Yii 2: Ajax + Delete

index.php

<?php Pjax::begin(['id' => 'pjax-container']) ?>
    <?= GridView::widget([
        'dataProvider' => $dataProvider,
        'filterModel' => $searchModel,
        'columns' => [
            // ...
            [
                'class' => 'yii\grid\ActionColumn',
                'buttons' => [
                    'delete' => function ($url) {
                        return Html::a('<span class="glyphicon glyphicon-trash"></span>', '#', [
				'title' => Yii::t('yii', 'Delete'),
				'aria-label' => Yii::t('yii', 'Delete'),
				'class' => ['btn btn-sm btn-danger'],
				'onclick' => "
					krajeeDialog.confirm('". Yii::t('kvgrid', 'Are you sure to delete this item?') ."', function (result) {
					if (result) {
						$.ajax('$url', {
							type: 'POST'
						}).done(function(data) {
							$.pjax.reload({container: '#kv-pjax-container'});
						});
					}                               
					});
				",
			]);
                    },
                ],
            ],
        ],
    ]); ?>
<?php Pjax::end() ?>

PostController.php

<?php
class PostController extends Controller
{
    // ...
    public function actionDelete($id)
    {
        $this->findModel($id)->delete();

        if (!Yii::$app->request->isAjax) {
            return $this->redirect(['index']);
        }
    }
}