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Yii2 . FORM How to make dependant drop down. Where second drop downs values are dependant on first drop down selection

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In form file :



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<?= $form->field($model, 'country_id')->dropDownList(["5"=>'USA', "6"=>"Pakistan"],
        ['prompt'=>'Select Country',
            'onchange'=>'
                $.get( "'.\yii\helpers\Url::toRoute('/site/getstates').'", { id: $(this).val() } )
                      .done(function( data ) {
                                $( "#'.Html::getInputId($model, 'state_id').'" ).html( data );
                            }
                        );
            ','class' => 'form-control'
        ]
    ); ?>
    <?= $form->field($model, 'state_id')
        ->dropDownList(
            [
                'prompt'=>'Select State',
            ]
        );
    ?>





In siteController.php file add a function like below:




public function actionGetstates($id){
        $states = StateProvince::find()->where(
            [
                'country_id'=>$id
            ]
        )->all();

        $returnStr = "";
        foreach ($states as $state){
            $returnStr.="<option value='{$state->state_id}'>{$state->name}</option>";
        }

        return $returnStr;
    }


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