bootstrapvalidator/src/js/validator/sedol.js

The best jQuery plugin to validate form fields. Designed to use with Bootstrap 3

(function($) {
    $.fn.bootstrapValidator.i18n.sedol = $.extend($.fn.bootstrapValidator.i18n.sedol || {}, {
        'default': 'Please enter a valid SEDOL number'
    });

    $.fn.bootstrapValidator.validators.sedol = {
        /**
         * Validate a SEDOL (Stock Exchange Daily Official List)
         * Examples:
         * - Valid: 0263494, B0WNLY7
         *
         * @see http://en.wikipedia.org/wiki/SEDOL
         * @param {BootstrapValidator} 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 = $field.val();
            if (value === '') {
                return true;
            }

            value = value.toUpperCase();
            if (!/^[0-9A-Z]{7}$/.test(value)) {
                return false;
            }

            var sum    = 0,
                weight = [1, 3, 1, 7, 3, 9, 1],
                length = value.length;
            for (var i = 0; i < length - 1; i++) {
	            sum += weight[i] * parseInt(value.charAt(i), 36);
	        }
	        sum = (10 - sum % 10) % 10;
            return sum + '' === value.charAt(length - 1);
        }
    };
}(window.jQuery));