simple-timer/index.html at main · KiMidori3/simple-timer · GitHub

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<!DOCTYPE html>
<html lang="ja">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link rel="stylesheet" href="style.css">
    <title>シンプルなタイマー</title>
    <style>
        body {
            font-family: sans-serif;
            text-align: center;
        }
        #timer {
            font-size: 2em;
            margin-bottom: 20px;
        }
        input[type="number"] {
            width: 60px;
        }
        button {
            padding: 10px 20px;
            margin: 10px;
            cursor: pointer;
        }
    </style>
</head>
<body>
    <h1>シンプルなタイマー</h1>
    <div id="timer">25:00</div>

    <div>
        <label for="studyTime">Study Time (分):</label>
        <input type="number" id="studyTime" value="25" min="1">
    </div>
    <div>
        <label for="breakTime">Short Break (分):</label>
        <input type="number" id="breakTime" value="5" min="1">
    </div>

    <button id="startButton">スタート</button>
    <button id="stopButton" disabled>ストップ</button>

    <script>
        // JavaScript コードはこの下に書きます
        let timerDisplay = document.getElementById("timer");
        let studyTimeInput = document.getElementById("studyTime");
        let breakTimeInput = document.getElementById("breakTime");
        let startButton = document.getElementById("startButton");
        let stopButton = document.getElementById("stopButton");

        let timerInterval;
        let remainingTime;
        let isStudyTime = true;

        function updateDisplay() {
            const minutes = Math.floor(remainingTime / 60);
            const seconds = remainingTime % 60;
            timerDisplay.textContent = `${String(minutes).padStart(2, '0')}:${String(seconds).padStart(2, '0')}`;
        }

        function startTimer() {
            const studyMinutes = parseInt(studyTimeInput.value);
            const breakMinutes = parseInt(breakTimeInput.value);

            remainingTime = isStudyTime ? studyMinutes * 60 : breakMinutes * 60;
            updateDisplay();

            startButton.disabled = true;
            stopButton.disabled = false;

            timerInterval = setInterval(() => {
                remainingTime--;
                updateDisplay();

                if (remainingTime <= 0) {
                    clearInterval(timerInterval);
                    if (isStudyTime) {
                        alert("Study Time 終了！休憩に入ります。");
                        isStudyTime = false;
                    } else {
                        alert("休憩終了！Study Time に戻ります。");
                        isStudyTime = true;
                    }
                    startTimer(); // 次のタイマーを開始
                }
            }, 1000); // 1000ミリ秒 (1秒) ごとに処理を実行
        }

        function stopTimer() {
            clearInterval(timerInterval);
            startButton.disabled = false;
            stopButton.disabled = true;
        }

        startButton.addEventListener("click", startTimer);
        stopButton.addEventListener("click", stopTimer);

        // ページ読み込み時に初期表示
        const initialStudyMinutes = parseInt(studyTimeInput.value);
        remainingTime = initialStudyMinutes * 60;
        updateDisplay();
    </script>
</body>
</html>