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How to validate that a dropdown list item has been selected

By : aming
Date : October 16 2020, 11:12 PM
hop of those help? Well, this must be easy, but ...
code :

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Need to change selected item in dropdown list when selected item in another dropdown list changes

By : Ritoban Richard Paul
Date : March 29 2020, 07:55 AM
Any of those help Adding values to cbxUpdateAppType from the AppTable object fixed it. I'm not sure why since in either case, I was adding Strings.
I just needed to check for duplicates so I don't end up with multiple instances of the same value in my dropdown box.
code :
foreach (AppTable table in appTableList)
            if (!cbxUpdateAppType.Items.Contains(table.Type))

Showing values in second dropdown list corresponding to first dropdown list selected item

By : user3360737
Date : March 29 2020, 07:55 AM
I wish this help you You could create an action that accepts a ReportElem.Alusdok value and returns a JSON list of ParingElem objects.
code :
public ActionResult GetParingElems(string parentAlusdok)
    // construct a list formatted like this from your data layer, etc
    List<ListItem> list = new List<ListItem>() {
        new ListItem() { Value = "1", Text = "Alusdok 1" },
        new ListItem() { Value = "2", Text = "Alusdok 2" },
        new ListItem() { Value = "3", Text = "Alusdok 3" }

    return Json(list);
$('#_Report').change(function() {
        url: 'GetParingElems',
        type: 'POST',
        data: { parentAlusdok: $('#_Report').val() },
        dataType: 'json',
        success: function(data) { // this is the returned JSON list
            // iterate over data
            // i and optionData are arbitrary variable names
            $.each(data, function (i, optionData) {

Using MVC dropdown list how to edit form and show the data in dropdown and previously selected item in dropdown?

By : user3295214
Date : March 29 2020, 07:55 AM
I wish did fix the issue. I am using MVC4 and displaying categories in drop down list. Foam allow user to edit the previously added data. So when i perform update action all the other data that user enter can easily displayed but who to display the selected category value from drop down list and show that valve in drop down? , Your Model should contains CategoryId
code :
public int CategoryId{get;set;}
public ActionResult Edit(int id)
   using (var catRepo = new BusinessLayer.Repostories.CategoryRepository())
      var itemToEdit=catRep.GetItemById(id);// replace your method
      ViewBag.VBCategoryList = new  SelectList(catRepo.GetAllCategories(),"CategoryId","Name",itemToEdit.CategoryId);
   return View(itemEdit);

How to return text input value instead of dropdown list item when certain dropdown value is selected for model binding?

By : Dkdocs
Date : March 29 2020, 07:55 AM
it should still fix some issue Use a different name for the text input like OtherGenre and add a property with that name to your view model.
code :
<input id="OtherGenre" class="form-control" type="text" name="OtherGenre" />

public class MyViewModel
    public string Genre {get; set;}
    public string OtherGenre {get; set;}
//Either overwrite Genre before saving it
public ActionResult MyPostAction(MyViewModel model)
    if(model.Genre == "Other") model.Genre=model.OtherGenre;

    // ...save model ...

//Or apply that logic when displaying it
<span>@(@Model.Genre=="Other" ? Model.OtherGenre : Model.Genre)</span>

Validate dropdown item does not occur more than once in a list of dropdown fields with the same id

By : Rana Afifi
Date : March 29 2020, 07:55 AM
I wish did fix the issue. This is simply not possible using a ValidationAttribute (either in-built or custom ones) and MVC's unobtrusive client side validation.
Validation attributes are applied to properties of a model (your class), and the context in which validation is checked is for that instance only - it has no knowledge of other instances of the model within the collection, therefore it cannot compare other instances.
code :
<select class="select" .....>
    <option value="">Please select</option>
    <option value="1">On-call</option>
<div class="error"></div> // see notes below if you using ValidationMessageFor()
var errors = $('.error');
var selects = $('.select');
$('.select').change(function() {
  var selected = $.map(selects, function(s, i) {
    return $(s).val();
  $.each(selects, function(i, s) {
    var error = $(this).next('.error');
    var val = $(this).val();
    var index = i;
    if ($(this).val()) {
      var others = selected.filter(function(s, i) {
        if (i != index) {
          return s;
      if (others.indexOf(val) > -1) {
        error.text('Please make a unique selection');
      } else {
    } else {

var selected = new List<int>();
for (int i = 0 i < model.Count; i++)
    if (selected.Contains(model[i].YourProperty))
        ModelState.AddModelError("", "Please make a unique selection");
if (!ModelState.IsValid)
    return View(model);
if (model.Select(x => x.YourProperty).GroupBy(x => x).Any(g => g.Count() > 1))
    ModelState.AddModelError("", "Please make a unique selection");
if (selected.Contains(model[i].YourProperty))
    var propertyName = string.Format("[{0}].yourPropertyName", i);
    ModelState.AddModelError(propertyName, "Please make a unique selection");
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