[Seaside] Asynchronous update from web server
Esteban Maringolo
emaringolo at gmail.com
Wed Apr 10 17:38:17 UTC 2019
The library is fine and the JQDevelopmentLibrary is just for the
replacement, the setTimeout() and interval() are part of the built-in
functions in all browsers and comes in the Javascript package of
Seaside itself.
Can you share the code you're using? Is it exactly the same example I
sent a few mails back?
Regards,
Esteban A. Maringolo
El mié., 10 abr. 2019 a las 14:05, dtrussardi at tiscali.it
(<dtrussardi at tiscali.it>) escribió:
>
>
> > Which version of Seaside are you using?
>
> I using the Seaside 3.2.2 on Pharo 7.0-64-1262
>
>
> > I can see that #timeout: is the deprecated implementation of the
> > #setTimeout: method of latest Seaside releases, and it instantiates a
> > JSTimeout object whose #javascriptContentOn: is as follows:
>
> The following code is identical
>
> > JSTimeout>>javascriptContentOn: aStream
> > aStream nextPutAll: 'setTimeout(function(){'.
> > super javascriptContentOn: aStream.
> > aStream
> > nextPutAll: '},';
> > javascript: self duration;
> > nextPut: $)
> >
> > So in theory it should do the same thing.
> >
> > Did you try my attached example replacing the #setTimeout: call by the
> > #timeout: equivalent?
>
> Yes, don't works
> >
> > Are you replacing the right DOM element in #scriptBannerUpdateOn: ?
>
> Yes. With interval: is right update ( therefore the reference is correct )
>
>
>
> But which libraries should I add when register the application?
>
> I register it with:
>
> app := WAAdmin register: self asApplicationAt: 'recursiveTimeout'.
>
> app addLibrary: JQDevelopmentLibrary
>
> it's right?
>
> Thanks,
>
> Dario
>
> > Regards,
> >
> > Esteban A. Maringolo
> >
> > El mié., 10 abr. 2019 a las 12:36, dtrussardi at tiscali.it
> > (<dtrussardi at tiscali.it>) escribió:
> >>
> >> Ciao,
> >>
> >>
> >>> Shouldn't your script have two < instead of one? Like this:
> >>
> >> it's an error in the email.
> >>
> >> The code is right,
> >>
> >> but with timeout: the banner is not update.
> >>
> >> with interval: it is update.
> >>
> >> considerations ?
> >>
> >> Thanks,
> >>
> >> Dario
> >>
> >>>
> >>> scriptUpdaterOn: aJSScript
> >>> aJSScript <<
> >>> ((aJSScript jQuery ajax
> >>> script: [ :s |
> >>> self shouldUpdate ifTrue: [ self
> >>> scriptBannerUpdateOn: s ].
> >>> ]) timeout: 1 minute)
> >>>
> >>>
> >>>
> >>>
> >>> dtrussardi at tiscali.it wrote
> >>>> Ciao,
> >>>>
> >>>>> 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.
> >>>>
> >>>> You mean timeout:
> >>>>
> >>>> But with:
> >>>>
> >>>>
> >>>> scriptUpdaterOn: aJSScript
> >>>> aJSScript <
> >>>> ((aJSScript jQuery ajax
> >>>> script: [ :s |
> >>>> self shouldUpdate ifTrue: [ self
> >>>> scriptBannerUpdateOn: s ].
> >>>> ]) timeout: 1 minute)
> >>>>
> >>>> i don't have any updating.
> >>>>
> >>>> With: scriptUpdaterOn: aJSScript
> >>>> aJSScript <
> >>>> ((aJSScript jQuery ajax
> >>>> script: [ :s |
> >>>> self shouldUpdate ifTrue: [ self
> >>>> scriptBannerUpdateOn: s ].
> >>>> self scriptUpdaterOn: s
> >>>> ]) timeout: 1 minute)
> >>>>
> >>>> i have strange behavior.
> >>>>
> >>>> The browser application go to 50% of CPU.
> >>>>
> >>>> Thanks,
> >>>>
> >>>> Dario
> >>>>
> >>>>>
> >>>>> Regards,
> >>>>>
> >>>>> El mar., 9 de abr. de 2019 11:30,
> >>>
> >>>> dtrussardi@
> >>>
> >>>> <
> >>>
> >>>> dtrussardi@
> >>>
> >>>> > escribió:
> >>>>> Ciao,
> >>>>>
> >>>>> thanks.
> >>>>>
> >>>>>> El lun., 8 abr. 2019 a las 7:48,
> >>>
> >>>> dtrussardi@
> >>>
> >>>>>> (<
> >>>
> >>>> dtrussardi@
> >>>
> >>>> >) 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>
> >>>> _______________________________________________
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> >>>>>
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> >>>
> >>>
> >>>
> >>>
> >>> --
> >>> Sent from: http://forum.world.st/Seaside-General-f86180.html
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