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Sheffield | 25-ITP-Sep | Jak Rhodes-Smith | Sprint 3 | Alarm Clock #922

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Sheffield | 25-ITP-Sep | Jak Rhodes-Smith | Sprint 3 | Alarm Clock #922

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f67ae43
feat: implement setAlarm function and update HTML
jakr-s Dec 8, 2025
435d330
feat: change background colour to red on alarm trigger and reset when…
jakr-s Dec 8, 2025
944fea3
feat: improve alarm functionality with input validation and timer reset
jakr-s Dec 11, 2025
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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() {}
let currentTimerId = null;

function setAlarm() {
const input = document.getElementById("alarmSet");
const heading = document.getElementById("timeRemaining");
let seconds = Number(input.value);

// Sanitise input
if (!Number.isInteger(seconds) || seconds <= 0) {
alert("Please enter a positive whole number");
return;
}

// Reset before starting new countdown
if (currentTimerId !== null) {
clearInterval(currentTimerId);
}

pauseAlarm();

document.body.style.backgroundColor = "";

function updateDisplay(remainingSeconds) {
const minutes = Math.floor(remainingSeconds / 60);
const secs = remainingSeconds % 60;
const formattedTime = `${String(minutes).padStart(2, "0")}:${String(secs).padStart(2, "0")}`;
heading.textContent = `Time Remaining: ${formattedTime}`;
}

// Set initial display
updateDisplay(seconds);

// Start countdown
currentTimerId = setInterval(() => {
seconds--;
updateDisplay(seconds);

if (seconds <= 0) {
clearInterval(currentTimerId);
currentTimerId = null;
playAlarm();
document.body.style.backgroundColor = "red";
}
}, 1000);
}

// DO NOT EDIT BELOW HERE

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7 changes: 4 additions & 3 deletions Sprint-3/alarmclock/index.html
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Original file line number Diff line number Diff line change
@@ -1,16 +1,17 @@
<!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>
<link rel="icon" href="" />
<title>Alarm clock app</title>
</head>
<body>
<div class="centre">
<h1 id="timeRemaining">Time Remaining: 00:00</h1>
<label for="alarmSet">Set time to:</label>
<input id="alarmSet" type="number" />
<input id="alarmSet" type="number" min="1" />

<button id="set" type="button">Set Alarm</button>
<button id="stop" type="button">Stop Alarm</button>
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