Sample WebSocket client in JavaScript

samplewebsocketclient.js

var webSocketClient;

function connectToWebSocketServer() {
  webSocketClient = new WebSocket('ws://localhost:1111/some/resource/');
  webSocketClient.onopen = function() { alert('connection opened'); };
  webSocketClient.onerror = function() { alert('connection error'); };
  webSocketClient.onclose = function() { alert('connection closed'); };
  webSocketClient.onmessage = function(msg) { alert('msg: '+msg.data); };
}

connectToWebSocketServer();
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.
.
if(webSocketClient && webSocketClient.readyState == 1) {
  webSocketClient.send("Hello world!");
}