jquery - Automatically Determine Credit Card Type -

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i'm trying automatically determine credit card type. code below works, not on mobile. i've tried finding solution mobile, i'm unable @ time.

here's jquery:

(function($) {    $.getcreditcardtype = function(val) {      if(!val || !val.length) return undefined;      switch(val.charat(0)) {        case '4': return 'visa';        case '5': return 'mastercard';        case '3': return 'amex';        case '6': return 'discover';      };      return undefined;    };    $.fn.creditcardtype = function(options) {      var settings = {          target: '#credit-card-type',      };      if(options) {          $.extend(settings, options);      };      var keyuphandler = function() {        $("#credit-card-type li").removeclass("active");        $("input[id=authorizenet_cc_type]").val('');        switch($.getcreditcardtype($(this).val())) {          case 'visa':           $('#credit-card-type .vi').addclass('active');           $("input[id=authorizenet_cc_type]").val('vi');            break;          case 'mastercard':           $('#credit-card-type .mc').addclass('active');           $("input[id=authorizenet_cc_type]").val('mc');            break;          case 'amex':            $('#credit-card-type .ae').addclass('active');            $("input[id=authorizenet_cc_type]").val('ae');            break;          case 'discover':            $('#credit-card-type .di').addclass('active');           $("input[id=authorizenet_cc_type]").val('di');            break;        };      };      return this.each(function() {        $(this).bind('keyup',keyuphandler).trigger('keyup');      });    }; })(jquery);

answer: added

<script src="http://code.jquery.com/mobile/1.3.2/jquery.mobile-1.3.2.min.js"></script>

i give credit scott provided.

have tried using keypress instead of keyup?

$(this).keypress(function() {  });

or using input event of input field monitoring?

$(this).on('input', function() {  });

edit - answering question

i wasn't sure going on in code out of context. changed few things in scoping things working.

first off, going assume html looks this.

<ul id="credit-card-type">     <li>         <form>         <input type="text" id="credit-card-type" />         <input type="text" id="authorizenet_cc_type" />         </form>     </li> </ul>

then js using input event

     var getcreditcardtype = function(val) {         if(!val || !val.length) return undefined;         switch(val.charat(0)) {             case '4': return 'visa';             case '5': return 'mastercard';             case '3': return 'amex';             case '6': return 'discover';         }         return undefined;     }         var keyuphandler = function() {          console.log('test')        $("#credit-card-type li").removeclass("active");        $("input[id=authorizenet_cc_type]").val('');        switch(getcreditcardtype($(this).val())) {          case 'visa':           $('#credit-card-type .vi').addclass('active');           $("input[id=authorizenet_cc_type]").val('vi');            break;          case 'mastercard':           $('#credit-card-type .mc').addclass('active');           $("input[id=authorizenet_cc_type]").val('mc');            break;          case 'amex':            $('#credit-card-type .ae').addclass('active');            $("input[id=authorizenet_cc_type]").val('ae');            break;          case 'discover':            $('#credit-card-type .di').addclass('active');           $("input[id=authorizenet_cc_type]").val('di');            break;        };      };        $('input#credit-card-type').on('input',keyuphandler);

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