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/** * jQuery Form Validator Module: Security * ------------------------------------------ * Created by Victor Jonsson <http://www.victorjonsson.se> * * This form validation module adds validators typically used on * websites in the UK. This module adds the following validators: * - ukvatnumber * * @website http://formvalidator.net/#uk-validators * @license Dual licensed under the MIT or GPL Version 2 licenses * @version 2.1.35 */ $.formUtils.addValidator({ name : 'ukvatnumber', validatorFunction : function(number) { // Code Adapted from http://www.codingforums.com/showthread.php?t=211967 // TODO: Extra Checking for other VAT Numbers (Other countries and UK Government/Health Authorities) number = number.replace(/[^0-9]/g, ''); //Check Length if(number.length < 9) { return false; } var valid = false; var VATsplit = []; VATsplit = number.split(""); var checkDigits = Number(VATsplit[7] + VATsplit[8]); // two final digits as a number var firstDigit = VATsplit[0]; var secondDigit = VATsplit[1]; if ((firstDigit == 0) && (secondDigit >0)) { return false; } var total = 0; for (var i=0; i<7; i++) { // first 7 digits total += VATsplit[i]* (8-i); // sum weighted cumulative total } var c = 0; var i = 0; for (var m = 8; m>=2; m--) { c += VATsplit[i]* m; i++; } // Traditional Algorithm for VAT numbers issued before 2010 while (total > 0) { total -= 97; // deduct 97 repeatedly until total is negative } total = Math.abs(total); // make positive if (checkDigits == total) { valid = true; } // If not valid try the new method (introduced November 2009) by subtracting 55 from the mod 97 check digit if we can - else add 42 if (!valid) { total = total%97 // modulus 97 if (total >= 55) { total = total - 55 } else { total = total + 42 } if (total == checkDigits) { valid = true; } } return valid; }, errorMessage : '', errorMessageKey: 'badUKVatAnswer' });
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