Adding float-no-zero branch hosted build
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ahocevar
228
float-no-zero/closure-library/closure/goog/net/xmlhttp.js
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228
float-no-zero/closure-library/closure/goog/net/xmlhttp.js
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// Copyright 2006 The Closure Library Authors. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS-IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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/**
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* @fileoverview Low level handling of XMLHttpRequest.
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* @author arv@google.com (Erik Arvidsson)
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* @author dbk@google.com (David Barrett-Kahn)
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*/
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goog.provide('goog.net.DefaultXmlHttpFactory');
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goog.provide('goog.net.XmlHttp');
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goog.provide('goog.net.XmlHttp.OptionType');
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goog.provide('goog.net.XmlHttp.ReadyState');
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goog.require('goog.net.WrapperXmlHttpFactory');
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goog.require('goog.net.XmlHttpFactory');
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/**
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* Static class for creating XMLHttpRequest objects.
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* @return {!(XMLHttpRequest|GearsHttpRequest)} A new XMLHttpRequest object.
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*/
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goog.net.XmlHttp = function() {
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return goog.net.XmlHttp.factory_.createInstance();
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};
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/**
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* @define {boolean} Whether to assume XMLHttpRequest exists. Setting this to
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* true strips the ActiveX probing code.
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*/
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goog.define('goog.net.XmlHttp.ASSUME_NATIVE_XHR', false);
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/**
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* Gets the options to use with the XMLHttpRequest objects obtained using
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* the static methods.
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* @return {Object} The options.
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*/
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goog.net.XmlHttp.getOptions = function() {
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return goog.net.XmlHttp.factory_.getOptions();
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};
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/**
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* Type of options that an XmlHttp object can have.
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* @enum {number}
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*/
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goog.net.XmlHttp.OptionType = {
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/**
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* Whether a goog.nullFunction should be used to clear the onreadystatechange
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* handler instead of null.
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*/
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USE_NULL_FUNCTION: 0,
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/**
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* NOTE(user): In IE if send() errors on a *local* request the readystate
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* is still changed to COMPLETE. We need to ignore it and allow the
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* try/catch around send() to pick up the error.
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*/
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LOCAL_REQUEST_ERROR: 1
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};
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/**
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* Status constants for XMLHTTP, matches:
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* http://msdn.microsoft.com/library/default.asp?url=/library/
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* en-us/xmlsdk/html/0e6a34e4-f90c-489d-acff-cb44242fafc6.asp
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* @enum {number}
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*/
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goog.net.XmlHttp.ReadyState = {
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/**
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* Constant for when xmlhttprequest.readyState is uninitialized
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*/
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UNINITIALIZED: 0,
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/**
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* Constant for when xmlhttprequest.readyState is loading.
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*/
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LOADING: 1,
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/**
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* Constant for when xmlhttprequest.readyState is loaded.
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*/
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LOADED: 2,
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/**
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* Constant for when xmlhttprequest.readyState is in an interactive state.
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*/
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INTERACTIVE: 3,
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/**
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* Constant for when xmlhttprequest.readyState is completed
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*/
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COMPLETE: 4
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};
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/**
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* The global factory instance for creating XMLHttpRequest objects.
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* @type {goog.net.XmlHttpFactory}
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* @private
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*/
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goog.net.XmlHttp.factory_;
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/**
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* Sets the factories for creating XMLHttpRequest objects and their options.
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* @param {Function} factory The factory for XMLHttpRequest objects.
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* @param {Function} optionsFactory The factory for options.
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* @deprecated Use setGlobalFactory instead.
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*/
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goog.net.XmlHttp.setFactory = function(factory, optionsFactory) {
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goog.net.XmlHttp.setGlobalFactory(new goog.net.WrapperXmlHttpFactory(
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/** @type {function() : !(XMLHttpRequest|GearsHttpRequest)} */ (factory),
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/** @type {function() : !Object}*/ (optionsFactory)));
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};
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/**
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* Sets the global factory object.
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* @param {!goog.net.XmlHttpFactory} factory New global factory object.
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*/
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goog.net.XmlHttp.setGlobalFactory = function(factory) {
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goog.net.XmlHttp.factory_ = factory;
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};
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/**
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* Default factory to use when creating xhr objects. You probably shouldn't be
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* instantiating this directly, but rather using it via goog.net.XmlHttp.
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* @extends {goog.net.XmlHttpFactory}
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* @constructor
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*/
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goog.net.DefaultXmlHttpFactory = function() {
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goog.net.XmlHttpFactory.call(this);
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};
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goog.inherits(goog.net.DefaultXmlHttpFactory, goog.net.XmlHttpFactory);
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/** @override */
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goog.net.DefaultXmlHttpFactory.prototype.createInstance = function() {
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var progId = this.getProgId_();
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if (progId) {
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return new ActiveXObject(progId);
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} else {
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return new XMLHttpRequest();
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}
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};
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/** @override */
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goog.net.DefaultXmlHttpFactory.prototype.internalGetOptions = function() {
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var progId = this.getProgId_();
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var options = {};
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if (progId) {
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options[goog.net.XmlHttp.OptionType.USE_NULL_FUNCTION] = true;
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options[goog.net.XmlHttp.OptionType.LOCAL_REQUEST_ERROR] = true;
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}
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return options;
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};
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/**
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* The ActiveX PROG ID string to use to create xhr's in IE. Lazily initialized.
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* @type {string|undefined}
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* @private
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*/
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goog.net.DefaultXmlHttpFactory.prototype.ieProgId_;
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/**
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* Initialize the private state used by other functions.
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* @return {string} The ActiveX PROG ID string to use to create xhr's in IE.
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* @private
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*/
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goog.net.DefaultXmlHttpFactory.prototype.getProgId_ = function() {
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if (goog.net.XmlHttp.ASSUME_NATIVE_XHR) {
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return '';
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}
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// The following blog post describes what PROG IDs to use to create the
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// XMLHTTP object in Internet Explorer:
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// http://blogs.msdn.com/xmlteam/archive/2006/10/23/using-the-right-version-of-msxml-in-internet-explorer.aspx
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// However we do not (yet) fully trust that this will be OK for old versions
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// of IE on Win9x so we therefore keep the last 2.
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if (!this.ieProgId_ && typeof XMLHttpRequest == 'undefined' &&
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typeof ActiveXObject != 'undefined') {
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// Candidate Active X types.
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var ACTIVE_X_IDENTS = ['MSXML2.XMLHTTP.6.0', 'MSXML2.XMLHTTP.3.0',
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'MSXML2.XMLHTTP', 'Microsoft.XMLHTTP'];
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for (var i = 0; i < ACTIVE_X_IDENTS.length; i++) {
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var candidate = ACTIVE_X_IDENTS[i];
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/** @preserveTry */
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try {
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new ActiveXObject(candidate);
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// NOTE(user): cannot assign progid and return candidate in one line
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// because JSCompiler complaings: BUG 658126
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this.ieProgId_ = candidate;
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return candidate;
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} catch (e) {
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// do nothing; try next choice
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}
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}
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// couldn't find any matches
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throw Error('Could not create ActiveXObject. ActiveX might be disabled,' +
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' or MSXML might not be installed');
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}
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return /** @type {string} */ (this.ieProgId_);
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};
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//Set the global factory to an instance of the default factory.
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goog.net.XmlHttp.setGlobalFactory(new goog.net.DefaultXmlHttpFactory());
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