How to make a modal window open on page load (Yii2, bootstrap)?

Question

Yii

I set the modal window using the bootstrap extension for yii2. It looks like this:

$modal = Modal::begin([
'header' => '<h2>Модальное окно</h2>',
'toggleButton' => ['label' => 'открыть окно','class' => 'btn btn-default'],
]);
Modal::end();

How can I make the modal open on page load?
Decision:

$modal = Modal::begin([
'header' => '<h2>Модальное окно</h2>',
'toggleButton' => ['label' => 'открыть окно','class' => 'btn btn-default'],
'clientOptions' => ['show' => true],
]);
Modal::end();

Answer 1

Initially, set the modal to a set of classes class="modal fade in"
in responsible for the active state