javascript php web-applications countdowntimer web-application-design

countdown timer reloading again on refreshing

countdown timer code in javascript. But it is restarting again when the page is refreshed. I want the timer should continue even though it is restarted.

Help me to deal with this problem as i am beginner this is my first application i need some detail inputs from you.

`
<body>
<div id="divCounter"></div>
<script type="text/javascript">

var hoursleft = 0;
var minutesleft = 35;           // you can change these values to any value greater than 0
var secondsleft = 0;

var finishedtext = "Countdown finished!" // text that appears when the countdown reaches 0
var end = new Date();

end.setMinutes(end.getMinutes()+minutesleft);
end.setSeconds(end.getSeconds()+secondsleft);


if(localStorage.getItem("counter")){

    var value = localStorage.getItem("counter");

}else{
  var value = 0;
}


var counter = function (){


    var now = new Date();
var diff = end - now;
diff = new Date(diff);

var sec = diff.getSeconds();
var min = diff.getMinutes();

if (min < 10){
    min = "0" + min;
}
if (sec < 10){
    sec = "0" + sec;
}

if(now >= end){
    clearTimeout(timerID);
    document.getElementById('divCounter').innerHTML = finishedtext;
}
else{
    var value = min + ":" + sec;
//document.getElementById('divCounter').innerHTML = min + ":" + sec;
localStorage.setItem("counter", JSON.stringify(value));
}      

 // timerID = setTimeout("cd()", 1000);
// value = JSON.parse(localStorage.getItem("counter"));
//$('#divCounter').append(value);
document.getElementById('divCounter').innerHTML = value; 
 }





 var interval = setInterval(function (){counter();}, 1000);
 </script>
 </body>
 `

Solution

countdown timer for whatever time you want. It does not restart when you refresh the page.

<body>
<div id="divCounter"></div>


<script>
//var hoursleft = 0;
var minutesleft = 0; //give minutes you wish
var secondsleft = 30; // give seconds you wish
var finishedtext = "Countdown finished!";
var end1;
if(localStorage.getItem("end1")) {
end1 = new Date(localStorage.getItem("end1"));
} else {
end1 = new Date();
end1.setMinutes(end1.getMinutes()+minutesleft);
end1.setSeconds(end1.getSeconds()+secondsleft);

}
var counter = function () {
var now = new Date();
var diff = end1 - now;

diff = new Date(diff);

var milliseconds = parseInt((diff%1000)/100)
    var sec = parseInt((diff/1000)%60)
    var mins = parseInt((diff/(1000*60))%60)
    //var hours = parseInt((diff/(1000*60*60))%24);

if (mins < 10) {
    mins = "0" + mins;
}
if (sec < 10) { 
    sec = "0" + sec;
}     
if(now >= end1) {     
    clearTimeout(interval);
   // localStorage.setItem("end", null);
     localStorage.removeItem("end1");
     localStorage.clear();
    document.getElementById('divCounter').innerHTML = finishedtext;
     if(confirm("TIME UP!"))
     window.location.href= "timeup.php";
} else {
    var value = mins + ":" + sec;
    localStorage.setItem("end1", end1);
    document.getElementById('divCounter').innerHTML = value;
}
}
var interval = setInterval(counter, 1000);
</script>
</body>