HEELPBOOK - Validate your EAN barcode (Javascript) ######################

Note that this code can validate EAN-8 and EAN-13 barcodes.

function checkEan(eanCode) {
// Check if only digits
var ValidChars = "0123456789";
for (i = 0; i < eanCode.length; i++) {
digit = eanCode.charAt(i);
if (ValidChars.indexOf(digit) == -1) {
return false;
}
}
// Add five 0 if the code has only 8 digits
if (eanCode.length == 8 ) {
eanCode = "00000" + eanCode;
}
// Check for 13 digits otherwise
else if (eanCode.length != 13) {
return false;
}
// Get the check number
originalCheck = eanCode.substring(eanCode.length - 1);
eanCode = eanCode.substring(0, eanCode.length - 1);
// Add even numbers together
even = Number(eanCode.charAt(1)) +
Number(eanCode.charAt(3)) +
Number(eanCode.charAt(5)) +
Number(eanCode.charAt(7)) +
Number(eanCode.charAt(9)) +
Number(eanCode.charAt(11));
// Multiply this result by 3
even *= 3;
// Add odd numbers together
odd = Number(eanCode.charAt(0)) +
Number(eanCode.charAt(2)) +
Number(eanCode.charAt(4)) +
Number(eanCode.charAt(6)) +
Number(eanCode.charAt(8)) +
Number(eanCode.charAt(10));
// Add two totals together
total = even + odd;
// Calculate the checksum
// Divide total by 10 and store the remainder
checksum = total % 10;
// If result is not 0 then take away 10
if (checksum != 0) {
checksum = 10 - checksum;
}
// Return the result
if (checksum != originalCheck) {
return false;
}
return true;
}


############ ARTICLE INFO #############

Article Month: February
Article Date: 26/02/2013
Permalink: http://heelpbook.altervista.org/2013/validate-your-ean-barcode-javascript/
Source: http://www.logikdev.com/2010/05/13/validate-your-ean-barcode/
Language: English

View more articles on: http://www.heelpbook.net/
Follow us on Facebook: http://it-it.facebook.com/pages/HeelpBook/100790870008832
Follow us on Twitter: https://twitter.com/#!/HeelpBook
Follow us on RSS Feed: http://feeds.feedburner.com/Heelpbook
Follow us on Delicious: http://delicious.com/heelpbook
Linkedin: http://it.linkedin.com/pub/stefano-maggi/27/73a/b20
Google+ : https://plus.google.com/116990277568167008289/posts