'buttons' => [
 'update' => function ($url, $model, $key) {
 return Html::a('<span class="glyphicon glyphicon-pencil"></span>', '#', [
 'data-toggle' => 'modal',
 'data-target' => '#update-modal',
 'class' => 'data-update',
 'data-id' => $key,
 'title'=>'更改狀態(tài)',
 ]);
 },
 ], 

<?php
use yii\bootstrap\Modal;//模態(tài)彈出框
Modal::begin([
 'id' => 'update-modal',
 'header' => '<h4 class="modal-title">更改狀態(tài)</h4>',
 'footer' => '<a href="#" rel="external nofollow" class="btn btn-primary" data-dismiss="modal">Close</a>',
]); 
Modal::end();
?>

<?php 
$requestUpdateUrl = Url::toRoute('update');
$updateJs = <<<JS
 $('.data-update').on('click', function () {
 $.get('{$requestUpdateUrl}', { id: $(this).closest('tr').data('key') },
 function (data) {
 $('.modal-body').html(data);
 } 
 );
 });
JS;
$this->registerJs($updateJs); 
?>

 public function actionUpdate($id)
{
 $model = Order_packet::findOne($id);
 $model->setScenario('update');//指定場景，防止時間等變量同時被更改
 if ($model->load(Yii::$app->request->post()) && $model->save()) {
 return $this->redirect(['index']);
 } else {
 return $this->renderAjax('update', [ //這里需要渲染update模版，要在view中寫update
 'model' => $model,
 ]);
 }
}