gistfile1.txt

<div ng-controller="UploadOptionController">
      <!-- $scope must have a method fromFile that receives the content -->
      <!-- $scope.fromFile = function(content) { ... }
      <div>
      <label>Separator</label>
      <input type="text" ng-model="upload.needle" name="needle">
      <div>
      
      <input class="hide" type="file" ng-model="upload.file" name="file"
          onchange="angular.element(this).scope().upload.load().then(angular.element(this).scope().fromFile)">
      <button class="md-button md-raised md-primary" aria-label="From file"
          ng-click="upload.open($event, 'csv,txt')">
          <span translate>From file</span>
      </button>

      <div>
          <small class="info">
              TXT or CSV only with columns label and value separated by coma
          </small>
      </div>
  </div>