simple-websocket.js

var websocket

function doConnect()
{
  websocket = new WebSocket('ws://localhost:8000/')
  websocket.onopen = function(evt) { onOpen(evt) }
  websocket.onclose = function(evt) { onClose(evt) }
  websocket.onmessage = function(evt) { onMessage(evt) }
  websocket.onerror = function(evt) { onError(evt) }
}

function onOpen(evt) {
  console.log('websocket opened')
}

function onClose(evt) {
  console.log('websocket closed')
}

function onMessage(evt) {
  var data = evt.data
  // do whatever you want here
}

function onError(evt) {
  var error = evt.data
  console.log('websocket error', error);
  
  websocket.close();
}

function sendMessage(message) {
  websocket.send(message);
}

function doDisconnect() {
  websocket.close();
 }

// call doConnect() to connect, doDisconnect() to disconnect, sendMessage(data) to send a message, and add your receiver code to onMessage