jquery - how to update a dependent dropdown like create data in yii2 -

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i add code, code select sub category dropdown notwork on upadte page worked on create page. how this

<?php  $coursescat = arrayhelper::map(coursescat::find()->all(),'id', 'cat_name');   $form = activeform::begin(['options' => ['enctype' => 'multipart/form-data']]);    if($model->isnewrecord)  {  echo $form->field($model, 'cat_id')->dropdownlist($coursescat,           ['prompt'=>'-choose category-',           'onchange'=>'             $.post( "'.urldecode(yii::$app->urlmanager->createurl('coursedetail/lists&id=')).'"+$(this).val(), function( data ) {               $( "select#subcat_id" ).html( data );             });         ']);     echo $form->field($model, 'subcat_id')     ->dropdownlist(                    ['prompt'=>'-choose sub category-'],         ['id'=>'subcat_id']     );  } else {   echo $form->field($model, 'cat_id')->dropdownlist($coursescat,           ['prompt'=>'-choose category-',           'onchange'=>'             $.post( "'.urldecode(yii::$app->urlmanager->createurl('coursedetail/lists&id=')).'"+$(this).val(), function( data ) {               $( "select#subcat_id" ).html( data );             });         ']);     echo $form->field($model, 'subcat_id')     ->dropdownlist(                    ['prompt'=>'-choose sub category-'],         ['id'=>'subcat_id']     );    }  } ?>   <div class="form-group">     <?= html::submitbutton($model->isnewrecord ? 'create' : 'update', ['class' => $model->isnewrecord ? 'btn btn-success' : 'btn btn-primary']) ?> </div>  <?php activeform::end(); ?>

in controller

public function actionlists($id) {    echo $sql = "select * courses_subcat  cat_id='$id' ";     $models = coursessubcat::findbysql($sql)->asarray()->all();        //echo "<pre>";print_r($model);exit;      if(sizeof($models) >0){         echo "<option>-choose sub category-</option>";         foreach($models $model){             echo "<option value='".$model['id']."'>".$model['name']."</option>";         }     }     else{         echo "<option>-choose sub category-</option><option></option>";     }  }

you using yii 2. can use kartik dependent dropdown. easy implement. please read docs here http://plugins.krajee.com/dependent-dropdown

here demo :- http://plugins.krajee.com/dependent-dropdown/demo


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