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Sheffield | 26-ITP-Jan | Seti Mussa | Sprint 3 | Alarm Clock #1178

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Sheffield | 26-ITP-Jan | Seti Mussa | Sprint 3 | Alarm Clock #1178

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90 changes: 79 additions & 11 deletions Sprint-3/alarmclock/alarmclock.js
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Original file line number Diff line number Diff line change
@@ -1,25 +1,93 @@
function setAlarm() {}
let timeRemaining = 0;
let timerId = null;

// DO NOT EDIT BELOW HERE
const audio = new Audio("alarmsound.mp3");

var audio = new Audio("alarmsound.mp3");
// FORMAT mm:ss
function formatTime(seconds) {
const mins = Math.floor(seconds / 60);
const secs = seconds % 60;

function setup() {
document.getElementById("set").addEventListener("click", () => {
setAlarm();
});
return `${String(mins).padStart(2, "0")}:${String(secs).padStart(2, "0")}`;
}

document.getElementById("stop").addEventListener("click", () => {
pauseAlarm();
});
// UPDATE DISPLAY (MUST MATCH TEST EXACTLY)
function updateDisplay() {
const heading = document.getElementById("timeRemaining");
heading.textContent = "Time Remaining: " + formatTime(timeRemaining);
}
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@cjyuan cjyuan Apr 8, 2026

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Why not include a parameter to

  • make this function reusable (e.g. call updateDisplay(0) to reset timer display)
  • avoid using a global variable timeRemaining

?


// REQUIRED BY TESTS
function playAlarm() {
audio.loop = true;
audio.currentTime = 0;
audio.play();
}

function pauseAlarm() {
// STOP ALARM
function stopAlarm() {
audio.pause();
audio.currentTime = 0;
audio.loop = false;

clearInterval(timerId);
timerId = null;

document.body.style.backgroundColor = "";
}

// TRIGGER ALARM
function triggerAlarm() {
document.body.style.backgroundColor = "red";
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@cjyuan cjyuan Apr 8, 2026

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To better separate presentation logic from application logic, you can consider defining a CSS class, and use classList.toggle() to apply/remove the style. For example,

document.body.classList.toggle("alarm-activated", true);  // apply style
document.body.classList.toggle("alarm-activated", false); // remove style

playAlarm();
}

// START TIMER
function startTimer() {
clearInterval(timerId);
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@cjyuan cjyuan Apr 8, 2026

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Currently when starting a new countdown, the application does not always return to a clean initial state,
which can lead to inconsistent behaviour between runs.

Hint: a user may not click the "Stop" button first before starting a new count down.


timerId = setInterval(() => {
timeRemaining--;

updateDisplay();

if (timeRemaining <= 0) {
clearInterval(timerId);
timerId = null;

timeRemaining = 0;
updateDisplay();

triggerAlarm();
}
}, 1000);
}

// SET ALARM
function setAlarm() {
const input = document.getElementById("alarmSet").value;

// ensure clean number input
timeRemaining = parseInt(input, 10);

if (isNaN(timeRemaining) || timeRemaining < 0) {
timeRemaining = 0;
}

updateDisplay();

if (timeRemaining > 0) {
startTimer();
}
}

// SETUP
function setup() {
document.getElementById("set").addEventListener("click", setAlarm);
document.getElementById("stop").addEventListener("click", stopAlarm);

timeRemaining = 0;
updateDisplay();
}

window.onload = setup;
21 changes: 10 additions & 11 deletions Sprint-3/alarmclock/index.html
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Original file line number Diff line number Diff line change
Expand Up @@ -2,19 +2,18 @@
<html lang="en">
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<link rel="stylesheet" href="style.css" />
<title>Title here</title>
<title>Alarm Clock</title>
</head>

<body>
<div class="centre">
<h1 id="timeRemaining">Time Remaining: 00:00</h1>
<label for="alarmSet">Set time to:</label>
<input id="alarmSet" type="number" />
<h1>
Time Remaining: <span id="timeRemaining">00:00</span>
</h1>

<input id="alarmSet" type="number" />
<button id="set">Set Alarm</button>
<button id="stop">Stop Alarm</button>

<button id="set" type="button">Set Alarm</button>
<button id="stop" type="button">Stop Alarm</button>
</div>
<script src="alarmclock.js"></script>
</body>
</html>
</html>
16 changes: 6 additions & 10 deletions Sprint-3/alarmclock/style.css
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Original file line number Diff line number Diff line change
@@ -1,15 +1,11 @@
.centre {
position: fixed;
top: 50%;
left: 50%;
-webkit-transform: translate(-50%, -50%);
transform: translate(-50%, -50%);
}

#alarmSet {
margin: 20px;
body {
background-color: blanchedalmond;
}

h1 {
text-align: center;
}

#alarmSet {
margin: 20px;
}
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