I have editing form with dropdownlist. It's work properly but when I'm on a editin page, in dropdownlist I see first value from a list. I want make, I can see value which I have in database. ex. I have company: 1, 2, 3, 4, 5, and when I editing I have default company 1. But in databese for this product is company 4. Do if I will editin form in dropdownlist I would like have defoult showing company 4 instead 1.
I hope you understand what I have on the mind.
Controller:
[HttpGet]
public ActionResult edytuj_prod(int ID_Produkt)
{
var prod = (from d in baza.Produkts
join s in baza.Firmas on d.ID_firma equals s.ID_firma where ID_Produkt == d.ID_Produkt
select new { d.ID_firma, d.nazwa_prod, d.ilosc, d.jednostka, d.cena, d.ID_Produkt, s.nazwa }).First();
var firma = baza.Firmas;
produktModel pr = new produktModel()
{
firmaList = firma.AsEnumerable().Select(x => new SelectListItem
{
Value = x.ID_firma.ToString(),
Text = x.nazwa
})
};
pr.nazwa_prod = prod.nazwa_prod;
pr.ilosc = prod.ilosc;
pr.jednostka = prod.jednostka;
pr.cena = prod.cena;
return View(pr);
View:
<div class="editor-field">
#Html.DropDownListFor(x => x.ID_firma, Model.firmaList)
</div>
If I understood correctly, you want the dropdown list to have the saved item selected instead of having the first item on the list. If so, see this answer
Also you could check these constructors:
public SelectList(IEnumerable items, Object selectedValue)
public SelectList(IEnumerable items, string dataValueField, string dataTextField, Object selectedValue)
var dropdown = (from role in db.aspnet_Users
where role.aspnet_Roles.Any(a => a.RoleName == "supervisor")
select new
{
text = role.UserName,
value = role.UserId
}).ToList();
code to generate dropdown list having dropdown.text as DropdownList item/text and dropdown.value as DropdownList value
This code Present in my view.cshtml
using razor:
#Html.DropDownList("name",
new SelectList( dropdown ,
"value",
"text" ) )
where dropdown is your variable
Also considering moving your code to the controller and passing the variable through viewbag (ie: ViewBag.dropdownitems = dropdown)
Here is my model:
public class NewsCategoriesModel {
public int NewsCategoriesID { get; set; }
public string NewsCategoriesName { get; set; }
}
My controller:
public ActionResult NewsEdit(int ID, dms_New dsn) {
dsn = (from a in dc.dms_News where a.NewsID == ID select a).FirstOrDefault();
var categories = (from b in dc.dms_NewsCategories select b).ToList();
var selectedValue = dsn.NewsCategoriesID;
SelectList ListCategories = new SelectList(categories, "NewsCategoriesID", "NewsCategoriesName",selectedValue);
// ViewBag.NewsCategoriesID = new SelectList(categories as IEnumerable<dms_NewsCategory>, "NewsCategoriesID", "NewsCategoriesName", dsn.NewsCategoriesID);
ViewBag.NewsCategoriesID = ListCategories;
return View(dsn);
}
And then my view:
#Html.DropDownList("NewsCategoriesID", (SelectList)ViewBag.NewsCategoriesID)
When i run, the DropDownList does not select the value I set.. It is always selecting the first option.
You should use view models and forget about ViewBag Think of it as if it didn't exist. You will see how easier things will become. So define a view model:
public class MyViewModel
{
public int SelectedCategoryId { get; set; }
public IEnumerable<SelectListItem> Categories { get; set; }
}
and then populate this view model from the controller:
public ActionResult NewsEdit(int ID, dms_New dsn)
{
var dsn = (from a in dc.dms_News where a.NewsID == ID select a).FirstOrDefault();
var categories = (from b in dc.dms_NewsCategories select b).ToList();
var model = new MyViewModel
{
SelectedCategoryId = dsn.NewsCategoriesID,
Categories = categories.Select(x => new SelectListItem
{
Value = x.NewsCategoriesID.ToString(),
Text = x.NewsCategoriesName
})
};
return View(model);
}
and finally in your view use the strongly typed DropDownListFor helper:
#model MyViewModel
#Html.DropDownListFor(
x => x.SelectedCategoryId,
Model.Categories
)
just in case someone comes with this question, this is how I do it, please forget about the repository object, I'm using the Repository Pattern, you can use your object context to retrieve the entities. And also don't pay attention to my entity names, my entity type Action has nothing to do with an MVC Action.
Controller:
ViewBag.ActionStatusId = new SelectList(repository.GetAll<ActionStatus>(), "ActionStatusId", "Name", myAction.ActionStatusId);
Pay attention that the last variable of the SelectList constructor is the selected value (object selectedValue)
Then this is my view to render it:
<div class="editor-label">
#Html.LabelFor(model => model.ActionStatusId, "ActionStatus")
</div>
<div class="editor-field">
#Html.DropDownList("ActionStatusId")
#Html.ValidationMessageFor(model => model.ActionStatusId)
</div>
I think it is pretty simple, I hope this helps! :)
I drilled down the formation of the drop down list instead of using #Html.DropDownList(). This is useful if you have to set the value of the dropdown list at runtime in razor instead of controller:
<select id="NewsCategoriesID" name="NewsCategoriesID">
#foreach (SelectListItem option in ViewBag.NewsCategoriesID)
{
<option value="#option.Value" #(option.Value == ViewBag.ValueToSet ? "selected='selected'" : "")>#option.Text</option>
}
</select>
Well its very simple in controller you have somthing like this:
-- Controller
ViewBag.Profile_Id = new SelectList(db.Profiles, "Id", "Name", model.Profile_Id);
--View (Option A)
#Html.DropDownList("Profile_Id")
--View (Option B) --> Send a null value to the list
#Html.DropDownList("Profile_Id", null, "-- Choose --", new { #class = "input-large" })
Replace below line with new updated working code:
#Html.DropDownList("NewsCategoriesID", (SelectList)ViewBag.NewsCategoriesID)
Now Implement new updated working code:
#Html.DropDownListFor(model => model.NewsCategoriesID, ViewBag.NewsCategoriesID as List<SelectListItem>, new {name = "NewsCategoriesID", id = "NewsCategoriesID" })
I want to put the correct answer in here, just in case others are having this problem like I was. If you hate the ViewBag, fine don't use it, but the real problem with the code in the question is that the same name is being used for both the model property and the selectlist as was pointed out by #RickAndMSFT
Simply changing the name of the DropDownList control should resolve the issue, like so:
#Html.DropDownList("NewsCategoriesSelection", (SelectList)ViewBag.NewsCategoriesID)
It doesn't really have anything to do with using the ViewBag or not using the ViewBag as you can have a name collision with the control regardless.
I prefer the lambda form of the DropDownList helper - see MVC 3 Layout Page, Razor Template, and DropdownList
If you want to use the SelectList, then I think this bug report might assist - http://aspnet.codeplex.com/workitem/4932
code bellow, get from, goes
Controller:
int DefaultId = 1;
ViewBag.Person = db.XXXX
.ToList()
.Select(x => new SelectListItem {
Value = x.Id.ToString(),
Text = x.Name,
Selected = (x.Id == DefaultId)
});
View:
#Html.DropDownList("Person")
Note:
ViewBag.Person and #Html.DropDownList("Person") name should be as in view model
To have the IT department selected, when the departments are loaded from tblDepartment table, use the following overloaded constructor of SelectList class. Notice that we are passing a value of 1 for selectedValue parameter.
ViewBag.Departments = new SelectList(db.Departments, "Id", "Name", "1");
For anyone that dont want to or dont make sense to use dropdownlistfor, here is how I did it in jQuery with .NET MVC set up.
Front end Javascript -> getting data from model:
var settings = #Html.Raw(Json.Encode(Model.GlobalSetting.NotificationFrequencySettings));
SelectNotificationSettings(settings);
function SelectNotificationSettings(settings) {
$.each(settings, function (i, value) {
$("#" + value.NotificationItemTypeId + " option[value=" + value.NotificationFrequencyTypeId + "]").prop("selected", true);
});
}
In razor html, you going to have few dropdownlist
#Html.DropDownList(NotificationItemTypeEnum.GenerateSubscriptionNotification.ToString,
notificationFrequencyOptions, optionLabel:=DbRes.T("Default", "CommonLabels"),
htmlAttributes:=New With {.class = "form-control notification-item-type", .id = Convert.ToInt32(NotificationItemTypeEnum.GenerateSubscriptionNotification)})
And when page load, you js function is going to set the selected option based on value that's stored in #model.
Cheers.
I am having trouble getting my DropDownList to set the selected item to the value from the model.
The field in the model is just a string for the Title of the users name (Mr, Miss etc..) Below is my code so far.
<td>
#{ var list = new List<SelectListItem>(new[] {
new SelectListItem{ Selected = string.IsNullOrEmpty(Model.Title), Text="",Value=""},
new SelectListItem{ Selected = Model.Title.Equals("Mr"), Text="Mr",Value="Mr"},
new SelectListItem{ Selected = Model.Title.Equals("Mrs"), Text="Mrs",Value="Mrs"},
new SelectListItem{ Selected = Model.Title.Equals("Miss"), Text="Miss",Value="Miss"},
new SelectListItem{Selected = Model.Title.Equals("Ms"), Text="Ms",Value="Ms"}
});
}
#Html.DropDownListFor(m=>m.Title, list)
</td>
I had this problem with MVC 3 and it turned out that I had set ViewBag.Title on my View (using it for the page title). As soon as I changed it to ViewBag.PageTitle, the dropdownlist code started working : #Html.DropDownListFor(model => model.Title, Model.MySelectList)
The reason for this is that in MVC 2/3, any ViewBag / ViewData properties with the same name as those in the Model object get used in preference in DropDownListFor(), so you need to rename them to make sure they don't conflict. Because that seems really flaky, I just stopped using ViewBag entirely and now rely only on the View Model for passing stuff into the View.
The reason this problem is so prevalent is that ViewBag.Title is used in many introductory tutorials and demo code to set the HTML title element, and so inevitably gets adopted as a "best-practice" approach. However, Title is a natural Model property name for use in dropdowns on a "User Details" view.
So it turns out that the only reason it doesn't work is because my field name is Title, I changed it to Prefix and my exact code works. Way too much time spent finding that out...
Here is working code.
<td>
#{ var list = new List<SelectListItem>(new[] {
new SelectListItem {
Selected = string.IsNullOrEmpty(Model.Prefix),
Text="",
Value=""
},
new SelectListItem {
Selected = Model.Prefix.Equals("Mr"),
Text="Mr",
Value="Mr"
},
new SelectListItem {
Selected = Model.Prefix.Equals("Mrs"),
Text="Mrs",
Value="Mrs"
},
new SelectListItem {
Selected = Model.Prefix.Equals("Miss"),
Text="Miss",
Value="Miss"
},
new SelectListItem {
Selected = Model.Prefix.Equals("Ms"),
Text="Ms",
Value="Ms"
}
});
}
#Html.DropDownListFor(m => m.Prefix, list)
</td>
give me full demonstration of html.dropdownlist
how it is implimented?
how to set values in the list?
how to use it in .aspx and in controller file?
Ok, let me have a try
There is SelectList class that you can use to create a list in the controller class (in the approriate controller action) as follows:
var items = new KeyValueList();
var item = new KeyValue() {Key = 1, Value = "Orange" };
items.Add(item);
item = new KeyValue() {Key = 2, Value = "Apple" };
items.Add(item);
var myList = new SelectList(items, "Key", "Value", selectedItemId);
The selectedItemId will be the value of an item's key. Then add myList to the ViewData collection with a key that you can use to refer to it from the View. Like:
ViewData["FruitList"] = myList;
In the View, you can then use:
<p>
<label for="FruitList">Fruits:</label>
<%= Html.DropDownList("FruitList") %>
</p>
On postback to the controller action, the "Key" for the selected value is sent as part of formcollection or post parameters, and you can access the value using the "FruitList".