clock in javascript

#1 (**permalink**) 12-30-2006, 09:59 PM

is there a way to display a ticking clock in a web page using
javascript? but not in a textbox, rather as text that i can change the
style, font etc.

cenk tarhan

#2 (**permalink**) 12-30-2006, 10:05 PM

cenktarhancenk@gmail.com wrote:
> is there a way to display a ticking clock in a web page using
> javascript? but not in a textbox, rather as text that i can change the
> style, font etc.

<http://www.dynamicdrive.com/dynamicindex6/clock2.htm>

see <http://www.dynamicdrive.com/dynamicindex6/> for more

#3 (**permalink**) 12-30-2006, 10:45 PM

thanks a lot VK, for the qucikest reply ever!

#4 (**permalink**) 12-30-2006, 10:50 PM

cenktarhancenk@gmail.com wrote:
> is there a way to display a ticking clock in a web page using
> javascript? but not in a textbox, rather as text that i can change the
> style, font etc.
>
> cenk tarhan
>
<html>
<head>
<title>Clock</title>
</head>
<body>
<body>
<div id='clock' class='somecssstyle'></div>

<script langage='javascript :-P' type='text/javascript'>
var months=new Array("January", "February", "Mararch", "April",
"May", "June", "Julu", "August", "September", "October", "November",
"December");
var calDays=new Array("Sunday", "Monday", "Tuesday", "Wednesday",
"Thursday", "Friday", "Saturday");
var clockID = document.getElementById('clock');

function pad(i) {
//simple function to just add a zero in front of numbers less
than zero (so we get 12:05 instead of 12:5)
if (i < 10) {
i = "0"+i;
}
return(i);
}

function doClock() {
setTimeout( "doClock()", 1000 );
t = new Date();
m = t.getMonth();
d = t.getDay();
dt = t.getDate();
y = t.getFullYear();
h = t.getHours();
if (h < 12) {
ap="AM";
} else {
ap="PM";
h=h-12;
}
mn= pad(t.getMinutes());
s = pad(t.getSeconds());
if (h==0) {
h = 12
}
clockID.innerHTML=calDays[d]+", "+months[m]+" "+dt+"
"+y+"<BR>"+h+":"+mn+":"+s+" "+ap;
}

doClock()
</script>
</body>

</html>

Happy new year -- or else!

--
http://www.hunlock.com -- Musings in Javascript, CSS.
$FA

#5 (**permalink**) 12-31-2006, 06:17 AM

pcx99 wrote:
> cenktarhancenk@gmail.com wrote:
>> is there a way to display a ticking clock in a web page using
>> javascript? but not in a textbox, rather as text that i can change the
>> style, font etc.
[...]
> <div id='clock' class='somecssstyle'></div>
>
> <script langage='javascript :-P' type='text/javascript'>

Was there ever a script element attribute called 'langage'? ;-)

> var months=new Array("January", "February", "Mararch", "April",
> "May", "June", "Julu", "August", "September", "October", "November",
> "December");

I think you need to use a spell checker.

> var calDays=new Array("Sunday", "Monday", "Tuesday", "Wednesday",
> "Thursday", "Friday", "Saturday");
> var clockID = document.getElementById('clock');
>
> function pad(i) {
> //simple function to just add a zero in front of numbers less than
> zero (so we get 12:05 instead of 12:5)
> if (i < 10) {
> i = "0"+i;
> }
> return(i);
> }

A more concise function for this case is:

function pad(i){
return (i<10)? '0'+i : ''+i;
}

> function doClock() {
> setTimeout( "doClock()", 1000 );

Simply setting a timeout of 1000 ms does not guarantee that the function
will run at exactly 1 second intervals, otherwise you could just use
setInterval.

> t = new Date();
> m = t.getMonth();
> d = t.getDay();
> dt = t.getDate();
> y = t.getFullYear();
> h = t.getHours();
> if (h < 12) {
> ap="AM";
> } else {
> ap="PM";
> h=h-12;
> }
> mn= pad(t.getMinutes());
> s = pad(t.getSeconds());
> if (h==0) {
> h = 12

I never understood the concept of representing times between midnight
and 1:00 am as 12:xx am. Why not 00:xx am? There is far less chance of
confusion. A large percentage of the world uses a 24hr clock, so maybe
that's a better idea.

I don't know why anyone wants to put an clock in a web page unless it's
to display the time somewhere other that where the visitor is located.
Anyhow, here's another effort. I find changing the value of a text node
causes less flicker and is faster in some browsers than changing the
innerHTML.

<script type="text/javascript">

function Clock(id) {
if (typeof id == 'string') id = document.getElementById(id);
this.el = id;
}

Clock.prototype.month = ['Jan','Feb','Mar','Apr','May','Jun',
'Jul','Aug','Sep','Oct','Nov','Dec'];

Clock.prototype.day = ['Sun','Mon','Tue','Wed','Thu','Fri','Sat'];

Clock.prototype.addZ = function(n){ return (n<10)? '0'+n: ''+n; };

Clock.prototype.tick = function(){
var clock = this;
var t = new Date();
this.el.firstChild.data = clock.day[t.getDay()] + ', '
+ clock.addZ(t.getDate()) + ' '
+ clock.month[t.getMonth()] + ' '
+ t.getFullYear() + ', '
+ clock.addZ(t.getHours()) + ':'
+ clock.addZ(t.getMinutes()) + ':'
+ clock.addZ(t.getSeconds());

setTimeout(function(){clock.tick();}, (1.05 - t.getMilliseconds()));
}

</script>

<span id="clock"> </span>
<script type="text/javascript">
var digClock = new Clock('clock'); digClock.tick();
</script>

--
Rob

#6 (**permalink**) 12-31-2006, 11:02 AM

In comp.lang.javascript message <1167519559.295969.19160@a3g2000cwd.goog
legroups.com>, Sat, 30 Dec 2006 14:59:19, cenktarhancenk@gmail.com
posted:
>is there a way to display a ticking clock in a web page using
>javascript? but not in a textbox, rather as text that i can change the
>style, font etc.

<URL:http://www.merlyn.demon.co.uk/js-date2.htm>
<URL:http://www.merlyn.demon.co.uk/js-anclk.htm>

It's a good idea to read the newsgroup and its FAQ. See below.

--
(c) John Stockton, Surrey, UK. ?@merlyn.demon.co.uk Turnpike v6.05 IE 6
news:comp.lang.javascript FAQ <URL:http://www.jibbering.com/faq/index.html>.
<URL:http://www.merlyn.demon.co.uk/js-index.htm> jscr maths, dates, sources.
<URL:http://www.merlyn.demon.co.uk/> TP/BP/Delphi/jscr/&c, FAQ items, links.

#7 (**permalink**) 12-31-2006, 09:26 PM

RobG wrote:

> I never understood the concept of representing times between midnight
> and 1:00 am as 12:xx am.

That's how it's been represented on most analog clocks for centuries.

#8 (**permalink**) 12-31-2006, 10:02 PM

Lee wrote:
> RobG wrote:
>
> > I never understood the concept of representing times between midnight
> > and 1:00 am as 12:xx am.
>
> That's how it's been represented on most analog clocks for centuries.

Which doesn't explain why it should be used with digital clocks based
on 24 hr time, even those that wish to use 12 hour intervals with am
and pm. 00:15 (am) is unambiguous, 12:15 am can easily be
misunderstood. 12:00 am and 12:00 pm make no sense and create
confusion.

Only a small proportion of the world's population uses 12 hour notation
with am/pm, 24 hr notation is preferable on the web.

Happy new year :-)

--
Rob

#9 (**permalink**) 01-01-2007, 04:33 PM

In comp.lang.javascript message <459763f0$0$2605$5a62ac22@per-
qv1-newsreader-01.iinet.net.au>, Sun, 31 Dec 2006 17:17:01, RobG
<rgqld@iinet.net.au> posted:
>pcx99 wrote:

>A more concise function for this case is:
>
>function pad(i){
> return (i<10)? '0'+i : ''+i;
>}

or

function pad(i) { return (i<10 ? '0' : '') + i }

> setTimeout(function(){clock.tick();}, (1.05 - t.getMilliseconds()));
>}

I think you mean 1050 not 1.05 ; I wonder how that method compares in
efficiency with (1050 - t%1000), and how one could tell.

For anywhere using ISO 8601 time format, something like
new Date().toString().match(/[\d:]{8}/)
or new Date().toString().match(/([\d:]{8})/)[1]
or new Date().toString().match(/\s(\d+:[\d:]+)\s/)[1]
will give hh:mm:ss.

Since the OP wanted a clock, I see no need to provide a calendar
function.

--
(c) John Stockton, Surrey, UK. ?@merlyn.demon.co.uk Turnpike v6.05 IE 6.
Web <URL:http://www.merlyn.demon.co.uk/> - w. FAQish topics, links, acronyms
PAS EXE etc : <URL:http://www.merlyn.demon.co.uk/programs/> - see 00index.htm
Dates - miscdate.htm moredate.htm js-dates.htm pas-time.htm critdate.htm etc.

#10 (**permalink**) 01-01-2007, 10:29 PM

Fred wrote:
> Lee wrote:
>> RobG wrote:
>>
>>> I never understood the concept of representing times between midnight
>>> and 1:00 am as 12:xx am.
>> That's how it's been represented on most analog clocks for centuries.
>
> Which doesn't explain why it should be used with digital clocks based
> on 24 hr time, even those that wish to use 12 hour intervals with am
> and pm. 00:15 (am) is unambiguous, 12:15 am can easily be
> misunderstood.

"12:15 am" cannot easily be misunderstood by anyone who understands
what am and pm mean. "12:00 am" seems to be a problem for people who
have trouble with concept formation.

I personally perfer 24-hour time notation, but if you're going to
use am and pm, the midnight hour is correctly represented as "12".

#11 (**permalink**) 01-02-2007, 04:09 AM

Dr J R Stockton wrote:
> In comp.lang.javascript message <459763f0$0$2605$5a62ac22@per-
> qv1-newsreader-01.iinet.net.au>, Sun, 31 Dec 2006 17:17:01, RobG
> <rgqld@iinet.net.au> posted:
[...]
> > setTimeout(function(){clock.tick();}, (1.05 - t.getMilliseconds()));
> >}
>
> I think you mean 1050 not 1.05 ;

Yes - 1.05 makes the clock update rather too often :-x

> I wonder how that method compares in
> efficiency with (1050 - t%1000), and how one could tell.

For a single call? Impossible using javascript I think, it probably
requires acccurate measurement of nanoseconds. :-) Running a loop of
10,000 calls shows getMilliseconds is 20% faster in Safari but takes 3
times longer than the remainder operator in Firefox on OS X.

> For anywhere using ISO 8601 time format, something like
> new Date().toString().match(/[\d:]{8}/)
> or new Date().toString().match(/([\d:]{8})/)[1]
> or new Date().toString().match(/\s(\d+:[\d:]+)\s/)[1]
> will give hh:mm:ss.
>
> Since the OP wanted a clock, I see no need to provide a calendar
> function.

I was thinking the same thing - if a 24hr clock suits then:

<script type="text/javascript">
function runClock(el) {
if (typeof el == 'string') el = document.getElementById(el);
var t = new Date();
el.firstChild.data = t.toString().match(/([\d:]{8})/)[1];
setTimeout( function(){runClock(el);}, 1050 - t%1000 );
}
</script>

<div id="digiClock"> </div>
<script type="text/javascript">runClock('digiClock');</script>

--
Rob

#12 (**permalink**) 01-02-2007, 05:33 PM

Lee wrote:
> Fred wrote:
>> Lee wrote:
>>> RobG wrote:
>>>
>>>> I never understood the concept of representing times between midnight
>>>> and 1:00 am as 12:xx am.
>>> That's how it's been represented on most analog clocks for centuries.
>>
>> Which doesn't explain why it should be used with digital clocks based
>> on 24 hr time, even those that wish to use 12 hour intervals with am
>> and pm. 00:15 (am) is unambiguous, 12:15 am can easily be
>> misunderstood.
>
> "12:15 am" cannot easily be misunderstood by anyone who understands
> what am and pm mean. "12:00 am" seems to be a problem for people who
> have trouble with concept formation.

To be absolutely strict, it is "12:00 noon" and "12:00 midnight".
Neither one of the two is either AM or PM. However, a great many
mechanical and electronic time displays have problems with this, and so
"12:00 a.m." has come to be used to mean "12:00 midnight" and "12:00
p.m." to mean "12:00 noon".

--
John W. Kennedy
"The blind rulers of Logres
Nourished the land on a fallacy of rational virtue."
-- Charles Williams. "Taliessin through Logres: Prelude"

#13 (**permalink**) 01-02-2007, 06:09 PM

John W. Kennedy wrote on 02 jan 2007 in comp.lang.javascript:

> To be absolutely strict, it is "12:00 noon" and "12:00 midnight".
> Neither one of the two is either AM or PM. However, a great many
> mechanical and electronic time displays have problems with this, and so
> "12:00 a.m." has come to be used to mean "12:00 midnight" and "12:00
> p.m." to mean "12:00 noon".
>

.... which does not stop us in the rest of the world being amazed over.

It is completely illogical, but nicely explained, john.

--
Evertjan.
The Netherlands.
(Please change the x'es to dots in my emailaddress)

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