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.
The new version of ExtJS 5 has requested to make a new major version of ExtJS-WebSocket.
Now, this new major version v1.0.0 is located on the master branch.
It's possible to work either with ExtJS 4 and Sencha Touch 2 with previous version v0.0.5
First of all, install Bower.
Then install Ext.ux.WebSocket (version v1.x.x for ExtJS 5):
$ bower install ext.ux.websocketOr install Ext.ux.WebSocket (version v0.0.5 for ExtJS 4 & Sencha Touch 2):
$ bower install ext.ux.websocket#0.0.5Now, you got the extension at the following path: YOUR_PROJECT_PATH/bower_components/ext.ux.websocket/
It contains WebSocket.js and WebSocketManager.js files.
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' ,
'Ext.ux.WebSocketManager': 'bower_components/ext.ux.websocket/WebSocketManager.js'
}
});
Ext.require (['Ext.ux.WebSocket', 'Ext.ux.WebSocketManager']);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);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);
}
}
});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);
});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);
});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);Follows some cool configurations to customize Ext.ux.WebSocket
By default, Ext.ux.WebSocket tries to re-open the connection with an internal task if it gets closed: it tries every 5 seconds.
Now, if you want to disable this behaviour, set autoReconnect to false:
var websocket = Ext.create ('Ext.ux.WebSocket', {
url: 'ws://localhost:8888' ,
autoReconnect: false
});In this case, when the server listens again, the websocket won't estabilish the connection. Otherwise, if you want to change the reconnect timeslice, set autoReconnectionInterval in milliseconds:
var websocket = Ext.create ('Ext.ux.WebSocket', {
url: 'ws://localhost:8888' ,
autoReconnect: true ,
autoReconnectInterval: 1000
});While in this case, the websocket tries to re-open the connection with the server every second.
Setting this config to true it will let the websocket to open the connection after its initialization:
var websocket = Ext.create ('Ext.ux.WebSocket', {
url: 'ws://localhost:8888' ,
lazyConnection: true
});
// other stuff
websocket.open ();When the open method is called, the websocket open the connection with the server. By default, this config is set to false
The connection gets closed by the server but the websocket still sends messages to it. By default, those messages are discarded but if you want to keep them and then send them back after the connection is re-estabilished, just set keepUnsentMessages to true:
var websocket = Ext.create ('Ext.ux.WebSocket', {
url: 'ws://localhost:8888' ,
keepUnsentMessages: true
});The websocket will send every unsent messages in one shot.
First of all, you need NodeJS and NPM.
Then, install every dependencies:
$ npm installOpen a websocket for each port you want:
$ node demo/server.js 9001 9002 9003Now, you have three websockets listening at 9001, 9002 and 9003 port on the server side! Then, type in the address bar of your browser: http://localhost/ExtJS-WebSocket/demo and play the demo ;)
You can build the documentation (like ExtJS Docs) with jsduck:
$ jsduck ux --output /var/www/docsIt will make the documentation into docs dir and it will be visible at: http://localhost/docs
The MIT License (MIT)
Copyright (c) 2013 Vincenzo Ferrari [email protected]
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The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
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