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![Following is the API which creates a new
WebSocket object.
var Socket = new
WebSocket(url, [protocal] );
Here first argument, url, specifies the URL to
which to connect. The second attribute,
protocol is optional, and if present, specifies
a sub-protocol that the server must support
for the connection to be successful.](https://image.slidesharecdn.com/websockets-241211024139-c1afdae4/85/presentation-in-net-programming-web-sockets-pptx-4-320.jpg)
![Following is the API which creates a new
WebSocket object.
var Socket = new
WebSocket(url, [protocal] );
Here first argument, url, specifies the URL to
which to connect. The second attribute,
protocol is optional, and if present, specifies
a sub-protocol that the server must support
for the connection to be successful.](https://image.slidesharecdn.com/websockets-241211024139-c1afdae4/75/presentation-in-net-programming-web-sockets-pptx-4-2048.jpg)
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Similar to presentation in .net programming web sockets.pptx
presentation in .net programming web sockets.pptx
- 1.
- 2. Web Sockets isa next-generation bidirectional communication technology for web applications which operates over a single socket and is exposed via a JavaScript interface in HTML 5 compliant browsers.
- 3. Once you geta Web Socket connection with the web server, you can send data from browser to server by calling a send() method, and receive data from server to browser by an onmessage event handler.
- 4. Following is theAPI which creates a new WebSocket object. var Socket = new WebSocket(url, [protocal] ); Here first argument, url, specifies the URL to which to connect. The second attribute, protocol is optional, and if present, specifies a sub-protocol that the server must support for the connection to be successful.
- 5. WebSocket Attributes Following arethe attribute of WebSocket object. Assuming we created Socket object as mentioned above − Attribute Description Socket.bu fferedAm ount The readonly attribute bufferedAmountrepr esents the number of bytes of UTF-8 text that have been queued using send() method.
- 6. WebSocket Events Following arethe events associated with WebSocket object. Assuming we created Socket object as mentioned above − Event Event Handler Description open Socket.onopen This event occurs when socket connection is established.
- 7. WebSocket Events Event EventHandler Description message Socket.onmess age This event occurs when client receives data from server. error Socket.onerror This event occurs when there is any error in communication. close Socket.onclose This event occurs when connection is closed.
- 8. WebSocket Methods Following arethe methods associated with WebSocket object. Assuming we created Socket object as mentioned above − Method Description Socket.send() The send(data) method transmits data using the connection. Socket.close() The close() method would be used to terminate any existing connection.
- 9. WebSocket Example A WebSocketis a standard bidirectional TCP socket between the client and the server. The socket starts out as a HTTP connection and then "Upgrades" to a TCP socket after a HTTP handshake. After the handshake, either side can send data.
- 10. WebSocket Example <!DOCTYPE HTML> <html> <head> <scripttype="text/javascript"> function WebSocketTest() { if ("WebSocket" in window) { alert("WebSocket is supported by your Browser!"); // Let us open a web socket var ws = new WebSocket("ws://localhost:9998/echo"); ws.onopen = function() { // Web Socket is connected, send data using send() ws.send("Message to send"); alert("Message is sent..."); }; ws.onmessage = function (evt) { var received_msg = evt.data;
- 11. Install pywebsocket Before youtest above client program, you need a server which supports WebSocket. Download mod_pywebsocket-x.x.x.tar.gz from pywebsocket which aims to provide a Web Socket extension for Apache HTTP Server and install it following these steps.
- 12. Install pywebsocket • Unzipand untar the downloaded file. • Go inside pywebsocket-x.x.x/src/ directory. • $python setup.py build • $sudo python setup.py install • Then read document by: • $pydoc mod_pywebsocket • This will install it into your python environment.
- 13. Start the Server •Go to the pywebsocket-x.x.x/src/mod_pywebsoc ket folder and run the following command − $sudo python standalone.py -p 9998 -w ../example/
- 14. Start the Server Thiswill start the server listening at port 9998 and use the handlers directory specified by the -w option where our echo_wsh.py resides. Now using Chrome browser open the html file your created in the beginning. If your browser supports WebSocket(), then you would get alert indicating that your browser supports WebSocket and finally when you click on "Run WebSocket" you would get Goodbye message sent by the server script.