CODEWITHSUNDEEP
c#asp.net-mvcdatetimedropdownlistfor
Jennica
Jennica

Reputation: 175

DropDownListFor not selecting selected

I have a dropdownlistfor which lists selectable dates. I want to pre-select a certain date but even though it's marked as "Selected" it doesn't show as the selected when looking at the dropdownlist.

enter image description here

<%=Html.DropDownListFor(model => model.SelectDropOfDate, Model.DropOffDates, new { id = "dropOfDate" })%>

In one thread that I read they said that "model.SelectDropOfDate" (in this case) is the selected item and if that's the case, should I select the value or the text in order for it to match the one in the list? 

(the list of dates).Where(x=>x.Selected).Select(z=>z.Value).ToString();

(Ps: I've tried both value and text and none of them worked)

Any ideas?

Upvotes: 0

Views: 647

Answers (3)

Jennica
Jennica

Reputation: 175

My appologies, there was a dumb javascript overwriting my selected which screwed things up. I did create a testproject to verify the suggestions here though and here's what I found out (for others that read this thread):

The selectedDropOfDate does not have to be filled in, in fact, it didnt work at all when I had that filled in. Having the List have one item that is marked as selected = true works well enough.

Example code

Model:

public class Home
    {
        public string Selected { get; set; }
        public List<SelectListItem> Items { get; set; }
    }

Controller:

public ActionResult Index()
        {
            var model = new Home();
            model.Items = GetItems(DateTime.Now, DateTime.Now.AddDays(3));
            return View(model);
        }

        private List<SelectListItem> GetItems(DateTime start, DateTime end)
        {
            var dates = new List<DateTime>();
            for (double i = 0; i < 100; i++)
            {
                dates.Add(start.AddDays(i + 1));
            }

            var selectList = new List<SelectListItem>();
            selectList.AddRange(dates.Select(x => new SelectListItem
            {
                Selected = x.Date == end.Date,
                Text = x.ToString("d.M.yyyy"),
                Value = x.ToString("d/M/yyyy", new DateTimeFormatInfo())
            }));

            return selectList;
        }

View:

<%= Html.DropDownListFor(model => model.Selected, Model.Items) %>

Upvotes: 0

Jarvan
Jarvan

Reputation: 1230

It seems like DropDownListFor in asp.mvc has this bug,the 'selected' will not work i thought beacuse the htmlhelper of Lamda Expression covered the 'selected' property.So just make sure model.SelectDropOfDate=departureDate.ToString("d/M/yyyy", new DateTimeFormatInfo()) has run. I have tried this in Mvc3 and it will chosen write item when the value really matches.

Upvotes: 0

Darin Dimitrov
Darin Dimitrov

Reputation: 1039100

You should set the value of the SelectDropOfDate property on your model instead to the corresponding Value (not Text). For example:

model.SelectDropOfDate = departureDate.ToString("d/M/yyyy", new DateTimeFormatInfo());

Also notice that the value must have an exact match in order for the corresponding element to be preselected.

Upvotes: 1

Related Questions