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Re: How to write a browser based timer

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On Thu, 23 Feb 2012 19:31:27 +0000, Dr J R Stockton
<reply1208@merlyn.demon.co.uk> wrote:

[snip]

>The answer, IMHO, is to use setInterval.  I'm not sure what happens if
>one calls for an interval of one second and, after a while, keeps the
>CPU very busy for a few seconds - does one get a burst of late
>setInterval handler calls, or are some lost?  And what if, after
>starting with setInterval, the machine is put into standby for a while?
>But with setInterval, delays of substantially under a second in making
>one handler call do not accumulate, as they would with simple repeated
>setTimeout (Func, /const/)

     I suspect that the next interval is set as part of the previous
one firing:

     Catch that an interval has expired:
        Set next interval.
        Do what is supposed to be done with an fired interval.
     
>To allow as best one can for such possibilities, the OP should NOT count
>those handler calls for a measure of time, but should call new Date() to
>get the time in milliseconds, from which simple arithmetic will get the
>minutes, seconds, and maybe fractional part to display.

     Quite.

>However, the valid objections to a wait loop along the lines of
>        while (new Date()<EndTime) { ... }
>are fewer than commonly thought.  A simple loop calculating the date of
>Gregorian Easter Sunday for a full cycle or more takes a significant
>while, but with at least some browsers the machine is still adequately
>responsive.

     I do not agree.  On a system doing only one thing (as far as the
user is concerned?), that may be fine, but with multiple things going,
no.

Sincerely,

Gene Wirchenko

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Thread

How to write a browser based timer " Cal Who" <CalWhoNOSPAM@roadrunner.com> - 2012-02-21 15:50 -0500
  Re: How to write a browser based timer Scott Sauyet <scott.sauyet@gmail.com> - 2012-02-21 13:04 -0800
    Re: How to write a browser based timer Gene Wirchenko <genew@ocis.net> - 2012-02-21 13:45 -0800
      Re: How to write a browser based timer "Evertjan." <exjxw.hannivoort@interxnl.net> - 2012-02-21 22:40 +0000
        Re: How to write a browser based timer Gene Wirchenko <genew@ocis.net> - 2012-02-21 15:04 -0800
          Re: How to write a browser based timer "Evertjan." <exjxw.hannivoort@interxnl.net> - 2012-02-21 23:27 +0000
            Re: How to write a browser based timer Gene Wirchenko <genew@ocis.net> - 2012-02-21 16:08 -0800
              Re: How to write a browser based timer "Evertjan." <exjxw.hannivoort@interxnl.net> - 2012-02-22 15:41 +0000
                Re: How to write a browser based timer Gene Wirchenko <genew@ocis.net> - 2012-02-22 09:19 -0800
                Re: How to write a browser based timer "Evertjan." <exjxw.hannivoort@interxnl.net> - 2012-02-22 21:55 +0000
                Re: How to write a browser based timer Gene Wirchenko <genew@ocis.net> - 2012-02-22 15:01 -0800
        Re: How to write a browser based timer RobG <rgqld@iinet.net.au> - 2012-02-21 18:18 -0800
          Re: How to write a browser based timer Dr J R Stockton <reply1208@merlyn.demon.co.uk> - 2012-02-23 19:31 +0000
            Re: How to write a browser based timer Gene Wirchenko <genew@ocis.net> - 2012-02-23 16:38 -0800
              Re: How to write a browser based timer Dr J R Stockton <reply1208@merlyn.demon.co.uk> - 2012-02-25 20:29 +0000
                Re: How to write a browser based timer "Evertjan." <exjxw.hannivoort@interxnl.net> - 2012-02-26 23:02 +0000
      Re: How to write a browser based timer Dr J R Stockton <jrs@merlyn.demon.co.uk> - 2012-02-22 18:51 +0000
    Re: How to write a browser based timer " Cal Who" <CalWhoNOSPAM@roadrunner.com> - 2012-02-23 10:23 -0500
      Re: How to write a browser based timer Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2012-02-23 22:13 +0100
        Re: How to write a browser based timer Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2012-02-24 09:41 +0100

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