Set selected value of SelectList Item if only exist in another list<int> variable RSS

• • Reply
  polachan

  Member

  411 Points

  1327 Posts

  Set selected value of SelectList Item if only exist in another list<int> variable

  Jan 17, 2021 11:33 PM|polachan|LINK

  Hi

  I am trying to set some values to have selected  as default  in a  multiple selectlist. Here is my code.

  my Repository 

   public IEnumerable<SelectListItem> GetLocations(int depotNo)
          {
  
              List<SelectListItem> locations = (from dpt in ctx.Department                                           
                                                select new SelectListItem
                                                {
                                                    Value = dpt.DepartmentID.ToString(),
                                                    Text = dpt.DepartmentName,
                                                    Selected = user.DepotNo == depotNo 
                                                }).ToList<SelectListItem>();
              locations.Insert(0, new SelectListItem
              {
                  Value = "0",
                  Text = "-- Select --"
              });
              return locations;

  view

  <div class="form-group">
       <label class="control-label control-label-left col-sm-3 text-danger" for="field2">Department*</label>
       <div class="controls col-sm-9">
            <select id="dropdownDepartment" class="form-control" multiple asp-for="Department" 
  		  asp-items="@ViewBag.UserDepartments" data-role="select">
            </select><span id="errId2" class="error"></span>
       </div>
  </div>

   Controller

  List<int> numbers = new List<int> 
  numbers.Add(30);  
  numbers.Add(35);  
  numbers.Add(40);
  List<SelectListItem> dept = new List<SelectListItem>();
  dept =  ctx.UserDepartmentLink.GetLocations(depotno).ToList();
  Here also I have to add more selected value for dropdownDepartment if there is any dept value  exist from numbers list int variable
  ViewBag.UserDepartments = dept;
  How can I add as selected item if there is any value hold as same value in number list int  variable
  
  

  With Thanks

  Pol

• • Reply
  mgebhard

  All-Star

  53041 Points

  23612 Posts

  Re: Set selected value of SelectList Item if only exist in another list<int> variable

  Jan 18, 2021 01:24 AM|mgebhard|LINK

  You did not share where "depotNo" is set.

• • Reply
  SurferOnWww

  Member

  330 Points

  235 Posts

  Re: Set selected value of SelectList Item if only exist in another list<int> variable

  Jan 18, 2021 03:20 AM|SurferOnWww|LINK

  polachan

  I am trying to set some values to have selected  as default  in a  multiple selectlist. Here is my code.

  See my reply in another thread you posted:

  https://forums.asp.net/t/2173715.aspx?Get+Selected+Value+from+the+multiple+SelectList+from+the+view+in+to+the+Controller

• • Reply
  YihuiSun

  Contributor

  2730 Points

  778 Posts

  Re: Set selected value of SelectList Item if only exist in another list<int> variable

  Jan 19, 2021 08:33 AM|YihuiSun|LINK

  Hi polachan, 

  You can use MultiSelectList and set the fourth parameter. I wrote an example, you can refer to it.

  Model

      public class TestMultiSelectListViewModel
      {
          public string Department { get; set; }
      }
      public class Department
      {
          [Key]
          public int DepartmentID { get; set; }
          public string DepartmentName { get; set; }
      }

  Controller

  public IActionResult Index()
  {
      List<int> numbers = new List<int>();
      numbers.Add(1);
      numbers.Add(5);
      numbers.Add(3);
      MultiSelectList test = new MultiSelectList(db.Departments.ToList(),"DepartmentID", "DepartmentName",numbers);
      ViewBag.UserDepartments = test;
      return View();
  }

  View

  @model DailyCoreMVCDemo.Models.TestMultiSelectListViewModel
  <select asp-for="Department" asp-items="@ViewBag.UserDepartments" size="3" multiple class="form-control"></select>

  Here is the result. 

  

  Best Regards,

  YihuiSun

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