socket.io-client


How to use

A standalone build of socket.io-client is exposed automatically by the
socket.io server as /socket.io/socket.io.js. Alternatively you can
serve the file socket.io.js found at the root of this repository.

<script src="/socket.io/socket.io.js"></script>
<script>
  var socket = io('http://localhost');
  socket.on('connect', function(){});
  socket.on('event', function(data){});
  socket.on('disconnect', function(){});
</script>

Socket.IO is compatible with browserify.

Node.JS (server-side usage)

Add socket.io-client to your package.json and then:

js var socket = require('socket.io-client')('http://localhost'); socket.on('connect', function(){}); socket.on('event', function(data){}); socket.on('disconnect', function(){});

API

IO(url:String, opts:Object):Socket

Exposed as the io namespace in the standalone build, or the result
of calling require('socket.io-client').

When called, it creates a new Manager for the given URL, and attempts
to reuse an existing Manager for subsequent calls, unless the
multiplex option is passed with false.

The rest of the options are passed to the Manager constructor (see below
for details).

A Socket instance is returned for the namespace specified by the
pathname in the URL, defaulting to /. For example, if the url is
http://localhost/users, a transport connection will be established to
http://localhost and a Socket.IO connection will be established to
/users.

IO#protocol

Socket.io protocol revision number this client works with.

IO#Socket

Reference to the Socket constructor.

IO#Manager

Reference to the Manager constructor.

IO#Emitter

Reference to the Emitter constructor.

Manager(url:String, opts:Object)

A Manager represents a connection to a given Socket.IO server. One or
more Socket instances are associated with the manager. The manager
can be accessed through the io property of each Socket instance.

The opts are also passed to engine.io upon initialization of the
underlying Socket.

Options:
- reconnection whether to reconnect automatically (true)
- reconnectionAttempts (Infinity) before giving up
- reconnectionDelay how long to initially wait before attempting a new
reconnection (1000). Affected by +/- randomizationFactor,
for example the default initial delay will be between 500 to 1500ms.
- reconnectionDelayMax maximum amount of time to wait between
reconnections (5000). Each attempt increases the reconnection delay by 2x
along with a randomization as above
- randomizationFactor (0.5), 0 <= randomizationFactor <= 1
- timeout connection timeout before a connect_error
and connect_timeout events are emitted (20000)
- autoConnect by setting this false, you have to call manager.open
whenever you decide it's appropriate

Events

• connect_error. Fired upon a connection error.
  Parameters:
  • Object error object
• connect_timeout. Fired upon a connection timeout.
• reconnect. Fired upon a successful reconnection.
  Parameters:
  • Number reconnection attempt number
• reconnect_attempt. Fired upon an attempt to reconnect.
• reconnecting. Fired upon an attempt to reconnect.
  Parameters:
  • Number reconnection attempt number
• reconnect_error. Fired upon a reconnection attempt error.
  Parameters:
  • Object error object
• reconnect_failed. Fired when couldn't reconnect within reconnectionAttempts
• ping. Fired when a ping packet is written out to the server.
• pong. Fired when a pong is received from the server.
  Parameters:
  • Number number of ms elapsed since ping packet (i.e.: latency).

The events above are also emitted on the individual sockets that
reconnect that depend on this Manager.

Manager#reconnection(v:Boolean):Manager

Sets the reconnection option, or returns it if no parameters
are passed.

Manager#reconnectionAttempts(v:Boolean):Manager

Sets the reconnectionAttempts option, or returns it if no parameters
are passed.

Manager#reconnectionDelay(v:Boolean):Manager

Sets the reconectionDelay option, or returns it if no parameters
are passed.

Manager#reconnectionDelayMax(v:Boolean):Manager

Sets the reconectionDelayMax option, or returns it if no parameters
are passed.

Manager#timeout(v:Boolean):Manager

Sets the timeout option, or returns it if no parameters
are passed.

Socket

Socket#id:String

A property on the socket instance that is equal to the underlying engine.io socket id.

The property is present once the socket has connected, is removed when the socket disconnects and is updated if the socket reconnects.

Socket#compress(v:Boolean):Socket

Sets a modifier for a subsequent event emission that the event data will
only be compressed if the value is true. Defaults to true when you don't call the method.

js socket.compress(false).emit('an event', { some: 'data' });

Events

• connect. Fired upon a connection including a successful reconnection.
• error. Fired upon a connection error
  Parameters:
  • Object error data
• disconnect. Fired upon a disconnection.
• reconnect. Fired upon a successful reconnection.
  Parameters:
  • Number reconnection attempt number
• reconnect_attempt. Fired upon an attempt to reconnect.
• reconnecting. Fired upon an attempt to reconnect.
  Parameters:
  • Number reconnection attempt number
• reconnect_error. Fired upon a reconnection attempt error.
  Parameters:
  • Object error object
• reconnect_failed. Fired when couldn't reconnect within reconnectionAttempts

License

MIT