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Sheffield | 26-ITP-Jan | Mahmoud Shaabo | Sprint 3 | Alarm Clock App #1155

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Sheffield | 26-ITP-Jan | Mahmoud Shaabo | Sprint 3 | Alarm Clock App #1155

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57ab58c
feat: implement alarm clock functionality
mahmoudshaabo1984 Mar 31, 2026
04f8254
fix: address PR review feedback and implement DRY principle
mahmoudshaabo1984 Apr 5, 2026
3da5c59
refactor: apply CJ's final feedback for feedback element and classLis…
mahmoudshaabo1984 Apr 7, 2026
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50 changes: 49 additions & 1 deletion Sprint-3/alarmclock/alarmclock.js
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Original file line number Diff line number Diff line change
@@ -1,4 +1,52 @@
function setAlarm() {}
// Stores the interval ID so we can clear it later
let interval = null;

function setAlarm() {
// Clear any previously running countdown
clearInterval(interval);

// Reset background to default
document.body.style.backgroundColor = "";

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// Read the input value and convert it to a plain integer (total seconds)
let totalSeconds = parseInt(document.getElementById("alarmSet").value);
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// --- Format and display the initial time ---
// Math.floor(119 / 60) = 1 --> minutes
// 119 % 60 = 59 --> leftover seconds
// padStart(2, "0") ensures single digits become "01", "09", etc.
const mins = String(Math.floor(totalSeconds / 60)).padStart(2, "0");
const secs = String(totalSeconds % 60).padStart(2, "0");
document.getElementById("timeRemaining").innerText =
"Time Remaining: " + mins + ":" + secs;
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@cjyuan cjyuan Apr 5, 2026 •
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Instead of keeping several copies of the code for displaying time (lines 18-21, lines 44-47, lines 32-33),
it is better to define a function to update the time display and call the function to update the time display.

Advantages:

  • Keep the logic for updating time display in one place
  • Less code


// --- Start the countdown ---
// setInterval calls the callback every 1000 ms (1 second) and returns an ID
interval = setInterval(function () {
totalSeconds--; // subtract 1 second

if (totalSeconds <= 0) {
// Stop the interval when time runs out
clearInterval(interval);

document.getElementById("timeRemaining").innerText =
"Time Remaining: 00:00";

// Change background color to signal the alarm
document.body.style.backgroundColor = "red";
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@cjyuan cjyuan Apr 6, 2026

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To better separate presentation logic from application logic, you can consider defining a CSS class, and use classList.toggle() to apply/remove the style. For example,

document.body.classList.toggle("alarm-activated", true);  // apply style
document.body.classList.toggle("alarm-activated", false); // remove style


// Trigger the alarm sound (defined below the DO NOT EDIT line)
playAlarm();
return;
}

// Recalculate mm:ss for the new totalSeconds and update the display
const m = String(Math.floor(totalSeconds / 60)).padStart(2, "0");
const s = String(totalSeconds % 60).padStart(2, "0");
document.getElementById("timeRemaining").innerText =
"Time Remaining: " + m + ":" + s;
}, 1000);
}

// DO NOT EDIT BELOW HERE

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2 changes: 1 addition & 1 deletion Sprint-3/alarmclock/index.html
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Original file line number Diff line number Diff line change
Expand Up @@ -4,7 +4,7 @@
<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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