Set dropdownlist value selected during Edit in ASP.NET MVC

Question

I am using Visual Studio 2013 and creating MVC application and I have bind dropdownlist like this:

var list = context.Roles.OrderBy(r => r.Name).ToList()
    .Select(rr => new SelectListItem { Value = rr.Name.ToString(), Text = rr.Name })
    .ToList();  
ViewBag.Roles = list;

and in CSHTML:

@Html.DropDownList("Role", (IEnumerable<SelectListItem>)ViewBag.Roles, "Select ...")

Now I want set selected value in Edit time!

What should I do to select that coming id or name in dropdownlist please help me to do this?

Thanks in advance.

You need to set the value of the `Role` property of your model in the GET method before you pass the model to the view (also recommend you use the strongly typed `@Html.DropDownListFor(m => m.Role, ....)` method — , Jun 13 '16 at 07:10
@StephenMuecke you mean to say like this @Html.DropDownlistFor(m => m.Role,"Role",(IEnumerable)ViewBag.Roles, "Select ...") right? — 3 rules, Jun 13 '16 at 07:11
Your binding to a property named `Role`, so you need to set the value of `Role` to match one of the values in your `SelectList` (and you really should be using a view model that contains a property `IEnumerable` in addition to your `string Role` property rather than `ViewBag` — , Jun 13 '16 at 07:14
Ok but I am passing the Role with model inside Employee like Role inside the Employee so do I need to create SelectList of Role inside Employee cs file and bind that select list? — 3 rules, Jun 13 '16 at 07:17
`Employee` is a data model, so no. You should be using a view model that contains the properties your editing plus the property for the `SelectList` - [What is ViewModel in MVC?](http://stackoverflow.com/questions/11064316/what-is-viewmodel-in-mvc) — , Jun 13 '16 at 07:19
And its `@Html.DropDownListFor(m => m.Role, (IEnumerable)ViewBag.Roles, "Select ...")` or better (if your using a view model) `@Html.DropDownListFor(m => m.Role, Model.Roles, "Select ...")` — , Jun 13 '16 at 07:21

score 1 · Answer 1 · answered Jun 13 '16 at 07:51

I am using code like this:

foreach (var c in _countryService.GetAllCountries(true))
   model.AvailableCountries.Add(new SelectListItem { Text = c.Name, Value = c.Id.ToString(), Selected = (c.Id == model.CountryId) });

model.CountryId ====> get edit item id

Working principle this episode:

Selected = (c.Id == model.CountryId)

3 rules · Accepted Answer · 2016-06-14T07:25:37.520

0

I have done it like this and it's running:

In Back End Code:

var roles = db.RoleTables.ToList();
emp.Role = GetSelectListItems(roles);

private IEnumerable<SelectListItem> GetSelectListItems(IEnumerable<RoleTable> elements)
        {
            foreach (var element in elements)
            {
                selectList.Add(new SelectListItem
                {
                    Value = element.Id,
                    Text = element.Name
                });
            }

            return selectList;
        }

In CSHTML:

@Html.DropDownListFor(model => model.SelectedRole, Model.Role, "Select ...")

Edit time:

var roles = db.RoleTables.ToList();
empreg.Role = GetSelectListItems(roles);
empreg.SelectedRole = db.RoleTable.Where(re => re.Name == employee.Role).Select(r => r.Id).FirstOrDefault();

Thanks to the following post and to those who has responded me: http://nimblegecko.com/using-simple-drop-down-lists-in-ASP-NET-MVC/

edited Jun 14 '16 at 07:25

answered Jun 13 '16 at 09:12

3 rules

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You `foreach` loop in the `Edit` is pointless and can be removed. Its the value of `SelectedRole` that determines what is selected and the `DropDownListFor()` method builds its own `SelectList` and ignores the `Selected` property of your `SelectListItem`'s – Jun 13 '16 at 12:13
I have to set selected when I am going to edit something that is why I have use that. – 3 rules Jun 13 '16 at 12:37
1

No you don't. It already selected (internally the `DropDownListFor()` builds a new `SelectList`. Just delete the `foreach` loop and you will still see that its selected :) (the code in your Edit time block is pointless and does nothing. – Jun 13 '16 at 12:43
No dear as per I am testing it is not set I have to do above code for that. – 3 rules Jun 13 '16 at 12:45
1

Then your doing something else wrong. Your code is utterly pointless! – Jun 13 '16 at 12:48
1

And all it needs to be is `emp.Role = roles.Select(x => new SelectListItem { Value = x.Id.ToString(), Text = x.Name });` or `emp.Role = new SelectList(roles, "Id", "Name");` – Jun 13 '16 at 12:53
Ohhh awesome I just need to do some practice on better coding thanks for suggest dear sir and yes I know it must select value on SelectedRole but it is not done so where I am going wrong sir! – 3 rules Jun 13 '16 at 13:02
1

Let us [continue this discussion in chat](http://chat.stackoverflow.com/rooms/114530/discussion-between-stephen-muecke-and-padhiyar). – Jun 13 '16 at 13:06

Set dropdownlist value selected during Edit in ASP.NET MVC

2 Answers2