Display only numbers in a textbox

Question

work on C# asp.net C#.I am having textbox to enter only numbers not letters.

If someone try to enter letters then he fail to enter letter.

Length of entering a number is finite like : he can enter 100 to 200. not more than.

<asp:TextBox ID="txtLength" runat="server" onkeydown="return javascript:DigitOnly(this)" >0</asp:TextBox>

want numedic text box? where user can only input number like : int ,double not any letter.

Answer 1

Like this:

onkeydown="return DigitOnly(event, this);"

function DigitOnly(event, elm)
{
    var key = String.fromCharCode(event.keyCode ? event.keyCode : event.which);
    return key.match(/\d/) && elm.value.length < 200;
}

You could make it better by allowing arrow keys, copy & paste, etc.

Answer 2

You can try javascript input masking e.g.: Masked Input Plugin by digitalBush.