View: Add: use kartik\grid\GridView; in GridView::widget add this [ ‘class’=>’kartik\grid\EditableColumn’, ‘attribute’=> ‘your_attribute’, ], Controller Add: use yii\helpers\Json; In Index action…
‘priority’ => [ ‘attribute’ => ‘priority’, ‘filter’ => FALSE, ‘contentOptions’ => function ($model) { return [‘class’ => strtolower($model->priority)]; }, ],