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London | 26-ITP-Jan | Kris Oldrini | Sprint 3 | Alarm Clock App #1208

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London | 26-ITP-Jan | Kris Oldrini | Sprint 3 | Alarm Clock App #1208

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f67e8d2
coursework: create setAlarm function to change the timeRemaining elem…
XiaoQuark Apr 20, 2026
9fcfad2
set interval based on time input before calling playAlarm
XiaoQuark Apr 20, 2026
ad4a3a6
refactor: delay playAlarm with setTimeout and use setInterval to chan…
XiaoQuark Apr 20, 2026
5932f54
refactor setInterval and remove setTimeout. Inplement clearInterval b…
XiaoQuark Apr 20, 2026
c4c9260
implement change of background colour when alarm plays
XiaoQuark Apr 20, 2026
7a7eb43
refactor: remove unused variables and fix playAlarm timing
XiaoQuark Apr 20, 2026
0f87e64
fix: validate input numbers to be positive integers only and stop tim…
XiaoQuark Apr 20, 2026
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45 changes: 44 additions & 1 deletion Sprint-3/alarmclock/alarmclock.js
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Original file line number Diff line number Diff line change
@@ -1,4 +1,46 @@
function setAlarm() {}
const state = {
remainingTime: 0,
timerId: null,
};

function setAlarm() {
if (state.timerId !== null) {
clearInterval(state.timerId);
state.timerId = null;
}
const timeInput = document.getElementById("alarmSet");
state.remainingTime = +timeInput.value;
const formattedTime = formatTime(state.remainingTime);
timeInput.value = "";

const displayedTime = document.getElementById("timeRemaining");
displayedTime.textContent = `Time Remaining: ${formattedTime}`;

state.timerId = setInterval(timer, 1000);
}

function formatTime(seconds) {
const remainingSeconds = seconds % 60;
const minutes = (seconds - remainingSeconds) / 60;

const formattedSeconds = remainingSeconds.toString().padStart(2, "0");
const formattedMinutes = minutes.toString().padStart(2, "0");

return `${formattedMinutes}:${formattedSeconds}`;
}

function timer() {
const displayedTime = document.getElementById("timeRemaining");
state.remainingTime -= 1;
const countingDownTime = formatTime(state.remainingTime);
displayedTime.textContent = `Time Remaining: ${countingDownTime}`;
if (state.remainingTime === 0) {
clearInterval(state.timerId);
state.timerId = null;
document.body.style.backgroundColor = "red";
playAlarm();
}
}

// DO NOT EDIT BELOW HERE

Expand All @@ -19,6 +61,7 @@ function playAlarm() {
}

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

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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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