I have a javascript timer everytime I refresh the page the timer wil reset

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When I refresh the page the timer reset, I want it to continue to count even I refresh or restart the browser. But it will continue to count when I clicked the start button again. Please help.

Here's my code.

HTML code

HTML

<pre><!DOCTYPE html>
<html lang="en">
    <head>
        <title>Timer</title>
        <script src="http://code.jquery.com/jquery-1.11.0.min.js"></script></script>
    </head>
<body>
        <span id="countup">00:00:00</span>
        <button type="button" id="attendance_button">Start</button>
</body>
</html>

JS code

<pre lang="Javascript"><pre><script type="text/javascript">
    (function(){
$("#attendance_button").click( function(){

    getlocalStoragetime();
});
})()

function getlocalStoragetime()
{
    var time = localStorage.getItem('timer') || "00:00:00",
        parts = time.split(':'),
        hours = +parts[0],
        minutes = +parts[1],
        seconds = +parts[2],
        span = $('#countup');

    function correctNum(num) {
        return (num<10)? ("0"+num):num;
    }

    var timer = setInterval(function(){
        seconds++;
        if(seconds > 59) {
            minutes++;
            seconds = 0;

            if(minutes > 59) {
                hours++;
                seconds = 0;
                minutes = 0;

                if(hours >= 24) {
                  alert("You're logged-in for 24 hours.");
                }
            }
        }
        var displayTime = correctNum(hours) + ":" + correctNum(minutes) + ":" + correctNum(seconds);
        localStorage.setItem('timer', displayTime);
        span.text(displayTime);
    }, 1000); 
}
</script>

What I have tried:

i tried to put it into a function(timer code) and just call that function but it won't work.

Posted 4-Mar-20 3:58am

_KS

Updated 23-May-22 2:10am

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OriginalGriff · Answer 1 · 2020-03-04T04:15:00

You need to learn how things work: when you refresh a page, your request a new copy of it from the server, and that discards everything that has been done to the page so far - and that includes timers. You can't start a timer that works even when the page it is running on has been discarded for any reason, unless you run the timer at the server instead of the client.

You could use a cookie to save the current timer value, and update that every time the timer ticks but that's a messy solution at best, and prone to "losing time" unless you are very careful how you do it.

Member 15646952 · Answer 2 · 2022-05-23T02:10:00

<!DOCTYPE html>

<title>timer

body {
background: #202020;
color: white;
}
button {
width: 100px;
height: 30px;
border: 3px solid white;
border-radius: 50px;
background: #202020;
color: white;
cursor: pointer;
/*outline: none;*/
}
.font {
color: white;
}

#stopwatch {
font-size: 50px;
position: absolute;
top: 50%;
left: 50%;
/*left-right top-bottom*/
transform: translate(-50%, -60%);
}
#buttons {
position: absolute;
top: 50%;
left: 50%;
/*left-right top-bottom*/
transform: translate(-55%, -1%);
}
#buttons li {
display: inline;
padding-left: 10px;
}

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I have a javascript timer everytime I refresh the page the timer wil reset

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