ASP.Net MVC Add Items To Bound Dropdownlist

Question

My page view currently has a dropdownlist on it that is getting bound to a collection from the controller. This is working fine, However I want to insert an item to the top of the dropdownlist that is not in my collection e.g the list currently gets the following items

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I want to add a third option of "All" but I don't want to add this option to my database. In Webforms I would have just bound the control then inserted another item however it seems this is not possible with MVC, am I right in thinking I will need to add some Javascript to the view to add this new item once the dropdownlist has been bound?

Thanks

Why not to use <%= Html.DropDownList("DropDown","all" )%> ? because at server side value will be null or empty string i guess.. and you get the condition. — Vikas
– Vikas, Commented Jun 5, 2009 at 13:19

tvanfosson · Accepted Answer · 2009-06-05 13:19:16Z

9

No. Construct your data as a list of SelectListItems and prepend in the controller.

   var list = db.Table
                .Select( t => new SelectListItem
                              { 
                                  Key = t.ID.ToString(),
                                  Value = t.Name
                              } )
                .ToList();
   list.Insert( 0, new SelectListItem { Key = "-1", Value = "All" } );

   ViewData["TableSelect"] = list;

On the view side:

   <%= Html.DropDownList( "TableID",
                          (IEnumerable<SelectListItem>)ViewData["TableSelect"] ) %>

edited Jun 5, 2009 at 13:19

answered Jun 5, 2009 at 12:19

tvanfosson

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5 Comments

Vikas Over a year ago

We can also use <%= Html.DropDownList("TableSelect" )%> directly if the same name contains in viewdata.

Vikas Over a year ago

Ultimately he has to check it at server side because GavD Don't want "all" to be in DB

Gavin Over a year ago

I cant get list.Insert to work its implying there is no insert method

Vikas Over a year ago

Because list is of type Interface ( IQueryable) and there is no way to add new item in it, unless you merge two Interface.

tvanfosson Over a year ago

Sorry -- missed a step. After selecting the new SelectListItems you need to add a ToList() to make it into List<SelectListItem> instead of IEnumerable<SelectListItem>. Then you can add to it. I've updated.

Vikas · Accepted Answer · 2009-06-05 12:18:29Z

0

Simple

you can make it as you wish in controller.

and pass it in viewdata.

other option is directly in view page.

<%= Html.DropDownList("DropDown","all" )%>

But you can add only one option..

Make sure you are not storing added options in ur db, right? so before you save it, check option value in action and apply your logic.

answered Jun 5, 2009 at 12:18

Vikas

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1 Comment

tvanfosson Over a year ago

The value for this is the empty string and as such I don't think it will get posted back. If you want a value like "all" instead of "none", you'll need to adjust the list on the server side (or with Javascript).

DenisJC · Accepted Answer · 2018-05-16 07:33:42Z

0

Newer implementation

var list = _db.Status.ToList();
list.Add(new Status(){DevelopmentStatusID = -1, DevelopmentStatusDesc = "All"});
var result = list.OrderBy(d => d.StatusID).ToList();

ViewBag.StatusID = new SelectList(result, "StatusID", "StatusDesc");

Then in the index.html

    @Html.DropDownList("StatusID", null, htmlAttributes: new {@class = "form-control"})

answered May 16, 2018 at 7:33

DenisJC

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