Yii2 - Dropdownlist to load other attributes - yii2

Question

I have this Model Class
public function attributeLabels()
{
return [
'id' => Yii::t('course', 'ID'),
'course_code' => Yii::t('course', 'Course Code'),
'course_type' => Yii::t('course', 'Course Type'),
'course_title' => Yii::t('course', 'Course Title'),
'course_unit' => Yii::t('course', 'Course Unit'),
];
}
On Dropdownlist change, I want to load and display course_code, course_type, course_title, and course_unit. But should only save course_title. The other should only be displayed and not save, except course_title.
Am ableto display only course_title. This is my view for the dropdown list.
<?= $form->field($modelDetail, "course_id")->widget(Select2::classname(), [
'data' => ArrayHelper::map(app\modules\course\models\CourseMaster::find()->where(['is_status'=>0])->all(),'id','course_title'),
'language' => 'en',
'options' => ['placeholder' => '--- Select Course ---',
],
'pluginOptions' => [
'allowClear' => true
],
]); ?>
This is what I have done.
But I want to achieve this.
How do I display other attributes as textInput() or label without saving in database. Thanks
Controller
public function actionCreate()
{
$modelDetail = new CourseMaster();
if (Yii::$app->request->isAjax && $modelDetail->load(Yii::$app->request->post())) {
\Yii::$app->response->format = \yii\web\Response::FORMAT_JSON;
return ActiveForm::validate($modelDetail);
}
if ($modelDetail->load(Yii::$app->request->post())) {
$modelDetail->attributes = $_POST['CourseMaster'];
if($modelDetail->save())
return $this->redirect(['index']);
else
return $this->render('create', ['modelDetail' => $modelDetail,]);
} else {
return $this->render('create', [
'modelDetail' => $modelDetail,
]);
}
}

Answer 1

If you want to only display other fields without sending it on form submit, you can mark field as disabled:
<?= $form->field($modelDetail, 'course_code')->textInput([
'disabled' => true,
]) ?>
This will render input which cannot be edited directly and it will not be sent on form submit.

Answer 2

Well You can concat the data in the label of dropdown itself, will be an easier option. Use closure on the third argument in ArrayHelper::map($array, $from, $to, $group = null) as follows.
ArrayHelper::map(
app\modules\course\models\CourseMaster::find()->where(['is_status'=>0])->all(),
'id',
function($model){
return $model['course_title']." - ".$model['course_code'];
}
)