Rails - May 2008 - Rails+Ajax how to auto update information with out user intervention?

Hi, all the examples I find of ajax on rails are mostly the same,
user clicks on link or button and ajax runs..
but what about if ajax starts when the page loads the first time
and keeps running? for example to have a clock  in reality what I need
is to check the number of online users I have in an application and to 
show this value on the page with out a need to reload..

Any place with a good example on how to do this? or a tip or something?
Thanks

-- 
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----------------------------------------------
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to the establishment of socialism.
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On Tue, May 13, 2008 at 12:49 AM, rek2
<rek2-zTjyZANo7oz3ktU1ABlop6HonnlKzd3f@public.gmane.org>
wrote:
>
>  Hi, all the examples I find of ajax on rails are mostly the same,
>  user clicks on link or button and ajax runs..
>  but what about if ajax starts when the page loads the first time
>  and keeps running? for example to have a clock  in reality what I need
>  is to check the number of online users I have in an application and to
>  show this value on the page with out a need to reload..
>
>  Any place with a good example on how to do this? or a tip or something?
>  Thanks
periodically_call_remote

http://api.rubyonrails.com/classes/ActionView/Helpers/PrototypeHelper.html#M000959



-- 
Greg Donald
http://destiney.com/

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Greg Donald wrote:
> On Tue, May 13, 2008 at 12:49 AM, rek2
<rek2-zTjyZANo7oz3ktU1ABlop6HonnlKzd3f@public.gmane.org> wrote:
>   
>>  Hi, all the examples I find of ajax on rails are mostly the same,
>>  user clicks on link or button and ajax runs..
>>  but what about if ajax starts when the page loads the first time
>>  and keeps running? for example to have a clock  in reality what I need
>>  is to check the number of online users I have in an application and to
>>  show this value on the page with out a need to reload..
>>
>>  Any place with a good example on how to do this? or a tip or
something?
>>  Thanks
>>     
>
> periodically_call_remote
>
>
http://api.rubyonrails.com/classes/ActionView/Helpers/PrototypeHelper.html#M000959
>
>
>
>   
Hi thanks for the link.. but there is calling a url I need to call the 
variable or a method
now I have something like this in views:
Current online users: <b>1<%= @online %></b>
and my method in my controller:

class StatusController < ApplicationController
def currently_online
        @online = Status.count_by_sql "SELECT COUNT(*) FROM status WHERE 
status = ''online'';"
 end

so I have the info I need auto updated on a variable @online



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All the powers of ``globalism'''' have entered into an unholy
alliance to exorcize this spectre:
Microsoft and Disney, the World Trade Organization, the United States Congress
and the European Commission.
Eben Moglen from the FSF.
http://emoglen.law.columbia.edu/publications/dcm.html

Solidarity:
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On 13 May 2008, at 08:07, rek2 wrote:
>>
>>
>>
> Hi thanks for the link.. but there is calling a url I need to call the
> variable or a method
> now I have something like this in views:
> Current online users: <b>1<%= @online %></b>
> and my method in my controller:
>
> class StatusController < ApplicationController
> def currently_online
>        @online = Status.count_by_sql "SELECT COUNT(*) FROM status  
> WHERE
> status = ''online'';"
> end
>
> so I have the info I need auto updated on a variable @online
First off that method probably belongs in the Status class. Secondly I  
think you''re making this more complicated than it is. All you need is  
a controller than can generated the appropriae bit of output (ie <b>1< 
%= @online %></b>). Make sure that that is easily indentifiable in  
your html (eg <div id="onlineusers">...</div>) then call  
periodically_update_remote, telling it to update the onlineusers div.

Fred

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Frederick Cheung escribió:
> On 13 May 2008, at 08:07, rek2 wrote:
>   
>>>
>>>       
>> Hi thanks for the link.. but there is calling a url I need to call the
>> variable or a method
>> now I have something like this in views:
>> Current online users: <b>1<%= @online %></b>
>> and my method in my controller:
>>
>> class StatusController < ApplicationController
>> def currently_online
>>        @online = Status.count_by_sql "SELECT COUNT(*) FROM status
>> WHERE
>> status = ''online'';"
>> end
>>
>> so I have the info I need auto updated on a variable @online
>>     
>
> First off that method probably belongs in the Status class. Secondly I  
> think you''re making this more complicated than it is. All you need
is
> a controller than can generated the appropriae bit of output (ie
<b>1<
> %= @online %></b>). Make sure that that is easily indentifiable in
> your html (eg <div id="onlineusers">...</div>) then
call
> periodically_update_remote, telling it to update the onlineusers div.
>
> Fred
>
>   
Hi Fred, I had it in the status class but then I had a problem because 
were in the view I have this is in the application layout view, someone 
told me to put  it on this controller and to pass a before filter, that 
works fine at least as a non-ajax solution.
yes yes of course I need to add divisions <div>  etc and update that 
part is clear, but what do I call  from periodically_update_remote in 
the action? the method? or the variable? as you saw before my method 
does not print anything just puts the right info into a variable.

Thanks.
.


-- 
http://rek2.binaryfreedom.info
http://www.spboston.org
----------------------------------------------
a social revolution is the only feasible route
to the establishment of socialism.
- Karl Marx -


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On 13 May 2008, at 17:26, rek2 wrote:
>>
>>
>
> Hi Fred, I had it in the status class but then I had a problem because
> were in the view I have this is in the application layout view,  
> someone
> told me to put  it on this controller and to pass a before filter,  
> that
> works fine at least as a non-ajax solution.
You need to set @online in the controller. What I mean was have a  
Status.count_online method, which a model thing ( and by the way I''d  
probably use Status.count :all, :conditions => ["status =
''online''"]
rather than count by sql.
>
> yes yes of course I need to add divisions <div>  etc and update that
> part is clear, but what do I call  from periodically_update_remote in
> the action? the method? or the variable? as you saw before my method
> does not print anything just puts the right info into a variable.
periodically_update_remote makes ajax requests. The only thing it can  
call is an action (which should output an appropriate bit of html).

Fred

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I remember the dialog.  What Fred is suggesting is what was
recommended previously.  I think the fragmented nature of the
conversation jumbled the puzzle but all the pieces were there.

On May 13, 12:31 pm, Frederick Cheung
<frederick.che...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> On 13 May 2008, at 17:26, rek2 wrote:
>
> > Hi Fred, I had it in the status class but then I had a problem because
> > were in the view I have this is in the application layout view,
> > someone
> > told me to put  it on this controller and to pass a before filter,
> > that
> > works fine at least as a non-ajax solution.
>
> You need to set @online in the controller. What I mean was have a
> Status.count_online method, which a model thing ( and by the way
I''d
> probably use Status.count :all, :conditions => ["status =
''online''"]
> rather than count by sql.
>
>
>
> > yes yes of course I need to add divisions <div>  etc and update
that
> > part is clear, but what do I call  from periodically_update_remote in
> > the action? the method? or the variable? as you saw before my method
> > does not print anything just puts the right info into a variable.
>
> periodically_update_remote makes ajax requests. The only thing it can
> call is an action (which should output an appropriate bit of html).
>
> Fred
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