websocket-connection.js

// When the document has loaded
document.addEventListener('DOMContentLoaded', function() {
    // Connect to the websocket
    connect();
    // And add our event listeners
    document.getElementById('websocket-button').addEventListener('click', function(e) {
        if(isOpen(socket)) {
            socket.send(JSON.stringify({
                "data" : "this is our data to send",
                "other" : "this can be in any format"
            }))
        }
    });
});