[Seaside] Can't get PTPeriodical to update

John McKeon p3anoman at gmail.com
Mon Aug 13 15:12:20 UTC 2012

Hi Nick
I found it works if I remove the "second" i.e. frequency: 1;
In a workspace you can print "1 second" to see why it probably causes

Also, you do not want to send super initialize in a *class* initialize
method. Just "one of those things". You can probably search the list
archives to get a better explanation.

Happy Trails

On Mon, Aug 13, 2012 at 10:19 AM, Nick Brown <nickbrown at fastmail.fm> wrote:

> Hello folks.
> I'm modifying a seaside application of mine so that parts of the UI will
> periodically poll to see if anything's changed. I had a look at the
> relevant section of the online seaside book, and it seems like
> PTPeriodical is exactly what I want. Unfortunately I can't even get the
> book's code example to work for me, so hopefully somebody can tell me
> what I'm doing wrong.
> I'm using the current Seaside/Pharo v3.0.7 one-click image from
> seaside.st, and current stable releases of Firefox and Chrome (on
> Windows). The following, applied to a fresh image, illustrates my
> problem:
> I create a WAComponent subclass, called MyTest.
> I give it a class initialization method as follows:
> initialize
>         super initialize.
>         (WAAdmin register: self asApplicationAt: 'mytest')
>                 addLibrary: PTDeploymentLibrary;
>                 addLibrary: SUDeploymentLibrary.
> (taken from
> http://book.seaside.st/book/web-20/scriptaculous/frameworks/library )
> And renderContentOn: as follows:
> renderContentOn: html
>         html div
>                 script: (html scriptaculous periodical
>                         frequency: 1 second;
>                         callback: [ :ajaxHtml | ajaxHtml render: Time
>                         now ]
>                 );
>                 with: Time now.
> (taken from
> http://book.seaside.st/book/web-20/scriptaculous/ajax/background )
> I manually call the class initialzation method to register the
> application, then visit it in a browser. I can see that the time does
> update, but only once. Wireshark confirms only a single XMLHttpRequest
> is coming back from the browser.
> I'm afraid my Javascript debugging skills are largely non-existant, but
> certainly the browser's JS console shows no errors or warnings.
> I've tried explicitly calling #start on the PTPeriodical instance, in
> which case I then get two XMLHttpRequests back from the browser in quick
> succession, but still no ongoing periodical updates.
> Grateful for any advice.
> Cheers,
> Nick Brown
> _______________________________________________
> seaside mailing list
> seaside at lists.squeakfoundation.org
> http://lists.squeakfoundation.org/cgi-bin/mailman/listinfo/seaside
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