javascriptclass/rateofchange.html at main · zachlucas1/javascriptclass · GitHub

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<!DOCTYPE HTML>
<html lang="en-us">
<head>
<meta charset="utf-8">
<title>Rate of Change</title>
    <script>
    function computeRateOfChange() {
        //input and convert to integer
        let previous = parseFloat(document.getElementById('prevPrice').value);
        let current = parseFloat(document.getElementById('currPrice').value);

        //math and rounding
        rateOfChange = parseFloat((current - previous) / previous).toFixed(4);

        //output
        document.getElementById('rate').innerHTML = rateOfChange;
    }
    </script>
</head>

<body>
    <h1>Rate of Change</h1>
    Previous Price <input type="text" id="prevPrice"><br>
    Current Price <input type="text" id="currPrice"><br>
    <button type="button" onclick="computeRateOfChange()">Rate of Change</button><br>
    Rate of Change <div id="rate"></div>
</body>
</html>