FileReader - AngularJS service wrapper for window.FileReader

FileReader

app.factory('FileReader', function($q, $window) {

    if (!$window.FileReader) {
      throw new Error('Browser does not support FileReader');
    }

    function readAsDataUrl(file) {
      var deferred = $q.defer(),
        reader = new $window.FileReader();

      reader.onload = function() {
        deferred.resolve(reader.result);
      };

      reader.onerror = function() {
        deferred.reject(reader.error);
      };

      reader.readAsDataURL(file);

      return deferred.promise;
    }

    return {
      readAsDataUrl: readAsDataUrl
    };
  });