>What's the best way to make sure the users only enter numbers in the web page textboxes? My options I think are:
>
>1. Running a jscript to check each field just prior to form submission and prompt the user to enter only numbers.
>2. When posting entered data, call a function to convert all values to numeric.
>
>I have a form with 50 textboxes that should only have numbers when it's posted and unsure from standpoint of accuracy and performance which method is best.


HTH: Here are a couple of JScript function you can try depending on what you want to do when a non-numeric is entered:

/******************************************************************************
** This function pulls out all numberic characters from a text string
** (as well as the sign and decimal). The return value is then suitable
** for use in the "parseInt" and "parseFloat" functions.
** The function STOPS parsing once a non-numeric character is found
** (with the exceptions of the dollar sign, plus sign, comma, and space)
******************************************************************************/
function ToNumeric(sText)
{
var i, iStart, iEnd, iSign;
var cChar, sNumbers;

iEnd = sText.length - 1;
iSign = 1;
sNumbers = '';

if (iEnd == -1)
{
return '0';
}

for (i=0; i<=iEnd; i++)
{
cChar = sText.charAt(i);

switch (cChar)
{
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
case '.':
sNumbers += cChar;
break;

case '$':
case ',':
case '+':
case ' ':
break;

case '-':
iSign *= -1;
break;

default:
i = iEnd;
break;
}
}

if (sNumbers == '') sNumbers = '0';

return (iSign == -1 ? "-" : "") + sNumbers;
}

/******************************************************************************
** A simple function to encapsulate the parseInt/ToNumeric functions.
******************************************************************************/
function CInt(sText)
{
return parseInt(ToNumeric(sText));
}

/******************************************************************************
** A simple function to encapsulate the parseFloat/ToNumeric functions.
******************************************************************************/
function CSng(sText)
{
return parseFloat(ToNumeric(sText));
}

/******************************************************************************
** Performs a close approximation to the VB "IsNumeric" function.
******************************************************************************/
function IsNumeric(sValue)
{
var i, x, sgn = 0, InDigits = false;
var sPattern = " 0123456789.,$+-";
var sText = Trim(sValue);
var iEnd = sText.length - 1;

// Empty strings are not numeric.
if (iEnd == -1) return false;

for (i=0; i<=iEnd; i++)
{
x = sPattern.indexOf(sText.charAt(i));

// If it's not in the pattern, we're done.
if (x == -1) return false;

// Set a flag the first time we encounter a digit.
if (x > 0 && x < 11) InDigits = true;

// If we find a space after the numbers, then we quit.
if (x == 0 && InDigits) return false;

// We're done if we find more than one "-" or "+".
if (x > 13)
{
sgn++;
if (sgn > 1) return false;
}
}

return true;
}