Connect.js

// This is the JavaScript file for the basic LabVIEW WebSockets demo.
// Copyright © 2016 by MediaMongrels Ltd. 
class Connect {
    constructor(port, ind) {
        this.ind = ind.toString();
        this.num = port;
        this.sendString = '#port' + this.ind + 'send';
        this.chatString = '#port' + this.ind + 'chat';
        
        this.host = "ws://localhost:" + this.num;
        
        this.socket = new WebSocket(this.host);
        
        this.attachHandlers();
        this.sendMessage();
        
    }
    
    sendMessage(){
        try
        {  
            this.message('<p class="event">Socket Status: ' + this.socket.readyState + ' (create)', this.chatString);
            // Tell the user the connection has been established
            this.socket.onopen = function(){  
                this.message('<p class="event">Socket Status: ' + connect.socket.readyState + ' (open)', this.chatString);  
            }.bind(this)
            // Display the received message
            this.socket.onmessage = function(msg){  
                this.message('<p class="message">Received: ' + msg.data, this.chatString);  
            }.bind(this)
            // Tell the user the connection has been closed
            this.socket.onclose = function(){  
                this.message('<p class="event">Socket Status: ' + connect.socket.readyState + ' (Closed)', this.chatString);  
            }.bind(this)
        } 
        catch(exception){  
            this.message('<p>Error' + exception, this.chatString);  
        }  
    }
    
    attachHandlers(){
        $(this.sendString).keypress(function(event) {  
            if (event.keyCode == '13') {  
                this.send(this.sendString);  
            }  
        });     
        
        // Close the connection from the client side
        $('#port' + this.num + 'disconnect').click(function(){  
            this.socket.close();  
        });
        
        $('#error').text('port ' + this.ind + ' processed...');
    }
    
    message(msg, ctrl){  
        $(ctrl).append(msg + ' :' + this.ind + '</p>');
    } 
    
    send(ctrl){
        var text = $(ctrl).text();  
        $(ctrl).text("");
        if(text == ""){  
            this.message('<p class="warning">Please enter a message');  
            return;  
        } 
        
        try {  
            connect.socket.send(text);  
            this.message('<p class="event">Sent: '+text,ctrl.slice(0,6)+'chat')  
            
        } catch(exception){  
            this.message('<p class="warning">');
        } 
    }
}

var port = 3000
var firstConnection = new Connect(port, 1)