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

Answer 1

It Seems there are many good answers for this question .So i will try to give a detailed answer

active form and hardcoded data

field($model, 'name')->dropDownList(['1' => 'Yes', '0' => 'No'],['prompt'=>'Select Option']);
?>

or

 'Yes', '0' => 'No'];
    echo $form->field($model, 'name')->dropDownList($a,['prompt'=>'Select Option']);
?>

active form and data from a db table

we are going to use ArrayHelper so first add it to the name space by

ArrayHelper has many use full functions which could be used to process arrays map () is the one we are going to use here this function help to make a map ( of key-value pairs) from a multidimensional array or an array of objects.

field($model, 'name')->dropDownList(ArrayHelper::map(User::find()->all(),'id','username'),['prompt'=>'Select User']);
?>

not part of a active form

 'Yes', '0' => 'No']) ;
?>

or

 'Yes', '0' => 'No'];
    echo Html::activeDropDownList($model, 'filed_name',$a) ;
?>

not an active form but data from a db table

all(),'id','username'),['prompt'=>'Select User']);
?>