io.js revision 95a601536f7d11c82ccf1b5efc37310c89de92fd
/**
* Base IO functionality. Provides basic XHR transport support.
* @module io
* @submodule io-base
*/
/**
* 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.
*
* @class io
*/
/**
* @event io:start
* @description This event is fired by YUI.io when a transaction is initiated.
* @type Event Custom
*/
var E_START = 'io:start',
/**
* @event io:complete
* @description This event is fired by YUI.io when a transaction is complete.
* Response status and data are accessible, if available.
* @type Event Custom
*/
E_COMPLETE = 'io:complete',
/**
* @event io:success
* @description This event is fired by YUI.io when a transaction is complete, and
* the HTTP status resolves to HTTP2xx.
* @type Event Custom
*/
E_SUCCESS = 'io:success',
/**
* @event io:failure
* @description This event is fired by YUI.io when a transaction is complete, and
* the HTTP status resolves to HTTP4xx, 5xx and above.
* @type Event Custom
*/
E_FAILURE = 'io:failure',
/**
* @event io:end
* @description This event signifies the end of the transaction lifecycle. The
* transaction transport is destroyed.
* @type Event Custom
*/
E_END = 'io:end',
//--------------------------------------
// Properties
//--------------------------------------
/**
* @description A transaction counter that increments for each transaction.
*
* @property transactionId
* @private
* @static
* @type int
*/
transactionId = 0,
/**
* @description Object of default HTTP headers to be initialized and sent
* for all transactions.
*
* @property _headers
* @private
* @static
* @type object
*/
_headers = {
'X-Requested-With' : 'XMLHttpRequest'
},
/**
* @description Object that stores timeout values for any transaction with
* a defined "timeout" configuration property.
*
* @property _timeOut
* @private
* @static
* @type object
*/
_timeout = {},
// Window reference
//--------------------------------------
// Methods
//--------------------------------------
/**
* @description 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. Currently, the only alternate
* transport supported is Flash (e.g., { xdr: 'flash' }).
*
* form: This is a defined object used to process HTML form as data. The
* properties are:
* {
* id: object, //HTML form object or id of HTML form
* useDisabled: boolean, //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, args){},
* complete: function(id, responseobject, args){},
* success: function(id, responseobject, args){},
* failure: function(id, responseobject, args){},
* end: function(id, args){}
* }
* Each property can reference a function or be written as an
* inline function.
*
* context: Object reference for an event handler when it is implemented
* as a method of a base object. Defining "context" will preserve
* the proper reference of "this" used in the event handler.
* headers: This is a defined object of client headers, as many as.
* desired for the transaction. These headers are sentThe 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.
*
* @method _io
* @private
* @static
* @param {string} uri - qualified path to transaction resource.
* @param {object} c - configuration object for the transaction.
* @return object
*/
var u, f,
// Set default value of argument c to Object if
// configuration object "c" does not exist.
c = c || {},
o.abort = function () {
};
o.isInProgress = function() {
return s;
};
/* Determine configuration properties */
// If config.form is defined, perform data operations.
if (c.form) {
return u;
}
// Serialize the HTML form into a string of name-value pairs.
// If config.data is defined, concatenate the data to the form string.
if (d) {
f += "&" + d;
}
if (m === 'POST') {
d = f;
}
else if (m === 'GET') {
}
}
else if (d && m === 'POST') {
}
if (c.xdr) {
return o;
}
// If config.timeout is defined, and the request is standard XHR,
// initialize timeout polling.
if (c.timeout) {
_startTimeout(o, c.timeout);
}
/* End Configuration Properties */
o.c.onreadystatechange = function() { _readyState(o, c); };
_setHeaders(o.c, (c.headers || {}));
// Do not pass null, in the absence of data, as this
// will result in a POST request with no Content-Length
// defined.
_async(o, (d || ''), c);
return o;
}
/**
* @description Method for creating and subscribing transaction events.
*
* @method _tPubSub
* @private
* @static
* @param {string} e - event to be published
* @param {object} c - configuration data subset for event subscription.
*
* @return void
*/
function _tPubSub(e, c){
return event;
}
/**
* @description Fires event "io:start" and creates, fires a
* transaction-specific start event, if config.on.start is
* defined.
*
* @method _ioStart
* @private
* @static
* @param {number} id - transaction id
* @param {object} c - configuration object for the transaction.
*
* @return void
*/
// Set default value of argument c, property "on" to Object if
// the property is null or undefined.
if (fn) {
}
}
}
/**
* @description Fires event "io:complete" and creates, fires a
* transaction-specific "complete" event, if config.on.complete is
* defined.
*
* @method _ioComplete
* @private
* @static
* @param {object} o - transaction object.
* @param {object} c - configuration object for the transaction.
*
* @return void
*/
function _ioComplete(o, c) {
var r, event;
// Set default value of argument c, property "on" to Object if
// the property is null or undefined.
}
}
/**
* @description Fires event "io:success" and creates, fires a
* transaction-specific "success" event, if config.on.success is
* defined.
*
* @method _ioSuccess
* @private
* @static
* @param {object} o - transaction object.
* @param {object} c - configuration object for the transaction.
*
* @return void
*/
function _ioSuccess(o, c) {
// Set default value of argument c, property "on" to Object if
// the property is null or undefined.
if (fn) {
//Decode the response from IO.swf
}
}
_ioEnd(o, c);
}
/**
* @description Fires event "io:failure" and creates, fires a
* transaction-specific "failure" event, if config.on.failure is
* defined.
*
* @method _ioFailure
* @private
* @static
* @param {object} o - transaction object.
* @param {object} c - configuration object for the transaction.
*
* @return void
*/
function _ioFailure(o, c) {
r, event;
// Set default value of argument c, property "on" to Object if
// the property is null or undefined.
if (fn) {
//Decode the response from IO.swf
}
}
_ioEnd(o, c);
}
/**
* @description Fires event "io:end" and creates, fires a
* transaction-specific "end" event, if config.on.end is
* defined.
*
* @method _ioEnd
* @private
* @static
* @param {object} o - transaction object.
* @param {object} c - configuration object for the transaction.
*
* @return void
*/
function _ioEnd(o, c) {
// Set default value of argument c, property "on" to Object if
// the property is null or undefined.
if (fn) {
delete m[o.id];
}
}
}
/**
* @description Terminates a transaction due to an explicit abort or
* timeout.
*
* @method _ioCancel
* @private
* @static
* @param {object} o - Transaction object generated by _create().
* @param {object} c - Configuration object passed to YUI.io().
* @param {string} s - Identifies timed out or aborted transaction.
*
* @return void
*/
function _ioCancel(o, s) {
if (o && o.c) {
o.status = s;
o.c.abort();
}
}
/**
* @description Determines if a cross-domain transaction is still
* in progress.
*
* @method _isInProgress
* @private
* @static
* @param {object} o - Transaction object generated by _create().
*
* @return boolean
*/
function _isInProgress(o) {
return o.c.isInProgress(o.id);
}
function _response(s) {
}
/**
* @description Method that increments _transactionId for each transaction.
*
* @method _id
* @private
* @static
* @return int
*/
function _id() {
var id = transactionId;
return id;
}
/**
* @description Method that creates a unique transaction object for each
* request.
*
* @method _create
* @private
* @static
* @param {number} s - URI or root data.
* @param {number} c - configuration object
* @return object
*/
function _create(i, c) {
var o = {};
if (c.xdr) {
}
o.c = {};
}
else {
o.c = _xhr();
}
return o;
};
/**
* @description Method that creates the XMLHttpRequest transport
*
* @method _xhr
* @private
* @static
* @return object
*/
function _xhr() {
}
/**
* @description Method that concatenates string data for HTTP GET transactions.
*
* @method _concat
* @private
* @static
* @param {string} s - URI or root data.
* @param {string} d - data to be concatenated onto URI.
* @return int
*/
function _concat(s, d) {
return s;
}
/**
* @description Method that stores default client headers for all transactions.
* If a label is passed with no value argument, the header will be deleted.
*
* @method _setHeader
* @private
* @static
* @param {string} l - HTTP header
* @param {string} v - HTTP header value
* @return int
*/
function _setHeader(l, v) {
if (v) {
_headers[l] = v;
}
else {
delete _headers[l];
}
}
/**
* @description Method that sets all HTTP headers to be sent in a transaction.
*
* @method _setHeaders
* @private
* @static
* @param {object} o - XHR instance for the specific transaction.
* @param {object} h - HTTP headers for the specific transaction, as defined
* in the configuration object passed to YUI.io().
* @return void
*/
function _setHeaders(o, h) {
var p;
for (p in _headers) {
if (_headers.hasOwnProperty(p)) {
if (h[p]) {
// Configuration headers will supersede IO preset headers,
// if headers match.
break;
}
else {
h[p] = _headers[p];
}
}
}
for (p in h) {
if (h.hasOwnProperty(p)) {
o.setRequestHeader(p, h[p]);
}
}
}
}
/**
* @description Method that sends the transaction request.
*
* @method _async
* @private
* @static
* @param {object} o - Transaction object generated by _create().
* @param {string} d - Transaction data.
* @param {object} c - Configuration object passed to YUI.io().
* @return void
*/
function _async(o, d, c) {
o.c.send(d);
}
/**
* @description Starts timeout count if the configuration object
* has a defined timeout property.
*
* @method _startTimeout
* @private
* @static
* @param {object} o - Transaction object generated by _create().
* @param {object} c - Configuration object passed to YUI.io().
* @return void
*/
function _startTimeout(o, timeout) {
}
/**
* @description Clears the timeout interval started by _startTimeout().
*
* @method _clearTimeout
* @private
* @static
* @param {number} id - Transaction id.
* @return void
*/
function _clearTimeout(id) {
}
/**
* @description Event handler bound to onreadystatechange.
*
* @method _readyState
* @private
* @static
* @param {object} o - Transaction object generated by _create().
* @param {object} c - Configuration object passed to YUI.io().
* @return void
*/
function _readyState(o, c) {
if (o.c.readyState === 4) {
if (c.timeout) {
_clearTimeout(o.id);
}
w.setTimeout(
function() {
_ioComplete(o, c);
_handleResponse(o, c);
}, 0);
}
}
/**
* @description 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.
*
* @method _handleResponse
* @private
* @static
* @param {object} o - Transaction object generated by _create().
* @param {object} c - Configuration object passed to io().
* @return void
*/
function _handleResponse(o, c) {
var status;
try{
}
else {
status = 0;
}
}
catch(e1) {
status = 0;
}
// IE reports HTTP 204 as HTTP 1223.
// But, the response data are still available.
_ioSuccess(o, c);
}
else {
_ioFailure(o, c);
}
}
function _destroy(o, isTransport) {
// IE, when using XMLHttpRequest as an ActiveX Object, will throw
// a "Type Mismatch" error if the event handler is set to "null".
if(w.XMLHttpRequest && !isTransport) {
if (o.c) {
o.c.onreadystatechange = null;
}
}
o.c = null;
o = null;
}
//--------------------------------------
// Begin public interface definition
//--------------------------------------
/**
* @description 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().
*
* @method header
* @public
* @static
* @param {string} l - HTTP header
* @param {string} v - HTTP header value
* @return int
*/
/**
* @description Method for requesting a transaction. This
* is the interface for _io().
*
* @method io
* @public
* @static
* @param {string} uri - qualified path to transaction resource.
* @param {object} c - configuration object for the transaction.
* @return object
*/
}, '@VERSION@' );
/**
* Extends the IO base class to enable HTML form data serialization, when specified
* in the transaction's configuration object.
* @module io
* @submodule io-form
*/
/**
* @description Method to enumerate through an HTML form's elements collection
* and return a string comprised of key-value pairs.
*
* @method _serialize
* @private
* @static
* @param {object} o - YUI form node or HTML form id.
* @return string
*/
_serialize: function(o) {
var eUC = encodeURIComponent,
data = [],
useDf = o.useDisabled || false,
item = 0,
if (!id) {
}
// Iterate over the form elements collection to construct the
// label-value pairs.
e = f.elements[i];
d = e.disabled;
n = e.name;
if ((useDf) ? n : (n && !d)) {
n = encodeURIComponent(n) + '=';
v = encodeURIComponent(e.value);
switch (e.type) {
// Safari, Opera, FF all default options.value from .text if
// value attribute not specified in markup
case 'select-one':
if (e.selectedIndex > -1) {
o = e.options[e.selectedIndex];
}
break;
case 'select-multiple':
if (e.selectedIndex > -1) {
o = e.options[j];
if (o.selected) {
}
}
}
break;
case 'radio':
case 'checkbox':
if(e.checked){
}
break;
case 'file':
// stub case as XMLHttpRequest will only send the file path as a string.
case undefined:
// stub case for fieldset element which returns undefined.
case 'reset':
// stub case for input type reset button.
case 'button':
// stub case for input type button elements.
break;
case 'submit':
default:
}
}
}
}
}, true);
/**
* Extends the IO base class to provide an alternate, Flash transport, for making
* cross-domain requests.
* @module io
* @submodule io-xdr
*/
/**
* @event io:xdrReady
* @description This event is fired by YUI.io when the specified transport is
* ready for use.
* @type Event Custom
*/
var E_XDR_READY = 'io:xdrReady';
/**
* @description Method that creates the Flash transport swf.
*
* @method _swf
* @private
* @static
* @param {string} uri - location of IO.swf.
* @param {string} yid - YUI instance id.
* @return void
*/
var XDR_SWF = '<object id="yuiIoSwf" type="application/x-shockwave-flash" data="' +
uri + '" width="0" height="0">' +
'<param name="allowScriptAccess" value="sameDomain">' +
'</object>';
}
/**
* @description Map of IO transports.
*
* @property _transport
* @private
* @static
* @type object
*/
_transport: {},
/**
* @description Object that stores callback handlers for cross-domain requests
* when using Flash as the transport.
*
* @property _fn
* @private
* @static
* @type object
*/
_fn: {},
/**
* @description Method for accessing the transport's interface for making a
* cross-domain transaction.
*
* @method _xdr
* @private
* @static
* @param {string} uri - qualified path to transaction resource.
* @param {object} o - Transaction object generated by _create() in io-base.
* @param {object} c - configuration object for the transaction.
* @return object
*/
if (c.on) {
}
return o;
},
/**
* @description Fires event "io:xdrReady"
*
* @method xdrReady
* @private
* @static
* @param {number} id - transaction id
* @param {object} c - configuration object for the transaction.
*
* @return void
*/
},
/**
* @description Method to initialize the desired transport.
*
* @method transport
* @public
* @static
* @param {object} o - object of transport configurations.
* @return void
*/
transport: function(o) {
switch (o.id) {
case 'flash':
break;
}
}
});
/**
* Extends the IO base class to enable file uploads, with HTML forms,
* using an iframe as the transport medium.
* @module io
* @submodule io-upload-iframe
*/
/**
* @description Parses the POST data object and creates hidden form elements
* for each key-value, and appends them to the HTML form object.
* @method appendData
* @private
* @static
* @param {object} d The key-value hash map.
* @return {array} e Array of created fields.
*/
function _addData(f, d) {
var e = [],
p, i;
for (p in d) {
if (d.hasOwnProperty(d, p)) {
e[i].type = 'hidden';
e[i].name = p;
e[i].value = d[p].
f.appendChild(e[i]);
}
}
return e;
}
function _removeData(f, e) {
var i, l;
if (e && e.length > 0) {
for(i = 0, l = e.length; i < l; i++){
f.removeChild(e[i]);
}
}
}
function _create(o, c) {
cfg = {
position: 'absolute',
top: '-1000px',
left: '-1000px'
};
// Bind the onload handler to the iframe to detect the file upload response.
}
// Create the upload callback handler that fires when the iframe
// receives the load event. Subsequently, the event handler is detached
// and the iframe removed from the document.
function _handle(o, c) {
var p,
if (c.timeout) {
_clearTimeout(o.id);
}
// will wrap the response string with <pre></pre>.
p = b.query('pre:first-child');
// The transaction is complete, so call _destroy to remove
// the event listener bound to the iframe transport, and then
// destroy the iframe.
}
/**
* @description Starts timeout count if the configuration object
* has a defined timeout property.
*
* @method _startTimeout
* @private
* @static
* @param {object} o Transaction object generated by _create().
* @param {object} c Configuration object passed to YUI.io().
* @return void
*/
function _startTimeout(o, c) {
}
/**
* @description Clears the timeout interval started by _startTimeout().
*
* @method _clearTimeout
* @private
* @static
* @param {number} id - Transaction id.
* @return void
*/
function _clearTimeout(id) {
}
}
/**
* @description Uploads HTML form, inclusive of files/attachments, using the
* iframe created in createFrame to facilitate the transaction.
* @method _upload
* @private
* @static
* @param {o} o The transaction object
* @param {object} uri Qualified path to transaction resource.
* @param {object} c Configuration object for the transaction.
* @return {void}
*/
_create(o, c);
// Track original HTML form attribute values.
attr = {
};
// Initialize the HTML form properties in case they are
// not defined in the HTML form.
f.setAttribute((Y.UA.ie && !document.documentMode) ? 'encoding' : 'enctype', 'multipart/form-data');
if (c.data) {
}
// Start polling if a callback is present and the timeout
// property has been defined.
if (c.timeout) {
_startTimeout(o, c);
}
// Start file upload.
f.submit();
if (c.data) {
_removeData(f, fields);
}
// Restore HTML form attributes to their original
// values prior to file upload.
for (p in attr) {
if (attr[p]) {
f.setAttribute(p, f[prop]);
}
else {
f.removeAttribute(p);
}
}
}
}
});
/**
* Extends the IO base class to implement Queue for synchronous
* transaction processing.
* @module io
* @submodule io-queue
*/
/**
* @description Array of transactions queued for processing
*
* @property _yQ
* @private
* @static
* @type Object
*/
/**
* @description Reference to "io:complete" event handler.
*
* @property _e
* @private
* @static
* @type Object
*/
_e,
/**
* @description 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.
*
* @property _qState
* @private
* @static
* @type int
*/
_qState = 1;
/**
* @description Method for requesting a transaction, and queueing the
* request before it is sent to the resource.
*
* @method _queue
* @private
* @static
* @return Object
*/
if (_qState === 1) {
_shift();
}
return o;
}
/**
* @description Method Process the first transaction from the
* queue in FIFO order.
*
* @method _shift
* @private
* @static
* @return void
*/
function _shift() {
_qState = 0;
}
/**
* @description Method for promoting a transaction to the top of the queue.
*
* @method _unshift
* @private
* @static
* @return void
*/
function _unshift(o) {
}
_qState = 1;
_shift();
}
}
/**
* @description Method for removing a specific, pending transaction from
* the queue.
*
* @method _remove
* @private
* @static
* @return void
*/
function _remove(o) {
}
function _start() {
_qState = 1;
_shift();
}
}
/**
* @description 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".
*
* @method _stop
* @private
* @static
* @return void
*/
function _stop() {
_qState = 0;
};
/**
* @description Method to query the current size of the queue.
*
* @method _size
* @private
* @static
* @return int
*/
function _size() {
};
/**
* @description Method to query the current size of the queue, or to
* set a maximum queue size. This is the interface for _size().
*
* @method size
* @public
* @static
* @param {number} i - Specified maximum size of queue.
* @return number
*/
/**
* @description 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().
*
* @method start
* @public
* @static
* @return void
*/
/**
* @description 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().
*
* @method stop
* @public
* @static
* @return void
*/
/**
* @description Method for promoting a transaction to the top of the queue.
* This is the interface for _unshift().
*
* @method promote
* @public
* @static
* @param {Object} o - Reference to queued transaction.
* @return void
*/
/**
* @description Method for removing a specific, pending transaction from
* the queue. This is the interface for _purge().
*
* @method purge
* @public
* @static
* @param {Object} o - Reference to queued transaction.
* @return void
*/
}, true);
YUI.add('io', function(Y){}, '@VERSION@' ,{use:['io-base', 'io-form', 'io-xdr', 'io-upload-iframe', 'io-queue']});