Comments on: Javascript Sleep Function

By: AGreenhill

AGreenhill — Thu, 13 May 2010 18:59:29 +0000

This is not a solution for me… I’m trying to avoid the IE script warning that occurs when a few million javascript operations occur… this can be done by setTimeout() but I seem to also require a true javascript sleep() function. Your jsleep() routine doesn’t help since it simply chugs through a loop at lightning speed. Have you tried your jsleep() on IE for a few seconds? I have little doubt it craps out.

By: therealdealsince1982

therealdealsince1982 — Tue, 10 Nov 2009 04:54:57 +0000

I have searched/googled quite a few webpages on javascript sleep/wait… and there is NO answer if you want javascript to “RUN, DELAY, RUN”… what most people got was either, “RUN, RUN(useless stuff), RUN” or “RUN, RUN + delayed RUN”….

So I ate some burgers and got thinking:::
here is a solution that works… but you have to chop up your running codes…:::

replace <.. with < to run..
//…………………………………..
//example1:

DISPLAY

//javascript sleep by “therealdealsince1982″; copyrighted 2009
//setInterval
var i = 0;

t=setInterval(“run()”,1000);

//………………………………
//example2:

DISPLAY

//javascript sleep by “therealdealsince1982″; copyrighted 2009
//setTimeout
var i = 0;

function flow() {
run(i);
i++; //code segment finished running, increment i; can put elsewhere
sleep(1000);
if (i==5) {clearTimeout(t);} //stops flow, must be after sleep()
}

function sleep(dur) {t=setTimeout(“flow()”,dur);} //starts flow control again after dur

flow(); //starts flow

//……………………………….
//example3:

DISPLAY

//javascript sleep by “therealdealsince1982″; copyrighted 2009
//setTimeout, switch
var i = 0;

function flow() {
switch(i)
{
case 0:
run(i);
sleep(1000);
break;
case 1:
run(i);
sleep(2000);
break;
case 5:
run(i);
clearTimeout(t); //stops flow
break;
default:
run(i);
sleep(3000);
break;
}
}

function sleep(dur) {t=setTimeout(“flow()”,dur);} //starts flow control again after dur

flow(); //starts flow control for first time…

By: Al

Al — Thu, 22 Oct 2009 19:31:01 +0000

This is a terrible implementation. The while loop will completely dominate the CPU and hang the browser until sleep is done. On Firefox, if you sleep for longer than 5 or 10 seconds, this will cause an ugly warning dialog because the browser will think the script is stuck in an infinite loop.

There is no JavaScript sleep() function. (Which I find to be a huge flaw with the langauge.) Instead, you should use setTimeout(). Google “JavaScript sleep” to find what other people have said on this topic, but a loop that polls the current time is NOT what you want.

By: Harish

Harish — Tue, 22 Sep 2009 04:56:03 +0000

hi,

Thanks a lot for the code. I think lots of people are looking for this. Btw where do I find the class file for this?

regards,
Harish

By: Mark

Mark — Tue, 17 Feb 2009 14:51:21 +0000

Hi Mike,

I couldn’t find anywhere to contact you so i thought i would do it through here. I know your blog is mainly on coding but noticed you posted some great tech posts such as the new mac video and thought a new video piece i am working on might be of interest to you. Its about a dysfunctional managers resistance to installing an ERP system. Although the video is really funny it does highlight some serious points.

http://www.k3scs.com/the-factory/

I thought it would point it out to you and if you have any feedback please let us know. Please also feel free to use the video.

Thanks

Mark