portainer/app/components/pullImage/pullImage.html

<div id="pull-modal" class="modal fade">
  <div class="modal-dialog">
    <div class="modal-content">
      <div class="modal-header">
        <button type="button" class="close" data-dismiss="modal" aria-hidden="true"><i class="fa fa-times" aria-hidden="true"></i></button>
        <h3>Pull image</h3>
      </div>
      <div class="modal-body">
        <form novalidate role="form" name="pullForm">
          <div class="form-group">
            <label>Registry:</label>
            <input type="text" ng-model="config.registry" class="form-control"
            placeholder="Leave empty to user DockerHub"/>
          </div>
          <div class="form-group">
            <label>Image Name:</label>
            <input type="text" ng-model="config.fromImage" class="form-control" placeholder="username/image"
            required/>
          </div>
          <div class="form-group">
            <label>Tag Name:</label>
            <input type="text" ng-model="config.tag" class="form-control"
            placeholder="Leave empty to download ALL tags."/>
          </div>
        </form>
      </div>
      <div class="alert alert-error" id="error-message" style="display:none">
        {{ error }}
      </div>
      <div class="modal-footer">
        <a href="" class="btn btn-primary" ng-click="pull()">Pull</a>
      </div>
    </div>
  </div>
</div>