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Re: setInterval

Newsgroups comp.lang.javascript
Subject Re: setInterval
From "Evertjan." <exxjxw.hannivoort@inter.nl.net>
References <6cb902b0-8913-4b65-954d-5d9f0e60ee95@googlegroups.com> <lyrqf45qcj5e$.1n5qtbbdcd9n1.dlg@40tude.net>
Date 2017-02-06 16:00 +0100
Message-ID <XnsA714A2E97D7F5eejj99@194.109.6.166> (permalink)

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JJ <jj4public@vfemail.net> wrote on 06 Feb 2017 in comp.lang.javascript:

> On Sun, 5 Feb 2017 23:26:36 -0800 (PST), jonas.thornvall@gmail.com wrote:
>> I find setInterval incredible confusing to use?
>> Why does not mycount change?
>> 
>> function DEMO(){
>>   mycount=50;
>>   document.getElementById('mysubset').selectedIndex=1;
>>   var interval_1 = setInterval("COUNTDOWN();",1000);
>> }     
>> 
>> function COUNTDOWN(){
>>   AUTOGRAPH();
>>  document.NoLinks.linkval.value =mycount--;
>>  if(mycount<1) clearInterval(interval_1);
>> }
> 
> You've saved the timer interval ID into `interval_1` variable. But since
> that variable is a local variable, it's disposed when `DEMO()` function
> returns.
> 
> In `COUNTDOWN()` function, you're referring to a non existent `interval_1`
> identifier.

[Also mycount must be declared global] 

This works fine here:

<script type='text/javascript'> 'use strict'

var myInt;
let mycount = 20;
demo();

function demo() {
	myInt = setInterval(countdown, 300);
};

function countdown() {
	console.log(mycount);
	mycount--;
	if (mycount<1) clearInterval(myInt);
};

</script>

Simpler, imho, is:

<script type='text/javascript'> 'use strict'

let mycount = 20;
countdown();

function countdown() {
	console.log(mycount);
	if (--mycount) setTimeout(countdown, 300);
};

</script>



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

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setInterval jonas.thornvall@gmail.com - 2017-02-05 23:26 -0800
  Re: setInterval jonas.thornvall@gmail.com - 2017-02-05 23:30 -0800
    Re: setInterval jonas.thornvall@gmail.com - 2017-02-06 00:17 -0800
      Re: setInterval jonas.thornvall@gmail.com - 2017-02-06 00:24 -0800
        Re: setInterval jonas.thornvall@gmail.com - 2017-02-06 00:36 -0800
          Re: setInterval jonas.thornvall@gmail.com - 2017-02-06 01:10 -0800
            Re: setInterval jonas.thornvall@gmail.com - 2017-02-06 01:20 -0800
              Re: setInterval Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-02-06 14:10 +0000
                Re: setInterval jonas.thornvall@gmail.com - 2017-02-06 11:25 -0800
                Re: setInterval Ben Bacarisse <ben.usenet@bsb.me.uk> - 2017-02-06 21:12 +0000
                Re: setInterval Silvio <silvio@internet.com> - 2017-02-06 22:15 +0100
                Re: setInterval jonas.thornvall@gmail.com - 2017-02-06 14:17 -0800
                Re: setInterval "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2017-02-06 23:50 +0100
                Re: setInterval jonas.thornvall@gmail.com - 2017-02-06 20:57 -0800
                Re: setInterval jonas.thornvall@gmail.com - 2017-02-06 21:15 -0800
                Re: setInterval "Julio P. Di Egidio" <julio@diegidio.name> - 2017-02-07 06:22 +0100
                Re: setInterval jonas.thornvall@gmail.com - 2017-02-06 22:09 -0800
                Re: setInterval Julio Di Egidio <julio@diegidio.name> - 2017-02-06 22:27 -0800
                Re: setInterval jonas.thornvall@gmail.com - 2017-02-06 22:45 -0800
                Re: setInterval Jake Jarvis <pig_in_shoes@yahoo.com> - 2017-02-07 11:13 +0100
                Re: setInterval Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2017-02-07 17:23 +0100
                Re: setInterval Julio Di Egidio <julio@diegidio.name> - 2017-02-07 11:54 -0800
                Re: setInterval Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2017-02-07 21:54 +0100
                Re: setInterval Julio Di Egidio <julio@diegidio.name> - 2017-02-07 13:50 -0800
                Re: setInterval Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2017-02-07 23:19 +0100
                Re: setInterval Julio Di Egidio <julio@diegidio.name> - 2017-02-07 15:33 -0800
                Re: setInterval Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2017-02-09 00:23 +0100
                Re: setInterval "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2017-02-07 11:33 +0100
                Re: setInterval "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2017-02-06 23:28 +0100
                Re: setInterval "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2017-02-06 23:26 +0100
                Re: setInterval "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2017-02-06 23:24 +0100
                Re: setInterval Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2017-02-07 04:36 +0100
            Re: setInterval Silvio <silvio@internet.com> - 2017-02-06 16:13 +0100
              Re: setInterval jonas.thornvall@gmail.com - 2017-02-06 12:10 -0800
                Re: setInterval jonas.thornvall@gmail.com - 2017-02-06 12:27 -0800
                Re: setInterval "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2017-02-06 23:16 +0100
                Re: setInterval jonas.thornvall@gmail.com - 2017-02-06 14:28 -0800
                Re: setInterval "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2017-02-06 23:45 +0100
                Re: setInterval Tim Streater <timstreater@greenbee.net> - 2017-02-06 21:25 +0000
                Re: setInterval "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2017-02-06 23:19 +0100
  Re: setInterval JJ <jj4public@vfemail.net> - 2017-02-06 20:07 +0700
    Re: setInterval "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2017-02-06 16:00 +0100
      Re: setInterval jonas.thornvall@gmail.com - 2017-02-06 11:06 -0800
        Re: setInterval "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2017-02-06 23:08 +0100
          Re: setInterval jonas.thornvall@gmail.com - 2017-02-06 14:26 -0800
            Re: setInterval "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2017-02-06 23:41 +0100

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