upload directory option not working?

[Beleggrodion]

I try to add the directory select option which is described at some point but i don't find any currently working example in the net or my tries working. I tried to adapt I tried to adapt https://stackoverflow.com/questions/34896873/plupload-select-folders-featue without success. I also tried different combination of options, add them , don't add them, etc.

      var uploader = new plupload.Uploader({
          runtimes : 'html5',
          browse_button : 'pickfiles',
          container: 'upload-container',
          url: '/upload',
          select_folder : true,
     });
     uploader.init();

     var fileInput = new moxie.file.FileInput({
          browse_button: 'pickfolder',
          container: 'upload-container',
          multiple: false,
          directory: true,
      });

      fileInput.init();

Is somewhere a working example? Ad the end i try to have a button for add files, a button for add directory and then a upload button.