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London | 26-ITP-Jan | Raihan Sharif | Sprint 3 | Alarm Clock #964

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London | 26-ITP-Jan | Raihan Sharif | Sprint 3 | Alarm Clock #964

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62 changes: 61 additions & 1 deletion Sprint-3/alarmclock/alarmclock.js
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Original file line number Diff line number Diff line change
@@ -1,4 +1,64 @@
function setAlarm() {}
// need to set interval outside of setAlarm() so that every time the user clicks set alarm
// the previous interval is deleted. Otherwise there will be overlapping intervals
// if a user clicks on set alarm while an countdown is already active.
let intervalId = null;

function setAlarm() {
const alarmClockInput = document.getElementById("alarmSet");
const clockDisplay = document.getElementById("timeRemaining");
let secondsRemaining = parseInt(alarmClockInput.value, 10);

if (!isValidInput(secondsRemaining)) {
alert("please enter a valid positive integer!");
return;
}

clearInterval(intervalId);

// display immediately on click;
const minutes = Math.floor(secondsRemaining / 60);
const seconds = secondsRemaining % 60;
displayTime(minutes, seconds, clockDisplay);

intervalId = setInterval(() => {
secondsRemaining--;

if (secondsRemaining <= 0) {
clearInterval(intervalId);
displayTime(0, 0, clockDisplay);
playAlarm();
return;
}

const minutes = Math.floor(secondsRemaining / 60);
const seconds = secondsRemaining % 60;
displayTime(minutes, seconds, clockDisplay);
}, 1000);
}

// formats and displays countdown time to a supplied element
function displayTime(mins, secs, elem) {
const minsFormatted = String(mins).padStart(2, "0");
const secsFormatted = String(secs).padStart(2, "0");
elem.textContent = `Time Remaining: ${minsFormatted}:${secsFormatted}`;
}

// returns true if input is an integer, false otherwise
function isValidInput(input) {
if (input === "" || isNaN(input)) {
return false;
}

if (!Number.isInteger(input)) {
return false;
}

if (input < 0) {
return false;
}

return true;
}

// DO NOT EDIT BELOW HERE

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6 changes: 3 additions & 3 deletions Sprint-3/alarmclock/index.html
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Original file line number Diff line number Diff line change
@@ -1,16 +1,16 @@
<!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">
<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" step="1" required />

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