How to make a drop down list in yii2?

Question

How to make a dropdown in yii2 using an activeform and a model? Since all the methods has changed in yii2,how it is done in the new one?

Answer 1

It is like

<?php use yii\helpers\ArrayHelper; use backend\models\Standard; ?>  <?= Html::activeDropDownList($model, 's_id',       ArrayHelper::map(Standard::find()->all(), 's_id', 'name')) ?> 

ArrayHelper in Yii2 replaces the CHtml list data in Yii 1.1.[Please load array data from your controller]

EDIT

Load data from your controller.

Controller

$items = ArrayHelper::map(Standard::find()->all(), 's_id', 'name'); ... return $this->render('your_view',['model'=>$model, 'items'=>$items]); 

In View

<?= Html::activeDropDownList($model, 's_id',$items) ?>