Asp – RequiredFieldvalidator

asp.net

how to use required field validator for dropdownlist?.

my dropdown list having

-Day-

item1

item2

Best Solution

Use InitialValue property as the default item that you don't want to be selected :

<asp:DropDownList ID="ddlItems" runat="server">
    <asp:ListItem Text="-Day-" Value="-Day-"></asp:ListItem>
    <asp:ListItem Text="Item 1" Value="Item 1"></asp:ListItem>
    <asp:ListItem Text="Item 2" Value="Item 2"></asp:ListItem>
</asp:DropDownList>

<asp:RequiredFieldValidator runat="server" ID="RequiredFieldValidator1" 
    ErrorMessage="Validation Message !" ControlToValidate="ddlItems" 
    InitialValue="-Day-"></asp:RequiredFieldValidator>

Related Solutions

Jquery – How to format a Microsoft JSON date

eval() is not necessary. This will work fine:

var date = new Date(parseInt(jsonDate.substr(6)));

The substr() function takes out the /Date( part, and the parseInt() function gets the integer and ignores the )/ at the end. The resulting number is passed into the Date constructor.

I have intentionally left out the radix (the 2nd argument to parseInt); see my comment below.

Also, I completely agree with Rory's comment: ISO-8601 dates are preferred over this old format - so this format generally shouldn't be used for new development.

For ISO-8601 formatted JSON dates, just pass the string into the Date constructor:

var date = new Date(jsonDate); //no ugly parsing needed; full timezone support

C# – How to create a dropdownlist from an enum in ASP.NET MVC

For MVC v5.1 use Html.EnumDropDownListFor

@Html.EnumDropDownListFor(
    x => x.YourEnumField,
    "Select My Type", 
    new { @class = "form-control" })

For MVC v5 use EnumHelper

@Html.DropDownList("MyType", 
   EnumHelper.GetSelectList(typeof(MyType)) , 
   "Select My Type", 
   new { @class = "form-control" })

For MVC 5 and lower

I rolled Rune's answer into an extension method:

namespace MyApp.Common
{
    public static class MyExtensions{
        public static SelectList ToSelectList<TEnum>(this TEnum enumObj)
            where TEnum : struct, IComparable, IFormattable, IConvertible
        {
            var values = from TEnum e in Enum.GetValues(typeof(TEnum))
                select new { Id = e, Name = e.ToString() };
            return new SelectList(values, "Id", "Name", enumObj);
        }
    }
}

This allows you to write:

ViewData["taskStatus"] = task.Status.ToSelectList();

by using MyApp.Common