angular upload file

// upload list of files
$scope.onFileSelect = function ($files) {
  //$files: an array of files selected, each file has name, size, and type.
  for (var i = 0; i < $files.length; i++) {
    $scope.uploading = {};
    var file = $files[i];
    var upload_data = {
      url: apiBase,
      method: 'POST',
      headers: {'X-CSRFToken': CSRF.token() },
      file: file
    };
 
    var progress = function (evt) {
      $scope.uploading.percent = parseInt(100.0 * evt.loaded / evt.total);
    };
 
    var success = function (data, status, headers, config) {
      // file is uploaded successfully
      loadItems($scope.pagination.page, $scope.pagination.limit);
      loadMediaTypes();
      $scope.uploading = false;
    };
 
    var error = function(data, status) {
      Alert.push(Alert.type.danger, 'Your files could not be uploaded at this time, please try again later');
      $scope.uploading = false;
    };
 
    $scope.upload = $upload.upload(upload_data).progress(progress).success(success).error(error);
  }
};