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API documentation
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darrachequesne committed Dec 17, 2016
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Expand Up @@ -41,149 +41,7 @@ Socket.IO is compatible with [browserify](http://browserify.org/).

## 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`
See [API](/docs/API.md)

## License

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