use a Progess bar, but not for upload ???

If you use Ajax calls, you can specify the :before and :after parameters to show and hide a spinner/timer graphic.

If you need to actually show the % of work/file completed, you'll need to setup a process which has the status available, and call perdiocally_call_remote to check with the server what the status is (assuming its taking longer then regular client/server communication). The returning value would be a percentage/fraction, and you display a graphic associated with that percentage. If you want to get sophisticated, you may be able to run threads to split the progress

Hope this helps. Bart

If you want to execute a long-running process and not have it block the application, you'll need to use something like backgroundrb ( Then you can use a periodically_call_remote ajax callback to grab the status and update the progress bar.