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IFrame.js
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IFrame.js
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/*
* Copyright 2012 Amadeus s.a.s.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* Transport class for IFrame.
*/
Aria.classDefinition({
$classpath : "aria.core.transport.IFrame",
$singleton : true,
$statics : {
ERROR_DURING_SUBMIT : "An error occurred while submitting the form (form.submit() raised an exception)."
},
$prototype : {
/**
* Tells if the transport object is ready or requires an initialization phase
* @type Boolean
*/
isReady : true,
/**
* Map request ids to their original requests
* @type Object
*/
_requests : {},
/**
* Initialization function. Not needed because this transport is ready at creation time
*/
init : Aria.empty,
/**
* Perform a request.
* @param {aria.core.CfgBeans.IOAsyncRequestCfg} request Request object
* @param {aria.core.CfgBeans.Callback} callback Internal callback description
*/
request : function (request, callback) {
this._requests[request.id] = {
request : request,
cb : callback
};
// handle timeout
aria.core.IO.setTimeout(request.id, request.timeout, {
fn : this.onAbort,
scope : this,
args : [request]
});
this._createIFrame(request);
this._submitForm(request, callback);
},
/**
* Creates an iFrame to load the response of the request.
* @param {aria.core.CfgBeans.IOAsyncRequestCfg} request
* @protected
*/
_createIFrame : function (request) {
var iFrame;
var browser = aria.core.Browser;
var document = Aria.$frameworkWindow.document;
// Issue when using document.createElement("iframe") in IE7
if (browser.isIE7 || browser.isIE6) {
var container = document.createElement("div");
container.innerHTML = ['<iframe style="display:none" src="',
aria.core.DownloadMgr.resolveURL("aria/core/transport/iframeSource.txt"), '" id="xIFrame',
request.id, '" name="xIFrame', request.id, '"></iframe>'].join('');
document.body.appendChild(container);
iFrame = document.getElementById("xIFrame" + request.id);
request.iFrameContainer = container;
} else {
iFrame = document.createElement("iframe");
iFrame.src = aria.core.DownloadMgr.resolveURL("aria/core/transport/iframeSource.txt");
iFrame.id = iFrame.name = "xIFrame" + request.id;
iFrame.style.cssText = "display:none";
document.body.appendChild(iFrame);
}
request.iFrame = iFrame;
// Event handlers
iFrame.onload = iFrame.onreadystatechange = this._iFrameReady;
},
/**
* Updates the form to target the iframe then calls the forms submit method.
* @param {aria.core.CfgBeans.IOAsyncRequestCfg} request
* @param {Object} callback Internal callback description
* @protected
*/
_submitForm : function (request, callback) {
var form = request.form;
form.target = "xIFrame" + request.id;
form.action = request.url;
form.method = request.method;
if (request.headers["Content-Type"]) {
try {
form.enctype = request.headers["Content-Type"];
} catch (ex) {
// This might throw an exception in IE if the content type is invalid.
}
}
try {
form.submit();
} catch (er) {
this.$logError(this.ERROR_DURING_SUBMIT, null, er);
this._deleteRequest(request);
aria.core.IO._handleTransactionResponse({
conn : {
status : 0,
responseText : null,
getAllResponseHeaders : function () {}
},
transaction : request.id
}, callback, true);
}
},
/**
* load and readystatechange event handler on the iFrame.
* @param {DOMEvent} event
*/
_iFrameReady : function (event) {
// This method cannot use 'this' because the scope is not aria.core.transport.IFrame when this method is
// called. It uses oSelf instead.
var event = event || Aria.$frameworkWindow.event;
var iFrame = event.target || event.srcElement;
if (!iFrame.readyState || /loaded|complete/.test(iFrame.readyState)) {
var reqId = /^xIFrame(\d+)$/.exec(iFrame.id)[1];
// Make sure things are async
setTimeout(function () {
aria.core.transport.IFrame._sendBackResult(reqId);
}, 4);
}
},
/**
* Sends back the results of the request
* @param {String} id Request id
* @protected
*/
_sendBackResult : function (id) {
var description = this._requests[id];
if (!description) {
// The request was aborted
return;
}
var request = description.request;
var callback = description.cb;
var iFrame = request.iFrame;
var responseText, contentDocument = iFrame.contentDocument, contentWindow;
if (contentDocument == null) {
var contentWindow = iFrame.contentWindow;
if (contentWindow) {
contentDocument = contentWindow.document;
}
}
if (contentDocument) {
var body = contentDocument.body || contentDocument.documentElement;
if (body) {
// this is for content displayed as text:
responseText = body.textContent || body.outerText;
}
var xmlDoc = contentDocument.XMLDocument;
// In IE, contentDocument contains a transformation of the document
// see: http://www.aspnet-answers.com/microsoft/JScript/29847637/javascript-ie-xml.aspx
if (xmlDoc) {
contentDocument = xmlDoc;
}
}
this._deleteRequest(request);
var response = {
status : 200,
responseText : responseText,
responseXML : contentDocument
};
callback.fn.call(callback.scope, false, callback.args, response);
},
/**
* Delete a request freing up memory
* @param {aria.core.CfgBeans.IOAsyncRequestCfg} request
*/
_deleteRequest : function (request) {
var iFrame = request.iFrame;
if (iFrame) {
var domEltToRemove = request.iFrameContainer || iFrame;
domEltToRemove.parentNode.removeChild(domEltToRemove);
// avoid leaks:
request.iFrameContainer = null;
request.iFrame = null;
iFrame.onload = null;
iFrame.onreadystatechange = null;
}
delete this._requests[request.id];
},
/**
* Abort method. Called after the request timeout
* @param {aria.core.CfgBeans.IOAsyncRequestCfg} request
* @return Boolean Whether the connection was aborted or not
*/
onAbort : function (request) {
this._deleteRequest(request);
return true;
}
}
});