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Provide option to get blob instead of Base64 URL

See original GitHub issue

In iOS Safari when I choose a file, crop it, and submit using Croppie, a message appears saying “A problem occurred with this webpage so it was reloaded” and a prompt saying “Are you sure you want to submit this form again?” appears, often resulting in the same message appearing, and sometimes it just submits the form and works. In all other browsers I’ve tried, Android, Chrome, etc., it has worked just fine.

My javascript is based off of the examples on http://foliotek.github.io/Croppie/

Javascript code (imageupload.js):

$( document ).ready(function() {
   var $uploadCrop;

   function readFile(input) {
      if (input.files && input.files[0]) {
         var reader = new FileReader();
         reader.onload = function (e) {
            $uploadCrop.croppie('bind', {
               url: e.target.result
            });
            $('.upload-demo').addClass('ready');
         }
         reader.readAsDataURL(input.files[0]);
      }
   }

   $uploadCrop = $('#upload-demo').croppie({
      viewport: {
         width: 530,
         height: 300,
         type: 'square'
      },
      boundary: {
         width: 600,
         height: 370
      }
   });

   $('#upload').on('change', function () { readFile(this); });
   $('.upload-result').on('click', function (ev) {
      $uploadCrop.croppie('result', {
         type: 'canvas',
         size: 'original'
      }).then(function (resp) {
         $('#image-data').val(resp);
         $('#form').submit();
      });
   });

});

html code (upload.html):

<html>
   <head>
      <title>upload</title>
      <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.0/jquery.min.js"></script>
      <script src="node_modules/croppie/croppie.js"></script>
      <script src="imageupload.js"></script>
      <link rel="stylesheet" href="node_modules/croppie/croppie.css" />
   </head>
   <body>

      <form enctype="multipart/form-data" action="/handleupload/" id="form" method="post">
         <input type="file" id="upload" value="Choose a file">
         <div id="upload-demo"></div>
         <input type="hidden" id="image-data" name="image-data">
         <a href="#" class="upload-result">Send</a>
      </form>

   </body>
</html>

Am I doing this correctly?