silentcountdowntimer/timer.html at master · johanmattssonm/silentcountdowntimer · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
	<meta http-equiv="content-type" content="text/html; charset=UTF-8">
	<meta charset="utf-8">
	<title>Silent Countdown Timer</title>

	<!--
		This code is licensed under CC0 “No Rights Reserved”. It was written by Johan Mattsson.
		The picture was taken by Andy Bear Grills Barker: https://www.pexels.com/@andy-bear-grills-barker-565823 (the picture is also free to use).
	-->

	<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1">
	<link rel="icon" type="image/png" href="images/timerfavicon2.png" id="favicon">

	<script>
		let counter = 10;
		let state = "stopped";

		window.onload = function() {
			let time = localStorage.getItem('totalTime');

			if (time != null) {
				document.getElementById("totalTime").value = time;
			}

			updateTotalCounter();
		}

		document.addEventListener('DOMContentLoaded', function() {
			if (!Notification) {
				return;
			}

			if (Notification.permission !== 'granted') {
				Notification.requestPermission();
			}
		});

		function updateTotalCounter() {
			let time = document.getElementById("totalTime").value;
			counter = parseInt(time * 60);
			localStorage.setItem('totalTime', time);
			updateCounter();
		}

		function showTimeoutNotification() {
			let message = document.getElementById("message").value;

			if (Notification.permission !== 'granted') {
				Notification.requestPermission().then(function (permission) {
					if (permission === "granted") {
						new Notification(message, { body: message });
					}
				});
			} else {
				let message = document.getElementById("message").value;
				new Notification(message, { body: message });
			}
		}

		function updateFavicon() {
			var favicon = document.querySelector("#favicon");

			if (counter < 0) {
				if (counter % 2) {
					favicon.href = "images/timerfavicon1.png";
				} else {
					favicon.href = "images/timerfavicon2.png";
				}
			} else {
				favicon.href = "images/timerfavicon1.png";
			}
		}

		function updateCounter() {
			const seconds_per_hour = 60 * 60;
			const seconds_per_minute = 60;

			let negative = counter < 0;
			let currentCounter = negative ? -counter : counter;

			let hours = parseInt(currentCounter / seconds_per_hour);
			let minutes = parseInt((currentCounter % seconds_per_hour) / seconds_per_minute);
			let seconds = parseInt((currentCounter - seconds_per_hour * hours - minutes * seconds_per_minute) % seconds_per_minute);

			if (hours > 0 && hours < 10) {
				hours = "0" + hours;
			}

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

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

			let sign = negative ? "-" : "";
			let fullTime = sign;

			if (hours > 0) {
				fullTime += hours + ":";
			}

			fullTime += minutes + ":" + seconds;

			document.getElementById("countdown").innerHTML = fullTime;

			updateFavicon();
		}

		function iteration() {
			if (state == "stopped" || state == "paused") {
				return;
			}

			counter--;
			updateCounter();

			if (counter == 0) {
				showTimeoutNotification();
			}
		}

		function run() {
			if (state == "running") {
				document.getElementById("startButton").innerHTML = "Continue";
				pause();
				return;
			}

			if (typeof timer != "undefined") {
				clearInterval(timer);
			}

			if (state != "paused") {
				counter = parseInt(document.getElementById("totalTime").value * 60);
			}

			state = "running"
			document.getElementById("startButton").innerHTML = "Pause";
			timer = setInterval(iteration, 1000);
			updateCounter();
		}

		function pause() {
			state = "paused"
		}

		function resume() {
			state = "running"
		}

		function reset() {
			pause();
			document.getElementById("startButton").innerHTML = "Start";
			counter = parseInt(document.getElementById("totalTime").value * 60);
			updateCounter();
		}
	</script>

	<style>
		body {
			font-family: sans-serif;
			background: url(images/robin-bg.jpg) no-repeat center center fixed;
			background-size: cover;
			background-color: #000;
			padding-left: 20px;
		}

		button {
			margin-right: 10px;
			color: #fff;
			background-color: #000;
			border: none;
			width: 100px;
			padding: 10px 10px 10px 10px;
		}

		input {
			padding-left: 5px;
		}

		#countdown {
			font-size: 52px;
			color: #fff;
		}

		.settings {
			color: #fff;
			width: 350px;
		}
	</style>
</head>

<body>
	<div id="countdown" style="font-size: 72pt">30:00</div>

	<div class="settings">
		Time: <input type="number" id="totalTime" value="30" style="width: 50px;" oninput="updateTotalCounter()"> minutes<br><br>
		Message: <input type="text" id="message" value="Time is up."><br><br>
		<button onclick="run()" id="startButton">Start</button>
		<button onclick="reset()">Reset</button><br>

		<p>This is a silent countdown timer. It will display a notification when the time is up but it will not annoy your coworkers by making a sound.</p>
	</div>

</body>
</html>