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Cape Town | 2026-ITP-Jan | Isaac Abodunrin | Sprint 3 | Grouping data: Alarm Clock #1182

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Cape Town | 2026-ITP-Jan | Isaac Abodunrin | Sprint 3 | Grouping data: Alarm Clock #1182

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104bc75
Rename app title
bytesandroses Mar 29, 2026
bc9db0d
Implement set Alarm
bytesandroses Apr 5, 2026
2e9abac
Refactor: remove duplicate setAlarm button event listener
bytesandroses Apr 5, 2026
15cd7d0
Refactor: remove duplicate stopAlarm button event listener
bytesandroses Apr 5, 2026
01299b1
Refactor: separate time display into a function
bytesandroses Apr 6, 2026
13a05e6
Refactor: improve readability
bytesandroses Apr 6, 2026
7a55810
Feat: allow alarm to countdown
bytesandroses Apr 6, 2026
d0daf34
Refactor: move timer countdown into separate function
bytesandroses Apr 6, 2026
47e2f22
Refactor alarm countdown
bytesandroses Apr 6, 2026
5fcb0b1
Fix: add 0 in front of minutes when single digit
bytesandroses Apr 6, 2026
98a0a64
Fix: prevent multiple setInterval timers running at the same time
bytesandroses Apr 6, 2026
dfa1f57
Fix: update timer value immediately after button is clicked
bytesandroses Apr 6, 2026
cb65771
Fix: ensure timer stops at 00:00 and doesn't go below
bytesandroses Apr 6, 2026
eeb1c24
Refactor: improve readability of formatTime() function
bytesandroses Apr 6, 2026
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40 changes: 38 additions & 2 deletions Sprint-3/alarmclock/alarmclock.js
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Original file line number Diff line number Diff line change
@@ -1,6 +1,42 @@
function setAlarm() {}
let timeRemaining;
let timerInterval;

// DO NOT EDIT BELOW HERE
function formatTime(time) {
const minutes = String(Math.floor(time / 60)).padStart(2, "0");
const seconds = String(time % 60).padStart(2, "0");

return `${minutes}:${seconds}`;
}

function displayAlarm(time) {
const alarmBox = document.getElementById("timeRemaining");
alarmBox.textContent = `Time Remaining: ${formatTime(time)}`;
}

function decreaseAlarmTime() {
if (timeRemaining <= 0) {
clearInterval(timerInterval);
timerInterval = null;
timeRemaining = 0;
playAlarm();
return;
}

timeRemaining--;
displayAlarm(timeRemaining);
}
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@cjyuan cjyuan Apr 9, 2026

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When the countdown reaches 00:00, there is a one second delay before the alarm sound is played. Is this by design?

At line 25, when timeRemaining changes from 1 to 0, the app only changes the display to 00:00. It's only in the next interval, the code on lines 17-22 is executed.


function setAlarm() {
const setTime = document.getElementById("alarmSet").value;
timeRemaining = parseInt(setTime, 10);
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@cjyuan cjyuan Apr 9, 2026

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Using user input without proper validation and sanitisation can be dangeours.

Currently, some unusual input values can make your app behave abnormally. Can you add code to sanitise them?


if (timerInterval) {
clearInterval(timerInterval);
}
Comment on lines +33 to +35
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@cjyuan cjyuan Apr 9, 2026 •
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The countdown interval is not the only state to be reset.

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

You can also consider introducing a dedicated reset function to return the app to a clean initial state to help ensure consistency.


displayAlarm(timeRemaining);
timerInterval = setInterval(decreaseAlarmTime, 1000);
}

var audio = new Audio("alarmsound.mp3");

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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">
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