[Javascript] Ajax Engine for Nokia Widget

/********************************************************************************* * * Description : AJAX engine (Browser crossed) * Copyright : Copyright(c) 2007 * Company : Tencent Inc. * * @author Moky * @version 1.0 2007-11-27 * *********************************************************************************//** * * @param * * @return aRequest */function createHttpRequest() {var httpRequest = null;if (window.XMLHttpRequest) {try {//netscape.security.PrivilegeManager.enablePrivilege("UniversalBrowserRead");} catch (e) {}}if (typeof XMLHttpRequest != "undefined") {httpRequest = new XMLHttpRequest();} else if (window.ActiveXObject) { // IE var arr = ['MSXML3.XMLHTTP',//'MSXML2.XMLHTTP.6.0',//'MSXML2.XMLHTTP.5.0',//'MSXML2.XMLHTTP.4.0',//'MSXML2.XMLHTTP.3.0',//'MSXML2.XMLHTTP','Microsoft.XMLHTTP',//'MSXML2.DOMDocument.6.0',//'MSXML2.DOMDocument.5.0',//'MSXML2.DOMDocument.4.0',//'MSXML2.DOMDocument.3.0',//'MSXML2.DOMDocument',//'MSXML3.DOMDocument',//'Microsoft.XMLDOM',null];for (var i = 0; i < arr.length; i++) {try {return new ActiveXObject(arr[i]);} catch(e) {}}} else if (window.XMLHttpRequest) { // Mozilla, Safari, httpRequest = new XMLHttpRequest(); if (httpRequest.readyState == null) {httpRequest.readyState = 1;httpRequest.addEventListener("load", function () {httpRequest.readyState = 4;if (typeof httpRequest.onreadystatechange == "function") {httpRequest.onreadystatechange();}}, false);}} // end of if (typeof XMLHttpRequest != "undefined")if (!httpRequest) {alert("httpRequest not created");}return httpRequest;}/** * * @param request -- a valid request * @param url -- an exists URL * @param callback -- callback handler * * @return none */function sendHttpRequest(argv) {if (!argv) return ;var request = argv.request;var url = argv.url;var post_data = argv.post_data;var charset = argv.charset;var callback = argv.callback;if (!charset) {charset = 'utf-8';}if (!request) {request = createHttpRequest();if (!request) {alert("cannot create XmlHttpRequest object");return ;}}if (!url) {alert("url is emply");return ;}url = correct_url(url);/*var arr = url.split('?', 2);if (arr.length == 2) {url = arr[0];if (!post_data) {post_data = arr[1];} else {post_data += '&' + arr[1];}}*/if (!post_data) {request.open("GET", url, true);request.setRequestHeader('Content-Type', 'text/plain; charset=' + charset);post_data = null;} else {request.open("POST", url, true);request.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded; charset=' + charset);}request.onreadystatechange = function() {try {if (callback && request.readyState == 4 && request.status == 200) {callback(request.responseText);}} catch (e) {}};request.send(post_data);}function correct_url(s) {if (!s || s.indexOf('://') > 0) return s;var url_pre = document.location.href;var url_end = s;if (url_end.substring(0, 1) == '/') {url_pre = url_pre.substring(0, url_pre.indexOf('/', url_pre.indexOf('://') + 3));url_end = url_end.substring(1);} else {url_pre = url_pre.substring(0, url_pre.lastIndexOf('/'));while (url_end.substring(0, 3) == '../') {url_pre = url_pre.substring(0, url_pre.lastIndexOf('/'));url_end = url_end.substring(3);}}return url_pre + '/' + url_end;}