WP Download multple post details as PDF

Create a New JS file “js/bulk-pdf.js” and Add the functions in functions.php and in “pdf-template.php” add your html

//Bulk All PDF
function enqueue_bulk_pdf_scripts() {
    wp_enqueue_script(
        'bulk-all-ccpdf', 
        plugin_dir_url(__FILE__) . 'js/bulk-pdf.js', 
        ['jquery'],
        '1.0.0', 
        true 
    );
    wp_localize_script('bulk-all-ccpdf', 'bulkPDFData', [
        'ajax_url' => admin_url('admin-ajax.php'),
    ]);
}
add_action('wp_enqueue_scripts', 'enqueue_bulk_pdf_scripts');
add_action('wp_ajax_get_bulk_certificate_html', 'get_bulk_certificate_html_callback');
function get_bulk_certificate_html_callback() {
    $bulk_ids = isset($_POST['bulk_ids']) ? explode(',', $_POST['bulk_ids']) : [];
    if (empty($bulk_ids)) {
        wp_send_json_error('No IDs sent');
    }
     ob_start();
    foreach ($bulk_ids as $post_id) {
        $get_bulk_post = get_post($post_id); 
        include plugin_dir_path(__FILE__) . 'templates/pdf-template.php';
        echo '<div style="page-break-after: always;"></div>';
    }
     $html = ob_get_clean();
    wp_send_json_success(['html' => $html]);
}

IN JS file add the AJAX script

jQuery(document).ready(function ($) {
    $('.all-download').on('click', function (e) {
        e.preventDefault();
         const bulkIds = $('#bulk_sid').val();
         if (bulkIds.length === 0) {
            alert('Please select at least one record.');
            return;
        }
        jQuery('a.btn.all-download').text('Downloading....');
        $.ajax({
            url: bulkPDFData.ajax_url,
            method: 'POST',
            data: {
                action: 'get_bulk_certificate_html',
                bulk_ids: bulkIds
            },
            success: function (response) {
                if (response.success) {
                    const tempDiv = document.createElement('div');
                    tempDiv.style.margin = '0';
                    tempDiv.style.padding = '0';
                    tempDiv.id = 'temp-div'; 
                    tempDiv.innerHTML = response.data.html;
                    document.body.appendChild(tempDiv);
                     html2pdf()
                        .from(tempDiv)
                        .set({
                            margin: 0,
                            filename: 'bulk-certificates-all.pdf',
                            image: { type: 'jpeg', quality: 0.98 },
                            html2canvas: { scale: 2 },
                            jsPDF: { unit: 'in', format: 'a4', orientation: 'portrait' }
                        })
                        .save()
                        .then(() => tempDiv.remove());
                        jQuery('a.btn.all-download').text('Download All');
                } else {
                    alert('Error: ' + response.data);
                    jQuery('a.btn.all-download').text('Download All');
                }
            },
            error: function () {
                alert('AJAX failed.');
            }
        });
    });
});