yii2: how to send a model from a create form to the controller

Question

I have a dropdownlist in my form:

<?= Html::activeDropDownList($model, 'Id_tipoprograma',
  ArrayHelper::map(Tipoprograma::find()->all(), 'Id_tipoprograma', 'Id_tipoprograma', 'Descripcion'))?>

i want to receive "Id_tipoprograma" in the controller, i tried with:

$idtp = $model->Id_tipoprograma;    

But doesn't work. thanks.

Answer 1

First read docs here and here. Normally you should get form data in Yii::$app->request->post() or Yii::$app->request->get()