[hunchentoot-devel] Showing progress to the user

[Mac Chan]

Unless one of your requirements is to support clients with javascript
disabled, your best bet is not to tie up the connection while your
server is doing some busy calculations.

There are many javascript libraries out there that provide ajax
progress bar component.

Basically the browser send all the relevant inforamtion to the server
via an async ajax call, and the server will return a token or id. If
you are using one of those progress bar components, it should handle
the polling and UI updates. All you need to do is provide an ajax
handler to send the job progress (0-100%, or error status) in
XML/JSON, etc.

HTH,
-- Mac

On 3/9/07, Lars Rune Nøstdal <larsnostdal at gmail.com> wrote:
> On 3/9/07, Andrei Stebakov <lispercat at gmail.com> wrote:
> > I'd like to know if there is some functionality in hunchentoot that would
> > allow me to show the progress page to the user. Let's say a user click on a
> > link handle by hunchentoot hander method which takes a lot of time to
> > process. How can I show a page that says "Please, wait" which will redirect
> > to the actual data view of the handler?
> > Here I can think of only "<meta http-equiv='refresh' content='0;" but maybe
> > there is something supported by the framework?
> > Sorry if my question is not totally related to hunchentoot.
>
> You could maybe set up a chunked response for the "please wait"-page
> and somehow make an event trigger when it is completely loaded (when
> the server side stuff is done). Using javascript with an `onload'
> might work.
>
> http://www.w3schools.com/jsref/jsref_onload.asp
>
> (i'm new to the list btw. .. hope this ends up in the right location/thread)
>
> --
> Mvh,
> Lars Rune Nøstdal
> http://nostdal.org/
>
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