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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;
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@magarpratik magarpratik Apr 8, 2026

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To align with best practices, could we use a keyword here when initialising the variable?

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);
}
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@magarpratik magarpratik Apr 8, 2026

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Could you also reset the background colour when "Set Alarm" is clicked again after the timer is up? Right now it stays red, and resetting it would make the UI clearer for the next countdown.


// 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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