AJAX PDF Download

Controller.php

/**
 * AJAX handler to generate and return a PDF of the desired report
 *
 * @param string $shareCode The share code for the report
 * @return Response PDF download response
 */
public function view_onDownloadPdf($shareCode)
{
    return Backend::redirect("author/plugin/download-pdf/$shareCode");
}

/**
 * Download the generated report as a PDF
 *
 * @param string $shareCode The share code for the report
 * @return Response
 */
public function downloadPdf($shareCode)
{
    $report = Report::getFromShareCode($shareCode);
    if (!$report) {
        abort(404);
    }

    $this->view($shareCode);
    $html = $this->makeView('view');

    $pdf = SnappyPDF::loadHTML($html)
        ->setOption('margin-top', 10)
        ->setOption('margin-bottom', 10)
        ->setOption('margin-left', 8)
        ->setOption('margin-right', 8)
        ->setPaper('letter')
        ->output();

    $response = Response::make();
    $response->header('Content-Type', 'application/pdf');
    $response->header('Content-Transfer-Encoding', 'binary');
    $response->header('Content-Disposition', sprintf('%s; filename="%s"', 'attachment', str_slug($report->name) . '.pdf'));
    $response->setContent((string) $pdf);
    return $response;
}