/**
* @for YAHOO.util.Connect
*/
(function(){
var YCM = YAHOO.util.Connect,
YE = YAHOO.util.Event,
dM = document.documentMode ? document.documentMode : false;
/**
* @description Property modified by setForm() to determine if a file(s)
* upload is expected.
* @property _isFileUpload
* @private
* @static
* @type boolean
*/
YCM._isFileUpload = false;
/**
* @description Property modified by setForm() to set a reference to the HTML
* form node if the desired action is file upload.
* @property _formNode
* @private
* @static
* @type object
*/
YCM._formNode = null;
/**
* @description Property modified by setForm() to set the HTML form data
* for each transaction.
* @property _sFormData
* @private
* @static
* @type string
*/
YCM._sFormData = null;
/**
* @description Tracks the name-value pair of the "clicked" submit button if multiple submit
* buttons are present in an HTML form; and, if YAHOO.util.Event is available.
* @property _submitElementValue
* @private
* @static
* @type string
*/
YCM._submitElementValue = null;
/**
* @description Custom event that fires when handleTransactionResponse() determines a
* response in the HTTP 4xx/5xx range.
* @property failureEvent
* @private
* @static
* @type CustomEvent
*/
YCM.uploadEvent = new YAHOO.util.CustomEvent('upload');
/**
* @description Determines whether YAHOO.util.Event is available and returns true or false.
* If true, an event listener is bound at the document level to trap click events that
* resolve to a target type of "Submit". This listener will enable setForm() to determine
* the clicked "Submit" value in a multi-Submit button, HTML form.
* @property _hasSubmitListener
* @private
* @static
*/
YCM._hasSubmitListener = function() {
if(YE){
YE.addListener(
document,
'click',
function(e){
var obj = YE.getTarget(e),
name = obj.nodeName.toLowerCase();
if((name === 'input' || name === 'button') && (obj.type && obj.type.toLowerCase() == 'submit')){
YCM._submitElementValue = encodeURIComponent(obj.name) + "=" + encodeURIComponent(obj.value);
}
});
return true;
}
return false;
}();
/**
* @description This method assembles the form label and value pairs and
* constructs an encoded string.
* asyncRequest() will automatically initialize the transaction with a
* a HTTP header Content-Type of application/x-www-form-urlencoded.
* @method setForm
* @public
* @static
* @param {string || object} form id or name attribute, or form object.
* @param {boolean} optional enable file upload.
* @param {boolean} optional enable file upload over SSL in IE only.
* @return {string} string of the HTML form field name and value pairs..
*/
function _setForm(formId, isUpload, secureUri)
{
var oForm, oElement, oName, oValue, oDisabled,
hasSubmit = false,
data = [], item = 0,
i,len,j,jlen,opt;
this.resetFormState();
if(typeof formId == 'string'){
// Determine if the argument is a form id or a form name.
// Note form name usage is deprecated by supported
// here for legacy reasons.
oForm = (document.getElementById(formId) || document.forms[formId]);
}
else if(typeof formId == 'object'){
// Treat argument as an HTML form object.
oForm = formId;
}
else{
YAHOO.log('Unable to create form object ' + formId, 'warn', 'Connection');
return;
}
// If the isUpload argument is true, setForm will call createFrame to initialize
// an iframe as the form target.
//
// The argument secureURI is also required by IE in SSL environments
// where the secureURI string is a fully qualified HTTP path, used to set the source
// of the iframe, to a stub resource in the same domain.
if(isUpload){
// Create iframe in preparation for file upload.
this.createFrame(secureUri?secureUri:null);
// Set form reference and file upload properties to true.
this._isFormSubmit = true;
this._isFileUpload = true;
this._formNode = oForm;
return;
}
// Iterate over the form elements collection to construct the
// label-value pairs.
for (i=0,len=oForm.elements.length; i<len; ++i){
oElement = oForm.elements[i];
oDisabled = oElement.disabled;
oName = oElement.name;
// Do not submit fields that are disabled or
// do not have a name attribute value.
if(!oDisabled && oName)
{
oName = encodeURIComponent(oName)+'=';
oValue = encodeURIComponent(oElement.value);
switch(oElement.type)
{
// Safari, Opera, FF all default opt.value from .text if
// value attribute not specified in markup
case 'select-one':
if (oElement.selectedIndex > -1) {
opt = oElement.options[oElement.selectedIndex];
data[item++] = oName + encodeURIComponent(
(opt.attributes.value && opt.attributes.value.specified) ? opt.value : opt.text);
}
break;
case 'select-multiple':
if (oElement.selectedIndex > -1) {
for(j=oElement.selectedIndex, jlen=oElement.options.length; j<jlen; ++j){
opt = oElement.options[j];
if (opt.selected) {
data[item++] = oName + encodeURIComponent(
(opt.attributes.value && opt.attributes.value.specified) ? opt.value : opt.text);
}
}
}
break;
case 'radio':
case 'checkbox':
if(oElement.checked){
data[item++] = oName + oValue;
}
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':
if(hasSubmit === false){
if(this._hasSubmitListener && this._submitElementValue){
data[item++] = this._submitElementValue;
}
hasSubmit = true;
}
break;
default:
data[item++] = oName + oValue;
}
}
}
this._isFormSubmit = true;
this._sFormData = data.join('&');
YAHOO.log('Form initialized for transaction. HTML form POST message is: ' + this._sFormData, 'info', 'Connection');
this.initHeader('Content-Type', this._default_form_header);
YAHOO.log('Initialize header Content-Type to application/x-www-form-urlencoded for setForm() transaction.', 'info', 'Connection');
return this._sFormData;
}
/**
* @description Resets HTML form properties when an HTML form or HTML form
* with file upload transaction is sent.
* @method resetFormState
* @private
* @static
* @return {void}
*/
function _resetFormState(){
this._isFormSubmit = false;
this._isFileUpload = false;
this._formNode = null;
this._sFormData = "";
}
/**
* @description Creates an iframe to be used for form file uploads. It is remove from the
* document upon completion of the upload transaction.
* @method createFrame
* @private
* @static
* @param {string} optional qualified path of iframe resource for SSL in IE.
* @return {void}
*/
function _createFrame(secureUri){
// IE does not allow the setting of id and name attributes as object
// properties via createElement(). A different iframe creation
// pattern is required for IE.
var frameId = 'yuiIO' + this._transaction_id,
ie9 = (dM === 9) ? true : false,
io;
if(YAHOO.env.ua.ie && !ie9){
io = document.createElement('<iframe id="' + frameId + '" name="' + frameId + '" />');
// IE will throw a security exception in an SSL environment if the
// iframe source is undefined.
if(typeof secureUri == 'boolean'){
io.src = 'javascript:false';
}
}
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);
YAHOO.log('File upload iframe created. Id is:' + frameId, 'info', 'Connection');
}
/**
* @description Parses the POST data and creates hidden form elements
* for each key-value, and appends them to the HTML form object.
* @method appendPostData
* @private
* @static
* @param {string} postData The HTTP POST data
* @return {array} formElements Collection of hidden fields.
*/
function _appendPostData(postData){
var formElements = [],
postMessage = postData.split('&'),
i, delimitPos;
for(i=0; i < postMessage.length; i++){
delimitPos = postMessage[i].indexOf('=');
if(delimitPos != -1){
formElements[i] = document.createElement('input');
formElements[i].type = 'hidden';
formElements[i].name = decodeURIComponent(postMessage[i].substring(0,delimitPos));
formElements[i].value = decodeURIComponent(postMessage[i].substring(delimitPos+1));
this._formNode.appendChild(formElements[i]);
}
}
return formElements;
}
/**
* @description Uploads HTML form, inclusive of files/attachments, using the
* iframe created in createFrame to facilitate the transaction.
* @method uploadFile
* @private
* @static
* @param {int} id The transaction id.
* @param {object} callback User-defined callback object.
* @param {string} uri Fully qualified path of resource.
* @param {string} postData POST data to be submitted in addition to HTML form.
* @return {void}
*/
function _uploadFile(o, callback, uri, postData){
// Each iframe has an id prefix of "yuiIO" followed
// by the unique transaction id.
var frameId = 'yuiIO' + o.tId,
uploadEncoding = 'multipart/form-data',
io = document.getElementById(frameId),
ie8 = (dM >= 8) ? true : false,
oConn = this,
args = (callback && callback.argument)?callback.argument:null,
oElements,i,prop,obj, rawFormAttributes, uploadCallback;
// Track original HTML form attribute values.
rawFormAttributes = {
action:this._formNode.getAttribute('action'),
method:this._formNode.getAttribute('method'),
target:this._formNode.getAttribute('target')
};
// Initialize the HTML form properties in case they are
// not defined in the HTML form.
this._formNode.setAttribute('action', uri);
this._formNode.setAttribute('method', 'POST');
this._formNode.setAttribute('target', frameId);
if(YAHOO.env.ua.ie && !ie8){
// IE does not respect property enctype for HTML forms.
// Instead it uses the property - "encoding".
this._formNode.setAttribute('encoding', uploadEncoding);
}
else{
this._formNode.setAttribute('enctype', uploadEncoding);
}
if(postData){
oElements = this.appendPostData(postData);
}
// Start file upload.
this._formNode.submit();
// Fire global custom event -- startEvent
this.startEvent.fire(o, args);
if(o.startEvent){
// Fire transaction custom event -- startEvent
o.startEvent.fire(o, args);
}
// Start polling if a callback is present and the timeout
// property has been defined.
if(callback && callback.timeout){
this._timeOut[o.tId] = window.setTimeout(function(){ oConn.abort(o, callback, true); }, callback.timeout);
}
// Remove HTML elements created by appendPostData
if(oElements && oElements.length > 0){
for(i=0; i < oElements.length; i++){
this._formNode.removeChild(oElements[i]);
}
}
// Restore HTML form attributes to their original
// values prior to file upload.
for(prop in rawFormAttributes){
if(YAHOO.lang.hasOwnProperty(rawFormAttributes, prop)){
if(rawFormAttributes[prop]){
this._formNode.setAttribute(prop, rawFormAttributes[prop]);
}
else{
this._formNode.removeAttribute(prop);
}
}
}
// Reset HTML form state properties.
this.resetFormState();
// 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.
uploadCallback = function() {
var body, pre, text;
if(callback && callback.timeout){
window.clearTimeout(oConn._timeOut[o.tId]);
delete oConn._timeOut[o.tId];
}
// Fire global custom event -- completeEvent
oConn.completeEvent.fire(o, args);
if(o.completeEvent){
// Fire transaction custom event -- completeEvent
o.completeEvent.fire(o, args);
}
obj = {
tId : o.tId,
argument : args
};
try
{
body = io.contentWindow.document.getElementsByTagName('body')[0];
pre = io.contentWindow.document.getElementsByTagName('pre')[0];
if (body) {
if (pre) {
text = pre.textContent?pre.textContent:pre.innerText;
}
else {
text = body.textContent?body.textContent:body.innerText;
}
}
obj.responseText = text;
// responseText and responseXML will be populated with the same data from the iframe.
// Since the HTTP headers cannot be read from the iframe
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);
YAHOO.log('Upload callback.', 'info', 'Connection');
}
else{
callback.upload.apply(callback.scope, [obj]);
YAHOO.log('Upload callback with scope.', 'info', 'Connection');
}
}
// Fire global custom event -- uploadEvent
oConn.uploadEvent.fire(obj);
if(o.uploadEvent){
// Fire transaction custom event -- uploadEvent
o.uploadEvent.fire(obj);
}
YE.removeListener(io, "load", uploadCallback);
setTimeout(
function(){
document.body.removeChild(io);
oConn.releaseObject(o);
YAHOO.log('File upload iframe destroyed. Id is:' + frameId, 'info', 'Connection');
}, 100);
};
// Bind the onload handler to the iframe to detect the file upload response.
YE.addListener(io, "load", uploadCallback);
}
YCM.setForm = _setForm;
YCM.resetFormState = _resetFormState;
YCM.createFrame = _createFrame;
YCM.appendPostData = _appendPostData;
YCM.uploadFile = _uploadFile;
})();