Engine.IO client


This is the client for Engine, the
implementation of transport-based cross-browser/cross-device bi-directional
communication layer for Socket.IO.

Hello World

``html


`

Features

- Lightweight
- Lazyloads Flash transport
- Isomorphic with WebSocket API
- Written for node, runs on browser thanks to
browserbuild
- Maximizes code readability / maintenance.
- Simplifies testing.
- Transports are independent of Engine
- Easy to debug
- Easy to unit test
- Runs inside HTML5 WebWorker

API

These are exposed in the eio global namespace (in the browser), or by
require('engine.io-client') (in Node.JS).

#### Properties

- version _(String)_: client version
- protocol _(Number)_: protocol revision number
- Socket _(Function)_: client constructor

$3

The client class. _Inherits from EventEmitter_.

#### Properties

- onopen (_Function_)
- open event handler
- onmessage (_Function_)
- message event handler
- onclose (_Function_)
- message event handler

#### Events

- open
- Fired upon successful connection.
- message
- Fired when data is received from the server.
- Arguments
- String: utf-8 encoded data
- close
- Fired upon disconnection.
- error
- Fired when an error occurs.

#### Methods

- constructor
- Initializes the client
- Parameters
- Object: optional, options object
- Options
- host (String): host name (localhost)
- port (Number): port name (80)
- path (String): path to intercept requests to (/engine.io)
- resource (String): name of resource for this server (default).
Setting a resource allows you to initialize multiple engine.io
endpoints on the same host without them interfering, and without
changing the path directly.
- query (Object): optional query string addition (eg: { a: 'b' })
- secure (Boolean): whether the connection is secure
- upgrade (Boolean): defaults to true, whether the client should try
to upgrade the transport from long-polling to something better.
- forceJSONP (Boolean): forces JSONP for polling transport.
- flashPath (String): path to flash client files
- transports (Array): a list of transports to try (in order).
Defaults to ['polling', 'websocket', 'flashsocket']. Engine
always attempts to connect directly with the first one, provided the
feature detection test for it passes.
- send
- Sends a message to the server
- Parameters
- String: data to send
- close
- Disconnects the client.

Flash transport

In order for the Flash transport to work correctly, set the following:

``js
WEB_SOCKET_SWF_LOCATION = '/path/to/WebSocketMainInsecure.swf';
`

Tests

engine.io-client is used to test
engine

Support

The support channels for engine.io-client are the same as socket.io:
- irc.freenode.net #socket.io
- Google Groups
- Website

Development

To contribute patches, run tests or benchmarks, make sure to clone the
repository:

`
git clone git://github.com/LearnBoost/engine.io-client.git
`

Then:

`
cd engine.io-client
npm install
``

License

(The MIT License)

Copyright (c) 2011 Guillermo Rauch <guillermo@learnboost.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.