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 at the same time.

Install via Bower

First of all, install Bower.

Then install Ext.ux.WebSocket:

$ bower install ext.ux.websocket

Now, you got the extension at the following path: YOUR_PROJECT_PATH/bower_components/ext.ux.websocket/

It contains WebSocket.js and WebSocketManager.js files and a minified version WebSocket.min.js adn WebSocketManager.min.js.

Let's setup the Ext.Loader to require the right file:

Ext.Loader.setConfig ({
	enabled: true ,
	paths: {
		'Ext.ux.WebSocket': 'bower_components/ext.ux.websocket/WebSocket.js' ,
		// or the minified one: 'Ext.ux.WebSocket': 'bower_components/ext.ux.websocket/WebSocket.min.js' ,
		'Ext.ux.WebSocketManager': 'bower_components/ext.ux.websocket/WebSocketManager.js'
		// or the minified one: 'Ext.ux.WebSocketManager': 'bower_components/ext.ux.websocket/WebSocketManager.min.js'
	}
});

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

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: 'ws://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: 'ws://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: 'ws://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: 'ws://localhost:8888'
});

Ext.ux.WebSocketManager.register (ws1);

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

Ext.ux.WebSocketManager.register (ws2);

var ws3 = Ext.create ('Ext.ux.WebSocket', {
	url: 'ws://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 be 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

Python 2.7

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)$ pip install tornado

Finally, start the server:

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

Python 3.3

First of all, install Tornado:

$ sudo apt-get install python3-tornado

Then, start the server:

$ python3.3 /var/www/ExtJS-WebSocket/demo/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/demo 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

The MIT License (MIT)

Copyright (c) 2013 Vincenzo Ferrari wilk3ert@gmail.com

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.