Why won't breadcrumbs load?

Question

Yii

The view has the following text:

\yii\widgets\Pjax::begin();
$this->title = $model->name;
$this->params['breadcrumbs'][] = ['label' => Yii::t('app', 'Clients'), 'url' => ['index']];
$this->params['breadcrumbs'][] = $this->title;

If I load the page in the usual way, then the braincrambs are reloaded too, but if I use Ajax, they don't. How can I make them work with Ajax as well? I guess that you need to manually call the bootstrap script with javascript, but which one?