Use programmatic file upload (via plugin) after asking questions to user

fileupload-experiment.html

<!--

see also: https://github.com/blueimp/jQuery-File-Upload/issues/473
This didn't work with an 'old' version of the plugin, try the latest one.
Idea is to do file upload all programmatically, thus only sending files once user has confirmed what to do with the files.

-->

  <div class="row">
    <div class="span10">
      <script type="text/javascript">
        function doStuffWithFiles(files) {
          console.log("do stuff, files=" + files.files);
          document.myfiles = files.files; // TODO: not like this, just for now :)
          var result = confirm("Confirm if you want to upload! (We'd rather ask if you want to create new versions of files or have new files or cancel)");
          if (result) {
            console.log("now upload...");
            try {
              var r = $.fn.fileupload('send',
                  { files: document.myfiles,
                    done: function(e, data) {
                      console.log("done, textStatus=" + data.textStatus);
                    }
                  });
            } catch (error) {
              console.log("error: " + error);
            }
          } else {
            console.log("don't upload.");
          }
        };

      </script>
      <form id="dummy_for_plugin" action="<%= node_upload_path(@folder) %>" method="post" enctype="multipart/form-data"></form>
      <form>
        <input id="myfiles" type="file" multiple="multiple">Select file(s)</input>
        <input class="btn btn-primary" value="Do stuff with the files" type="submit"
               onclick="doStuffWithFiles($('#myfiles')[0]); return false; "/>
      </form>
    </div>
  </div>