Create a simple 10 second countdown

JavascriptHtmlTimer

Javascript Problem Overview

I would like a line that says:

Your download will begin in (10, 9, 8, etc. Beginning on page load) seconds.

I already have the 10 second download text set up, and I have looked at other stackoverflow posts. They all include CSS, and Jquery. I would like just a Javascript/HTML timer.

No other requests have been made for a simple line stating "You're download will begin in x seconds". How would I do this?

Javascript Solutions

Solution 1 - Javascript

JavaScript has built in to it a function called setInterval, which takes two arguments - a function, callback and an integer, timeout. When called, setInterval will call the function you give it every timeout milliseconds.

For example, if you wanted to make an alert window every 500 milliseconds, you could do something like this.

function makeAlert(){ 
    alert("Popup window!");
};

setInterval(makeAlert, 500);

However, you don't have to name your function or declare it separately. Instead, you could define your function inline, like this.

setInterval(function(){ alert("Popup window!"); }, 500);

Once setInterval is called, it will run until you call clearInterval on the return value. This means that the previous example would just run infinitely. We can put all of this information together to make a progress bar that will update every second and after 10 seconds, stop updating.

var timeleft = 10;
var downloadTimer = setInterval(function(){
  if(timeleft <= 0){
    clearInterval(downloadTimer);
  }
  document.getElementById("progressBar").value = 10 - timeleft;
  timeleft -= 1;
}, 1000);


<progress value="0" max="10" id="progressBar"></progress>

Alternatively, this will create a text countdown.

var timeleft = 10;
var downloadTimer = setInterval(function(){
  if(timeleft <= 0){
    clearInterval(downloadTimer);
    document.getElementById("countdown").innerHTML = "Finished";
  } else {
    document.getElementById("countdown").innerHTML = timeleft + " seconds remaining";
  }
  timeleft -= 1;
}, 1000);


<div id="countdown"></div>

Solution 2 - Javascript

This does it in text. 

<p> The download will begin in <span id="countdowntimer">10 </span> Seconds</p>

<script type="text/javascript">
    var timeleft = 10;
    var downloadTimer = setInterval(function(){
    timeleft--;
    document.getElementById("countdowntimer").textContent = timeleft;
    if(timeleft <= 0)
        clearInterval(downloadTimer);
    },1000);
</script>

Solution 3 - Javascript

A solution using Promises, includes both progress bar & text countdown.

ProgressCountdown(10, 'pageBeginCountdown', 'pageBeginCountdownText').then(value => alert(`Page has started: ${value}.`));

function ProgressCountdown(timeleft, bar, text) {
  return new Promise((resolve, reject) => {
    var countdownTimer = setInterval(() => {
      timeleft--;

      document.getElementById(bar).value = timeleft;
      document.getElementById(text).textContent = timeleft;

      if (timeleft <= 0) {
        clearInterval(countdownTimer);
        resolve(true);
      }
    }, 1000);
  });
}


<div class="row begin-countdown">
  <div class="col-md-12 text-center">
    <progress value="10" max="10" id="pageBeginCountdown"></progress>
    <p> Begining in <span id="pageBeginCountdownText">10 </span> seconds</p>
  </div>
</div>

Solution 4 - Javascript

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>

Solution 5 - Javascript

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">0p0</span> <span class="value">SEC</span> </div>
</div>

Categories
Recommended Javascript Solutions
Recommended Html Solutions
Recommended Timer Solutions

Previous Solution:

Intellij JAVA_HOME variable

JavaIntellij Idea

Next Solution:

Transform a Counter object into a Pandas DataFrame

PythonPandasDataframeCounter

Attributions

All content for this solution is sourced from the original question on Stackoverflow.

The content on this page is licensed under the Attribution-ShareAlike 4.0 International (CC BY-SA 4.0) license.

Content TypeOriginal AuthorOriginal Content on Stackoverflow
QuestionJoseph Christian HefleyView Question on Stackoverflow
Solution 1 - JavascriptJames McDowellView Answer on Stackoverflow
Solution 2 - JavascriptTeddy KokerView Answer on Stackoverflow
Solution 3 - JavascripttreckstarView Answer on Stackoverflow
Solution 4 - JavascriptCodingEraView Answer on Stackoverflow
Solution 5 - Javascriptmahdi1095View Answer on Stackoverflow