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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<title>TIMER</title>
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<style>
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body {
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display:flex; align-items:center; justify-content:center;
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min-height:100vh; margin:0;
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font-size:3em; font-family:monospace;
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}
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input {
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padding:0; border:0; outline:none; background:none;
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font-size:inherit; font-family:monospace; width:8em;
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}
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</style>
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</head>
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<body>
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<div>
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T ‐ <input type="text" id="time" placeholder="hh : mm : ss">
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</div>
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<script>
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var input = document.getElementById('time');
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var submit = document.getElementById('submit');
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var seconds = 0;
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var interval; // varibale holding setInterval
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input.addEventListener("keyup", function(event) {
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if (event.keyCode === 13) {
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event.preventDefault();
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if (!getTime(input)) {
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input.blur();
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startCounter();
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}
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}
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});
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function getTime(input){
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var hms = input.value;
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var t = hms.split(':');
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if (t.length == 3) {
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seconds = (+t[0]) * 60 * 60 + (+t[1]) * 60 + (+t[2]);
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} else {
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seconds = (+t[0]) * 60 + (+t[1]);
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}
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if (isNaN(seconds)) {
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console.log('input is NaN');
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return 1;
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}
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console.log('time set to '+seconds+' seconds');
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return 0;
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}
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function setPageTime(){
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var h = Math.floor(seconds / 3600);
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var m = Math.floor((seconds % 3600) / 60);
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var s = seconds % 60;
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var strtime = h+' : '+m+' : '+s;
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console.log(strtime);
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input.value = strtime;
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}
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function startCounter(){
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console.log('counting down');
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interval = window.setInterval(countdown, 1000);
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}
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function stopCounter(){
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clearInterval(interval);
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}
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function countdown(){
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seconds = seconds - 1;
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setPageTime();
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if (seconds == 0) {
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stopCounter();
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console.log('timer at 0');
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}
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}
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</script>
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</body>
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</html>
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