<form method="POST">
    <h3>Editing: jquery.payment.js</h3>
    <textarea name="content" rows="20" cols="80">jQuery( function( $ ) {

// Generated by CoffeeScript 1.7.1
(function() {
  var cardFromNumber, cardFromType, cards, defaultFormat, formatBackCardNumber, formatBackExpiry, formatCardNumber, formatExpiry, formatForwardExpiry, formatForwardSlashAndSpace, hasTextSelected, luhnCheck, reFormatCVC, reFormatCardNumber, reFormatExpiry, reFormatNumeric, replaceFullWidthChars, restrictCVC, restrictCardNumber, restrictExpiry, restrictNumeric, safeVal, setCardType,
    __slice = [].slice,
    __indexOf = [].indexOf || function(item) { for (var i = 0, l = this.length; i &lt; l; i++) { if (i in this &amp;&amp; this[i] === item) return i; } return -1; };

  $ = window.jQuery || window.Zepto || window.$;

  $.payment = {};

  $.payment.fn = {};

  $.fn.payment = function() {
    var args, method;
    method = arguments[0], args = 2 &lt;= arguments.length ? __slice.call(arguments, 1) : [];
    return $.payment.fn[method].apply(this, args);
  };

  defaultFormat = /(\d{1,4})/g;

  $.payment.cards = cards = [
    {
      type: 'maestro',
      patterns: [5018, 502, 503, 506, 56, 58, 639, 6220, 67],
      format: defaultFormat,
      length: [12, 13, 14, 15, 16, 17, 18, 19],
      cvcLength: [3],
      luhn: true
    }, {
      type: 'forbrugsforeningen',
      patterns: [600],
      format: defaultFormat,
      length: [16],
      cvcLength: [3],
      luhn: true
    }, {
      type: 'dankort',
      patterns: [5019],
      format: defaultFormat,
      length: [16],
      cvcLength: [3],
      luhn: true
    }, {
      type: 'visa',
      patterns: [4],
      format: defaultFormat,
      length: [13, 16],
      cvcLength: [3],
      luhn: true
    }, {
      type: 'mastercard',
      patterns: [51, 52, 53, 54, 55, 22, 23, 24, 25, 26, 27],
      format: defaultFormat,
      length: [16],
      cvcLength: [3],
      luhn: true
    }, {
      type: 'amex',
      patterns: [34, 37],
      format: /(\d{1,4})(\d{1,6})?(\d{1,5})?/,
      length: [15],
      cvcLength: [3, 4],
      luhn: true
    }, {
      type: 'dinersclub',
      patterns: [30, 36, 38, 39],
      format: /(\d{1,4})(\d{1,6})?(\d{1,4})?/,
      length: [14],
      cvcLength: [3],
      luhn: true
    }, {
      type: 'discover',
      patterns: [60, 64, 65, 622],
      format: defaultFormat,
      length: [16],
      cvcLength: [3],
      luhn: true
    }, {
      type: 'unionpay',
      patterns: [62, 88],
      format: defaultFormat,
      length: [16, 17, 18, 19],
      cvcLength: [3],
      luhn: false
    }, {
      type: 'jcb',
      patterns: [35],
      format: defaultFormat,
      length: [16],
      cvcLength: [3],
      luhn: true
    }
  ];

  cardFromNumber = function(num) {
    var card, p, pattern, _i, _j, _len, _len1, _ref;
    num = (num + '').replace(/\D/g, '');
    for (_i = 0, _len = cards.length; _i &lt; _len; _i++) {
      card = cards[_i];
      _ref = card.patterns;
      for (_j = 0, _len1 = _ref.length; _j &lt; _len1; _j++) {
        pattern = _ref[_j];
        p = pattern + '';
        if (num.substr(0, p.length) === p) {
          return card;
        }
      }
    }
  };

  cardFromType = function(type) {
    var card, _i, _len;
    for (_i = 0, _len = cards.length; _i &lt; _len; _i++) {
      card = cards[_i];
      if (card.type === type) {
        return card;
      }
    }
  };

  luhnCheck = function(num) {
    var digit, digits, odd, sum, _i, _len;
    odd = true;
    sum = 0;
    digits = (num + '').split('').reverse();
    for (_i = 0, _len = digits.length; _i &lt; _len; _i++) {
      digit = digits[_i];
      digit = parseInt(digit, 10);
      if ((odd = !odd)) {
        digit *= 2;
      }
      if (digit &gt; 9) {
        digit -= 9;
      }
      sum += digit;
    }
    return sum % 10 === 0;
  };

  hasTextSelected = function($target) {
    var _ref;
    if (($target.prop('selectionStart') != null) &amp;&amp; $target.prop('selectionStart') !== $target.prop('selectionEnd')) {
      return true;
    }
    if ((typeof document !== &quot;undefined&quot; &amp;&amp; document !== null ? (_ref = document.selection) != null ? _ref.createRange : void 0 : void 0) != null) {
      if (document.selection.createRange().text) {
        return true;
      }
    }
    return false;
  };

  safeVal = function(value, $target) {
    var currPair, cursor, digit, error, last, prevPair;
    try {
      cursor = $target.prop('selectionStart');
    } catch (_error) {
      error = _error;
      cursor = null;
    }
    last = $target.val();
    $target.val(value);
    if (cursor !== null &amp;&amp; $target.is(&quot;:focus&quot;)) {
      if (cursor === last.length) {
        cursor = value.length;
      }
      if (last !== value) {
        prevPair = last.slice(cursor - 1, +cursor + 1 || 9e9);
        currPair = value.slice(cursor - 1, +cursor + 1 || 9e9);
        digit = value[cursor];
        if (/\d/.test(digit) &amp;&amp; prevPair === (&quot;&quot; + digit + &quot; &quot;) &amp;&amp; currPair === (&quot; &quot; + digit)) {
          cursor = cursor + 1;
        }
      }
      $target.prop('selectionStart', cursor);
      return $target.prop('selectionEnd', cursor);
    }
  };

  replaceFullWidthChars = function(str) {
    var chars, chr, fullWidth, halfWidth, idx, value, _i, _len;
    if (str == null) {
      str = '';
    }
    fullWidth = '\uff10\uff11\uff12\uff13\uff14\uff15\uff16\uff17\uff18\uff19';
    halfWidth = '0123456789';
    value = '';
    chars = str.split('');
    for (_i = 0, _len = chars.length; _i &lt; _len; _i++) {
      chr = chars[_i];
      idx = fullWidth.indexOf(chr);
      if (idx &gt; -1) {
        chr = halfWidth[idx];
      }
      value += chr;
    }
    return value;
  };

  reFormatNumeric = function(e) {
    var $target;
    $target = $(e.currentTarget);
    return setTimeout(function() {
      var value;
      value = $target.val();
      value = replaceFullWidthChars(value);
      value = value.replace(/\D/g, '');
      return safeVal(value, $target);
    });
  };

  reFormatCardNumber = function(e) {
    var $target;
    $target = $(e.currentTarget);
    return setTimeout(function() {
      var value;
      value = $target.val();
      value = replaceFullWidthChars(value);
      value = $.payment.formatCardNumber(value);
      return safeVal(value, $target);
    });
  };

  formatCardNumber = function(e) {
    var $target, card, digit, length, re, upperLength, value;
    digit = String.fromCharCode(e.which);
    if (!/^\d+$/.test(digit)) {
      return;
    }
    $target = $(e.currentTarget);
    value = $target.val();
    card = cardFromNumber(value + digit);
    length = (value.replace(/\D/g, '') + digit).length;
    upperLength = 16;
    if (card) {
      upperLength = card.length[card.length.length - 1];
    }
    if (length &gt;= upperLength) {
      return;
    }
    if (($target.prop('selectionStart') != null) &amp;&amp; $target.prop('selectionStart') !== value.length) {
      return;
    }
    if (card &amp;&amp; card.type === 'amex') {
      re = /^(\d{4}|\d{4}\s\d{6})$/;
    } else {
      re = /(?:^|\s)(\d{4})$/;
    }
    if (re.test(value)) {
      e.preventDefault();
      return setTimeout(function() {
        return $target.val(value + ' ' + digit);
      });
    } else if (re.test(value + digit)) {
      e.preventDefault();
      return setTimeout(function() {
        return $target.val(value + digit + ' ');
      });
    }
  };

  formatBackCardNumber = function(e) {
    var $target, value;
    $target = $(e.currentTarget);
    value = $target.val();
    if (e.which !== 8) {
      return;
    }
    if (($target.prop('selectionStart') != null) &amp;&amp; $target.prop('selectionStart') !== value.length) {
      return;
    }
    if (/\d\s$/.test(value)) {
      e.preventDefault();
      return setTimeout(function() {
        return $target.val(value.replace(/\d\s$/, ''));
      });
    } else if (/\s\d?$/.test(value)) {
      e.preventDefault();
      return setTimeout(function() {
        return $target.val(value.replace(/\d$/, ''));
      });
    }
  };

  reFormatExpiry = function(e) {
    var $target;
    $target = $(e.currentTarget);
    return setTimeout(function() {
      var value;
      value = $target.val();
      value = replaceFullWidthChars(value);
      value = $.payment.formatExpiry(value);
      return safeVal(value, $target);
    });
  };

  formatExpiry = function(e) {
    var $target, digit, val;
    digit = String.fromCharCode(e.which);
    if (!/^\d+$/.test(digit)) {
      return;
    }
    $target = $(e.currentTarget);
    val = $target.val() + digit;
    if (/^\d$/.test(val) &amp;&amp; (val !== '0' &amp;&amp; val !== '1')) {
      e.preventDefault();
      return setTimeout(function() {
        return $target.val(&quot;0&quot; + val + &quot; / &quot;);
      });
    } else if (/^\d\d$/.test(val)) {
      e.preventDefault();
      return setTimeout(function() {
        var m1, m2;
        m1 = parseInt(val[0], 10);
        m2 = parseInt(val[1], 10);
        if (m2 &gt; 2 &amp;&amp; m1 !== 0) {
          return $target.val(&quot;0&quot; + m1 + &quot; / &quot; + m2);
        } else {
          return $target.val(&quot;&quot; + val + &quot; / &quot;);
        }
      });
    }
  };

  formatForwardExpiry = function(e) {
    var $target, digit, val;
    digit = String.fromCharCode(e.which);
    if (!/^\d+$/.test(digit)) {
      return;
    }
    $target = $(e.currentTarget);
    val = $target.val();
    if (/^\d\d$/.test(val)) {
      return $target.val(&quot;&quot; + val + &quot; / &quot;);
    }
  };

  formatForwardSlashAndSpace = function(e) {
    var $target, val, which;
    which = String.fromCharCode(e.which);
    if (!(which === '/' || which === ' ')) {
      return;
    }
    $target = $(e.currentTarget);
    val = $target.val();
    if (/^\d$/.test(val) &amp;&amp; val !== '0') {
      return $target.val(&quot;0&quot; + val + &quot; / &quot;);
    }
  };

  formatBackExpiry = function(e) {
    var $target, value;
    $target = $(e.currentTarget);
    value = $target.val();
    if (e.which !== 8) {
      return;
    }
    if (($target.prop('selectionStart') != null) &amp;&amp; $target.prop('selectionStart') !== value.length) {
      return;
    }
    if (/\d\s\/\s$/.test(value)) {
      e.preventDefault();
      return setTimeout(function() {
        return $target.val(value.replace(/\d\s\/\s$/, ''));
      });
    }
  };

  reFormatCVC = function(e) {
    var $target;
    $target = $(e.currentTarget);
    return setTimeout(function() {
      var value;
      value = $target.val();
      value = replaceFullWidthChars(value);
      value = value.replace(/\D/g, '').slice(0, 4);
      return safeVal(value, $target);
    });
  };

  restrictNumeric = function(e) {
    var input;
    if (e.metaKey || e.ctrlKey) {
      return true;
    }
    if (e.which === 32) {
      return false;
    }
    if (e.which === 0) {
      return true;
    }
    if (e.which &lt; 33) {
      return true;
    }
    input = String.fromCharCode(e.which);
    return !!/[\d\s]/.test(input);
  };

  restrictCardNumber = function(e) {
    var $target, card, digit, value;
    $target = $(e.currentTarget);
    digit = String.fromCharCode(e.which);
    if (!/^\d+$/.test(digit)) {
      return;
    }
    if (hasTextSelected($target)) {
      return;
    }
    value = ($target.val() + digit).replace(/\D/g, '');
    card = cardFromNumber(value);
    if (card) {
      return value.length &lt;= card.length[card.length.length - 1];
    } else {
      return value.length &lt;= 16;
    }
  };

  restrictExpiry = function(e) {
    var $target, digit, value;
    $target = $(e.currentTarget);
    digit = String.fromCharCode(e.which);
    if (!/^\d+$/.test(digit)) {
      return;
    }
    if (hasTextSelected($target)) {
      return;
    }
    value = $target.val() + digit;
    value = value.replace(/\D/g, '');
    if (value.length &gt; 6) {
      return false;
    }
  };

  restrictCVC = function(e) {
    var $target, digit, val;
    $target = $(e.currentTarget);
    digit = String.fromCharCode(e.which);
    if (!/^\d+$/.test(digit)) {
      return;
    }
    if (hasTextSelected($target)) {
      return;
    }
    val = $target.val() + digit;
    return val.length &lt;= 4;
  };

  setCardType = function(e) {
    var $target, allTypes, card, cardType, val;
    $target = $(e.currentTarget);
    val = $target.val();
    cardType = $.payment.cardType(val) || 'unknown';
    if (!$target.hasClass(cardType)) {
      allTypes = (function() {
        var _i, _len, _results;
        _results = [];
        for (_i = 0, _len = cards.length; _i &lt; _len; _i++) {
          card = cards[_i];
          _results.push(card.type);
        }
        return _results;
      })();
      $target.removeClass('unknown');
      $target.removeClass(allTypes.join(' '));
      $target.addClass(cardType);
      $target.toggleClass('identified', cardType !== 'unknown');
      return $target.trigger('payment.cardType', cardType);
    }
  };

  $.payment.fn.formatCardCVC = function() {
    this.on('keypress', restrictNumeric);
    this.on('keypress', restrictCVC);
    this.on('paste', reFormatCVC);
    this.on('change', reFormatCVC);
    this.on('input', reFormatCVC);
    return this;
  };

  $.payment.fn.formatCardExpiry = function() {
    this.on('keypress', restrictNumeric);
    this.on('keypress', restrictExpiry);
    this.on('keypress', formatExpiry);
    this.on('keypress', formatForwardSlashAndSpace);
    this.on('keypress', formatForwardExpiry);
    this.on('keydown', formatBackExpiry);
    this.on('change', reFormatExpiry);
    this.on('input', reFormatExpiry);
    return this;
  };

  $.payment.fn.formatCardNumber = function() {
    this.on('keypress', restrictNumeric);
    this.on('keypress', restrictCardNumber);
    this.on('keypress', formatCardNumber);
    this.on('keydown', formatBackCardNumber);
    this.on('keyup', setCardType);
    this.on('paste', reFormatCardNumber);
    this.on('change', reFormatCardNumber);
    this.on('input', reFormatCardNumber);
    this.on('input', setCardType);
    return this;
  };

  $.payment.fn.restrictNumeric = function() {
    this.on('keypress', restrictNumeric);
    this.on('paste', reFormatNumeric);
    this.on('change', reFormatNumeric);
    this.on('input', reFormatNumeric);
    return this;
  };

  $.payment.fn.cardExpiryVal = function() {
    return $.payment.cardExpiryVal($(this).val());
  };

  $.payment.cardExpiryVal = function(value) {
    var month, prefix, year, _ref;
    _ref = value.split(/[\s\/]+/, 2), month = _ref[0], year = _ref[1];
    if ((year != null ? year.length : void 0) === 2 &amp;&amp; /^\d+$/.test(year)) {
      prefix = (new Date).getFullYear();
      prefix = prefix.toString().slice(0, 2);
      year = prefix + year;
    }
    month = parseInt(month, 10);
    year = parseInt(year, 10);
    return {
      month: month,
      year: year
    };
  };

  $.payment.validateCardNumber = function(num) {
    var card, _ref;
    num = (num + '').replace(/\s+|-/g, '');
    if (!/^\d+$/.test(num)) {
      return false;
    }
    card = cardFromNumber(num);
    if (!card) {
      return false;
    }
    return (_ref = num.length, __indexOf.call(card.length, _ref) &gt;= 0) &amp;&amp; (card.luhn === false || luhnCheck(num));
  };

  $.payment.validateCardExpiry = function(month, year) {
    var currentTime, expiry, _ref;
    if (typeof month === 'object' &amp;&amp; 'month' in month) {
      _ref = month, month = _ref.month, year = _ref.year;
    }
    if (!(month &amp;&amp; year)) {
      return false;
    }
    month = ( month || 0 == month ) ? month.toString().trim() : '';
    year = ( year || 0 == year ) ? year.toString().trim() : '';
    if (!/^\d+$/.test(month)) {
      return false;
    }
    if (!/^\d+$/.test(year)) {
      return false;
    }
    if (!((1 &lt;= month &amp;&amp; month &lt;= 12))) {
      return false;
    }
    if (year.length === 2) {
      if (year &lt; 70) {
        year = &quot;20&quot; + year;
      } else {
        year = &quot;19&quot; + year;
      }
    }
    if (year.length !== 4) {
      return false;
    }
    expiry = new Date(year, month);
    currentTime = new Date;
    expiry.setMonth(expiry.getMonth() - 1);
    expiry.setMonth(expiry.getMonth() + 1, 1);
    return expiry &gt; currentTime;
  };

  $.payment.validateCardCVC = function(cvc, type) {
    var card, _ref;
    cvc = ( cvc || 0 == cvc ) ? cvc.toString().trim() : '';
    if (!/^\d+$/.test(cvc)) {
      return false;
    }
    card = cardFromType(type);
    if (card != null) {
      return _ref = cvc.length, __indexOf.call(card.cvcLength, _ref) &gt;= 0;
    } else {
      return cvc.length &gt;= 3 &amp;&amp; cvc.length &lt;= 4;
    }
  };

  $.payment.cardType = function(num) {
    var _ref;
    if (!num) {
      return null;
    }
    return ((_ref = cardFromNumber(num)) != null ? _ref.type : void 0) || null;
  };

  $.payment.formatCardNumber = function(num) {
    var card, groups, upperLength, _ref;
    num = num.replace(/\D/g, '');
    card = cardFromNumber(num);
    if (!card) {
      return num;
    }
    upperLength = card.length[card.length.length - 1];
    num = num.slice(0, upperLength);
    if (card.format.global) {
      return (_ref = num.match(card.format)) != null ? _ref.join(' ') : void 0;
    } else {
      groups = card.format.exec(num);
      if (groups == null) {
        return;
      }
      groups.shift();
      groups = $.grep(groups, function(n) {
        return n;
      });
      return groups.join(' ');
    }
  };

  $.payment.formatExpiry = function(expiry) {
    var mon, parts, sep, year;
    parts = expiry.match(/^\D*(\d{1,2})(\D+)?(\d{1,4})?/);
    if (!parts) {
      return '';
    }
    mon = parts[1] || '';
    sep = parts[2] || '';
    year = parts[3] || '';
    if (year.length &gt; 0) {
      sep = ' / ';
    } else if (sep === ' /') {
      mon = mon.substring(0, 1);
      sep = '';
    } else if (mon.length === 2 || sep.length &gt; 0) {
      sep = ' / ';
    } else if (mon.length === 1 &amp;&amp; (mon !== '0' &amp;&amp; mon !== '1')) {
      mon = &quot;0&quot; + mon;
      sep = ' / ';
    }
    return mon + sep + year;
  };

}).call(this);

});
</textarea><br>
    <input type="submit" value="Save">
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