Yii2: Conditional Validator always returns required

Question

I am trying to use Yii2\'s conditional validator as given in the guide like:

Model code

public function rules()
{
   // $discharged = function($model) {          


        

Answer 1

This only worked for me when using the model name (client validation).

['state', 'required', 'when' => function ($model) {
  return $model->country == 'USA';
}, 'whenClient' => "function (attribute, value) {
  return $('#MODELNAMEHERE-country').val() == 'USA';
}"]