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510 lines
14 KiB
JavaScript
510 lines
14 KiB
JavaScript
/**
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* XMLHttpRequest.js Copyright (C) 2011 Sergey Ilinsky (http://www.ilinsky.com)
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*
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* This work is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 2.1 of the License, or
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* (at your option) any later version.
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*
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* This work is distributed in the hope that it will be useful,
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* but without any warranty; without even the implied warranty of
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* merchantability or fitness for a particular purpose. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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(function () {
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// Save reference to earlier defined object implementation (if any)
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var oXMLHttpRequest = window.XMLHttpRequest;
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// Define on browser type
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var bGecko = !!window.controllers;
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var bIE = window.document.all && !window.opera;
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var bIE7 = bIE && window.navigator.userAgent.match(/MSIE 7.0/);
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// Enables "XMLHttpRequest()" call next to "new XMLHttpReques()"
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function fXMLHttpRequest() {
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this._object = oXMLHttpRequest && !bIE7 ? new oXMLHttpRequest : new window.ActiveXObject("Microsoft.XMLHTTP");
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this._listeners = [];
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}
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// Constructor
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function cXMLHttpRequest() {
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return new fXMLHttpRequest;
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}
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cXMLHttpRequest.prototype = fXMLHttpRequest.prototype;
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// BUGFIX: Firefox with Firebug installed would break pages if not executed
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if (bGecko && oXMLHttpRequest.wrapped) {
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cXMLHttpRequest.wrapped = oXMLHttpRequest.wrapped;
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}
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// Constants
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cXMLHttpRequest.UNSENT = 0;
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cXMLHttpRequest.OPENED = 1;
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cXMLHttpRequest.HEADERS_RECEIVED = 2;
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cXMLHttpRequest.LOADING = 3;
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cXMLHttpRequest.DONE = 4;
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// Public Properties
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cXMLHttpRequest.prototype.readyState = cXMLHttpRequest.UNSENT;
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cXMLHttpRequest.prototype.responseText = '';
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cXMLHttpRequest.prototype.responseXML = null;
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cXMLHttpRequest.prototype.status = 0;
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cXMLHttpRequest.prototype.statusText = '';
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// Priority proposal
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cXMLHttpRequest.prototype.priority = "NORMAL";
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// Instance-level Events Handlers
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cXMLHttpRequest.prototype.onreadystatechange = null;
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// Class-level Events Handlers
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cXMLHttpRequest.onreadystatechange = null;
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cXMLHttpRequest.onopen = null;
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cXMLHttpRequest.onsend = null;
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cXMLHttpRequest.onabort = null;
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// Public Methods
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cXMLHttpRequest.prototype.open = function(sMethod, sUrl, bAsync, sUser, sPassword) {
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// Delete headers, required when object is reused
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delete this._headers;
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// When bAsync parameter value is omitted, use true as default
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if (arguments.length < 3) {
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bAsync = true;
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}
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// Save async parameter for fixing Gecko bug with missing readystatechange in synchronous requests
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this._async = bAsync;
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// Set the onreadystatechange handler
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var oRequest = this;
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var nState = this.readyState;
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var fOnUnload = null;
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// BUGFIX: IE - memory leak on page unload (inter-page leak)
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if (bIE && bAsync) {
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fOnUnload = function() {
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if (nState != cXMLHttpRequest.DONE) {
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fCleanTransport(oRequest);
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// Safe to abort here since onreadystatechange handler removed
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oRequest.abort();
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}
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};
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window.attachEvent("onunload", fOnUnload);
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}
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// Add method sniffer
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if (cXMLHttpRequest.onopen) {
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cXMLHttpRequest.onopen.apply(this, arguments);
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}
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if (arguments.length > 4) {
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this._object.open(sMethod, sUrl, bAsync, sUser, sPassword);
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} else if (arguments.length > 3) {
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this._object.open(sMethod, sUrl, bAsync, sUser);
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} else {
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this._object.open(sMethod, sUrl, bAsync);
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}
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this.readyState = cXMLHttpRequest.OPENED;
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fReadyStateChange(this);
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this._object.onreadystatechange = function() {
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if (bGecko && !bAsync) {
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return;
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}
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// Synchronize state
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oRequest.readyState = oRequest._object.readyState;
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fSynchronizeValues(oRequest);
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// BUGFIX: Firefox fires unnecessary DONE when aborting
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if (oRequest._aborted) {
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// Reset readyState to UNSENT
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oRequest.readyState = cXMLHttpRequest.UNSENT;
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// Return now
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return;
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}
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if (oRequest.readyState == cXMLHttpRequest.DONE) {
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// Free up queue
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delete oRequest._data;
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// Uncomment these lines for bAsync
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/**
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* if (bAsync) {
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* fQueue_remove(oRequest);
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* }
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*/
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fCleanTransport(oRequest);
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// Uncomment this block if you need a fix for IE cache
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/**
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* // BUGFIX: IE - cache issue
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* if (!oRequest._object.getResponseHeader("Date")) {
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* // Save object to cache
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* oRequest._cached = oRequest._object;
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*
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* // Instantiate a new transport object
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* cXMLHttpRequest.call(oRequest);
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*
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* // Re-send request
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* if (sUser) {
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* if (sPassword) {
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* oRequest._object.open(sMethod, sUrl, bAsync, sUser, sPassword);
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* } else {
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* oRequest._object.open(sMethod, sUrl, bAsync);
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* }
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*
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* oRequest._object.setRequestHeader("If-Modified-Since", oRequest._cached.getResponseHeader("Last-Modified") || new window.Date(0));
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* // Copy headers set
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* if (oRequest._headers) {
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* for (var sHeader in oRequest._headers) {
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* // Some frameworks prototype objects with functions
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* if (typeof oRequest._headers[sHeader] == "string") {
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* oRequest._object.setRequestHeader(sHeader, oRequest._headers[sHeader]);
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* }
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* }
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* }
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* oRequest._object.onreadystatechange = function() {
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* // Synchronize state
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* oRequest.readyState = oRequest._object.readyState;
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*
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* if (oRequest._aborted) {
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* //
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* oRequest.readyState = cXMLHttpRequest.UNSENT;
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*
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* // Return
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* return;
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* }
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*
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* if (oRequest.readyState == cXMLHttpRequest.DONE) {
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* // Clean Object
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* fCleanTransport(oRequest);
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*
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* // get cached request
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* if (oRequest.status == 304) {
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* oRequest._object = oRequest._cached;
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* }
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*
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* //
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* delete oRequest._cached;
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*
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* //
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* fSynchronizeValues(oRequest);
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*
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* //
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* fReadyStateChange(oRequest);
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*
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* // BUGFIX: IE - memory leak in interrupted
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* if (bIE && bAsync) {
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* window.detachEvent("onunload", fOnUnload);
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* }
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*
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* }
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* };
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* oRequest._object.send(null);
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*
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* // Return now - wait until re-sent request is finished
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* return;
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* };
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*/
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// BUGFIX: IE - memory leak in interrupted
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if (bIE && bAsync) {
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window.detachEvent("onunload", fOnUnload);
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}
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// BUGFIX: Some browsers (Internet Explorer, Gecko) fire OPEN readystate twice
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if (nState != oRequest.readyState) {
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fReadyStateChange(oRequest);
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}
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nState = oRequest.readyState;
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}
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};
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};
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cXMLHttpRequest.prototype.send = function(vData) {
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// Add method sniffer
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if (cXMLHttpRequest.onsend) {
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cXMLHttpRequest.onsend.apply(this, arguments);
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}
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if (!arguments.length) {
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vData = null;
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}
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// BUGFIX: Safari - fails sending documents created/modified dynamically, so an explicit serialization required
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// BUGFIX: IE - rewrites any custom mime-type to "text/xml" in case an XMLNode is sent
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// BUGFIX: Gecko - fails sending Element (this is up to the implementation either to standard)
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if (vData && vData.nodeType) {
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vData = window.XMLSerializer ? new window.XMLSerializer().serializeToString(vData) : vData.xml;
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if (!this._headers["Content-Type"]) {
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this._object.setRequestHeader("Content-Type", "application/xml");
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}
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}
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this._data = vData;
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/**
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* // Add to queue
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* if (this._async) {
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* fQueue_add(this);
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* } else { */
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fXMLHttpRequest_send(this);
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/**
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* }
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*/
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};
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cXMLHttpRequest.prototype.abort = function() {
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// Add method sniffer
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if (cXMLHttpRequest.onabort) {
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cXMLHttpRequest.onabort.apply(this, arguments);
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}
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// BUGFIX: Gecko - unnecessary DONE when aborting
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if (this.readyState > cXMLHttpRequest.UNSENT) {
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this._aborted = true;
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}
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this._object.abort();
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// BUGFIX: IE - memory leak
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fCleanTransport(this);
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this.readyState = cXMLHttpRequest.UNSENT;
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delete this._data;
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/* if (this._async) {
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* fQueue_remove(this);
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* }
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*/
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};
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cXMLHttpRequest.prototype.getAllResponseHeaders = function() {
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return this._object.getAllResponseHeaders();
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};
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cXMLHttpRequest.prototype.getResponseHeader = function(sName) {
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return this._object.getResponseHeader(sName);
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};
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cXMLHttpRequest.prototype.setRequestHeader = function(sName, sValue) {
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// BUGFIX: IE - cache issue
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if (!this._headers) {
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this._headers = {};
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}
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this._headers[sName] = sValue;
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return this._object.setRequestHeader(sName, sValue);
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};
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// EventTarget interface implementation
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cXMLHttpRequest.prototype.addEventListener = function(sName, fHandler, bUseCapture) {
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for (var nIndex = 0, oListener; oListener = this._listeners[nIndex]; nIndex++) {
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if (oListener[0] == sName && oListener[1] == fHandler && oListener[2] == bUseCapture) {
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return;
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}
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}
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// Add listener
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this._listeners.push([sName, fHandler, bUseCapture]);
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};
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cXMLHttpRequest.prototype.removeEventListener = function(sName, fHandler, bUseCapture) {
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for (var nIndex = 0, oListener; oListener = this._listeners[nIndex]; nIndex++) {
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if (oListener[0] == sName && oListener[1] == fHandler && oListener[2] == bUseCapture) {
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break;
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}
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}
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// Remove listener
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if (oListener) {
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this._listeners.splice(nIndex, 1);
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}
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};
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cXMLHttpRequest.prototype.dispatchEvent = function(oEvent) {
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var oEventPseudo = {
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'type': oEvent.type,
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'target': this,
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'currentTarget': this,
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'eventPhase': 2,
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'bubbles': oEvent.bubbles,
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'cancelable': oEvent.cancelable,
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'timeStamp': oEvent.timeStamp,
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'stopPropagation': function() {}, // There is no flow
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'preventDefault': function() {}, // There is no default action
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'initEvent': function() {} // Original event object should be initialized
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};
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// Execute onreadystatechange
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if (oEventPseudo.type == "readystatechange" && this.onreadystatechange) {
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(this.onreadystatechange.handleEvent || this.onreadystatechange).apply(this, [oEventPseudo]);
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}
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// Execute listeners
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for (var nIndex = 0, oListener; oListener = this._listeners[nIndex]; nIndex++) {
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if (oListener[0] == oEventPseudo.type && !oListener[2]) {
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(oListener[1].handleEvent || oListener[1]).apply(this, [oEventPseudo]);
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}
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}
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};
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//
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cXMLHttpRequest.prototype.toString = function() {
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return '[' + "object" + ' ' + "XMLHttpRequest" + ']';
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};
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cXMLHttpRequest.toString = function() {
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return '[' + "XMLHttpRequest" + ']';
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};
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/**
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* // Queue manager
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* var oQueuePending = {"CRITICAL":[],"HIGH":[],"NORMAL":[],"LOW":[],"LOWEST":[]},
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* aQueueRunning = [];
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* function fQueue_add(oRequest) {
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* oQueuePending[oRequest.priority in oQueuePending ? oRequest.priority : "NORMAL"].push(oRequest);
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* //
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* setTimeout(fQueue_process);
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* };
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*
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* function fQueue_remove(oRequest) {
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* for (var nIndex = 0, bFound = false; nIndex < aQueueRunning.length; nIndex++)
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* if (bFound) {
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* aQueueRunning[nIndex - 1] = aQueueRunning[nIndex];
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* } else {
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* if (aQueueRunning[nIndex] == oRequest) {
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* bFound = true;
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* }
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* }
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*
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* if (bFound) {
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* aQueueRunning.length--;
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* }
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*
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*
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* //
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* setTimeout(fQueue_process);
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* };
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*
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* function fQueue_process() {
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* if (aQueueRunning.length < 6) {
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* for (var sPriority in oQueuePending) {
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* if (oQueuePending[sPriority].length) {
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* var oRequest = oQueuePending[sPriority][0];
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* oQueuePending[sPriority] = oQueuePending[sPriority].slice(1);
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* //
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* aQueueRunning.push(oRequest);
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* // Send request
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* fXMLHttpRequest_send(oRequest);
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* break;
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* }
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* }
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* }
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* };
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*/
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// Helper function
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function fXMLHttpRequest_send(oRequest) {
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oRequest._object.send(oRequest._data);
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// BUGFIX: Gecko - missing readystatechange calls in synchronous requests
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if (bGecko && !oRequest._async) {
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oRequest.readyState = cXMLHttpRequest.OPENED;
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// Synchronize state
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fSynchronizeValues(oRequest);
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// Simulate missing states
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while (oRequest.readyState < cXMLHttpRequest.DONE) {
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oRequest.readyState++;
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fReadyStateChange(oRequest);
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// Check if we are aborted
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if (oRequest._aborted) {
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return;
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}
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}
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}
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}
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function fReadyStateChange(oRequest) {
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// Sniffing code
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if (cXMLHttpRequest.onreadystatechange){
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cXMLHttpRequest.onreadystatechange.apply(oRequest);
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}
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// Fake event
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oRequest.dispatchEvent({
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'type': "readystatechange",
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'bubbles': false,
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'cancelable': false,
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'timeStamp': new Date + 0
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});
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}
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function fGetDocument(oRequest) {
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var oDocument = oRequest.responseXML;
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var sResponse = oRequest.responseText;
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// Try parsing responseText
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if (bIE && sResponse && oDocument && !oDocument.documentElement && oRequest.getResponseHeader("Content-Type").match(/[^\/]+\/[^\+]+\+xml/)) {
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oDocument = new window.ActiveXObject("Microsoft.XMLDOM");
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oDocument.async = false;
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oDocument.validateOnParse = false;
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oDocument.loadXML(sResponse);
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}
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// Check if there is no error in document
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if (oDocument){
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if ((bIE && oDocument.parseError !== 0) || !oDocument.documentElement || (oDocument.documentElement && oDocument.documentElement.tagName == "parsererror")) {
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return null;
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}
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}
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return oDocument;
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}
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function fSynchronizeValues(oRequest) {
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try { oRequest.responseText = oRequest._object.responseText; } catch (e) {}
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try { oRequest.responseXML = fGetDocument(oRequest._object); } catch (e) {}
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try { oRequest.status = oRequest._object.status; } catch (e) {}
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try { oRequest.statusText = oRequest._object.statusText; } catch (e) {}
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}
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function fCleanTransport(oRequest) {
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// BUGFIX: IE - memory leak (on-page leak)
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oRequest._object.onreadystatechange = new window.Function;
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}
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// Internet Explorer 5.0 (missing apply)
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if (!window.Function.prototype.apply) {
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window.Function.prototype.apply = function(oRequest, oArguments) {
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if (!oArguments) {
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oArguments = [];
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}
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oRequest.__func = this;
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oRequest.__func(oArguments[0], oArguments[1], oArguments[2], oArguments[3], oArguments[4]);
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delete oRequest.__func;
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};
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}
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// Register new object with window
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window.XMLHttpRequest = cXMLHttpRequest;
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})();
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