How to write Distance converter program with jQuery + javascript + HTML

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Demo

Code

<html>

<head>
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
    <script>
        $(document).ready(function() {
            $("#btn").click(function() {
                console.log("after click");
                var from = $("#cfrom").val();
                console.log("selected from value is " + from);

                var to = $("#cto").val();
                console.log("selected to value is " + to);

                var input = $("#value").val();
                console.log("selected input value is " + input);
                var output = -1;

                if (from == to) {
                    alert("check your from & to values");
                }

                if (from == 'Meters' && to == 'Kilometers') {
                    output = (+input) / 1000;
                } else if (from == 'Kilometers' && to == 'Meters') {
                    output = ((+input) * (1000))
                } else if (from == 'Miles' && to == 'Kilometers') {
                    output = ((+input) * (1.6))
                } else if (from == 'Kilometers' && to == 'Miles') {
                    output = ((+input) / (1.6))
                } else if (from == 'Millimeters' && to == 'Centemeters') {
                    output = ((+input) / (10))
                } else if (from == 'Centemeters' && to == 'Millimeters') {
                    output = ((+input) * (10))
                } else if (from == 'Centemeters' && to == 'Meters') {
                    output = ((+input) / (100))
                } else if (from == 'Meters' && to == 'Centemeters') {
                    output = ((+input) * (100))
                }

                // 2 kilometers = 2000 meters
                output = input + " " + from + " = " + output + " " + to
                console.log("output value is" + output);
                $("#result").html(output);
            });
        });
    </script>
</head>

<body>

    Convert From :
    <select id="cfrom">
<option selected="selected"> Meters </option>
<option> Kilometers </option>
<option> Inches </option>
<option> Miles </option>
<option> Millimeters </option>
<option> Centemeters </option>
</select><br><br> Convert To :
    <select id="cto">
<option selected="selected"> Meters </option>
<option> Kilometers </option>
<option> Inches </option>
<option> Miles </option>
<option> Millimeters </option>
<option> Centemeters </option>
</select><br><br> Value:
    <input type="text" name="number" id="value"></input><br><br>
    <button id="btn"> Convert </button>
    <p id="result"></p>
</body>

</html>
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