Javasacript Countdown timer in Days, Hours, Minute, Seconds

Question

I\'m trying to create a time-based count down clock. It is not based upon current_dates. The initial time that will be pulled will be from a separate php file. This will be

Answer 1

Here is my worked out and tested example, based on your code

<span id="countdown"></span>
<script>
     var current_level = 3002;

     function timer() {

        var days = Math.floor(current_level/86400);
        var remainingDays = current_level - (days * 86400);

        //if (days <= 0){
        //    days = current_level;
        //}

        var hours = Math.floor(remainingDays/3600);
        var remainingHours = remainingDays - (hours * 3600);

        //if (hours >= 24){
        //     hours = 23;
        //}

        var minutes = Math.floor(remainingHours/60);
        var remainingMinutes = remainingHours - (minutes * 60);

        //if (minutes >= 60) {
        //     minutes = 59;
        //}

        var seconds = remainingMinutes;

        document.getElementById('countdown').innerHTML = days + ":" + hours + ":" + minutes + ":" + seconds;

        //if (seconds == 0) {
        //    clearInterval(countdownTimer);
        //     document.getElementById('countdown').innerHTML = "Completed";
        //}

        current_level--;
     }
     var countdownTimer = setInterval(timer, 1000);
</script>

Answer 2

Personally I would use the jquery countdown timer integration. It is simple and having number of options to display in different formats. Since I am fairly new to JS as well, this was the easiest way I found to get a count/timer.

http://keith-wood.name/countdown.html

Answer 3

Thanks to OP Phoenix Ryan I made the following React component using your solution. Many thanks!

const Panel = ({label, n}) => (
  <div className="panel">
    <small>{label}</small>
    <span>{n < 10 ? "0" + n : n}</span>
  </div>
)

const App = () => {
  const [secondsLeft, setSecondsLeft] = React.useState(86403)

  React.useEffect(() => {
    const interval = setInterval(() => {
      if (secondsLeft == 0) {
        clearInterval(interval);
        console.log('Times up!')
      } else {
        setSecondsLeft(secondsLeft - 1)
      }
    }, 1000)
    return () => clearInterval(interval)
  })
  
  const days = Math.floor(secondsLeft/24/60/60);
  const hoursLeft = Math.floor((secondsLeft) - (days*86400));
  const hours = Math.floor(hoursLeft/3600);
  const minutesLeft = Math.floor((hoursLeft) - (hours*3600));
  const minutes = Math.floor(minutesLeft/60);
  const seconds = secondsLeft % 60;
    
  return (
    <div className="root">
      <Panel label="Days" n={days} />
      <Panel label="Hours" n={hours} />
      <Panel label="Minutes" n={minutes} />
      <Panel label="Seconds" n={seconds} />
    </div>
  )
}

ReactDOM.render(
  <App/>,
  document.getElementById('root')
)

.root {
  display: flex;
}

.panel {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin-right: 8px;
  color: #444;
}

.panel small {
  font-size: 9px;
  text-transform: uppercase;
  font-family: sans-serif;
}

.panel span {
  font-size: 3em;
  font-weight: bold;
  font-family: serif;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/react/16.13.1/umd/react.production.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/16.13.1/umd/react-dom.production.min.js"></script>
<div id="root"></div>

Answer 4

I finally got back to looking at this and re-wrote the code and this works like a charm.

var upgradeTime = 172801;
var seconds = upgradeTime;
function timer() {
  var days        = Math.floor(seconds/24/60/60);
  var hoursLeft   = Math.floor((seconds) - (days*86400));
  var hours       = Math.floor(hoursLeft/3600);
  var minutesLeft = Math.floor((hoursLeft) - (hours*3600));
  var minutes     = Math.floor(minutesLeft/60);
  var remainingSeconds = seconds % 60;
  function pad(n) {
    return (n < 10 ? "0" + n : n);
  }
  document.getElementById('countdown').innerHTML = pad(days) + ":" + pad(hours) + ":" + pad(minutes) + ":" + pad(remainingSeconds);
  if (seconds == 0) {
    clearInterval(countdownTimer);
    document.getElementById('countdown').innerHTML = "Completed";
  } else {
    seconds--;
  }
}
var countdownTimer = setInterval('timer()', 1000);

<span id="countdown" class="timer"></span>

Answer 5

This code will help you deal with the issue of handling multiple timer on the single page

    var seconds_inputs =  document.getElementsByClassName('deal_left_seconds');
    var total_timers = seconds_inputs.length;
    for ( var i = 0; i < total_timers; i++){
        var str_seconds = 'seconds_'; var str_seconds_prod_id = 'seconds_prod_id_';
        var seconds_prod_id = seconds_inputs[i].getAttribute('data-value');
        var cal_seconds = seconds_inputs[i].getAttribute('value');

        eval('var ' + str_seconds + seconds_prod_id + '= ' + cal_seconds + ';');
        eval('var ' + str_seconds_prod_id + seconds_prod_id + '= ' + seconds_prod_id + ';');
    }
    function timer() {
        for ( var i = 0; i < total_timers; i++) {
            var seconds_prod_id = seconds_inputs[i].getAttribute('data-value');

            var days = Math.floor(eval('seconds_'+seconds_prod_id) / 24 / 60 / 60);
            var hoursLeft = Math.floor((eval('seconds_'+seconds_prod_id)) - (days * 86400));
            var hours = Math.floor(hoursLeft / 3600);
            var minutesLeft = Math.floor((hoursLeft) - (hours * 3600));
            var minutes = Math.floor(minutesLeft / 60);
            var remainingSeconds = eval('seconds_'+seconds_prod_id) % 60;

            function pad(n) {
                return (n < 10 ? "0" + n : n);
            }
            document.getElementById('deal_days_' + seconds_prod_id).innerHTML = pad(days);
            document.getElementById('deal_hrs_' + seconds_prod_id).innerHTML = pad(hours);
            document.getElementById('deal_min_' + seconds_prod_id).innerHTML = pad(minutes);
            document.getElementById('deal_sec_' + seconds_prod_id).innerHTML = pad(remainingSeconds);

            if (eval('seconds_'+ seconds_prod_id) == 0) {
                clearInterval(countdownTimer);
                document.getElementById('deal_days_' + seconds_prod_id).innerHTML = document.getElementById('deal_hrs_' + seconds_prod_id).innerHTML = document.getElementById('deal_min_' + seconds_prod_id).innerHTML = document.getElementById('deal_sec_' + seconds_prod_id).innerHTML = pad(0);
            } else {
                var value = eval('seconds_'+seconds_prod_id);
                value--;
                eval('seconds_' + seconds_prod_id + '= ' + value + ';');
            }
        }
    }

    var countdownTimer = setInterval('timer()', 1000);

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<input type="hidden" class="deal_left_seconds" data-value="1" value="10">
<div class="box-wrapper">
    <div class="date box"> <span class="key" id="deal_days_1">00</span> <span class="value">DAYS</span> </div>
</div>
<div class="box-wrapper">
    <div class="hour box"> <span class="key" id="deal_hrs_1">00</span> <span class="value">HRS</span> </div>
</div>
<div class="box-wrapper">
    <div class="minutes box"> <span class="key" id="deal_min_1">00</span> <span class="value">MINS</span> </div>
</div>
<div class="box-wrapper hidden-md">
    <div class="seconds box"> <span class="key" id="deal_sec_1">00</span> <span class="value">SEC</span> </div>
</div>