Delete multiple di yii2

//Di view

//tambahkan
use kartik\grid\GridView;
use yii\widgets\Pjax;

//ganti bagian gridview::widgets jadi kayak gini
    <?= GridView::widget([
        'dataProvider' => $dataProvider,
        'filterModel' => $searchModel,
        'pjax'=>true,           //<== ketambahan ini
        'pjaxSettings'=>[       //<== ketambahan ini
            'neverTimeout'=>true,
        ],
        'columns' => [
            ['class' => 'yii\grid\SerialColumn'],

            'username',
            'nama',

            ['class' => 'yii\grid\ActionColumn'],
            ['class' => 'kartik\grid\CheckboxColumn']   //<== ketambahan ini
        ],
    ]); ?>

//Tambahkan button
    <p>
        <?= Html::submitButton('Hapus',
            ['class' => 'btn btn-success', 'id' => 'delButton']
        ) ?>
    </p>

//Tambahkan javascript di view
<?php $script = <<< JS
    $('#delButton').click(function(){
            $.post(
                "users/delete-multiple",
                {
                    pk : $('#w0').yiiGridView('getSelectedRows') //w0 adalah id dari gridnya
                },
                function () {
                    $.pjax.reload({container:'#w0-pjax'}); //w0-pjax adalah id dari Pjax (diatasnya id grid)
                }
            );
        });
JS;
$this->registerJs($script);
?>


//di controller tambahkan
    public function actionDeleteMultiple()
    {
        $pk = Yii::$app->request->post('pk'); // Array or selected records primary keys

        // Preventing extra unnecessary query
        if (!$pk) {
            return;
        }

        return Users::deleteAll(['id' => $pk]);
    }

/*
Sumber:
http://demos.krajee.com/grid#checkbox-column
http://demos.krajee.com/grid#default-export-config <== jika ada error pdf, search aja pdf di sini, hapus pdf di export config nya
http://stackoverflow.com/questions/30180492/yii2-kartik-gridview-disable-pdf-export <== ini yang menangani eror pdf
http://stackoverflow.com/questions/27397588/yii-2-how-to-bulk-delete-data-in-kartik-grid-view <== referensi ajax buat delete
*/