Kartik editable fails to update the value on the gridview

Am using kartik editable grid column , the data is updated successifully on the server database but on the grid view its not.

The editable column doesnt refresh the value on the grid view but when i refresh the page manually the value is there

This is my code:

        if (Yii::$app->request->post('hasEditable')) {
        // instantiate your book model for saving
        $truckid = Yii::$app->request->post('editableKey');
        $model = Truck::findOne($truckid);

        $out = Json::encode(['output'=>'', 'message'=>'']);

        $posted = current($_POST['Truck']);
        $post = ['Truck' => $posted];

        // load model like any single model validation
        if ($model->load($post)) {
            // can save model or do something before saving model

            $model->save();
            $output = '';
            if (isset($posted['reg_no'])) {
            $output = $posted['reg_no'];
         }

            $out = Json::encode(['output'=>$output, 'message'=>'successifully saved']);
        }
        // return ajax json encoded response and exit
        echo $out;
        return;
    }

This is my grid view code:

[
    'class'=>'kartikgridEditableColumn',
    'attribute' => 'reg_no',
    'header' => 'Truck registration number',
    'editableOptions'=>[
        'formOptions' => ['action' => ['truckyard']],
        'header'=>'Registration number',
        'inputType'=>Editable::INPUT_TEXTAREA,
        //'options'=>['mask' => 'aaa-999a']

    ],
    'hAlign'=>'left',
    'vAlign'=>'middle',
    'filterType'=>GridView::FILTER_SELECT2,
    'filter'=>ArrayHelper::map(Truck::find()->orderBy('id')->asArray()->all(), 'id', 'reg_no'),
    'filterWidgetOptions'=>[
        'pluginOptions'=>['allowClear'=>true],
    ],
    'filterInputOptions'=>['placeholder'=>'Select truck'],
    'format'=>'raw'

],

What could be wrong