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West Midlands | ITP-May-2026 | Alina Sofragiu | Sprint 3 | alarm clock #1267

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West Midlands | ITP-May-2026 | Alina Sofragiu | Sprint 3 | alarm clock #1267

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35d8c2f
alarm clock
sofragiualina Jul 19, 2026
bbfc1b8
Validate alarm input for positive integers
sofragiualina Jul 27, 2026
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51 changes: 50 additions & 1 deletion Sprint-3/alarmclock/alarmclock.js
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Original file line number Diff line number Diff line change
@@ -1,4 +1,53 @@
function setAlarm() {}
let timer = null;

function updateHeading(secondsRemaining) {
const minutes = Math.floor(secondsRemaining / 60);
const seconds = secondsRemaining % 60;

const formattedMinutes = String(minutes).padStart(2, "0");
const formattedSeconds = String(seconds).padStart(2, "0");

document.getElementById("timeRemaining").innerText =
`Time Remaining: ${formattedMinutes}:${formattedSeconds}`;
}

function setAlarm() {

@LonMcGregor LonMcGregor Jul 27, 2026

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Have you done appropriate input validation on the input time?

@sofragiualina sofragiualina Jul 27, 2026

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I didn’t add input validation before but I’ve now updated it to validate the input before starting the timer it only allows valid positive numbers

if (timer) {
clearInterval(timer);
}

const input = document.getElementById("alarmSet").value;
let secondsRemaining = Number(input);

if (!Number.isInteger(secondsRemaining) || secondsRemaining <= 0) {
alert("Please enter a valid positive number of seconds.");
return;
}


updateHeading(secondsRemaining);

timer = setInterval(() => {
secondsRemaining--;

if (secondsRemaining >= 0) {
updateHeading(secondsRemaining);
}

if (secondsRemaining === 0) {
playAlarm();
clearInterval(timer);

// Optional extra task - flash the background
let flash = false;

setInterval(() => {
document.body.style.backgroundColor = flash ? "white" : "red";
flash = !flash;
}, 500);
}
}, 1000);
}

// DO NOT EDIT BELOW HERE

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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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