master.html

<!doctype html>
<html>
  <head>
    <title>Master Control</title>
    <style>
     #controls {
     	padding: 20px;
     }
     #scenes {
     	margin: auto;
     }
    </style>
    <script src="/socket.io/socket.io.js"></script>

  </head>
  <body>
    

    <div id="controls">

<div id="scenes">

<button id="cinematic">Scene 1 - Cinematic</button><br><br>

<button id="interactive_a">Scene 2a - Interactive - Accel</button><br><br>
<button id="interactive_b">Scene 2b - Interactive - Game</button><br><br>
<button id="interactive_c">Scene 2c - Interactive - Choice</button><br><br>

<button id="mixed">Scene 3 - Mixed</button><br><br>
<button id="phone">Scene 4 - Phone only</button><br><br>
<button id="three">Scene 5 - 3 Screen</button><br><br>


</div>


    </div>

<script language="Javascript">

var phone_shall;
var screen_shall;

  //initialise the socket connection
  var socket = io();

  document.getElementById("cinematic").addEventListener("click", cinematic);

function cinematic() {
            //screen command
            var s_msg = "<video autoplay><source src='test.mp4' type='video/mp4'></video>";
            //emit the message 
            socket.emit('master data screen', s_msg);

            //phone command
            var p_msg = "be empty";
            //emit the message 
            socket.emit('master data phone', p_msg);
}  

  document.getElementById("interactive_a").addEventListener("click", ia);

function ia() {
            //screen command
            var s_msg = "be interactive";
            //emit the message 
            socket.emit('master data screen', s_msg);

            //phone command
            var p_msg = "lets use the Accel";
            //emit the message 
            socket.emit('master data phone', p_msg);
}  

  document.getElementById("phone").addEventListener("click", justPhone);

function justPhone() {
            //screen command
            var s_msg = "nothing here";
            //emit the message 
            socket.emit('master data screen', s_msg);

            //phone command
            var p_msg = "<audio autoplay><source src='test.mp3' type='audio/mp3'></audio>";
            //emit the message 
            socket.emit('master data phone', p_msg);
}  


</script>

  </body>
</html>