</head>
<body>
<form method="post" action="#">
<label for="bedrag">Bedrag per product</label>
<input type="text" name="bedrag" required><br>
<label for='aantal'>Aantal producten</label>
<input type="number" name="aantal" required>
<label>BTW</label><br>
<select name="country" required="required" size="5">
<option value="NL" selected>NL</option>
<option value="UK">UK</option>
<option value="DE">DE</option>
<option value="FR">FR</option>
<option value="HON">HON</option>
</select>
<input type="reset" value="leeghalen">
<input type="submit" value="sturen">
</form>
<?php
require 'calculator/ICalculator.php';
require 'calculator/Calculator.php';
if (isset($_POST['country']) && isset($_POST['bedrag']) && isset($_POST['aantal'])) {
if (is_numeric($_POST['bedrag']) && is_numeric($_POST['aantal'])) {
$calculator = new Calculator($_POST['country']);
echo $calculator->calculateBtw($_POST['bedrag'] * $_POST['aantal']);
}
}
?>
</body>
</html>