scriptaculous - updater

Hi again

(1) I use an periodical that displays the time in the banner (always
present) on my app and It seems to me the presence of this priodical
avoid expiration of session ? Am I right ?

(2) Also, I did a manipulation that cancel the updater. If I use an
updater to change a part that contain a peridical, then the periodical
effect is cancelled until a full refresh. I dont 'understand why... if
you have any ideas to avoid loosing the effect or if I did something
wrong ? I joined a sample app that display time and an anchor that
refresh it using ajax.

snippet:
renderContent2On: html

    html paragraph
        script: (html periodical
                frequency: 2 second;
                  on: #renderTimeOn: of: self);
          with: [ self renderTimeOn: html ].
       
    html anchor
        onClick: (html updater
                    id: 'content';
                    on: #renderContent2On: of: self);
        with: 'live refresh'.


Thanks

cédrick




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> Hi again
>
> (1) I use an periodical that displays the time in the banner (always
> present) on my app and It seems to me the presence of this
> periodical avoid expiration of session ? Am I right ?

Yes.

Simple fix....

html anchor
    onClick: (html updater
                id: 'content';
                evalScripts: true;
                on: #renderContent2On: of: self);
    with: 'live refresh'.

By default, newly rendered JavaScript from an update, isn't evaluated.

Ramon Leon
http://onsmalltalk.com

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Ramon Leon a écrit :
>> Hi again
>>
>> (1) I use an periodical that displays the time in the banner (always
>> present) on my app and It seems to me the presence of this
>> periodical avoid expiration of session ? Am I right ?
>>    
>
> Yes.
>  
ok... can be useful... like in my case but maybe not for others... I
imagine the session are expiring as soon as the web page is closed ? cool !
I finaly understand what is the purpose of evalScripts... :)

I also aften see #return: in scriptaculous code (updater and evaluator).
Can you explain me the purpose of it... in an example if possible...

Thanks for all

Cédrick

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> I finally understand what is the purpose of evalScripts... :)
>
> I also aften see #return: in scriptaculous code (updater and
> evaluator).
> Can you explain me the purpose of it... in an example if possible...
>
> Thanks for all
>
> Cédrick

If you say return: fase; the tag with generate like so...

<a href="blabla" onclick="blalba; return false;">link</a>

Canceling the click, preventing the button, link, or whatever from posting
and leaving the page, this can be useful if you want to click an href to
live update a div, for example.

Ramon Leon
http://onsmalltalk.com 

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Ramon Leon wrote:
>> Hi again
>>
>> (1) I use an periodical that displays the time in the banner (always
>> present) on my app and It seems to me the presence of this
>> periodical avoid expiration of session ? Am I right ?
>>    
>
> Yes.

This I find interesting.  Doesn't this mean that if one wanted, one
could make the expiration cache extremely low (e.g. like 30 seconds) and
use something like this to ensure people who keep their browser open
don't lose the session, while not having to waste space on sessions for
people who have already surfed away from the site?  And it should be
fairly simple to make a hidden field in normal html (i.e. not
javascript) that does this autoupdate transparently (well, the user will
see a little blue reload every 10 seconds or so) to support users who
don't have javascript enabled?

Of course it isn't quite this simple.  The reason the session isn't
getting updates may be that the user is surfing a different part of the
site and will come back later via the back button.  But with a little
work I think something like this would be possible.  Right?
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Yup, I do this for exactly that reason, though I still keep a 10 minute
timeout.  As long as the browser stays open, the session remains active.
You don't even need to render anything to the client.

renderSessionKeepAliveOn: html
    html script: ((html periodical)
        frequency: (self preferenceAt: #sessionExpirySeconds) - 20;
        callback: [Transcript show: 'session touch'; cr];
        yourself)

Ramon Leon
http://onsmalltalk.com 

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