javascript/timer.html at main · Gokulsiva-web/javascript · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Countdown Timer</title>
    <style>
        body {
            display: flex;
            justify-content: center;
            align-items: center;
            height: 100vh;
            font-family: Arial, sans-serif;
            background-color: #f0f0f0;
        }
        #timerDisplay {
            font-size: 2em;
            margin-bottom: 10px;
        }
        input, button {
            padding: 10px;
            margin: 5px;
            font-size: 1em;
        }
    </style>
</head>
<body>
    <div>
        <div id="timerDisplay">00:00</div>
        <input type="number" id="secondsInput" placeholder="Enter seconds">
        <button onclick="startTimer()">Start Timer</button>
    </div>

    <script>
        let countdown;
        function startTimer() {
            let seconds = parseInt(document.getElementById("secondsInput").value);
            if (isNaN(seconds) || seconds <= 0) {
                alert("Please enter a valid number of seconds.");
                return;
            }

            clearInterval(countdown);
            const timerDisplay = document.getElementById("timerDisplay");
            timerDisplay.textContent = formatTime(seconds);

            countdown = setInterval(() => {
                seconds--;
                timerDisplay.textContent = formatTime(seconds);

                if (seconds <= 0) {
                    clearInterval(countdown);
                    alert("Time's up!");
                }
            }, 1000);
        }

        function formatTime(seconds) {
            let minutes = Math.floor(seconds / 60);
            let remainingSeconds = seconds % 60;
            return `${String(minutes).padStart(2, '0')}:${String(remainingSeconds).padStart(2, '0')}`;
        }
    </script>
</body>
</html>