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I'm trying to use 'use-ajax' class to load a page inside a modal box.

My Page is dynamically created using node id pass on my page controller

My link looks like this

Any idea on how can I achieve my goal?

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This is a render array that create a link that open a modal windows.

use Drupal\Core\Url;

public function build() {
$output = array();
$output['overlay_link'] = array(
  '#type' => 'link',
  '#title' => $this->t('Add an activity'),
  '#url' => Url::fromRoute('node.add', ['node_type' => 'event'], ['query' => ['destination' => $destination],
    'absolute' => TRUE,]),
  '#attributes' => [
    'class' => ['use-ajax', 'button', 'secondary'],
    'data-dialog-type' => 'modal',
    'data-dialog-options' => \Drupal\Component\Serialization\Json::encode(['title' => t('Add an activity'), 'width' => 800,]),
  ],
);
 return $output;
}

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