Mongoose os example of toggling led using index.html

index.html

<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>

<div id="notifications"></div>

<a href="/rpc/Control" >Toggle Led</a>

<script>
$('a').click(function(event) {
    event.preventDefault();
    $.ajax({
        url: $(this).attr('href'),
        success: function(response) {
            if(response == '0'){
                text = 'Led is OFF'
            } else {
                text = 'Led is ON'
            }
            document.getElementById("notifications").innerHTML = text;
        }
    });
    return false;
});
</script>

init.js

load('api_gpio.js');
load('api_rpc.js');

let led = 16;
GPIO.set_mode(led, GPIO.MODE_OUTPUT);

RPC.addHandler('Control', function(args) {
  let result = GPIO.toggle(led);
  return result;
});