[Seaside] Asynchronous update from web server

[Esteban Maringolo]

But using interval() is wrong. You're creating one new interval on every
call! And it doesn't have to be recursive.

Maybe instead of #setInterval: it is #interval: in your image.

Regards,

El mar., 9 de abr. de 2019 11:30, dtrussardi at tiscali.it <
dtrussardi at tiscali.it> escribió:

> Ciao,
>
>         thanks.
>
> > El lun., 8 abr. 2019 a las 7:48, dtrussardi at tiscali.it
> > (<dtrussardi at tiscali.it>) escribió:
> >
> >>        In my case i haven't any user actions on the client.
> >>        The client display some data with dynamic banner ( marquee tag )
> >>        and i need to update it only when the data to display change
> from the server.
> >>        When the data on the server relative to an banner change i need
> to force the clients banners update.
> >>        it seems to me that your initial solution may be fine.
> >>
> >>        What do you think?
> >
> > Too complex for such a simple task.
> >
> > Is the <marquee> tag still a thing? I though it dissapeared when
> > Geocities closed. :)
> >
> > See below my suggestion.
> >
> >
> >>        Another solution could be to manage an client ajax request with
> a specific interval
> >>        but  update the relative  banner div  only if the related data
> received from the server changed.
> >>                ( But how i can manage it?
> >>                 Can i not reply to an client ajax request
> >>                        or respond to doing nothing and continue to view
> the current status )
> >
> > You can have a recursive call to setInterval() that returns a script
> > (javascript) that updates the mentioned banner, and if no update is
> > necessary you do nothing. Doing it once per minute is nothing for the
> > server, since it's a simple AJAX call, which if nothing needs
> > updating, is fast to answer.
> >
> > These are the key parts:
> >
> > renderContentOn: html
> >  self renderBannerOn: html.
> >  html script: (html jQuery script: [ :script | self scriptUpdaterOn:
> script ])
> >
> > scriptUpdaterOn: aJSScript
> >  aJSScript <<
> >    ((aJSScript jQuery ajax
> >      script: [ :s |
> >        self shouldUpdate ifTrue: [ self scriptBannerUpdateOn: s ].
> >        self scriptUpdaterOn: s ]) setTimeout: 1 minute)
>
>         The setTimeout is not implemented in my system.
>
>         With    timeout:    i have some   problematic.
>
>         I change the             scriptUpdaterOn: aJSScript     to:
>
>         scriptUpdaterOn: aJSScript
>                 aJSScript <
>                          ((aJSScript jQuery ajax
>                           script: [ :s |
>                                         self shouldUpdate ifTrue: [ self
> scriptBannerUpdateOn: s ].
>                         ]) interval: 1 minute)
>
>         It works very well relatively to my current needs.
>
>         Dario
>
> >
> > scriptBannerUpdateOn: s
> >  s << ((s jQuery id: 'banner') replaceWith: [ :h | self renderBannerOn:
> h ])
> >
> > Attached to this mails goes a working example of this.
> >
> > In #scriptBannerUpdateOn: I would put all the logic, even by replacing
> > the whole component as a whole (sometimes the best compromise) or
> > indidividual elements within it).
> >
> >
> >
> > Regards,
> >
> > Esteban A. Maringolo
> > <EAMRecursiveTimeout.st>_______________________________________________
> > seaside mailing list
> > seaside at lists.squeakfoundation.org
> > http://lists.squeakfoundation.org/cgi-bin/mailman/listinfo/seaside
>
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