YAHOO.util.Connect =
{
_msxml_progid:[
'Microsoft.XMLHTTP',
'MSXML2.XMLHTTP.3.0',
'MSXML2.XMLHTTP'
],
_http_headers:{},
_has_http_headers:false,
_use_default_post_header:true,
_default_post_header:'application/x-www-form-urlencoded; charset=UTF-8',
_default_form_header:'application/x-www-form-urlencoded',
_use_default_xhr_header:true,
_default_xhr_header:'XMLHttpRequest',
_has_default_headers:true,
_default_headers:{},
_isFormSubmit:false,
_isFileUpload:false,
_formNode:null,
_sFormData:null,
_poll:{},
_timeOut:{},
_polling_interval:50,
_transaction_id:0,
_submitElementValue:null,
_hasSubmitListener:(function()
{
if(YAHOO.util.Event){
YAHOO.util.Event.addListener(
document,
'click',
function(e){
try
{
var obj = YAHOO.util.Event.getTarget(e);
if(obj.type.toLowerCase() == 'submit'){
YAHOO.util.Connect._submitElementValue = encodeURIComponent(obj.name) + "=" + encodeURIComponent(obj.value);
}
}
catch(e){}
});
return true;
}
return false;
})(),
/**
* @description Custom event that fires at the start of a transaction
* @property startEvent
* @private
* @static
* @type CustomEvent
*/
startEvent: new YAHOO.util.CustomEvent('start'),
/**
* @description Custom event that fires when a transaction response has completed.
* @property completeEvent
* @private
* @static
* @type CustomEvent
*/
completeEvent: new YAHOO.util.CustomEvent('complete'),
/**
* @description Custom event that fires when handleTransactionResponse() determines a
* response in the HTTP 2xx range.
* @property successEvent
* @private
* @static
* @type CustomEvent
*/
successEvent: new YAHOO.util.CustomEvent('success'),
/**
* @description Custom event that fires when handleTransactionResponse() determines a
* response in the HTTP 4xx/5xx range.
* @property failureEvent
* @private
* @static
* @type CustomEvent
*/
failureEvent: new YAHOO.util.CustomEvent('failure'),
/**
* @description Custom event that fires when handleTransactionResponse() determines a
* response in the HTTP 4xx/5xx range.
* @property failureEvent
* @private
* @static
* @type CustomEvent
*/
uploadEvent: new YAHOO.util.CustomEvent('upload'),
/**
* @description Custom event that fires when a transaction is successfully aborted.
* @property abortEvent
* @private
* @static
* @type CustomEvent
*/
abortEvent: new YAHOO.util.CustomEvent('abort'),
/**
* @description A reference table that maps callback custom events members to its specific
* event name.
* @property _customEvents
* @private
* @static
* @type object
*/
_customEvents:
{
onStart:['startEvent', 'start'],
onComplete:['completeEvent', 'complete'],
onSuccess:['successEvent', 'success'],
onFailure:['failureEvent', 'failure'],
onUpload:['uploadEvent', 'upload'],
onAbort:['abortEvent', 'abort']
},
/**
* @description Member to add an ActiveX id to the existing xml_progid array.
* In the event(unlikely) a new ActiveX id is introduced, it can be added
* without internal code modifications.
* @method setProgId
* @public
* @static
* @param {string} id The ActiveX id to be added to initialize the XHR object.
* @return void
*/
setProgId:function(id)
{
this._msxml_progid.unshift(id);
},
/**
* @description Member to override the default POST header.
* @method setDefaultPostHeader
* @public
* @static
* @param {boolean} b Set and use default header - true or false .
* @return void
*/
setDefaultPostHeader:function(b)
{
if(typeof b == 'string'){
this._default_post_header = b;
}
else if(typeof b == 'boolean'){
this._use_default_post_header = b;
}
},
/**
* @description Member to override the default transaction header..
* @method setDefaultXhrHeader
* @public
* @static
* @param {boolean} b Set and use default header - true or false .
* @return void
*/
setDefaultXhrHeader:function(b)
{
if(typeof b == 'string'){
this._default_xhr_header = b;
}
else{
this._use_default_xhr_header = b;
}
},
/**
* @description Member to modify the default polling interval.
* @method setPollingInterval
* @public
* @static
* @param {int} i The polling interval in milliseconds.
* @return void
*/
setPollingInterval:function(i)
{
if(typeof i == 'number' && isFinite(i)){
this._polling_interval = i;
}
},
/**
* @description Instantiates a XMLHttpRequest object and returns an object with two properties:
* the XMLHttpRequest instance and the transaction id.
* @method createXhrObject
* @private
* @static
* @param {int} transactionId Property containing the transaction id for this transaction.
* @return object
*/
createXhrObject:function(transactionId)
{
var obj,http;
try
{
// Instantiates XMLHttpRequest in non-IE browsers and assigns to http.
http = new XMLHttpRequest();
// Object literal with http and tId properties
obj = { conn:http, tId:transactionId };
}
catch(e)
{
for(var i=0; i<this._msxml_progid.length; ++i){
try
{
// Instantiates XMLHttpRequest for IE and assign to http
http = new ActiveXObject(this._msxml_progid[i]);
// Object literal with conn and tId properties
obj = { conn:http, tId:transactionId };
break;
}
catch(e){}
}
}
finally
{
return obj;
}
},
/**
* @description This method is called by asyncRequest to create a
* valid connection object for the transaction. It also passes a
* transaction id and increments the transaction id counter.
* @method getConnectionObject
* @private
* @static
* @return {object}
*/
getConnectionObject:function(isFileUpload)
{
var o;
var tId = this._transaction_id;
try
{
if(!isFileUpload){
o = this.createXhrObject(tId);
}
else{
o = {};
o.tId = tId;
o.isUpload = true;
}
if(o){
this._transaction_id++;
}
}
catch(e){}
finally
{
return o;
}
},
/**
* @description Method for initiating an asynchronous request via the XHR object.
* @method asyncRequest
* @public
* @static
* @param {string} method HTTP transaction method
* @param {string} uri Fully qualified path of resource
* @param {callback} callback User-defined callback function or object
* @param {string} postData POST body
* @return {object} Returns the connection object
*/
asyncRequest:function(method, uri, callback, postData)
{
var o = (this._isFileUpload)?this.getConnectionObject(true):this.getConnectionObject();
if(!o){
return null;
}
else{
// Intialize any transaction-specific custom events, if provided.
if(callback && callback.customevents){
this.initCustomEvents(o, callback);
}
if(this._isFormSubmit){
if(this._isFileUpload){
this.uploadFile(o, callback, uri, postData);
return o;
}
// If the specified HTTP method is GET, setForm() will return an
// encoded string that is concatenated to the uri to
// create a querystring.
if(method.toUpperCase() == 'GET'){
if(this._sFormData.length !== 0){
// If the URI already contains a querystring, append an ampersand
// and then concatenate _sFormData to the URI.
uri += ((uri.indexOf('?') == -1)?'?':'&') + this._sFormData;
}
else{
uri += "?" + this._sFormData;
}
}
else if(method.toUpperCase() == 'POST'){
// If POST data exist in addition to the HTML form data,
// it will be concatenated to the form data.
postData = postData?this._sFormData + "&" + postData:this._sFormData;
}
}
o.conn.open(method, uri, true);
// Each transaction will automatically include a custom header of
// "X-Requested-With: XMLHttpRequest" to identify the request as
// having originated from Connection Manager.
if(this._use_default_xhr_header){
if(!this._default_headers['X-Requested-With']){
this.initHeader('X-Requested-With', this._default_xhr_header, true);
}
}
if(this._isFormSubmit == false && this._use_default_post_header){
this.initHeader('Content-Type', this._default_post_header);
}
if(this._has_default_headers || this._has_http_headers){
this.setHeader(o);
}
this.handleReadyState(o, callback);
o.conn.send(postData || null);
// Fire global custom event -- startEvent
this.startEvent.fire(o);
if(o.startEvent){
// Fire transaction custom event -- startEvent
o.startEvent.fire(o);
}
return o;
}
},
/**
* @description This method creates and subscribes custom events,
* specific to each transaction
* @method initCustomEvents
* @private
* @static
* @param {object} o The connection object
* @param {callback} callback The user-defined callback object
* @return {void}
*/
initCustomEvents:function(o, callback)
{
// Enumerate through callback.customevents members and bind/subscribe
// events that match in the _customEvents table.
for(var prop in callback.customevents){
if(this._customEvents[prop][0]){
// Create the custom event
o[this._customEvents[prop][0]] = new YAHOO.util.CustomEvent(this._customEvents[prop][1], (callback.scope)?callback.scope:null);
// Subscribe the custom event
o[this._customEvents[prop][0]].subscribe(callback.customevents[prop]);
}
}
},
/**
* @description This method serves as a timer that polls the XHR object's readyState
* property during a transaction, instead of binding a callback to the
* onreadystatechange event. Upon readyState 4, handleTransactionResponse
* will process the response, and the timer will be cleared.
* @method handleReadyState
* @private
* @static
* @param {object} o The connection object
* @param {callback} callback The user-defined callback object
* @return {void}
*/
handleReadyState:function(o, callback)
{
var oConn = this;
if(callback && callback.timeout){
this._timeOut[o.tId] = window.setTimeout(function(){ oConn.abort(o, callback, true); }, callback.timeout);
}
this._poll[o.tId] = window.setInterval(
function(){
if(o.conn && o.conn.readyState === 4){
window.clearInterval(oConn._poll[o.tId]);
delete oConn._poll[o.tId];
if(callback && callback.timeout){
window.clearTimeout(oConn._timeOut[o.tId]);
delete oConn._timeOut[o.tId];
}
oConn.completeEvent.fire(o);
if(o.completeEvent){
o.completeEvent.fire(o);
}
oConn.handleTransactionResponse(o, callback);
}
}
,this._polling_interval);
},
handleTransactionResponse:function(o, callback, isAbort)
{
var httpStatus, responseObject;
try
{
if(o.conn.status !== undefined && o.conn.status !== 0){
httpStatus = o.conn.status;
}
else{
httpStatus = 13030;
}
}
catch(e){
httpStatus = 13030;
}
if(httpStatus >= 200 && httpStatus < 300 || httpStatus === 1223){
responseObject = this.createResponseObject(o, (callback && callback.argument)?callback.argument:undefined);
if(callback){
if(callback.success){
if(!callback.scope){
callback.success(responseObject);
}
else{
callback.success.apply(callback.scope, [responseObject]);
}
}
}
this.successEvent.fire(responseObject);
if(o.successEvent){
o.successEvent.fire(responseObject);
}
}
else{
switch(httpStatus){
case 12002:
case 12029:
case 12030:
case 12031:
case 12152:
case 13030:
responseObject = this.createExceptionObject(o.tId, (callback && callback.argument)?callback.argument:undefined, (isAbort?isAbort:false));
if(callback){
if(callback.failure){
if(!callback.scope){
callback.failure(responseObject);
}
else{
callback.failure.apply(callback.scope, [responseObject]);
}
}
}
break;
default:
responseObject = this.createResponseObject(o, (callback && callback.argument)?callback.argument:undefined);
if(callback){
if(callback.failure){
if(!callback.scope){
callback.failure(responseObject);
}
else{
callback.failure.apply(callback.scope, [responseObject]);
}
}
}
}
this.failureEvent.fire(responseObject);
if(o.failureEvent){
o.failureEvent.fire(responseObject);
}
}
this.releaseObject(o);
responseObject = null;
},
createResponseObject:function(o, callbackArg)
{
var obj = {};
var headerObj = {};
try
{
var headerStr = o.conn.getAllResponseHeaders();
var header = headerStr.split('\n');
for(var i=0; i<header.length; i++){
var delimitPos = header[i].indexOf(':');
if(delimitPos != -1){
headerObj[header[i].substring(0,delimitPos)] = header[i].substring(delimitPos+2);
}
}
}
catch(e){}
obj.tId = o.tId;
obj.status = (o.conn.status == 1223)?204:o.conn.status;
obj.statusText = (o.conn.status == 1223)?"No Content":o.conn.statusText;
obj.getResponseHeader = headerObj;
obj.getAllResponseHeaders = headerStr;
obj.responseText = o.conn.responseText;
obj.responseXML = o.conn.responseXML;
if(typeof callbackArg !== undefined){
obj.argument = callbackArg;
}
return obj;
},
createExceptionObject:function(tId, callbackArg, isAbort)
{
var COMM_CODE = 0;
var COMM_ERROR = 'communication failure';
var ABORT_CODE = -1;
var ABORT_ERROR = 'transaction aborted';
var obj = {};
obj.tId = tId;
if(isAbort){
obj.status = ABORT_CODE;
obj.statusText = ABORT_ERROR;
}
else{
obj.status = COMM_CODE;
obj.statusText = COMM_ERROR;
}
if(callbackArg){
obj.argument = callbackArg;
}
return obj;
},
initHeader:function(label, value, isDefault)
{
var headerObj = (isDefault)?this._default_headers:this._http_headers;
headerObj[label] = value;
if(isDefault){
this._has_default_headers = true;
}
else{
this._has_http_headers = true;
}
},
setHeader:function(o)
{
if(this._has_default_headers){
for(var prop in this._default_headers){
if(YAHOO.lang.hasOwnProperty(this._default_headers, prop)){
o.conn.setRequestHeader(prop, this._default_headers[prop]);
}
}
}
if(this._has_http_headers){
for(var prop in this._http_headers){
if(YAHOO.lang.hasOwnProperty(this._http_headers, prop)){
o.conn.setRequestHeader(prop, this._http_headers[prop]);
}
}
delete this._http_headers;
this._http_headers = {};
this._has_http_headers = false;
}
},
resetDefaultHeaders:function(){
delete this._default_headers;
this._default_headers = {};
this._has_default_headers = false;
},
setForm:function(formId, isUpload, secureUri)
{
this.resetFormState();
var oForm;
if(typeof formId == 'string'){
oForm = (document.getElementById(formId) || document.forms[formId]);
}
else if(typeof formId == 'object'){
oForm = formId;
}
else{
return;
}
if(isUpload){
var io = this.createFrame(secureUri?secureUri:null);
this._isFormSubmit = true;
this._isFileUpload = true;
this._formNode = oForm;
return;
}
var oElement, oName, oValue, oDisabled;
var hasSubmit = false;
for (var i=0; i<oForm.elements.length; i++){
oElement = oForm.elements[i];
oDisabled = oForm.elements[i].disabled;
oName = oForm.elements[i].name;
oValue = oForm.elements[i].value;
if(!oDisabled && oName)
{
switch(oElement.type)
{
case 'select-one':
case 'select-multiple':
for(var j=0; j<oElement.options.length; j++){
if(oElement.options[j].selected){
if(window.ActiveXObject){
this._sFormData += encodeURIComponent(oName) + '=' + encodeURIComponent(oElement.options[j].attributes['value'].specified?oElement.options[j].value:oElement.options[j].text) + '&';
}
else{
this._sFormData += encodeURIComponent(oName) + '=' + encodeURIComponent(oElement.options[j].hasAttribute('value')?oElement.options[j].value:oElement.options[j].text) + '&';
}
}
}
break;
case 'radio':
case 'checkbox':
if(oElement.checked){
this._sFormData += encodeURIComponent(oName) + '=' + encodeURIComponent(oValue) + '&';
}
break;
case 'file':
case undefined:
case 'reset':
case 'button':
break;
case 'submit':
if(hasSubmit === false){
if(this._hasSubmitListener && this._submitElementValue){
this._sFormData += this._submitElementValue + '&';
}
else{
this._sFormData += encodeURIComponent(oName) + '=' + encodeURIComponent(oValue) + '&';
}
hasSubmit = true;
}
break;
default:
this._sFormData += encodeURIComponent(oName) + '=' + encodeURIComponent(oValue) + '&';
}
}
}
this._isFormSubmit = true;
this._sFormData = this._sFormData.substr(0, this._sFormData.length - 1);
this.initHeader('Content-Type', this._default_form_header);
return this._sFormData;
},
resetFormState:function(){
this._isFormSubmit = false;
this._isFileUpload = false;
this._formNode = null;
this._sFormData = "";
},
createFrame:function(secureUri){
var frameId = 'yuiIO' + this._transaction_id;
var io;
if(window.ActiveXObject){
io = document.createElement('<iframe id="' + frameId + '" name="' + frameId + '" />');
if(typeof secureUri == 'boolean'){
io.src = 'javascript:false';
}
else if(typeof secureURI == 'string'){
io.src = secureUri;
}
}
else{
io = document.createElement('iframe');
io.id = frameId;
io.name = frameId;
}
io.style.position = 'absolute';
io.style.top = '-1000px';
io.style.left = '-1000px';
document.body.appendChild(io);
},
appendPostData:function(postData)
{
var formElements = [];
var postMessage = postData.split('&');
for(var i=0; i < postMessage.length; i++){
var delimitPos = postMessage[i].indexOf('=');
if(delimitPos != -1){
formElements[i] = document.createElement('input');
formElements[i].type = 'hidden';
formElements[i].name = postMessage[i].substring(0,delimitPos);
formElements[i].value = postMessage[i].substring(delimitPos+1);
this._formNode.appendChild(formElements[i]);
}
}
return formElements;
},
uploadFile:function(o, callback, uri, postData){
var frameId = 'yuiIO' + o.tId;
var uploadEncoding = 'multipart/form-data';
var io = document.getElementById(frameId);
var oConn = this;
var rawFormAttributes =
{
action:this._formNode.getAttribute('action'),
method:this._formNode.getAttribute('method'),
target:this._formNode.getAttribute('target')
};
this._formNode.setAttribute('action', uri);
this._formNode.setAttribute('method', 'POST');
this._formNode.setAttribute('target', frameId);
if(this._formNode.encoding){
this._formNode.setAttribute('encoding', uploadEncoding);
}
else{
this._formNode.setAttribute('enctype', uploadEncoding);
}
if(postData){
var oElements = this.appendPostData(postData);
}
this._formNode.submit();
this.startEvent.fire(o);
if(o.startEvent){
o.startEvent.fire(o);
}
if(callback && callback.timeout){
this._timeOut[o.tId] = window.setTimeout(function(){ oConn.abort(o, callback, true); }, callback.timeout);
}
if(oElements && oElements.length > 0){
for(var i=0; i < oElements.length; i++){
this._formNode.removeChild(oElements[i]);
}
}
for(var prop in rawFormAttributes){
if(YAHOO.lang.hasOwnProperty(rawFormAttributes, prop)){
if(rawFormAttributes[prop]){
this._formNode.setAttribute(prop, rawFormAttributes[prop]);
}
else{
this._formNode.removeAttribute(prop);
}
}
}
this.resetFormState();
var uploadCallback = function()
{
if(callback && callback.timeout){
window.clearTimeout(oConn._timeOut[o.tId]);
delete oConn._timeOut[o.tId];
}
oConn.completeEvent.fire(o);
if(o.completeEvent){
o.completeEvent.fire(o);
}
var obj = {};
obj.tId = o.tId;
obj.argument = callback.argument;
try
{
obj.responseText = io.contentWindow.document.body?io.contentWindow.document.body.innerHTML:io.contentWindow.document.documentElement.textContent;
obj.responseXML = io.contentWindow.document.XMLDocument?io.contentWindow.document.XMLDocument:io.contentWindow.document;
}
catch(e){}
if(callback && callback.upload){
if(!callback.scope){
callback.upload(obj);
}
else{
callback.upload.apply(callback.scope, [obj]);
}
}
oConn.uploadEvent.fire(obj);
if(o.uploadEvent){
o.uploadEvent.fire(obj);
}
YAHOO.util.Event.removeListener(io, "load", uploadCallback);
setTimeout(
function(){
document.body.removeChild(io);
oConn.releaseObject(o);
}, 100);
};
YAHOO.util.Event.addListener(io, "load", uploadCallback);
},
abort:function(o, callback, isTimeout)
{
var abortStatus;
if(o.conn){
if(this.isCallInProgress(o)){
o.conn.abort();
window.clearInterval(this._poll[o.tId]);
delete this._poll[o.tId];
if(isTimeout){
window.clearTimeout(this._timeOut[o.tId]);
delete this._timeOut[o.tId];
}
abortStatus = true;
}
}
else if(o.isUpload === true){
var frameId = 'yuiIO' + o.tId;
var io = document.getElementById(frameId);
if(io){
YAHOO.util.Event.removeListener(io, "load", uploadCallback);
document.body.removeChild(io);
if(isTimeout){
window.clearTimeout(this._timeOut[o.tId]);
delete this._timeOut[o.tId];
}
abortStatus = true;
}
}
else{
abortStatus = false;
}
if(abortStatus === true){
this.abortEvent.fire(o);
if(o.abortEvent){
o.abortEvent.fire(o);
}
this.handleTransactionResponse(o, callback, true);
}
return abortStatus;
},
isCallInProgress:function(o)
{
if(o && o.conn){
return o.conn.readyState !== 4 && o.conn.readyState !== 0;
}
else if(o && o.isUpload === true){
var frameId = 'yuiIO' + o.tId;
return document.getElementById(frameId)?true:false;
}
else{
return false;
}
},
releaseObject:function(o)
{
if(o.conn){
o.conn = null;
}
o = null;
}
};
YAHOO.register("connection", YAHOO.util.Connect, {version: "2.3.1", build: "541"});