Looks like I might be able to achieve this with the a:jsFunction component. That lets me call into the whole JSF framework from a plain JS function. I can get a JS function to trigger when the file upload field is changed. And that could then trigger something with a:jsFunction. I did try to use a <a:commandButton> to do a partial-rerender when submitting a file upload, and that did not work. Somehow the backing bean method was getting called without any form data being submitted. I don't get it. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4077623#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...