怎么样使用Yii2实现ajax上传图片插件？

public function actionCreate()
{
 $model = new DynamicModel([
  'nama', 'file_id'
  ]);
 // behavior untuk upload file
 $model->attachBehavior('upload', [
  'class' => 'mdm\upload\UploadBehavior',
  'attribute' => 'file',
  'savedAttribute' => 'file_id' // coresponding with $model->file_id
 ]);
 // rule untuk model
 $model->addRule('nama', 'string')
  ->addRule('file', 'file', ['extensions' => 'jpg']);
 if ($model->load(Yii::$app->request->post()) && $model->validate()) {
  if ($model->saveUploadedFile() !== false) {
   Yii::$app->session->setFlash('success', 'Upload Sukses');
  }
 }
 return $this->render('upload',['model' => $model]);
}

<?php
use yii\helpers\Html;
use yii\widgets\ActiveForm;
/* @var $this yii\web\View */
?>
<div>
 <?php
 $form = ActiveForm::begin([
   'options' => [ 'enctype' => 'multipart/form-data']
 ]);
 ?>
 <?= $form->field($model, 'nama'); ?>
 <?= $form->field($model, 'file')->fileInput(); ?>
 <?php if ($model->file_id): ?>
  <div class="form-group">
   <?= Html::img(['/file', 'id' => $model->file_id]) ?>
  </div>
 <?php endif; ?>
 <div class="form-group">
  <?= Html::submitButton('Submit', ['class' => 'btn btn-primary']) ?>
 </div>
 <?php ActiveForm::end(); ?>
</div>