Java script count up timer

Question

I have a working count down timer in java script and it count down from 120 seconds to 0, now I want to change it to becomes a COUNT UP timer, try few thing still not work. could anyone help to change it to COUNT UP instead of COUNT DOWN.

Here is the code below:

<script type="text/javascript" >
var m = 0;
var s = 120;
var timer_container = document.getElementById("survey-timer");
timer_container.innerHTML = s + "." + m;

function timer() {
    if (m<=0) {
        m = 9;
        s -= 1;
    }
    if(s>=0) {
        m -= 1;
        timer_container.innerHTML = s + "." + m;
        setTimeout(timer,100);
    }
}
</script>

Could you post what you did try, then we can see if it can be fixed! — Peter Hull
– Peter Hull, Commented Apr 29, 2013 at 14:25

rahul maindargi · Accepted Answer · 2013-04-29 14:26:06Z

1

You want to count up from 120 or from 0.. below one just count up from 0..

   <script type="text/javascript" >
    var m=0
    var s=0
    var timer_container=document.getElementById("survey-timer");
    timer_container.innerHTML=s+"."+m;

    function timer(){
    if (m>=9){
        m=-1;
        s+=1;
    }
    if(s>=0){
        m+=1;
        timer_container.innerHTML=s+"."+m;
        setTimeout(timer,100);
    }
    }
    </script>

Here is working example from jsfiddle

answered Apr 29, 2013 at 14:26

rahul maindargi

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Comments

Peter Hull · Accepted Answer · 2018-09-04 11:26:24Z

1

If it were me, I would do this:

var base = new Date();
var timer_container = document.getElementById("survey-timer");

timer();

function timer() {
  var now = new Date();
  // elapsed time in seconds
  var elapsed = (now - base) / 1000.0;
  timer_container.innerHTML = elapsed.toFixed(1);
  setTimeout(timer, 100);
}

<div id="survey-timer">&nbsp;</div>

Because I think the technique used in the question and in rahul's answer might 'slip' if the timeout were delayed for whatever reason.

edited Sep 4, 2018 at 11:26

answered Apr 29, 2013 at 14:48

Peter Hull

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1 Comment

user1985788 Over a year ago

Thanks, will try your version.

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