Kermit Piper wrote:[color=blue]
> Hello everyone,
>
> OK, let me try and explain again please. Here is what I'm trying to do.
> I have a 12-digit
> (UPC-A) javascript validation script which works great. All I need now
> is a similar script for 8-digit (UPC-E) type script?[/color]
The least you could do is find a valid 8 digit number (or a few of them)
to check against. Here is a script that:
Checks that the input is 8 characters.
Checks that the first digit is zero
Calculates the UPC check digit based on the 1st to 7th digits
Checks if the result is equal to the 8th digit.
You need to verify that the above agorithm is correct (in particular,
whether the first digit is included in the calculation of the check
digit - I've used it).
<script type="text/javascript">
// Check if string of digits is valid UPC-E code
function checkUPCE(n)
{
if (!/^\d{8}$/.test(n)) return 'Input must be 8 digits';
if ('0' != n.substring(0,1)) return 'Input must start with 0';
return n.substring(7) == getUPCCheckDigit(n.substring(0,7));
}
// Return check digit for a string of digits
function getUPCCheckDigit(x)
{
x = (''+x).split('');
for (var i=0, z=0, len=x.length; i<len; ++i){
z += (i%2)? +x[i] : x[i]*3;
}
z = z%10;
return (z)? 10-z : z;
}
</script>
<form action="">
<div>
<div><input type="text" name="inp01" value="02369761">
<input type="button" value="Check UPC-E"
onclick="alert(checkUPCE(this.form.inp01.value));" >
<input type="reset">
</div>
</form>
[...]
--
Rob
