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London | 26-ITP-JAN | Asha Ahmed | Sprint 3 | Alarm clock #1009

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London | 26-ITP-JAN | Asha Ahmed | Sprint 3 | Alarm clock #1009

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c94e7bb
Implement alarm countdown functionality and update page title
ashaahmed7 Mar 14, 2026
262c6c7
Refactor setAlarm function for improved readability and maintainability
ashaahmed7 Mar 14, 2026
827887c
Changed title element to 'Alarm clock app'
ashaahmed7 Mar 28, 2026
036886f
Made changes to comments
ashaahmed7 Mar 28, 2026
584bd1d
Fixed all inconsistencies, alarm clock works
ashaahmed7 Apr 11, 2026
c7d5f7d
Add alarm flashing effect and improve alarm handling logic
ashaahmed7 Apr 18, 2026
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71 changes: 67 additions & 4 deletions Sprint-3/alarmclock/alarmclock.js
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Original file line number Diff line number Diff line change
@@ -1,14 +1,70 @@
function setAlarm() {}

// DO NOT EDIT BELOW HERE
let countdownInterval = null;
let secondsLeft = 0;
const heading = document.getElementById("timeRemaining");

// Move audio to outer scope so stopAndResetAlarm can reach it
var audio = new Audio("alarmsound.mp3");

function stopAndResetAlarm() {
audio.pause();
audio.currentTime = 0;
}

function setAlarm() {
// Stop any currently ringing alarm before starting a new one
stopAndResetAlarm();
stopFlashing(); // reset background too

const input = document.getElementById("alarmSet");
const seconds = parseInt(input.value, 10);
if (isNaN(seconds) || seconds <= 0) {
return;
}

secondsLeft = seconds;

if (countdownInterval !== null) {
clearInterval(countdownInterval);
countdownInterval = null;
}

updateTimeDisplay();

countdownInterval = setInterval(() => {
secondsLeft = secondsLeft - 1;
updateTimeDisplay();
if (secondsLeft <= 0) {
clearInterval(countdownInterval);
countdownInterval = null;
secondsLeft = 0;
updateTimeDisplay();
playAlarm();
startFlashing(); // flash when alarm fires
}
}, 1000);
}
Comment on lines +36 to +45
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@hkavalikas hkavalikas Mar 22, 2026

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Can you walk me through what will happen on every "tick" from 2 seconds down to 0? Is there something in this statement we can remove that might be redundant?

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@ashaahmed7 ashaahmed7 Mar 28, 2026

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From 2 → 1 nothing happens in this block, and when it reaches 0 the condition becomes true and the interval is cleared, display updated, and alarm played. The assignment secondsLeft = 0 is redundant here because the value is already 0 when the condition is met (assuming it doesn’t go negative), so it can be removed.


function updateTimeDisplay() {
const minutes = Math.floor(secondsLeft / 60);
const seconds = secondsLeft % 60;
const displayMin = minutes.toString().padStart(2, "0");
const displaySec = seconds.toString().padStart(2, "0");
heading.textContent = `Time Remaining: ${displayMin}:${displaySec}`;
}

function startFlashing() {
document.body.classList.add("flashing");
}

function stopFlashing() {
document.body.classList.remove("flashing");
}

// DO NOT EDIT BELOW HERE
function setup() {
document.getElementById("set").addEventListener("click", () => {
setAlarm();
});

document.getElementById("stop").addEventListener("click", () => {
pauseAlarm();
});
Expand All @@ -20,6 +76,13 @@ function playAlarm() {

function pauseAlarm() {
audio.pause();
stopFlashing(); // reset background

// Also pause the countdown
if (countdownInterval !== null) {
clearInterval(countdownInterval);
countdownInterval = null;
}
}

window.onload = setup;
4 changes: 2 additions & 2 deletions Sprint-3/alarmclock/index.html
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Original file line number Diff line number Diff line change
@@ -1,10 +1,10 @@
<!DOCTYPE html>
<!doctype html>
<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 app</title>
</head>
<body>
<div class="centre">
Expand Down
14 changes: 14 additions & 0 deletions Sprint-3/alarmclock/style.css
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Original file line number Diff line number Diff line change
Expand Up @@ -13,3 +13,17 @@
h1 {
text-align: center;
}

@keyframes flash {
0%,
100% {
background-color: white;
}
50% {
background-color: red;
}
}

body.flashing {
animation: flash 0.6s infinite;
}
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