Stopwatch using JavaScript?
Last updated
Last updated
<h1>
<span id="hour">00</span> :
<span id="min">00</span> :
<span id="sec">00</span> :
<span id="milisec">00</span>
</h1>
<button onclick="startStop()" id="start">Start</button>
<button onclick="reset()">Reset</button>
var x;
var startstop = 0;
function startStop() { /* Toggle StartStop */
startstop = startstop + 1;
if (startstop === 1) {
start();
document.getElementById("start").innerHTML = "Stop";
} else if (startstop === 2) {
document.getElementById("start").innerHTML = "Start";
startstop = 0;
stop();
}
}
function start() {
x = setInterval(timer, 10);
} /* Start */
function stop() {
clearInterval(x);
} /* Stop */
var milisec = 0;
var sec = 0; /* holds incrementing value */
var min = 0;
var hour = 0;
/* Contains and outputs returned value of function checkTime */
var miliSecOut = 0;
var secOut = 0;
var minOut = 0;
var hourOut = 0;
/* Output variable End */
function timer() {
/* Main Timer */
miliSecOut = checkTime(milisec);
secOut = checkTime(sec);
minOut = checkTime(min);
hourOut = checkTime(hour);
milisec = ++milisec;
if (milisec === 100) {
milisec = 0;
sec = ++sec;
}
if (sec == 60) {
min = ++min;
sec = 0;
}
if (min == 60) {
min = 0;
hour = ++hour;
}
document.getElementById("milisec").innerHTML = miliSecOut;
document.getElementById("sec").innerHTML = secOut;
document.getElementById("min").innerHTML = minOut;
document.getElementById("hour").innerHTML = hourOut;
}
/* Adds 0 when value is <10 */
function checkTime(i) {
if (i < 10) {
i = "0" + i;
}
return i;
}
function reset() {
/*Reset*/
milisec = 0;
sec = 0;
min = 0
hour = 0;
document.getElementById("milisec").innerHTML = "00";
document.getElementById("sec").innerHTML = "00";
document.getElementById("min").innerHTML = "00";
document.getElementById("hour").innerHTML = "00";
}
Output
let output = document.getElementById('stopwatch');
let ms = 0;
let sec = 0;
let min = 0;
function timer() {
ms++;
if(ms >= 100){
sec++
ms = 0
}
if(sec === 60){
min++
sec = 0
}
if(min === 60){
ms, sec, min = 0;
}
//Doing some string interpolation
let milli = ms < 10 ? `0`+ ms : ms;
let seconds = sec < 10 ? `0`+ sec : sec;
let minute = min < 10 ? `0` + min : min;
let timer= `${minute}:${seconds}:${milli}`;
output.innerHTML =timer;
};
//Start timer
function start(){
time = setInterval(timer,10);
}
//stop timer
function stop(){
clearInterval(time)
}
//reset timer
function reset(){
ms = 0;
sec = 0;
min = 0;
output.innerHTML = `00:00:00`
}
const startBtn = document.getElementById('startBtn');
const stopBtn = document.getElementById('stopBtn');
const resetBtn = document.getElementById('resetBtn');
startBtn.addEventListener('click',start,false);
stopBtn.addEventListener('click',stop,false);
resetBtn.addEventListener('click',reset,false);
<p class="stopwatch" id="stopwatch">
<!-- stopwatch goes here -->
</p>
<button class="btn-start" id="startBtn">Start</button>
<button class="btn-stop" id="stopBtn">Stop</button>
<button class="btn-reset" id="resetBtn">Reset</button>
OutPut