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// Copyright 2006 The Closure Library Authors. All Rights Reserved.
//
// 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.
/**
* @fileoverview Low level handling of XMLHttpRequest.
* @author arv@google.com (Erik Arvidsson)
* @author dbk@google.com (David Barrett-Kahn)
*/
goog.provide('goog.net.DefaultXmlHttpFactory');
goog.provide('goog.net.XmlHttp');
goog.provide('goog.net.XmlHttp.OptionType');
goog.provide('goog.net.XmlHttp.ReadyState');
goog.require('goog.net.WrapperXmlHttpFactory');
goog.require('goog.net.XmlHttpFactory');
/**
* Static class for creating XMLHttpRequest objects.
* @return {!(XMLHttpRequest|GearsHttpRequest)} A new XMLHttpRequest object.
*/
goog.net.XmlHttp = function() {
return goog.net.XmlHttp.factory_.createInstance();
};
/**
* @define {boolean} Whether to assume XMLHttpRequest exists. Setting this to
* true strips the ActiveX probing code.
*/
goog.net.XmlHttp.ASSUME_NATIVE_XHR = false;
/**
* Gets the options to use with the XMLHttpRequest objects obtained using
* the static methods.
* @return {Object} The options.
*/
goog.net.XmlHttp.getOptions = function() {
return goog.net.XmlHttp.factory_.getOptions();
};
/**
* Type of options that an XmlHttp object can have.
* @enum {number}
*/
goog.net.XmlHttp.OptionType = {
/**
* Whether a goog.nullFunction should be used to clear the onreadystatechange
* handler instead of null.
*/
USE_NULL_FUNCTION: 0,
/**
* NOTE(user): In IE if send() errors on a *local* request the readystate
* is still changed to COMPLETE. We need to ignore it and allow the
* try/catch around send() to pick up the error.
*/
LOCAL_REQUEST_ERROR: 1
};
/**
* Status constants for XMLHTTP, matches:
* http://msdn.microsoft.com/library/default.asp?url=/library/
* en-us/xmlsdk/html/0e6a34e4-f90c-489d-acff-cb44242fafc6.asp
* @enum {number}
*/
goog.net.XmlHttp.ReadyState = {
/**
* Constant for when xmlhttprequest.readyState is uninitialized
*/
UNINITIALIZED: 0,
/**
* Constant for when xmlhttprequest.readyState is loading.
*/
LOADING: 1,
/**
* Constant for when xmlhttprequest.readyState is loaded.
*/
LOADED: 2,
/**
* Constant for when xmlhttprequest.readyState is in an interactive state.
*/
INTERACTIVE: 3,
/**
* Constant for when xmlhttprequest.readyState is completed
*/
COMPLETE: 4
};
/**
* The global factory instance for creating XMLHttpRequest objects.
* @type {goog.net.XmlHttpFactory}
* @private
*/
goog.net.XmlHttp.factory_;
/**
* Sets the factories for creating XMLHttpRequest objects and their options.
* @param {Function} factory The factory for XMLHttpRequest objects.
* @param {Function} optionsFactory The factory for options.
* @deprecated Use setGlobalFactory instead.
*/
goog.net.XmlHttp.setFactory = function(factory, optionsFactory) {
goog.net.XmlHttp.setGlobalFactory(new goog.net.WrapperXmlHttpFactory(
(/** @type {function() : !(XMLHttpRequest|GearsHttpRequest)} */ factory),
(/** @type {function() : !Object}*/ optionsFactory)));
};
/**
* Sets the global factory object.
* @param {!goog.net.XmlHttpFactory} factory New global factory object.
*/
goog.net.XmlHttp.setGlobalFactory = function(factory) {
goog.net.XmlHttp.factory_ = factory;
};
/**
* Default factory to use when creating xhr objects. You probably shouldn't be
* instantiating this directly, but rather using it via goog.net.XmlHttp.
* @extends {goog.net.XmlHttpFactory}
* @constructor
*/
goog.net.DefaultXmlHttpFactory = function() {
goog.net.XmlHttpFactory.call(this);
};
goog.inherits(goog.net.DefaultXmlHttpFactory, goog.net.XmlHttpFactory);
/** @override */
goog.net.DefaultXmlHttpFactory.prototype.createInstance = function() {
var progId = this.getProgId_();
if (progId) {
return new ActiveXObject(progId);
} else {
return new XMLHttpRequest();
}
};
/** @override */
goog.net.DefaultXmlHttpFactory.prototype.internalGetOptions = function() {
var progId = this.getProgId_();
var options = {};
if (progId) {
options[goog.net.XmlHttp.OptionType.USE_NULL_FUNCTION] = true;
options[goog.net.XmlHttp.OptionType.LOCAL_REQUEST_ERROR] = true;
}
return options;
};
/**
* The ActiveX PROG ID string to use to create xhr's in IE. Lazily initialized.
* @type {string|undefined}
* @private
*/
goog.net.DefaultXmlHttpFactory.prototype.ieProgId_;
/**
* Initialize the private state used by other functions.
* @return {string} The ActiveX PROG ID string to use to create xhr's in IE.
* @private
*/
goog.net.DefaultXmlHttpFactory.prototype.getProgId_ = function() {
if (goog.net.XmlHttp.ASSUME_NATIVE_XHR) {
return '';
}
// The following blog post describes what PROG IDs to use to create the
// XMLHTTP object in Internet Explorer:
// http://blogs.msdn.com/xmlteam/archive/2006/10/23/using-the-right-version-of-msxml-in-internet-explorer.aspx
// However we do not (yet) fully trust that this will be OK for old versions
// of IE on Win9x so we therefore keep the last 2.
if (!this.ieProgId_ && typeof XMLHttpRequest == 'undefined' &&
typeof ActiveXObject != 'undefined') {
// Candidate Active X types.
var ACTIVE_X_IDENTS = ['MSXML2.XMLHTTP.6.0', 'MSXML2.XMLHTTP.3.0',
'MSXML2.XMLHTTP', 'Microsoft.XMLHTTP'];
for (var i = 0; i < ACTIVE_X_IDENTS.length; i++) {
var candidate = ACTIVE_X_IDENTS[i];
/** @preserveTry */
try {
new ActiveXObject(candidate);
// NOTE(user): cannot assign progid and return candidate in one line
// because JSCompiler complaings: BUG 658126
this.ieProgId_ = candidate;
return candidate;
} catch (e) {
// do nothing; try next choice
}
}
// couldn't find any matches
throw Error('Could not create ActiveXObject. ActiveX might be disabled,' +
' or MSXML might not be installed');
}
return /** @type {string} */ (this.ieProgId_);
};
//Set the global factory to an instance of the default factory.
goog.net.XmlHttp.setGlobalFactory(new goog.net.DefaultXmlHttpFactory());
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