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London | 26-ITP-May | Yonatan Teklemariam | Sprint 3 | Alarm Clock #1403

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London | 26-ITP-May | Yonatan Teklemariam | Sprint 3 | Alarm Clock #1403

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28a696f
reverted to original
Yonatanteklemariam Jul 7, 2026
cff19af
reverted to original
Yonatanteklemariam Jul 7, 2026
9e95480
implemented the alarmclock function and added some flashing effect on it
Yonatanteklemariam Aug 7, 2026
ebfc715
Merge branch 'main' into Sprint-3-alarmclock
Yonatanteklemariam Aug 7, 2026
8e5af85
Remove unnecessary whitespace in index.html
Yonatanteklemariam Aug 7, 2026
eb2df34
cleaned and restructured the script.js file, replace the flashing eff…
Yonatanteklemariam Aug 13, 2026
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105 changes: 104 additions & 1 deletion Sprint-3/alarmclock/alarmclock.js
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Original file line number Diff line number Diff line change
@@ -1,4 +1,106 @@
function setAlarm() {}
// This is the countdown number that will go down every second
let countdownTimer;

function startFlashing() {
document.body.classList.add("flash-background");
}

function stopFlashing() {
document.body.classList.remove("flash-background");
}
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cjyuan marked this conversation as resolved.

function setAlarm() {
const rawInput = document.getElementById("alarmSet").value.trim();

// Reject empty input
if (rawInput === "") {
alert("Please enter a time.");
return;
}

// 2. Parse input → returns either a number of seconds or null
const totalSeconds = parseInput(rawInput);

// 3. Reject invalid parsed values
if (totalSeconds === null || totalSeconds <= 0) {
alert("Please enter a valid positive time.");
return;
}

// 4. Reject extremely large values
if (totalSeconds > 36000) {
alert("Please enter a time less than 10 hours.");
return;
}

stopFlashing();
pauseAlarm();

// 5. If we reach here → input is valid
startCountdown(totalSeconds);
}

function parseInput(rawInput) {
if (rawInput.includes(":")) {
const [minsStr, secsStr] = rawInput.split(":");

const mins = Number(minsStr);
const secs = Number(secsStr);

if (
Number.isNaN(mins) ||
Number.isNaN(secs) ||
Comment on lines +47 to +52

@cjyuan cjyuan Aug 13, 2026

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What type of numbers should they be? What if the user enter 1.1:2.2 or 1.2345?

mins < 0 ||
secs < 0 ||
secs >= 60
) {
return null;
}

return mins * 60 + secs;
}

const secs = Number(rawInput);
return Number.isNaN(secs) ? null : secs;
}

function startCountdown(totalSeconds) {
let timeLeft = totalSeconds;

if (countdownTimer) {
clearInterval(countdownTimer);
}

updateDisplay(timeLeft);

countdownTimer = setInterval(() => {
timeLeft--;
updateDisplay(timeLeft);

if (timeLeft <= 0) {
clearInterval(countdownTimer);
playAlarm();
startFlashing();
}
}, 1000);
}

// A simple helper to turn seconds into MM:SS format
function formatTime(seconds) {
const mins = Math.floor(seconds / 60);
const secs = seconds % 60;

// Make sure both numbers always have two digits
const paddedMins = String(mins).padStart(2, "0");
const paddedSecs = String(secs).padStart(2, "0");

return `${paddedMins}:${paddedSecs}`;
}

function updateDisplay(seconds) {
document.getElementById("timeRemaining").innerText =
`Time Remaining: ${formatTime(seconds)}`;
}

// DO NOT EDIT BELOW HERE

Expand All @@ -11,6 +113,7 @@ function setup() {

document.getElementById("stop").addEventListener("click", () => {
pauseAlarm();
stopFlashing(); // stop flashing if running

@cjyuan cjyuan Aug 13, 2026

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An alternative would be to add another event listener that performs only `stop flashing".

});
}

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36 changes: 19 additions & 17 deletions Sprint-3/alarmclock/index.html
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Original file line number Diff line number Diff line change
@@ -1,20 +1,22 @@
<!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>
</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" />

<button id="set" type="button">Set Alarm</button>
<button id="stop" type="button">Stop Alarm</button>
</div>
<script src="alarmclock.js"></script>
</body>
</html>
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<link rel="stylesheet" href="style.css" />
<title>Alarm Clock</title>

<body>
<div class="centre">
<h1 id="timeRemaining">Time Remaining: 00:00</h1>
<label for="alarmSet">Set time to:</label>
<input id="alarmSet" type="number" />

<button id="set" type="button">Set Alarm</button>
<button id="stop" type="button">Stop Alarm</button>
</div>
<script src="alarmclock.js"></script>
</body>

</html>
24 changes: 24 additions & 0 deletions Sprint-3/alarmclock/style.css
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Original file line number Diff line number Diff line change
Expand Up @@ -13,3 +13,27 @@
h1 {
text-align: center;
}

/* flashing effect for the alarm app */
@keyframes colorRipple {
0% {
background-color: #ffffff;
} /* White */
25% {
background-color: #ff6b6b;
} /* Light Coral / Soft Red */
50% {
background-color: #feca57;
} /* Mango / Warm Yellow-Orange */
75% {
background-color: #48dbfb;
} /* Sky Blue / Light Aqua */
100% {
background-color: #ffffff;
} /* White */
}

/* apply the flashing effect to the body when the alarm is triggered */
.flash-background {
animation: colorRipple 0.8s infinite;
}
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