dependent dropdown yii2. How to do?

Question

can I create a dependent dropdown in yii2?

I have two tables:

\'id\',\'name_country\"
\'id\',\'name_city\',\'country_id\'

and have

Answer 1

The above code is not working properly. There is an error in the line

$.post("'.Yii::$app->urlManager->createUrl('city/lists&id=').'"+$(this).val(),function( data ) 

console shows the error : Not Found (#404): Unable to resolve the request: subcategory/lists&id=54

is there any solution for this my controller looks like below

public function actionLists($id)
      {
         $posts = SubCategory::find()
         ->where(['category_id' => $id])
         ->orderBy('id DESC')
         ->all();

         if($posts){
         foreach($posts as $post){

         echo "".$post->name."";
         }
         }
         else{
         echo "-";
         }

    }

when i remove the id from the url and hard coded it in to controller it works properly.

I have find a solution for this please change your view as follows

 field($model, 'category_id')->dropDownList($data,['prompt'=>'-Choose a Category-',

                                                            'onchange'=>'
             $.get( "'.Url::toRoute('product/catlists').'", { id: $(this).val() } )
                            .done(function( data )
                   {
                              $( "select#product-sub_categoryid" ).html( data );
                            });
                        ']); ?> 

and controller like this

public function actionCatlists($id)
    {
        $mymodel = new Product ();
        $size = $mymodel->modelGetCategory ( 'product_sub_category',$id );
        if($size){
            echo 'Choose Sub category';
            foreach($size as $post){
                echo "".$post['name']."";
            }
        }
        else{
            echo 'Not Specified';
        }

    }

don't forget to include this on your view

use yii\helpers\Url;