Rails - Jun 2008 - Rails "clock" and Javascript "clock" seconds apart.

Hi All,

I''m having a bit of an issue with time in my application.  I''d
be
inclined to think that it was simply a machine time issue, but, as
I''ve run the application on multiple machines, I''m not so
sure.

Basically, my rails "current time" and my javascript "current
time"
are anywhere from 3 to 6 seconds apart.  Is there any way for me to
resolve this?

I suppose I could get a capture of each and add or subtract one from
the other, but the trouble is that I''m using a timer, and the logic to
ensure that the value doesn''t re-change after the initial setting
could get out of hand.  Are there perhaps any "static var" additions
to Javascript?

Thanks in advance for any suggestions.
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On Fri, 20 Jun 2008, gberz3 wrote:
> I''m having a bit of an issue with time in my application. 
I''d be
> inclined to think that it was simply a machine time issue, but, as
> I''ve run the application on multiple machines, I''m not so
sure.
> 
> Basically, my rails "current time" and my javascript
"current time"
> are anywhere from 3 to 6 seconds apart.  Is there any way for me to
> resolve this?
> 
> I suppose I could get a capture of each and add or subtract one from
> the other, but the trouble is that I''m using a timer, and the
logic to
> ensure that the value doesn''t re-change after the initial setting
> could get out of hand.  Are there perhaps any "static var"
additions
> to Javascript?
Do you really expect your browser and the remote server clocks to be 
exactly in sync?



-- 
A


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Yes, if they''re running on the same system. In a distributed system,
not at all, but it would be nice if it were *consistently* out of
sync.  Ya know?  Still I need a mechanism to right the wrong.
Thoughts?

On Jun 20, 4:07 pm, Eno <symb...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> On Fri, 20 Jun 2008, gberz3 wrote:
> > I''m having a bit of an issue with time in my application.
 I''d be
> > inclined to think that it was simply a machine time issue, but, as
> > I''ve run the application on multiple machines, I''m
not so sure.
>
> > Basically, my rails "current time" and my javascript
"current time"
> > are anywhere from 3 to 6 seconds apart.  Is there any way for me to
> > resolve this?
>
> > I suppose I could get a capture of each and add or subtract one from
> > the other, but the trouble is that I''m using a timer, and the
logic to
> > ensure that the value doesn''t re-change after the initial
setting
> > could get out of hand.  Are there perhaps any "static var"
additions
> > to Javascript?
>
> Do you really expect your browser and the remote server clocks to be
> exactly in sync?
>
> --
> A
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On 21 Jun 2008, at 02:16, gberz3 wrote:
>
> Yes, if they''re running on the same system. In a distributed
system,
> not at all, but it would be nice if it were *consistently* out of
> sync.  Ya know?  Still I need a mechanism to right the wrong.
> Thoughts?
>
What exactly are you doing? Is the time difference just the difference  
between when you evaluated Time.now in your app and when the page  
finished loading and the browser started to run the javascript?
> On Jun 20, 4:07 pm, Eno
<symb...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>> On Fri, 20 Jun 2008, gberz3 wrote:
>>> I''m having a bit of an issue with time in my application. 
I''d be
>>> inclined to think that it was simply a machine time issue, but, as
>>> I''ve run the application on multiple machines,
I''m not so sure.
>>
>>> Basically, my rails "current time" and my javascript
"current time"
>>> are anywhere from 3 to 6 seconds apart.  Is there any way for me to
>>> resolve this?
>>
>>> I suppose I could get a capture of each and add or subtract one
from
>>> the other, but the trouble is that I''m using a timer, and
the
>>> logic to
>>> ensure that the value doesn''t re-change after the initial
setting
>>> could get out of hand.  Are there perhaps any "static
var" additions
>>> to Javascript?
>>
>> Do you really expect your browser and the remote server clocks to be
>> exactly in sync?
>>
>> --
>> A
> >

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On Jun 22, 5:34 am, Frederick Cheung
<frederick.che...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> On 21 Jun 2008, at 02:16, gberz3 wrote:
>
>
>
> > Yes, if they''re running on the same system. In a distributed
system,
> > not at all, but it would be nice if it were *consistently* out of
> > sync.  Ya know?  Still I need a mechanism to right the wrong.
> > Thoughts?
>
> What exactly are you doing? Is the time difference just the difference  
> between when you evaluated Time.now in your app and when the page  
> finished loading and the browser started to run the javascript?

No, the difference is actually between the Javascript "Time.now", and
the rails property "Object.created_at".  What I did was just base the
time on the server completely and worked some code like the following:

//SET SOME OTHER VALUES IN RAILS EARLIER

<script type="text/javascript">

function clockwatch()

	if (typeof  initial_time == ''undef''){

		initial_time = <%= Time.new%>

	}

	initial_time++

	//perform my subtractions, etc here

}

</script>



My initial problem was the seeming lack of Javascript "static" types.
But using that allowed me to sort of create a static object.  Anyway,
basing the time strictly on the server worked.

One question:  If you use RJS does it get re-evaluated on each
iteration, or does it get "pumped out" once-for-all-time like regular
Javascript?

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>
> One question:  If you use RJS does it get re-evaluated on each
> iteration, or does it get "pumped out" once-for-all-time like
regular
> Javascript?
evaluated on each request.

Fred
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