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I need an example in which the user is only able to write numeric values in a text field.

Actually, I have one field called PhoneNumber where the user can write numbers. But he is also able to write characters. The user should not be able to write characters in the phone number text field.

Updated 13-May-13 23:49pm


validate textbox with RegularExpressionValidator like blow.
its allow only numeric values only into textbox.

<asp:RegularExpressionValidator ID="rxv1" runat="server"

                ErrorMessage="Pls enter Numerics Only" EnableClientScript="true"

             ControlToValidate="txtbox" ValidationExpression="\d+"></asp:RegularExpressionValidator>

see may its helpful to u.
thank u.
You could use masked input, like this:[^].
And don't forget to validate on server side too!
Check beow link for jQuery plugin for phone number masked textbox and[^]
Here is another solution for you.

   <SCRIPT language=Javascript>
      function isNumberKey(evt)
         var charCode = (evt.which) ? evt.which : event.keyCode
         if (charCode > 31 && (charCode < 48 || charCode > 57))
            return false;

         return true;
      <INPUT id="txtChar" onkeypress="return isNumberKey(event)" type="text" name="txtChar">

I found it here :[^]
//Javascript code
function ValidateInteger(text) {
    var strString = text.value
    var strValidChars = "0123456789";
    var strChar;
    for (i = 0; i < strString.length; i++) {
        strChar = strString.charAt(i);
        if (strValidChars.indexOf(strChar) == -1) {
            text.value = text.value.substring(0, i);
            return false;

//use it:
<asp:TextBox ID="txtbox1" runat="server" onkeyup="ValidateInteger(this);"></asp:TextBox>
CHill60 26-Jul-14 9:05am
"Numeric" does not imply "Integer only". Why not use NaN()?

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