ASP.NET MVC Multiselect ListBox is not selecting multiple values

Question

Here is my Model Class

public class OperationStudyInputViewModel
{
   public IEnumerable<string> AttachmentId { get; set; }
}

Here is my Controller Method:

public ActionResult OperationStudyInput()
{
    var attachmentList = _dbContext.AttachmentAndFolders
        .Where(x => x.IsAttachementOrFolder == "Attachment")
        .Select(x => new 
        {
            x.AttchmentFolderId,
            x.Name
        }).ToList();
    ViewBag.AttachmentList = new MultiSelectList(attachmentList, "AttchmentFolderId", "Name");
}

Here is View :

<div class="input-group input-group-lg col-md-6">
    @Html.LabelFor(model => model.AttachmentId, htmlAttributes: new { @class = "input-group-addon" })
    @Html.ListBoxFor(model => model.AttachmentId,(MultiSelectList)ViewBag.AttachmentList)
</div>

MultiSelet Textbox is rendering properly but it selecting only one value, its not selecting multiple value.

Cannot identify where the problem actually is!! Any Help Please!!

Its selecting only one value..If I try to select another value after selecting one, the previous selection is being lost. — TanvirArjel
– TanvirArjel, Commented Feb 19, 2017 at 12:00
Not related, but suggest you just use ViewBag.AttachmentList = dbContext.AttachmentAndFolders.Where(...).Select(x => new SelectListItem{ Value = x.AttchmentFolderId, Text = x.Name }); and @Html.ListBoxFor(m => m.AttachmentId,(IEnumerable<SelectListItem>)ViewBag.AttachmentList) — user3559349
– user3559349, Commented Feb 19, 2017 at 12:02
What your claiming is not possible - your code generates a <select multiple="multiple" ... > element. Do you have any javascript that is altering the behavior? — user3559349
– user3559349, Commented Feb 19, 2017 at 12:04
May be Not!! By the way should I hold down the control button to select multiple or just clicking serially on individual...?? — TanvirArjel
– TanvirArjel, Commented Feb 19, 2017 at 12:20

Jay Pondy · Accepted Answer · 2017-02-19 16:51:51Z

1

Multiselect List Boxes require that you hold down Ctrl to select multiple items.

answered Feb 19, 2017 at 16:51

Jay Pondy

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