A simpler solution that may still meet your needs might be to use an animated GIF on a pop-up just to give the user some feedback that the upload is still in progress and that they should be patient.
You could setup something like this: The HTML form with upload file input element has a hidden field with some UUID generated by the Action. The UUID is just some unique ID to avoid having two upload forms with the same ID. For instance, the session-id or perhaps session-id+current_time would work fine for a UUID. Have the javascript onSubmit for the form pop-up a window, where the content of that window will be /uploadStatus.do?UUID=234344. Your /uploadStatus.do action will look for the UUID and forward to a JSP with the animated GIF in it if that file has not completed uploading. That JSP will have a meta-refresh in it that will refresh the content of the pop-up every few seconds. The form submit with the file upload input element will be uploading the file for a while. When it finishes, it will indicate that the file upload with UUID=234344 has completed to some server-side upload-tracking subsystem. Then it will forward or redirect to whatever page the user should see when the upload completes. The pop-up status window will refresh itself within a second or two, and the /uploadStatus.do action will determine that the upload for the file with UUID=234344 has completed (by checking with the server-side upload-tracking subsystem). It will then forward to a JSP that closes the pop-up window or shows a message that the upload has completed. This isn't a progress bar, but it should be easier to implement. You could even use a fast-cycling animated GIF that looks like a progress bar (but doesn't really relate to the actual % progress) if that would satisfy your UI design requirements. -Max ----- Original Message ----- From: <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Friday, March 19, 2004 1:31 AM Subject: File-Upload: Progress-Bar Hello everybody! I'm up to the task to implement a progress bar for File-Uploads, cause the files that are uploaded to my Webapp can be quite large. Well as usual this problem is not easily solved on the HTTP-Browser upload side. I'm using Struts here so I'm also using the commons/FileUpload. I was planning to do it that way that I assign a unique number to every session's-upload and keep the current status of an upload in a singleton for access. In an additional frame (with refresh) I would like to show the progress bar. My question: Has anybody done something like this with Struts before and can give me some little advise? Or more specific: Is it possible to first get the complete filesize from the FormFiles and the do the real Upload during the Action (keeping track of the read bytes) Thx for every help!! _______________________________________ Tim Adler, Abt. SDA1 Adress Management Solutions AZ | Direct Carl-Bertelsmann Straße 161s D-33311 Gütersloh Tel.: 05241/ 80 - 89574 [EMAIL PROTECTED] --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
