Input validation for 10, 11 and 12-digit UPC Codes

[Kermit Piper]

Hello,

I have been searching, Googling, searching. Cannot find a javascript to
calc 10, 11 or 12 digit UPC codes. I just need an algorithm that calcs
to verify the correct check digit. I have found a few that add the
check digit then do the final calc, but I need an input validation that
will verify the UPC as being correct with the correct check digit after
the user simply enteres the number in one text box. There has to be
something out there, but darned if I can find it. I'd also settle for a
java api, but couldn't find any of those either. There's a few creidt
card format validators, but no UPC. If anyone knows of any I would
greatly appreciate it. Is this something that can be done witht the
modulus operator and regular expressions? I'd even pay for a third
party validation tool but I can't find ANYTHING!

Thanks,
KP

[Randy Webb]

Kermit Piper said the following on 2/7/2006 12:00 AM:

Hello,

I have been searching, Googling, searching. Cannot find a javascript to
calc 10, 11 or 12 digit UPC codes. I just need an algorithm that calcs
to verify the correct check digit.

This is for 12 digit only. If you can find a site that explains 10 or
11, post a URL.

Sample UPC Code it uses: 0 64200 11589 6

Step 1: Sum all of the digits in the odd positions together.

0+4+0+1+5+9 = 19

Step 2: Mutliply the sum from Step 1 by 3.

3 * 19 = 57

Step 3: Sum all of the digits in the even positions together.

6+2+0+1+8 = 17

Step 4: Sum together the results from Step 2 and Step 3.

17 + 57 = 74

Step 5: Subtract the sum from the next highest multiple of 10.

80 - 74 = 6 [check digit]

From this site:

<URL: http://www.cs.queensu.ca/~bradbury/c...t/upccheck.htm >

Number 2 Hit for "Validate UPC Code".

Not sure how "correct" that information is though.

Sample script to do that:

<script type="text/javascript">
function validateUPCCode (UPCField){
var myArray = UPCField.value. split('');
step1 = 0;
var tempVar = myArray.length;
for (var i=0;i<tempVar;i =i+2){
step1 = step1 + +myArray[i];
}
var step2=step1*3;
step3 = 0;
for(var i=1;i<tempVar-1;i=i+2){step3= step3+(+myArray[i]);}
step4 = step2 + step3;
step5 = ((Math.floor(st ep4/10) + 1)*10) - step4;
if (step5 == myArray[myArray.length-1]){alert('valid UPC Code')}
else{alert('inv alid UPC Code')}
}

</script>

<input type="text" onchange="valid ateUPCCode(this )">

--
Randy
comp.lang.javas cript FAQ - http://jibbering.com/faq & newsgroup weekly
Javascript Best Practices - http://www.JavascriptToolbox.com/bestpractices/

[RobG]

Kermit Piper wrote:

Hello,

I have been searching, Googling, searching. Cannot find a javascript to
calc 10, 11 or 12 digit UPC codes. I just need an algorithm that calcs
to verify the correct check digit. I have found a few that add the
check digit then do the final calc, but I need an input validation that
will verify the UPC as being correct with the correct check digit after
the user simply enteres the number in one text box. There has to be
something out there, but darned if I can find it. I'd also settle for a
java api, but couldn't find any of those either. There's a few creidt
card format validators, but no UPC. If anyone knows of any I would
greatly appreciate it. Is this something that can be done witht the
modulus operator and regular expressions? I'd even pay for a third
party validation tool but I can't find ANYTHING!

Very first Google hit for "calculate UPC codes":

<URL:http://www.export911.c om/e911/coding/digiCalc.htm>
the source is here:

<URL:http://www.export911.c om/_bCode/checDigi.js>
Note:
//**All rights reserved
//**Author: Morris Ng
--
Rob

[Randy Webb]

RobG said the following on 2/7/2006 12:39 AM:

Kermit Piper wrote:

Hello,

I have been searching, Googling, searching. Cannot find a javascript to
calc 10, 11 or 12 digit UPC codes. I just need an algorithm that calcs
to verify the correct check digit. I have found a few that add the
check digit then do the final calc, but I need an input validation that
will verify the UPC as being correct with the correct check digit after
the user simply enteres the number in one text box. There has to be
something out there, but darned if I can find it. I'd also settle for a
java api, but couldn't find any of those either. There's a few creidt
card format validators, but no UPC. If anyone knows of any I would
greatly appreciate it. Is this something that can be done witht the
modulus operator and regular expressions? I'd even pay for a third
party validation tool but I can't find ANYTHING!

Very first Google hit for "calculate UPC codes":

<URL:http://www.export911.c om/e911/coding/digiCalc.htm>
the source is here:

<URL:http://www.export911.c om/_bCode/checDigi.js>
Note:
//**All rights reserved
//**Author: Morris Ng

I like mine better :)

--
Randy
comp.lang.javas cript FAQ - http://jibbering.com/faq & newsgroup weekly
Javascript Best Practices - http://www.JavascriptToolbox.com/bestpractices/

[Danny]

All you need is a regexp, what's the UPC string pattern criterion? Be
as concise as possible please.

Danny

[RobG]

Randy Webb wrote:

RobG said the following on 2/7/2006 12:39 AM:

Kermit Piper wrote:

Hello,

I have been searching, Googling, searching. Cannot find a javascript to
calc 10, 11 or 12 digit UPC codes. I just need an algorithm that calcs
to verify the correct check digit. I have found a few that add the
check digit then do the final calc, but I need an input validation that
will verify the UPC as being correct with the correct check digit after
the user simply enteres the number in one text box. There has to be
something out there, but darned if I can find it. I'd also settle for a
java api, but couldn't find any of those either. There's a few creidt
card format validators, but no UPC. If anyone knows of any I would
greatly appreciate it. Is this something that can be done witht the
modulus operator and regular expressions? I'd even pay for a third
party validation tool but I can't find ANYTHING!

Very first Google hit for "calculate UPC codes":

<URL:http://www.export911.c om/e911/coding/digiCalc.htm>
the source is here:

<URL:http://www.export911.c om/_bCode/checDigi.js>
Note:
//**All rights reserved
//**Author: Morris Ng

I like mine better :)

Yeah, it's really awful! Must be paid by the yard... the following
replicates the essential logic as far as I can tell, it gives the same
results for the same test set but I can't vouch for the algorithm, which
is very similar to (the same as?) yours.

I've used 'sumEven' for the elements with even indexes (0-10), which
equates to your odd digits (1-11). Same logic for sumOdd.
<script type="text/javascript">

function calcUPC(x)
{
// Validate input is 11 digits
if (!/^\d{11}$/.test(x)){
alert("Enter 11 digits");
return '';
}

// Turn into array and do sums
x = x.split('');
var evenSum = 0, oddSum = 0;
for (var i=0, len=x.length; i<len; ++i){
(i%2)? oddSum += +x[i] : evenSum += +x[i];
}
var z = (evenSum*3 + oddSum)%10;

// Calc check digit and return it
return (z)? 10-z : z;
}

</script>

<form action="">
<input type="text" name="inVal">
<input type="text" name="outVal">
<input type="button" value="Calculat e check digit"
onclick="this.f orm.outVal.valu e = calcUPC(this.fo rm.inVal.value) ;">
</form>


--
Rob

[Kermit Piper]

Thanks Randy, this works great! Do you think it would be possible to
modify this to validate 10 and 11-digit UPC codes as well?

Thanks,
KP

[Randy Webb]

Kermit Piper said the following on 2/7/2006 2:59 PM:

Please quote what you are replying to.

If you want to post a followup via groups.google.c om, don't use the
"Reply" link at the bottom of the article. Click on "show options" at
the top of the article, then click on the "Reply" at the bottom of the
article headers.

Thanks Randy, this works great! Do you think it would be possible to
modify this to validate 10 and 11-digit UPC codes as well?

If you can find a site that explains how the checksum in 10 and 11 digit
UPC Codes works, sure.

Maybe later I will look at the site Rob found and see what it says about
10 and 11 digit UPC's. The one I found only explained 12 digits.

--
Randy
comp.lang.javas cript FAQ - http://jibbering.com/faq & newsgroup weekly
Javascript Best Practices - http://www.JavascriptToolbox.com/bestpractices/

[Randy Webb]

Danny said the following on 2/7/2006 1:06 AM:

All you need is a regexp,

You should really consider what you write before you post it. But, I
will give you the benefit of the doubt and ask you for a RegExp that
will sum the digits in even charAt positions and sum the digits in odd
charAt positions. After all, that is how checksums work.
--
Randy
comp.lang.javas cript FAQ - http://jibbering.com/faq & newsgroup weekly
Javascript Best Practices - http://www.JavascriptToolbox.com/bestpractices/

[Kermit Piper]

Thanks for everyone's input. the 12-digit function works, now I just
need to find one for UPC-E (I have a conversion script for UPC-A to
UPC-E, but I'd like to try and find a straight, simple function like
the one posted here for the 12-digit. The conversino script only takes
in the middle 6 digits, which means I would have to go through and
strip digits, etc. It's already getting too messy. Thanks again
everyone.