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Showing posts from June, 2012

Checking for WebSocket Support on Your Web Browser

It’s frustrating to execute some code and don’t see anything happening after that. But, depending on the web browser you or the end user running your application is using that may be impacting the WebSocket functionality at this point since not all current browsers in use support HTML5 WebSocket natively yet.
So, let’s take a look on some techniques to make the web browser supports WebSocket.
We are going to use the JavaScript console available in all web browsers to start with the WebSocket support investigation. Each web browser has a different way to initiate the JavaScript console but if you’re using the suggested web browser (Google Chrome) take a look on the following resource to learn more about it (https://developers.google.com/chrome-developer-tools/docs/overview).
If you open your browser’s interactive JavaScript console and evaluate the expression window.WebSocket you should see the WebSocket constructor object:
function WebSocket() { [native code] }

which means that your w…

The WebSocket readyState attribute

The WebSocket object will report the state of its connection through a read-only attribute called readyState.

There are four different values that the readyState attribute can receive to represent the state of the connection.

0 - CONNECTING – The connection has not been established yet.
1 - OPEN – The connection has been established and messages can be exchanged between the client and the server.
2 - CLOSING – The connection is going through the closing handshake.
3 - CLOSED – The connection has been closed or could not be opened.

When the WebSocket object is first created its readyState is 0, indicating that the socket is CONNECTING.