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How do I show an Open/Save file dialog using an AJAX callback?

In the form builder I have the following code.

$form['export_to_pdf'] = [   '#type' => 'submit',   '#value' => $this->t('Pdf Format'),   '#attributes' => array('name'=>'print_pdf',),   '#ajax'=> array(     'callback' => '::exportPdf',     'event' => 'click',     'effect' => 'fade',     'prevent' => 'submit',     'progress' => array(       'type' => 'throbber',       'message' => t('Retrieving...'),     ),   ), ];

The callback function is the following one. 

public function exportPdf(array &$form, FormStateInterface $form_state) {    global $base_url;   $url = "{$base_url}/pdf_templates/report.pdf";   $response = new AjaxResponse();   $response->addCommand(new RedirectCommand($url));   return $response; }

This works, but it doesn’t pop up the Open/Save file dialog. It redirects to the PDF file. How do I make the callback show the Open/Save file dialog so that the users can either open or save according to their wish?

This article was republished from its original source.
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How do I show an Open/Save file dialog using an AJAX callback?

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