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Sheffield | ITP-Jan-26 | Mahammad Osman | Sprint 3 | Alarm Clock #1162

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Sheffield | ITP-Jan-26 | Mahammad Osman | Sprint 3 | Alarm Clock #1162

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e226033
Update the title name in `index.html` to Alarm Clock App
Darkidd77 Mar 28, 2026
21079b1
Implement alarm functionality with timer and screen flashing effects
Darkidd77 Apr 2, 2026
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71 changes: 70 additions & 1 deletion Sprint-3/alarmclock/alarmclock.js
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Original file line number Diff line number Diff line change
@@ -1,4 +1,71 @@
function setAlarm() {}
let timerInterval;
let flashInterval;

function setAlarm() {
const inputElement = document.getElementById("alarmSet");
const headingElement = document.getElementById("timeRemaining");

if (!inputElement.value) {
return;
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@Luro91 Luro91 Apr 4, 2026

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It's important to validate user input.

What happens if a user enters a negative value?
How could you give feedback to the user about the input not being valid?

}

if (timerInterval) {
clearInterval(timerInterval);
}
if (flashInterval) {
clearInterval(flashInterval);
}

let timeInSeconds = Number(inputElement.value);

function updateScreen(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");

headingElement.innerText = `Time Remaining: ${formattedMinutes}:${formattedSeconds}`;
}

// update when we click set alarm
updateScreen(timeInSeconds);

timerInterval = setInterval(() => {
// Subtract 1 from the time
timeInSeconds = timeInSeconds - 1;

// Update the screen with the new time
updateScreen(timeInSeconds);

// when we hit zero?
if (timeInSeconds <= 0) {
clearInterval(timerInterval);
playAlarm();
flashScreen();
}
}, 1000);
}

function flashScreen() {
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@Luro91 Luro91 Apr 4, 2026

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Nice bonus implementation of the flashing screen

let flashCount = 0;

flashInterval = setInterval(() => {
flashCount++;

if (document.body.style.backgroundColor === "red") {
document.body.style.backgroundColor = "white";
} else {
document.body.style.backgroundColor = "red";
}

if (flashCount >= 20) {
clearInterval(flashInterval);
document.body.style.backgroundColor = "white";
}
}, 500);
}

// DO NOT EDIT BELOW HERE

Expand All @@ -20,6 +87,8 @@ function playAlarm() {

function pauseAlarm() {
audio.pause();
clearInterval(flashInterval);
document.body.style.backgroundColor = "white";
}

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">
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6 changes: 5 additions & 1 deletion Sprint-3/alarmclock/package.json
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Original file line number Diff line number Diff line change
Expand Up @@ -13,5 +13,9 @@
"bugs": {
"url": "https://github.com/CodeYourFuture/CYF-Coursework-Template/issues"
},
"homepage": "https://github.com/CodeYourFuture/CYF-Coursework-Template#readme"
"homepage": "https://github.com/CodeYourFuture/CYF-Coursework-Template#readme",
"devDependencies": {
"@testing-library/jest-dom": "^6.9.1",
"jest-environment-jsdom": "^30.3.0"
}
}
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