Slava Rozhnev

return response('Something went wrong', 500)->header('Content-Type', 'text/plain');

$('#select_workspace').on('change', function(){
      var workspace = $(this).val();
      // ***********************************************
      var worktype = $('#select_worktype').val();
      // ***********************************************

      if(workspace){
        $.get(
          "ajax.php",
          {workspace: workspace, worktype:worktype},
          function (data2){
            $('#select_position').html(data2);
          }
        );
      }else{
        $('#select_position').html('<option disabled selected>Выбор формирования</option>');
      }
    });