How to get article content via AJAX?

Question

Yii

Hello! Articles are displayed cyclically on the site, you need to create an AJAX request that would display more detailed content in popUp. Please help me figure this out. How to create a request in general and display it back? In the current state, I receive an object - how to parse it, if this is correct at all?

$.ajax({
            url: '/category/data',
            data: {productId:productId},
            type: 'GET',
            success: function(res){
                alert(res)

            },
            error: function(){
                alert('Error!');
            }
        });

public function actionData($productId){
        if (Yii::$app->request->isAjax) {

            $res = Product::find()->where(['id'=> $productId])->one();
            \Yii::$app->response->format = \yii\web\Response::FORMAT_JSON;
            return ['res'=> $res];
        }
    }

Answer 1

Just replace

success: function(res){
                alert(res)

            },

on the

success: function(res){
                console.log(res)

            },

and before calling open developer console (F12)