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Issue #2790551 by steveoliver, bojanz, borisson_: Implement a JS library for the credit card form
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‎modules/payment/commerce_payment.libraries.yml‎

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credit_card_validation:
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version: VERSION
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js:
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js/credit-card-validation.js: {}
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dependencies:
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- core/jquery
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payment_method_form:
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version: VERSION
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css:

‎modules/payment/js/credit-card-validation.js‎

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/**
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* @file
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* Attaches credit card validation logic.
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*/
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(function ($) {
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'use strict';
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var types = {};
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var VISA = 'visa';
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var MASTERCARD = 'master-card';
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var AMEX = 'amex';
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var DINERSCLUB = 'dinersclub';
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var DISCOVER = 'discover';
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var MAESTRO = 'maestro';
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types[VISA] = {
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niceType: 'Visa',
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type: VISA,
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pattern: ['4'],
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gaps: [4, 8, 12],
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lengths: [16]
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};
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types[MASTERCARD] = {
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niceType: 'MasterCard',
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type: MASTERCARD,
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pattern: ['51-55', '222100-272099'],
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gaps: [4, 8, 12],
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lengths: [16]
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};
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types[AMEX] = {
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niceType: 'American Express',
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type: AMEX,
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pattern: ['34', '37'],
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lengths: [15]
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};
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types[DINERSCLUB] = {
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niceType: 'Diners Club',
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type: DINERSCLUB,
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pattern: ['300-305', '309', '36', '38', '39'],
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lengths: [14]
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};
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types[DISCOVER] = {
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niceType: 'Discover Card',
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type: DISCOVER,
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pattern: ['6011', '622126-622925', '644-649', '65'],
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lengths: [16, 19]
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};
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types[MAESTRO] = {
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niceType: 'Maestro',
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type: MAESTRO,
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pattern: [
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'5018',
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'5020',
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'5038',
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'5612',
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'5893',
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'6304',
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'6759',
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'6761',
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'6762',
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'6763',
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'0604',
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'6390'
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],
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lenghts: [12, 13, 14, 15, 16, 17, 18, 19]
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};
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/**
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* Detect the type of credit card.
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*
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* @param {string} number
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*
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* @return {object|boolean}
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*/
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var detectType = function (number) {
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// Loop over all available types.
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for (var x in types) {
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var type = types[x];
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// Loop over all patterns in the type.
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for (var i in type.pattern) {
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var pattern = type.pattern[i];
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// If the pattern has a dash, we should create a range of patterns.
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if (pattern.indexOf('-') >= 0) {
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var exploded_pattern;
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var ranges = [];
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var range;
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exploded_pattern = pattern.split('-');
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while (exploded_pattern[0] <= exploded_pattern[1]) {
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ranges.push(exploded_pattern[0]);
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exploded_pattern[0]++;
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}
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for (range in ranges) {
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if (validatePrefix(number, range)) {
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return type;
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}
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}
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}
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// No dashes, so just validate this pattern.
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else if (validatePrefix(number, pattern)) {
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return type;
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}
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}
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}
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return false;
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};
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/**
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* Validate the prefix is according to the expected prefix.
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*
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* @param {string} number
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* @param {string} prefix
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*
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* @return {boolean}
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*/
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var validatePrefix = function (number, prefix) {
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return number.substring(0, prefix.length) == prefix + '';
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};
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/**
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* Validate credit card.
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*
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* @param {string} number
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* @param {object} type
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*
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* @return {boolean}
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*/
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var validateCreditCard = function (number, type) {
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// Make sure that the type is really the expected type.
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if (detectType(number) != type) {
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return false;
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}
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// Test that the length of the card is actually one of the expected lengths
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// defined in the type.
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for (var x in type.lengths) {
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var expected_lenght = type.lengths[x];
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if (number.length === expected_lenght) {
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return true;
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}
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}
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return false;
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};
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/**
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* Trigger all other validations.
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*
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* @param {object} element
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*/
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var cardInputBlur = function (element) {
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var value = element.val();
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// Strip spaces from the value for all validations.
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value = value.replace(/ /gi, '');
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// If the value is not filled in, don't do any validation.
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var empty_value = value.length === 0;
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if (empty_value) {
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element.addClass('invalid-cc');
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return;
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}
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// Get the type of the card.
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var type = detectType(value);
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// If no type is found, don't bother doing anything else.
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if (!type) {
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element.addClass('invalid-cc');
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return;
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}
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element.addClass('credit_card');
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element.addClass('credit_card--' + type.type);
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var ValidationDiv = element.parent().parent().find('#cc-validation');
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ValidationDiv.html('');
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var ccv_field = $("input[name='payment_information[add][payment_details][security_code]']");
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if (ccv_field.size() > 0) {
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var ccv_value = ccv_field.val();
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if (ccv_value.length == 0) {
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ValidationDiv.append('CCV is not filled in');
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return;
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}
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}
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ValidationDiv.append('CC is of type: ' + type.niceType);
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// Check if the card is actually valid as well.
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var is_valid = validateCreditCard(value, type);
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if (is_valid) {
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ValidationDiv.append(' CC is valid');
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element.removeClass('invalid-cc');
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element.addClass('valid-cc');
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}
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else {
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ValidationDiv.append(' CC is not valid');
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element.removeClass('valid-cc');
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element.addClass('invalid-cc');
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}
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};
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/**
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* Element onkey upvalidation.
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*
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* @param {object} element
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*/
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var cardInputKeyup = function (element) {
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var value = element.val();
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// Strip spaces from the value for all validations.
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value = value.replace(/ /gi, '');
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// If the value is not filled in, don't do any validation.
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var empty_value = value.length === 0;
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if (empty_value) {
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element.addClass('invalid-cc');
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return;
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}
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// Get the type of the card.
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var type = detectType(value);
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// If no type is found, don't bother doing anything else.
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if (!type) {
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element.addClass('invalid-cc');
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return;
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}
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element.removeClass('invalid-cc');
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element.addClass('credit_card');
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element.addClass('credit_card--' + type.type);
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};
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Drupal.behaviors.creditCardValidation = {
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attach: function (context, settings) {
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$('#edit-payment-information-add-payment-details-number', context).each(function () {
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var element = $(this);
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$(element).on('blur', function () {
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cardInputBlur(element);
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});
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$(element).on('keyup', function() {
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cardInputKeyup(element);
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});
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});
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}
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};
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})(jQuery);

‎modules/payment/src/PluginForm/PaymentMethodAddForm.php‎

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];
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if ($payment_method->bundle() == 'credit_card') {
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$form['payment_details'] = $this->buildCreditCardForm($form['payment_details'], $form_state);
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$form['#attached']['library'][] = 'commerce_payment/credit_card_validation';
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}
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elseif ($payment_method->bundle() == 'paypal') {
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$form['payment_details'] = $this->buildPayPalForm($form['payment_details'], $form_state);
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'#required' => TRUE,
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'#maxlength' => 19,
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'#size' => 20,
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'#suffix' => '<div id="cc-validation"></div>',
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];
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$element['expiration'] = [
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'#type' => 'container',

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