Textbox Validations using javascript

jithendar84 · January 18th, 2008, 02:49 AM

Hi friends i need to enter only numeric in textboxes.i tried this coed but it is not working.Can u mention wat is wrong in this code

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

    <SCRIPT language=Javascript>

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

         return true;
      }

   </SCRIPT>

Code-Behind File
protected void Page_Load(object sender, EventArgs e)
    {
        TextBox1.Attributes.Add("onkeypress", "javascript:return allownumbers(event);");
    }

rstelma · January 18th, 2008, 02:59 PM

Try this for numbers only.

function IsNumeric(sText)
{
   var ValidChars = "0123456789.";
   var IsNumber=true;
   var Char;

   for (i = 0; i < sText.length && IsNumber == true; i++)
      {
      Char = sText.charAt(i);
      if (ValidChars.indexOf(Char) == -1)
         {
         IsNumber = false;
         }
      }
   return IsNumber;

   }

or this if you want to let them include decimals.

function ValidateForm(form)
{
   if(IsEmpty(form.account_number))
   {
      alert('You have not entered an account number')
      form.account_number.focus();
      return false;
   }

   if (!IsNumeric(form.account_number.value))
   {
      alert('Please enter only numbers or decimal points in the account field')
      form.account_number.focus();
      return false;
      }

return true;

}

urtrivedi · January 18th, 2008, 03:12 PM