formvalidation
Version:
The best jQuery plugin to validate form fields. Support Bootstrap, Foundation, Pure, SemanticUI, UIKit and custom frameworks
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JavaScript
/**
* isbn validator
*
* @link http://formvalidation.io/validators/isbn/
* @author https://twitter.com/nghuuphuoc
* @copyright (c) 2013 - 2015 Nguyen Huu Phuoc
* @license http://formvalidation.io/license/
*/
(function($) {
FormValidation.I18n = $.extend(true, FormValidation.I18n || {}, {
'en_US': {
isbn: {
'default': 'Please enter a valid ISBN number'
}
}
});
FormValidation.Validator.isbn = {
/**
* Return true if the input value is a valid ISBN 10 or ISBN 13 number
* Examples:
* - Valid:
* ISBN 10: 99921-58-10-7, 9971-5-0210-0, 960-425-059-0, 80-902734-1-6, 85-359-0277-5, 1-84356-028-3, 0-684-84328-5, 0-8044-2957-X, 0-85131-041-9, 0-943396-04-2, 0-9752298-0-X
* ISBN 13: 978-0-306-40615-7
* - Invalid:
* ISBN 10: 99921-58-10-6
* ISBN 13: 978-0-306-40615-6
*
* @see http://en.wikipedia.org/wiki/International_Standard_Book_Number
* @param {FormValidation.Base} validator The validator plugin instance
* @param {jQuery} $field Field element
* @param {Object} [options] Can consist of the following keys:
* - message: The invalid message
* @returns {Boolean}
*/
validate: function(validator, $field, options) {
var value = validator.getFieldValue($field, 'isbn');
if (value === '') {
return true;
}
// http://en.wikipedia.org/wiki/International_Standard_Book_Number#Overview
// Groups are separated by a hyphen or a space
var type;
switch (true) {
case /^\d{9}[\dX]$/.test(value):
case (value.length === 13 && /^(\d+)-(\d+)-(\d+)-([\dX])$/.test(value)):
case (value.length === 13 && /^(\d+)\s(\d+)\s(\d+)\s([\dX])$/.test(value)):
type = 'ISBN10';
break;
case /^(978|979)\d{9}[\dX]$/.test(value):
case (value.length === 17 && /^(978|979)-(\d+)-(\d+)-(\d+)-([\dX])$/.test(value)):
case (value.length === 17 && /^(978|979)\s(\d+)\s(\d+)\s(\d+)\s([\dX])$/.test(value)):
type = 'ISBN13';
break;
default:
return false;
}
// Replace all special characters except digits and X
value = value.replace(/[^0-9X]/gi, '');
var chars = value.split(''),
length = chars.length,
sum = 0,
i,
checksum;
switch (type) {
case 'ISBN10':
sum = 0;
for (i = 0; i < length - 1; i++) {
sum += parseInt(chars[i], 10) * (10 - i);
}
checksum = 11 - (sum % 11);
if (checksum === 11) {
checksum = 0;
} else if (checksum === 10) {
checksum = 'X';
}
return (checksum + '' === chars[length - 1]);
case 'ISBN13':
sum = 0;
for (i = 0; i < length - 1; i++) {
sum += ((i % 2 === 0) ? parseInt(chars[i], 10) : (parseInt(chars[i], 10) * 3));
}
checksum = 10 - (sum % 10);
if (checksum === 10) {
checksum = '0';
}
return (checksum + '' === chars[length - 1]);
default:
return false;
}
}
};
}(jQuery));