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index.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, user-scalable=no, initial-scale=0.7">
<title>BeerRisk Calculator</title>
<link href="css/bootstrap.min.css" rel="stylesheet">
<link href="css/main.css" rel="stylesheet">
</head>
<body>
<div class="navbar navbar-custom" role="navigation">
<div class="container">
<div class="navbar-header">
<button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-collapse">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a class="navbar-brand" href="#">BeerRisk</a>
</div>
<div class="collapse navbar-collapse">
<ul class="nav navbar-nav">
<li class="active"><a href="#">Home</a></li>
<li><a href="mailto:ahf@0x90.dk">Contact</a></li>
</ul>
</div>
</div>
</div>
<div class="container">
<form class="form-horizontal calculate-form" role="calculate">
<label for="input_amount">Beverage size in centiliters</label>
<div class="input-group">
<input id="input_amount" type="text" class="form-control" required autofocus>
<span class="input-group-addon">cl</span>
</div>
<label for="input_percentage">Alcohol percentage</label>
<div class="input-group">
<input id="input_percentage" type="number" step="any" min="0" max="100" class="form-control" required>
<span class="input-group-addon">%</span>
</div>
<div class="form-group">
<button type="button" class="btn btn-lg btn-primary calculate-button center-block" onclick="doCalculation()">
Calculate
</button>
</div>
</form>
<h2 id="result" class="text-center"></h2>
</div>
<script src="js/jquery.min.js"></script>
<script src="js/bootstrap.min.js"></script>
<script src="js/core-min.js"></script>
<script>
function calculate(amount, percentage) {
return (amount * percentage) / 150;
}
function doCalculation() {
var amount = $("#input_amount").val();
var percentage = $("#input_percentage").val();
if (! amount || ! percentage) {
return;
}
var result = calculate(parseFloat(amount), parseFloat(percentage));
$("#result").text(result.toFixed(2));
}
$(document).ready(function() {
$('input[type=text], input[type=number]').on('change keyup paste', function(e) {
doCalculation();
})
});
</script>
</body>
</html>