ExtJS-WebSocket

ExtJS-WebSocket is an extension to handle and use the HTML5 WebSocket with ExtJS. It has two classes: Ext.ux.WebSocket and Ext.ux.WebSocketManager The first one is a wrapper for standard HTML5 WebSocket and it provides a lot of interesting and easy-to-use features. The second one is a singleton to register different Ext.ux.WebSocket and it provides functions to work with every registered websocket in the same time.

Usage

Load Ext.ux.WebSocket and Ext.ux.WebSocketManager via Ext.require:

Ext.Loader.setConfig ({
	enabled: true
});

Ext.require (['Ext.ux.WebSocket', 'Ext.ux.WebSocketManager']);

Now, you are ready to use them in your code as follows:

// Creating a new instance of Ext.ux.WebSocket
var ws = Ext.create ('Ext.ux.WebSocket', {
	url: 'your_url:your_port' ,
	protocol: 'your_protocol'
});

// Using Ext.ux.WebSocketManager
Ext.ux.WebSocketManager.register (ws);

Communications supported

Pure text communication

The communication is text-only, without objects or any other kind of data.

var websocket = Ext.create ('Ext.ux.WebSocket', {
	url: 'http://localhost:8888' ,
	listeners: {
		open: function (ws) {
			console.log ('The websocket is ready to use');
			ws.send ('This is a simple text');
		} ,
		close: function (ws) {
			console.log ('The websocket is closed!');
		} ,
		error: function (ws, error) {
			Ext.Error.raise (error);
		} ,
		message: function (ws, message) {
			console.log ('A new message is arrived: ' + message);
		}
	}
});

Pure event-driven communication

The communication is event-driven: an event and a String or Object are sent and the websocket handles different events.

var websocket = Ext.create ('Ext.ux.WebSocket', {
	url: 'http://localhost:8888' ,
	listeners: {
		open: function (ws) {
			console.log ('The websocket is ready to use');
			ws.send ('init', 'This is a simple text');
			ws.send ('and continue', {
				'my': 'data' ,
				'your': 'data'
			});
		} ,
		close: function (ws) {
			console.log ('The websocket is closed!');
		}
	}
});

// A 'stop' event is sent from the server
// 'data' has 'cmd' and 'msg' fields
websocket.on ('stop', function (data) {
	console.log ('Command: ' + data.cmd);
	console.log ('Message: ' + data.msg);
});

Mixed communication

The communication is mixed: it can handles text-only and event-driven communication.

var websocket = Ext.create ('Ext.ux.WebSocket', {
	url: 'http://localhost:8888' ,
	listeners: {
		open: function (ws) {
			console.log ('The websocket is ready to use');
			ws.send ('This is only-text message');
			ws.send ('init', 'This is a simple text');
			ws.send ('and continue', {
				'my': 'data' ,
				'your': 'data'
			});
		} ,
		close: function (ws) {
			console.log ('The websocket is closed!');
		} ,
		message: function (ws, message) {
			console.log ('Text-only message arrived is: ' + message);
		}
	}
});

// A 'stop' event is sent from the server
// 'data' has 'cmd' and 'msg' fields
websocket.on ('stop', function (data) {
	console.log ('Command: ' + data.cmd);
	console.log ('Message: ' + data.msg);
});

Ext.ux.WebSocketManager features

Here's an example of the manager:

var ws1 = Ext.create ('Ext.ux.WebSocket', {
	url: 'http://localhost:8888'
});

Ext.ux.WebSocketManager.register (ws1);

var ws2 = Ext.create ('Ext.ux.WebSocket', {
	url: 'http://localhost:8900'
});

Ext.ux.WebSocketManager.register (ws2);

var ws3 = Ext.create ('Ext.ux.WebSocket', {
	url: 'http://localhost:8950'
});

Ext.ux.WebSocketManager.register (ws3);

Ext.ux.WebSocketManager.listen ('system shutdown', function (ws, data) {
	Ext.Msg.show ({
		title: 'System Shutdown' ,
		msg: data ,
		icon: Ext.Msg.WARNING ,
		buttons: Ext.Msg.OK
	});
});

// This will handled by everyone
Ext.ux.WebSocketManager.broadcast ('system shutdown', 'BROADCAST: the system will shutdown in few minutes.');

Ext.ux.WebSocketManager.closeAll ();

Ext.ux.WebSocketManager.unregister (ws1);
Ext.ux.WebSocketManager.unregister (ws2);
Ext.ux.WebSocketManager.unregister (ws3);

Run the demo

I suggest to use virtualenv to test the demo.

First of all, you need virtualenv:

$ sudo apt-get install virtualenv

Then, make a virtual environment:

$ virtualenv venv

And install Tornado:

$ . /venv/bin/activate
(venv)$ easy_install tornado

Finally, start the server:

(venv)$ python /var/www/ExtJS-WebSocket/server.py 8888 9999 10000

Now, you have three websockets listening at 8888, 9999 and 10000 port on the server side! Then, type in the address bar of your browser: http://localhost/ExtJS-WebSocket and play the demo ;)

Documentation

You can build the documentation (like ExtJS Docs) with jsduck:

$ jsduck ux --output /var/www/docs

It will make the documentation into docs dir and it will be visible at: http://localhost/docs

License

(GNU GPLv3)

Copyright (c) 2012 Vincenzo Ferrari wilk3ert@gmail.com

This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program. If not, see http://www.gnu.org/licenses/.