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London | 26-ITP-Jan | Alex Okorefe | Sprint 3 | Alarm clock #1179

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London | 26-ITP-Jan | Alex Okorefe | Sprint 3 | Alarm clock #1179

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f55cbf8
Changed the title to Alarm Clock App
Alex-Os-Dev-Lab Mar 14, 2026
333486d
Revert title to default in index.html
Alex-Os-Dev-Lab Mar 14, 2026
1d5456c
Implement alarm functionality with countdown and validation
Alex-Os-Dev-Lab Mar 14, 2026
457ae35
Refactor updateTimeDisplay function for clarity and consistency
Alex-Os-Dev-Lab Mar 16, 2026
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46 changes: 45 additions & 1 deletion Sprint-3/alarmclock/alarmclock.js
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Original file line number Diff line number Diff line change
@@ -1,4 +1,48 @@
function setAlarm() {}
timerInterval = null;
function setAlarm() {
// 1. Get the input from the user
const inputField = document.getElementById("alarmSet");
let timeRemaining = parseInt(inputField.value);

// 2. Validate: If no number or 0 is entered, do nothing
if (isNaN(timeRemaining) || timeRemaining <= 0) {
return;
}

// 3. Clear any existing timer; prevent multiple alarms running at once
clearInterval(timerInterval);

// 4. Update the display immediately
updateTimeDisplay(timeRemaining);

// 5. Start the countdown
timerInterval = setInterval(() => {
timeRemaining -= 1;

updateTimeDisplay(timeRemaining);

// 6. Check if timer hit zero
if (timeRemaining <= 0) {
clearInterval(timerInterval);
playAlarm();
document.body.style.backgroundColor = "red";
}
}, 1000);
}

// mm:ss formatting
function updateTimeDisplay(totalSeconds) {
const minutes = Math.floor(totalSeconds / 60);
const seconds = totalSeconds % 60;

//00:00 format
const formattedMinutes = minutes.toString().padStart(2, "0");
const formattedSeconds = seconds.toString().padStart(2, "0");

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

// 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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