WordPress Export table as csv using Ajax

Hello guys i'm trying to export my plugin table in the same page, i tried to do hidden iframe but it's still not works, can you kindly check my code please? thanks.

PHP:

add_action( wp_ajax_export_plugin, export_plugin );   //update_records is action
add_action( wp_ajax_nopriv_export_plugin, export_plugin );

function export_plugin(){
  global $wpdb;
   $wpdb-show_errors = TRUE;
   $wpdb-suppress_errors = FALSE;

  

      
      $plugin_name = $_POST['plugin-name']; // PLUGIN NAME
      $plugin_export_type = $_POST['export-type']; // PLUGIN EXPORT TYPE as CVS/SQL/XML
  
      $plugin_name; // ?? not defined in original code
      $results = $wpdb-get_results(SELECT * FROM `wp_myplugin`,ARRAY_A);
    
    
    
      $csv_output = ''.implode(';',array_keys($results[0])).';'.\n;;
    
      foreach ($results as $row) {
        $csv_output .= ''.implode(';',$row).';'.\n;
      }
      $csv_output .= \n;
    
      $filename = $plugin_name._.date(Y-m-d_H-i,time());
      header(Content-type: application/force-download);
      header(Content-disposition: csv . date(Y-m-d) . $plugin_export_type);
      header( Content-disposition: filename=.$plugin_name.$plugin_export_type);
      header('Content-Description: File Transfer');

      echo $filename;
      exit;


}

AJAX JQUERY:

success:function(data){
            
     $('#ifram_download').src=/app?download=1filename= + data + '.csv';
}