gistfile1.txt

// view index.php

<?php
use yii\helpers\Html;
use yii\grid\GridView;
use yii\widgets\Pjax;
use yii\helpers\Url;
?>
<div class="category-index">
	
    <h1><?= Html::encode($this->title) ?></h1>	
	<?php Pjax::begin(['timeout'=>false,'id'=>'gridview']); ?>
    <?= GridView::widget([
        'dataProvider' => $dataProvider,
        'filterModel' => $searchModel,
        'columns' => [
            ...
        ],
    ]); ?>
	<?php Pjax::end() ?>
</div>
<?php
$this->registerJs('
	var currentData = "";	
	var source = new EventSource("'.Url::to(['category/check']).'");
	source.addEventListener("message", function(event) {
		var data = JSON.parse(event.data);
		console.log(data.lastId)
		if(currentData!=data.lastId){			
			currentData = data.lastId;	
			$.pjax({
				url:"'.Url::to(['category/index']).'",
				container:"#gridview",
				timeout:false,
				push: false,
			}).done(function(data) { 
			});
		}
	}, false);
');

// Controller
<?php
namespace app\controllers;
...
class CategoryController extends Controller
{
    ...
	
    public function actionIndex()
    {
        $searchModel = new CategorySearch();
        $dataProvider = $searchModel->search(Yii::$app->request->queryParams);
		$dataProvider->getSort()->defaultOrder = ['id'=>SORT_DESC];
		if(Yii::$app->request->isAjax){
			return $this->renderAjax('index', [
				'searchModel' => $searchModel,
				'dataProvider' => $dataProvider,
			]);	
		}
		else{
			return $this->render('index', [
				'searchModel' => $searchModel,
				'dataProvider' => $dataProvider,
			]);	
		}
    }
	
	public function actionCheck()
	{
		header('Content-Type: text/event-stream');
		header('Cache-Control: no-cache');
		//echo "retry: 10000\n"; // Optional. We tell the browser to retry after 10 seconds
		$category = Category::find()->select('id')->orderBy('id DESC')->one();
		echo = "data: {\"lastId\": \"".$category->id."\"}\n\n";
		flush();
	}
}