Develop Reference

Countdown Timer to Add extra 2 minutes

I have created a countdown timer and am trying to add 2 minutes into the existing timer to extend the timer.
My Code
function CountDownTimer(duration, granularity) {
this.duration = duration;
this.granularity = granularity || 1000;
this.tickFtns = [];
this.running = false;
}
CountDownTimer.prototype.start = function() {
if (this.running) {
return;
}
this.running = true;
var start = Date.now(),
that = this,
diff, obj;
(function timer() {
diff = that.duration - (((Date.now() - start) / 1000) | 0);
if (diff > 0) {
setTimeout(timer, that.granularity);
} else {
diff = 0;
that.running = false;
}
obj = CountDownTimer.parse(diff);
that.tickFtns.forEach(function(ftn) {
ftn.call(this, obj.minutes, obj.seconds);
}, that);
}());
};
CountDownTimer.prototype.onTick = function(ftn) {
if (typeof ftn === 'function') {
this.tickFtns.push(ftn);
}
return this;
};
CountDownTimer.prototype.expired = function() {
return !this.running;
};
CountDownTimer.parse = function(seconds) {
return {
'minutes': (seconds / 60) | 0,
'seconds': (seconds % 60) | 0
};
};
$(document).ready(function() {
var counter = 0;
var display = document.querySelector('#time'),
//timer = new CountDownTimer(600);
timer = new CountDownTimer(125); // for debug
timer.onTick(format).onTick(restart).start();
function restart() {
if (this.expired()) {
alert("Expired");
}
}
function format(minutes, seconds) {
minutes = minutes < 10 ? "0" + minutes : minutes;
seconds = seconds < 10 ? "0" + seconds : seconds;
display.textContent = minutes + ':' + seconds;
if (minutes < 2) {
if (counter == 0) {
alert("Extending Time");
counter++;
}
}
}
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<span id="time"></span> minutes
I managed to trigger an event that after 2 minutes will show an alert that the time will be extended, but so far, I can't think of any method or functions I can use to add the extra time. Is there any way I can do this?

Add code as following:
CountDownTimer.prototype.reset = function (duration) {
this.duration = duration;
}
and rewrite function format as :
function format(minutes, seconds) {
minutes = minutes < 10 ? "0" + minutes : minutes;
seconds = seconds < 10 ? "0" + seconds : seconds;
display.textContent = minutes + ':' + seconds;
if (minutes < 2) {
if (counter == 0) {
//alert("Extending Time");
timer.reset(timer.duration + 120);
counter++;
}
}
}

You can add code in CountDownTimer.prototype.start before setTimeout like:
this.instance = setTimeout(...)
add function:
CountDownTimer.prototype.kill = function() {
clearTimeout(this.instance)
}
call function kill to stop timer permanently.

Creating a stopwatch from scratch in JavaScript

By creating variables for milliseconds, seconds, and minutes, I wanted to make a little stopwatch project. The onClick for the button I have is for theTimer():
var milli = 0;
var seconds = 0;
var minutes = 0;
var onOff = 0;
var txtMilli = document.getElementById("txtMilli");
var txtSeconds = document.getElementById("txtSeconds");
var txtMinutes = document.getElementById("txtMinutes");
function theTimer()
{
if (onOff == 0) {
onOff = 1;
timer = setInterval("startCounting()",1);
}
if (onOff == 1) {
onOff == 0;
clearInterval(timer);
}
}
function startCounting()
{
if (milli >999)
{
milli = 0; if (seconds <60) {seconds +=1}
}
else
{
milli +=1;
}
if (seconds >59)
{
seconds = 0; minutes += 1;
}
if (milli > 10)
{
txtMilli.innerHTML = "0" + milli;
}
if (milli < 10)
{
txtMilli.innerHTML = "" + milli;
}
}
Nothing shows up in the console, the problem is that the DIVs never change from 0 when running it.

I managed to fix your code like so:
var milli = 0;
var seconds = 0;
var minutes = 0;
var onOff = 0;
var txtMilli = document.getElementById("txtMilli");
var txtSeconds = document.getElementById("txtSeconds");
var txtMinutes = document.getElementById("txtMinutes");
function startCounting(){
if (milli >999) { milli = 0; if (seconds <60) {seconds +=1} }
else {milli +=1;}
if (seconds >59) {seconds = 0; minutes += 1;}
if (milli > 10) {txtMilli.innerHTML = "0" + milli;}
if (milli < 10) {txtMilli.innerHTML = "" + milli;}
}
function theTimer(){
if (onOff == 0) {
onOff = 1;
timer = setInterval(startCounting, 1);
} else if (onOff == 1) {
onOff = 0;
clearInterval(timer);
}
}
myButton.onclick = theTimer;
There was a bug inside theTimer where you'd set onOff to 1, then immediately check to see if it was 1 and set it back to 0. I fixed this by using else if.
I also changed onOff == 0 (which is a comparison) to onOff = 0 (which is an assignment).
Working JSFiddle: https://jsfiddle.net/k83tvfhc/

Button Click shouldn't stack the function it triggers but it does

I'm making an timer in Javascript which already works well the only problem is when I keep hitting the
"Start" button it keeps stacking the count function and will count at an higher and higher speed. Tried multiple things to stop it but can't manage myself.
JS:
var startknop = document.getElementById("start");
var stopknop = document.getElementById("stop");
var hour = 0;
var min = 0;
var sec = 0;
startknop.onclick = function()
{
intervalId = setInterval(count, 1000);
}
stopknop.onclick = function()
{
clearInterval(intervalId);
}
counter.innerHTML = hour + "0:" + min + "0:" + sec + "0";
function count() {
sec++;
if(sec <= 9)
{
var seco = "0" + sec;
}
else
{
seco = sec;
}
if(min <= 9)
{
var mino = "0" + min;
}
else
{
mino = sec;
}
if(hour <= 9)
{
var houro = "0" + hour;
}
else
{
houro = hour;
}
if(sec == 60){
sec = 0;
min += 1;
}
if(min == 60){
min = 0;
hour += 1;
}
counter.innerHTML = houro + ":" + mino + ":" + seco;
}

var running = false;
startknop.onclick = function()
{
if(!running)
{
running=true;
intervalId = setInterval(count, 1000);
}
}
when timer is finished set running false.

Wrap the setInterval in an if block with a boolean to check if initialised. You are starting multiple timers, so stop only stops the last one assigned to your global variable. You could also set intervalId to -1 and do a check on it being >0, setting it back to -1 after the clearInterval call.

Java script Timer CountDown

I'm creating java script count down timer and it works up to 60 seconds correctly and after that its not working.
var counter = setInterval(timer, 1000); //1000 will run it every 1 second
function timer() {
var val = document.getElementById("LabelTimer");
if (val != null) {
var PopUpTimeDuration = 2;
countdown(parseInt(PopUpTimeDuration));
}
}
function countdown(minutes) {
var seconds = 60;
var mins = minutes
function tick() {
var counterVal = document.getElementById("lblCountDown");
var current_minutes = mins - 1
seconds--;
counterVal.innerHTML =
current_minutes.toString() + ":" + (seconds < 10 ? "0" : "") + String(seconds);
var result = counterVal.innerHTML;
if (result == "0:00") {
clearInterval(counter);
CloseIdlePage();
}
if (seconds > 0) {
setTimeout(tick, 1000);
} else {
debugger;
if (mins >= 1) {
countdown(mins - 1);
}
}
}
tick();
}
When i run this program this start 1:59 and it continues up to 1:01. after that this display value rest to 1:59. (not 0:59). what i did wrong in here?
Fiddle demo is in Here: in here you can see two values are blinking each other

Here's how I'd implement this. Hopefully the comments are sufficient. It needs an element in the page with ID "counterDiv" to write the values to.
function quickCount(mins) {
// Keep some values in a closure
var el = document.getElementById('counterDiv');
var secs = 0;
// Helper to pad single digit numbers
function z(n){return (n<10? '0':'') + n}
// Keep a reference to the interval
var timer = setInterval(function() {
// Write the values
el.innerHTML = mins + ':' + z(secs);
// Decremement seconds
--secs;
// If finished a minute, decrement minut
if (secs < 0) {
if (mins) {
--mins;
secs = 59;
// If finsihed minutes too, cancel timer
} else {
timer && clearInterval(timer);
}
}
// Run at about every second
}, 1000);
}
window.onload = function() {
quickCount(2);
}
HTH

<head>
<script type="text/javascript">
function timer()
{
var val = document.getElementById("LabelTimer");
if (val !== null)
{
var PopUpTimeDuration = 2;
countdown(parseInt(PopUpTimeDuration));
}
}
function countdown(minutes)
{
var seconds = 60;
var mins = minutes;
function tick()
{
var counterVal = document.getElementById("lblCountDown");
var current_minutes = mins - 1;
seconds--;
var t=current_minutes.toString() + ":" + (seconds < 10 ? "0" : "") + String(seconds);
counterVal.value = t;
var result = counterVal.innerHTML;
if (result === "0:00")
{
CloseIdlePage();
}
if (seconds > 0)
{
setTimeout(tick, 1000);
}
else
{
if (mins > 1)
{
countdown(mins - 1);
}
}
}
tick();
}
</script>
</head>
<body>
<div>TODO write content</div>
<input type="text" id="LabelTimer" value="yooo">
<input type="text" id="lblCountDown">
<input type="button" value="try" onclick="timer();" />
</body>

I resolved this as follows:
var counter = setInterval(timer, 1000); //1000 will run it every 1 second
var IsFunctionCalled = false;
function timer() {
var val = document.getElementById("LabelTimer");
if (val != null) {
var PopUpTimeDuration = 2;
if (IsFunctionCalled == false) {
IsFunctionCalled = true
countdown(parseInt(PopUpTimeDuration));
}
}
}
function countdown(minutes) {
var seconds = 60;
var mins = minutes
function tick() {
var counterVal = document.getElementById("lblCountDown");
var current_minutes = mins - 1
seconds--;
counterVal.innerHTML =
current_minutes.toString() + ":" + (seconds < 10 ? "0" : "") + String(seconds);
var result = counterVal.innerHTML;
if (result == "0:00") {
clearInterval(counter);
CloseIdlePage();
}
if (seconds > 0) {
setTimeout(tick, 1000);
// tick()
} else {
if (mins >= 1) {
countdown(mins - 1);
}
}
}
tick();
}
See here for Demo

How to show milliseconds in count down timer javascript

I have a javascript code that displays a count down timer from 5 minutes.
This is the code
var mins
var secs;
function cd() {
mins = 1 * m("05"); // change minutes here
secs = 0 + s(":00"); // change seconds here (always add an additional second to your total)
redo();
}
function m(obj) {
for(var i = 0; i < obj.length; i++) {
if(obj.substring(i, i + 1) == ":")
break;
}
return(obj.substring(0, i));
}
function s(obj) {
for(var i = 0; i < obj.length; i++) {
if(obj.substring(i, i + 1) == ":")
break;
}
return(obj.substring(i + 1, obj.length));
}
function dis(mins,secs) {
var disp;
if(mins <= 9) {
disp = " 0";
} else {
disp = " ";
}
disp += mins + ":";
if(secs <= 9) {
disp += "0" + secs;
} else {
disp += secs;
}
return(disp);
}
function redo() {
secs--;
if(secs == -1) {
secs = 59;
mins--;
}
var timerStr = dis(mins,secs);
$("#countDownTimer").text(timerStr); // setup additional displays here.
if((mins == 0) && (secs == 0)) {
} else {
cd = setTimeout("redo()",1);
}
}
function init() {
cd();
}
window.onload = init;
How can i change the script to show milliseconds too
or is there any simple script to show the count down timer including minutes:seconds:milliseconds

I reworked the code to include milliseconds. Also make sure the setTimer is set correctly.
var mins
var secs;
var ms;
function cd() {
mins = 1 * m("05"); // change minutes here
secs = 0 + s(":00"); // change seconds here (always add an additional second to your total)
ms = 0 + ms(":00");//change millisecons here
redo();
}
function m(obj) {
for(var i = 0; i < obj.length; i++) {
if(obj.substring(i, i + 1) == ":")
break;
}
return(obj.substring(0, i));
}
function s(obj) {
for(var i = 0; i < obj.length; i++) {
if(obj.substring(i, i + 1) == ":")
break;
}
return(obj.substring(i + 1, obj.length));
}
function ms(obj) {
for(var i = 0; i < obj.length; i++) {
if(obj.substring(i, i + 1) == ":")
break;
}
return(obj.substring(i + 1, obj.length));
}
function dis(mins,secs,ms) {
var disp;
if(mins <= 9) {
disp = " 0";
} else {
disp = " ";
}
disp += mins + ":";
if(secs <= 9) {
disp += "0" + secs;
} else {
disp += secs + ":";
}
if(ms <= 9) {
disp += "0" + ms;
} else {
disp += ms;
}
return(disp);
}
function redo() {
ms--;
if(ms == -1) {
ms = 99;
secs--;
}
if(secs == -1) {
secs = 59;
mins--;
}
var timerStr = dis(mins,secs,ms);
document.getElementById('countdown_fld').innerText=timerStr; // setup additional displays here.
if((mins == 0) && (secs == 0) && (ms == 0)) {
} else {
cd = setTimeout("redo()",10); //make sure to set the timer right
}
}
function init() {
cd();
}

You're calling the timeout with a parameter of 1, which means 1millisecond per timer 'event', but you're treating that millisecond event as a full second in your redo() function.
redo() should be:
function redo() {
s -= 0.001; // subtract 1 millisecond
if (s < 0) {
secs = 59.999;
mins--;
}
}
and so on. However, given that running this code every millisecond is going to put a fairly heavy load on the browser, and will not run with exact millisecond precision. What you should be doing is keeping track of TIME - when you start the countdown, record the current system time using the Date() object, which has millisecond precision.
Invoke your redo() at some longer interval than milliseconds (say, every 200ms / 0.2 seconds), and then subtract the system time at that point from the start time of the timer.

How about using one of the many jQuery countdown plugins out there, such as http://keith-wood.name/countdown.html or http://code.google.com/p/jquery-countdown/?
Upon further inspection:
jQuery 1 minute countdown with milliseconds and callback
javascript countdown with showing milliseconds