A countdown in ajax

Hi,

  I am trying to implement a sort of questionnaire.
There is one question per "page" (each page is simply
a div element that is rendered or not), and each page
has a time limit.

This means that I would like to show an ajax countdown in the
page, and I want to automatically change the page when the
time expires.

I have no idea on how to implement this,
since in my opinion it would involve a separate
thread that takes care of the timing issue.
And I wouldn't know what's the way to deal with
threads in seaside.

Do you have any pointer/suggestion for me?

Thank you,
  Alberto
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I don't have a computer at hand right now, but there is a Pier
component (as far as I remember called Pier-Counter or Pier-Countdown)
that does more or less that.

The idea is to implement the counter in Javascript and have some extra
validation (so that nobody can cheat) on the server.

Lukas

On Saturday, September 18, 2010, Alberto Bacchelli
<[hidden email]> wrote:
--
Lukas Renggli
www.lukas-renggli.ch
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If you want to do it from the seaside side, you could use Comet (the "self pusher" below).

When the question is rendered, start a timer:

startTimerProcess

    timerProcess := [
        [
            (Delay forSeconds: howLong) wait.
            self pusher javascript: [ :script |
                script << (script jQuery: #whatsHisName) load html: [ :h | ...update with new content...]
            ].
        ].
        timerProcess := nil.
    ] forkAt: Processor userBackgroundPriority.

If the timer expires, the

        script << (script jQuery: #whatsHisName) ...update with new content...

could move to the next question. If the user answers before the time expires, then kill the timer and start a new one (if needed)

timerProcess terminate.
timerProcess := nil.
self startTimerProcess.

Cheers,
Bob

On 9/18/10 11:44 AM, Alberto Bacchelli wrote:

Hi,

 I am trying to implement a sort of questionnaire.
There is one question per "page" (each page is simply
a div element that is rendered or not), and each page
has a time limit.

This means that I would like to show an ajax countdown in the
page, and I want to automatically change the page when the
time expires.

I have no idea on how to implement this,
since in my opinion it would involve a separate
thread that takes care of the timing issue.
And I wouldn't know what's the way to deal with
threads in seaside.

Do you have any pointer/suggestion for me?

Thank you,
 Alberto
_______________________________________________
seaside mailing list
[hidden email]
http://lists.squeakfoundation.org/cgi-bin/mailman/listinfo/seaside

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