formvalidation/src/js/validator/siret.js

The best jQuery plugin to validate form fields. Support Bootstrap, Foundation, Pure, SemanticUI, UIKit and custom frameworks

/**
 * siret validator
 *
 * @link        http://formvalidation.io/validators/siret/
 * @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': {
			siret: {
				'default': 'Please enter a valid SIRET number'
			}
		}
    });

	FormValidation.Validator.siret = {
        /**
         * Check if a string is a siret number
         *
         * @param {FormValidation.Base} validator The validator plugin instance
         * @param {jQuery} $field Field element
         * @param {Object} options Consist of key:
         * - message: The invalid message
         * @returns {Boolean}
         */
		validate: function(validator, $field, options) {
			var value = validator.getFieldValue($field, 'siret');
			if (value === '') {
				return true;
			}

			var sum    = 0,
                length = value.length,
                tmp;
			for (var i = 0; i < length; i++) {
                tmp = parseInt(value.charAt(i), 10);
				if ((i % 2) === 0) {
					tmp = tmp * 2;
					if (tmp > 9) {
						tmp -= 9;
					}
				}
				sum += tmp;
			}
			return (sum % 10 === 0);
		}
	};
}(jQuery));