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HTML

<!DOCTYPE html>
<html>
<head>
<title>Metric/Imperial Converter</title>
<meta name="description" content="An example of the Free Code Camp Metric/Imperial Converter Project">
<link id="favicon" rel="icon" href="https://cdn.freecodecamp.org/universal/favicons/favicon-32x32.png" type="image/x-icon">
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="./public/style.css">
</head>
<body>
<header>
<h1>Metric/Imperial Converter</h1>
</header>
<hr style='margin: 50px'>
<section>
<h3>Example usage</h3>
<code>/api/convert?input=4gal</code><br>
<code>/api/convert?input=1/2km</code><br>
<code>/api/convert?input=5.4/3lbs</code><br>
<code>/api/convert?input=kg</code><br>
<h3>Example return</h3>
<code>{ initNum: 3.1, initUnit: 'mi', returnNum: 4.98895, returnUnit: 'km', string: '3.1 miles converts to 4.98895 kilometers' }</code>
</section>
<hr style='margin: 50px'>
<section>
<div id='testui' >
<h3 style="text-align: left">Front-End</h3>
<form id="convertForm" class="border">
<input type="text" id="convertField" name="input" placeholder="3.1mi" style="width: 200px">
<input id="convert" type="submit" value='Convert!'>
</form>
<p id='result'></p>
<code id='jsonResult'></code>
</div>
</section>
<!-- Your web-app is https, so your scripts need to be too -->
<script src="https://code.jquery.com/jquery-2.2.1.min.js"
integrity="sha256-gvQgAFzTH6trSrAWoH1iPo9Xc96QxSZ3feW6kem+O00="
crossorigin="anonymous"></script>
<script>
$(function() {
$('#convertForm').submit(function(event) {
event.preventDefault();
$.ajax({
url: '/api/convert',
type: 'get',
data: $('#convertForm').serialize(),
success: function(data) {
$('#result').text(data.string || data);
$('#jsonResult').text(JSON.stringify(data));
}
});
});
});
</script>
</body>
</html>