Yahoo! UI Library

io  3.3.0pr1

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Class io

The io class is a utility that brokers HTTP requests through a simplified interface. Specifically, it allows JavaScript to make HTTP requests to a resource without a page reload. The underlying transport for making same-domain requests is the XMLHttpRequest object. YUI.io can also use Flash, if specified as a transport, for cross-domain requests.

Properties

_cB - private static object

Object that stores callback handlers for cross-domain requests when using Flash as the transport.

_delay - static number

Delay value to calling the Flash transport, in the event io.swf has not finished loading. Once the E_XDR_READY event is fired, this value will be set to 0.

_headers - private static object

Object of default HTTP headers to be initialized and sent for all transactions.

_qState - private static int

Property to determine whether the queue is set to 1 (active) or 0 (inactive). When inactive, transactions will be stored in the queue until the queue is set to active.

_rS - private static object

Map of transaction readyState values used when XDomainRequest is the XDR transport.

_timeout - private static object

Object that stores timeout values for any transaction with a defined "timeout" configuration property.

_transport - private static object

Map of io transports.

_yQ - private static Object

Array of transactions queued for processing

transactionId - private static int

A transaction counter that increments for each transaction.

Methods

_abort

private static void _abort ( o , c )
Method for intiating an XDR transaction abort.
Parameters:
o <object> - Transaction object generated by _create() in io-base.
c <object> - configuration object for the transaction.

_clearTimeout

private static _clearTimeout ( id )
Clears the timeout interval started by _startTimeout().
Parameters:
id <number> - Transaction id.
Returns:
void

_concat

private static _concat ( s , d )
Method that concatenates string data for HTTP GET transactions.
Parameters:
s <string> - URI or root data.
d <string> - data to be concatenated onto URI.
Returns:
int

_create

private static _create ( c , i )
Method that creates a unique transaction object for each request.
Parameters:
c <number> - configuration object subset to determine if the transaction is an XDR or file upload, requiring an alternate transport.
i <number> - transaction id
Returns:
object

_data

private static _data ( o , f , t )
Creates a response object for XDR transactions, for success and failure cases.
Parameters:
o <object> - Transaction object generated by _create() in io-base.
f <boolean> - True if Flash was used as the transport.
t <boolean> - DataType value, as defined in the configuration.
Returns:
object

_destroy

private static void _destroy ( o , uri , c )
Parameters:
o <o> The transaction object
uri <object> Qualified path to transaction resource.
c <object> Configuration object for the transaction.

_evt

private static _evt ( o , c )
Sets event handlers for XDomainRequest transactions.
Parameters:
o <object> - Transaction object generated by _create() in io-base.
c <object> - configuration object for the transaction.
Returns:
void

_handle

private static void _handle ( o , c )
Bound to the iframe's Load event and processes the response data.
Parameters:
o <o> The transaction object
c <object> Configuration object for the transaction.

_handleResponse

private static _handleResponse ( o , c )
Method that determines if a transaction response qualifies as success or failure, based on the response HTTP status code, and fires the appropriate success or failure events.
Parameters:
o <object> - Transaction object generated by _create().
c <object> - Configuration object passed to io().
Returns:
void

_id

private static _id ( )
Method that increments _transactionId for each transaction.
Returns:
int

_io

private static _io ( uri , c , i )
Method for requesting a transaction. _io() is implemented as yui.io(). Each transaction may include a configuration object. Its properties are: method: HTTP method verb (e.g., GET or POST). If this property is not not defined, the default value will be GET. data: This is the name-value string that will be sent as the transaction data. If the request is HTTP GET, the data become part of querystring. If HTTP POST, the data are sent in the message body. xdr: Defines the transport to be used for cross-domain requests. By setting this property, the transaction will use the specified transport instead of XMLHttpRequest. The properties are: { use: Specify the transport to be used: 'flash' and 'native' dataType: Set the value to 'XML' if that is the expected response content type. } form: This is a defined object used to process HTML form as data. The properties are: { id: Node object or id of HTML form. useDisabled: Boolean value to allow disabled HTML form field values to be sent as part of the data. } on: This is a defined object used to create and handle specific events during a transaction lifecycle. These events will fire in addition to the global io events. The events are: start - This event is fired when a request is sent to a resource. complete - This event fires when the transaction is complete. success - This event fires when the response status resolves to HTTP 2xx. failure - This event fires when the response status resolves to HTTP 4xx, 5xx; and, for all transaction exceptions, including aborted transactions and transaction timeouts. end - This even is fired at the conclusion of the transaction lifecycle, after a success or failure resolution. The properties are: { start: function(id, arguments){}, complete: function(id, responseobject, arguments){}, success: function(id, responseobject, arguments){}, failure: function(id, responseobject, arguments){}, end: function(id, arguments){} } Each property can reference a function or be written as an inline function. sync: To enable synchronous transactions, set the configuration property "sync" to true; the default behavior is false. Synchronous transactions are limited to same-domain requests only. context: Object reference for all defined transaction event handlers when it is implemented as a method of a base object. Defining "context" will set the reference of "this," used in the event handlers, to the context value. In the case where different event handlers all have different contexts, use Y.bind() to set the execution context, bypassing this configuration. headers: This is a defined object of client headers, as many as. desired for the transaction. The object pattern is: { 'header': 'value' }. timeout: This value, defined as milliseconds, is a time threshold for the transaction. When this threshold is reached, and the transaction's Complete event has not yet fired, the transaction will be aborted. arguments: Object, array, string, or number passed to all registered event handlers. This value is available as the second argument in the "start" and "abort" event handlers; and, it is the third argument in the "complete", "success", and "failure" event handlers.
Parameters:
uri <string> - qualified path to transaction resource.
c <object> - configuration object for the transaction.
i <number> - transaction id, if already set.
Returns:
object

_ioCancel

private static _ioCancel ( o , s )
Terminates a transaction due to an explicit abort or timeout.
Parameters:
o <object> - Transaction object generated by _create().
s <string> - Identifies timed out or aborted transaction.
Returns:
void

_ioComplete

private static _ioComplete ( o , c )
Fires event "io:complete" and creates, fires a transaction-specific "complete" event, if config.on.complete is defined.
Parameters:
o <object> - transaction object.
c <object> - configuration object for the transaction.
Returns:
void

_ioEnd

private static _ioEnd ( o , c )
Fires event "io:end" and creates, fires a transaction-specific "end" event, if config.on.end is defined.
Parameters:
o <object> - transaction object.
c <object> - configuration object for the transaction.
Returns:
void

_ioFailure

private static _ioFailure ( o , c )
Fires event "io:failure" and creates, fires a transaction-specific "failure" event, if config.on.failure is defined.
Parameters:
o <object> - transaction object.
c <object> - configuration object for the transaction.
Returns:
void

_ioStart

private static _ioStart ( id , c )
Fires event "io:start" and creates, fires a transaction-specific start event, if config.on.start is defined.
Parameters:
id <number> - transaction id
c <object> - configuration object for the transaction.
Returns:
void

_ioSuccess

private static _ioSuccess ( o , c )
Fires event "io:success" and creates, fires a transaction-specific "success" event, if config.on.success is defined.
Parameters:
o <object> - transaction object.
c <object> - configuration object for the transaction.
Returns:
void

_isInProgress.

private static void _isInProgress. ( o )
Method for determining if an XDR transaction has completed and all data are received.
Parameters:
o <object> - Transaction object generated by _create() in io-base.

_queue

private static _queue ( )
Method for requesting a transaction, and queueing the request before it is sent to the resource.
Returns:
Object

_readyState

private static _readyState ( o , c )
Event handler bound to onreadystatechange.
Parameters:
o <object> - Transaction object generated by _create().
c <object> - Configuration object passed to YUI.io().
Returns:
void

_remove

private static _remove ( )
Method for removing a specific, pending transaction from the queue.
Returns:
void

_resend

private static _resend ( o , uri , c )
Resends an XDR transaction, using the Flash tranport, if the native transport fails.
Parameters:
o <object> - Transaction object generated by _create().
uri <string> - qualified path to transaction resource.
c <object> - configuration object for the transaction.
Returns:
void

_resetAttrs

private static void _resetAttrs ( f , a )
Sets the appropriate attributes and values to the HTML form, in preparation of a file upload transaction.
Parameters:
f <object> HTML form object.
a <object> Object of original attributes.

_serialize

private static _serialize ( c , s )
Method to enumerate through an HTML form's elements collection and return a string comprised of key-value pairs.
Parameters:
c <object> - YUI form node or HTML form id.
s <string> - Transaction data defined in the configuration.
Returns:
string

_setAttrs

private static void _setAttrs ( f , id , uri )
Sets the appropriate attributes and values to the HTML form, in preparation of a file upload transaction.
Parameters:
f <object> HTML form object.
id <object> The Transaction ID.
uri <object> Qualified path to transaction resource.

_setHeader

private static _setHeader ( l , v )
Method that stores default client headers for all transactions. If a label is passed with no value argument, the header will be deleted.
Parameters:
l <string> - HTTP header
v <string> - HTTP header value
Returns:
int

_setHeaders

private static _setHeaders ( o , h )
Method that sets all HTTP headers to be sent in a transaction.
Parameters:
o <object> - XHR instance for the specific transaction.
h <object> - HTTP headers for the specific transaction, as defined in the configuration object passed to YUI.io().
Returns:
void

_shift

private static _shift ( )
Method Process the first transaction from the queue in FIFO order.
Returns:
void

_size

private static _size ( )
Method to query the current size of the queue.
Returns:
int

_startTimeout

private static _startTimeout ( o , t )
Starts timeout count if the configuration object has a defined timeout property.
Parameters:
o <object> - Transaction object generated by _create().
t <object> - Timeout in milliseconds.
Returns:
void

_stop

private static _stop ( )
Method for setting queue processing to inactive. Transaction requests to YUI.io.queue() will be stored in the queue, but not processed until the queue is reset to "active".
Returns:
void

_swf

private static _swf ( uri , yid )
Method that creates the Flash transport swf.
Parameters:
uri <string> - location of io.swf.
yid <string> - YUI instance id.
Returns:
void

_tE

private static _tE ( e , c )
Method for creating and subscribing transaction events.
Parameters:
e <string> - event to be published
c <object> - configuration data subset for event subscription.
Returns:
void

_unshift

private static _unshift ( )
Method for promoting a transaction to the top of the queue.
Returns:
void

_upload

private static void _upload ( o , uri , c )
Uploads HTML form data, inclusive of files/attachments, using the iframe created in _create to facilitate the transaction.
Parameters:
o <o> The transaction object
uri <object> Qualified path to transaction resource.
c <object> Configuration object for the transaction.

_xhr

private static _xhr ( )
Method that creates the XMLHttpRequest transport
Returns:
object

appendData

private static array appendData ( f , s )
Parses the POST data object and creates hidden form elements for each key-value, and appends them to the HTML form object.
Parameters:
f <object> HTML form object.
s <string> The key-value POST data.
Returns: array
e Array of created fields.

f

private static void f ( f , o )
Removes the custom fields created to pass additional POST data, along with the HTML form fields.
Parameters:
f <object> HTML form object.
o <object> HTML form fields created from configuration.data.

header

static header ( l , v )
Method that stores default client headers for all transactions. If a label is passed with no value argument, the header will be deleted. This is the interface for _setHeader().
Parameters:
l <string> - HTTP header
v <string> - HTTP header value
Returns:
int

io

static io ( uri , c )
Method for requesting a transaction. This is the interface for _io().
Parameters:
uri <string> - qualified path to transaction resource.
c <object> - configuration object for the transaction.
Returns:
object

promote

static promote ( o )
Method for promoting a transaction to the top of the queue. This is the interface for _unshift().
Parameters:
o <Object> - Reference to queued transaction.
Returns:
void

remove

static remove ( o )
Method for removing a specific, pending transaction from the queue. This is the interface for _remove().
Parameters:
o <Object> - Reference to queued transaction.
Returns:
void

size

static size ( i )
Method to query the current size of the queue, or to set a maximum queue size. This is the interface for _size().
Parameters:
i <number> - Specified maximum size of queue.
Returns:
number

start

static start ( )
Method for setting the queue to active. If there are transactions pending in the queue, they will be processed from the queue in FIFO order. This is the interface for _start().
Returns:
void

stop

static stop ( )
Method for setting queue processing to inactive. Transaction requests to YUI.io.queue() will be stored in the queue, but not processed until the queue is restarted. This is the interface for _stop().
Returns:
void

transport

static transport ( o )
Method to initialize the desired transport.
Parameters:
o <object> - object of transport configurations.
Returns:
void

xdr

private static void xdr ( uri , o , c )
Method for accessing the transport's interface for making a cross-domain transaction.
Parameters:
uri <string> - qualified path to transaction resource.
o <object> - Transaction object generated by _create() in io-base.
c <object> - configuration object for the transaction.

xdrReady

private static xdrReady ( id , c )
Fires event "io:xdrReady"
Parameters:
id <number> - transaction id
c <object> - configuration object for the transaction.
Returns:
void

xdrResponse

private static xdrResponse ( o , c , e )
Response controller for cross-domain requests when using the Flash transport or IE8's XDomainRequest object.
Parameters:
o <object> - Transaction object generated by _create() in io-base.
c <object> - configuration object for the transaction.
e <string> - Event name
Returns:
object

Events

io:complete

io:complete ( )
This event is fired by YUI.io when a transaction is complete. Response status and data are accessible, if available.

io:end

io:end ( )
This event signifies the end of the transaction lifecycle. The transaction transport is destroyed.

io:failure

io:failure ( )
This event is fired by YUI.io when a transaction is complete, and the HTTP status resolves to HTTP4xx, 5xx and above.

io:start

io:start ( )
This event is fired by YUI.io when a transaction is initiated.

io:success

io:success ( )
This event is fired by YUI.io when a transaction is complete, and the HTTP status resolves to HTTP2xx.

io:xdrReady

io:xdrReady ( )
This event is fired by YUI.io when the specified transport is ready for use.

Classes

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