โปรแกรมนาฬิกาถอยหลัง bootstrap html css กรอกเวลาเองได้
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Countdown Timer</title>
<!-- Bootstrap CSS -->
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.5.2/css/bootstrap.min.css">
<style>
/* Optional: Add custom styles here */
</style>
</head>
<body>
<div class="container mt-5">
<div class="row justify-content-center">
<div class="col-md-6">
<div class="form-group">
<label for="countdown-input">Enter time to countdown (in seconds):</label>
<input type="number" id="countdown-input" class="form-control">
</div>
<button id="start-countdown" class="btn btn-primary">Start Countdown</button>
<div id="countdown-display" class="mt-3"></div>
</div>
</div>
</div>
<!-- Bootstrap JS and jQuery (required for Bootstrap) -->
<script src="https://code.jquery.com/jquery-3.5.1.slim.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/@popperjs/core@2.5.4/dist/umd/popper.min.js"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.5.2/js/bootstrap.min.js"></script>
<script>
$(document).ready(function() {
$('#start-countdown').click(function() {
var countdownSeconds = parseInt($('#countdown-input').val());
if (!isNaN(countdownSeconds) && countdownSeconds > 0) {
startCountdown(countdownSeconds);
} else {
alert('Please enter a valid number of seconds greater than 0.');
}
});
});
function startCountdown(seconds) {
var countdownDisplay = document.getElementById('countdown-display');
var timer = seconds;
var countdownInterval = setInterval(function() {
if (timer <= 0) {
clearInterval(countdownInterval);
countdownDisplay.innerHTML = 'Countdown Complete!';
} else {
countdownDisplay.innerHTML = 'Time remaining: ' + timer + ' seconds';
timer--;
}
}, 1000);
}
</script>
</body>
</html>
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