下拉的onchage调用jscript函数进行绑定下面的下拉菜单。



查看：

After calling this actionresult now binding list of countries. And the dropdown onchage calling a jscript function for bind below dropdowns also.

View:

@Html.DropDownListFor(model => model.listCountry, new SelectList(Model.listCountry, "idCountry", "countries_name"), "Select", new { @class = "form-control ", @id = "ddlcountries", @onchange = "return getuserstate.search(this.value)" })  
  
  
@Html.DropDownListFor(model => model.listPartnerVM.ServiceStates, Enumerable.Empty<SelectListItem>(), "Select Country", new { @id = "ddlstate", @class = "form-control ", @onchange = "return getdistricts.search(this.value)" })  
  
  
@Html.DropDownListFor(model => model.listPartnerVM.ServiceDistricts, Enumerable.Empty<SelectListItem>(), "Select State", new { @id = "ddlDistrict", @class = "form-control " })

这里得到那些drowdown的值，同时去编辑Get action方法如下图所示。



[ ^ ]



现在，一切正常。但问题是，我在移动编辑页面时无法重新绑定那些drowdown列表。这里添加/编辑页面是一个。如何重新绑定下拉列表？



请帮助我...

Here getting those drowdown's value while going to edit Get action method as show below image.

[^]

Now, all are working fine. But the problem is, I can not rebind those drowdown list while moving on edit page. Here Add/Edit page is one. How can I rebind the dropdownlist?

Please help me...

推荐答案

此Google搜索： mvc刷新下拉列表ajax - Google搜索 [ ^ ]



发现以下内容： c＃ - 使用AJAX MVC 4填充DropDownList - Stack Overflow [ ^ ]

This Google Search: mvc refresh dropdown list ajax - Google Search[^]

Found the following: c# - Populate DropDownList using AJAX MVC 4 - Stack Overflow[^]

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