/* AJAX v1.4 HJF 2009-7-5 */ function AjaxDO(){ this.HttpRequest = null; this.openMethod = null; //HTTP请求的方法,为Get、Post 或者Head this.openURL = null; //是目标URL。基于安全考虑,这个URL 只能是同网域的,否则会提示“没有权限”的错误。 this.openAsync = null; //是指定在等待服务器返回信息的时间内是否继续执行下面的代码。如果为False,则不会继续执行,直到服务器返回信息。默认为True。 this.ProcessRequestFunction = function(_HttpRequest) {return;} //处理返回信息的函数入口 this.ProcessRequestParam = null; //处理访问信息时的附加参数 this.LoadingImg = null; //正在载入的图片,一般为.gif动画 //初始化HttpRequest this.InitHttpRequest = function(){ var http; // try { // http = new ActiveXObject("Msxml2.XMLHTTP"); // } catch(e) { // try { // http = new ActiveXObject("Microsoft.XMLHTTP"); // } catch(e) { // http = false; // } // } try { if(window.ActiveXObject){ for(var i=5; i; i--){ try{ if(i==2){ http = new ActiveXObject("Microsoft.XMLHTTP"); }else{ http = new ActiveXObject( "Msxml2.XMLHTTP." + i + ".0" ); } break; }catch(e){ //alert(i); http = false; } } }else if(window.XMLHttpRequest){ http = new XMLHttpRequest(); if(http.overrideMimeType){ http.overrideMimeType("text/xml"); } } }catch(e){ http = false; } if(!http){ Alert("不能创建XMLHttpRequest对象实例"); return http; } this.HttpRequest = http; return http; } //检测 this.HttpRequest this.checkHttpRequest = function(){ if(!this.HttpRequest){ return this.InitHttpRequest(); } return this.HttpRequest; } //修改MIME类别 //http.setRequestHeader("Content-Type", "application/x-www-form-urlencoded"); //如果要传文件或者Post 内容给服务器 //http.setRequestHeader("Content-Type","text/xml"); //http.setRequestHeader("Content-Type","gb2312"); this.setRequestHeader = function(mime){ if(!this.checkHttpRequest()){ return false; } try{ this.HttpRequest.setRequestHeader("Content-Type", mime); return true; }catch(e){ if(e instanceof Error){ Alert("修改MIME类别错误"); return false; } } } //设置状态改变的事件触发器 this.setOnReadyStateChange = function(funHandle, Param){ if(!this.checkHttpRequest()){ return false; } this.ProcessRequestFunction = funHandle; this.ProcessRequestParam = Param; return true; } this.setLoadingImg = function(ImgID){ this.LoadingImg = ImgID; } //建立HTTP连接 //open("method","URL"[,asyncFlag[,"userName"[, "password"]]]) this.Open = function(method, url, async, username, psw){ if(!this.checkHttpRequest()){ return false; } this.openMethod = method; this.openURL = url; this.openAsync = async; if((this.openMethod==null) || ((this.openMethod.toUpperCase()!="GET")&&(this.openMethod.toUpperCase()!="POST")&&(this.openMethod.toUpperCase()!="HEAD"))){ Alert("请指定HTTP请求的方法,为Get、Post 或者Head"); return false; } if((this.openURL==null)||(this.openURL=="")){ Alert("请指定目标URL"); return false; } try{ this.HttpRequest.open(this.openMethod, this.openURL, this.openAsync, username, psw); }catch(e){ if(e instanceof Error){ Alert("无法建立HTTP连接"); return false; } } if(this.openMethod.toUpperCase()=="POST"){ if(!this.setRequestHeader("application/x-www-form-urlencoded")){ Alert("修改MIME类别失败"); return false; } } if(this.openAsync){ //异步模式,程序继续执行 if(this.ProcessRequestFunction==null){ Alert("请指定处理返回信息的函数"); return false; } var _http_request_ajax = this.HttpRequest; var _this_ajax = this; this.HttpRequest.onreadystatechange = function(){ if(_http_request_ajax.readyState==4) { if(_http_request_ajax.status==200) { _this_ajax.ProcessRequestFunction(_http_request_ajax, _this_ajax.ProcessRequestParam, _this_ajax.LoadingImg); }else{ Alert("您所请求的页面有异常。"); return false; } } } } if(this.LoadingImg!=null){ funShow(this.LoadingImg); } return true; } //向服务器发出HTTP请求 //格式:name=value&anothername=othervalue&so=on this.Send = function(idata){ if(!this.checkHttpRequest()){ return false; } var data = null; if(this.openMethod.toUpperCase()=="POST"){ data = funEscapeAll(idata); } try{ this.HttpRequest.send(data); return true; }catch(e){ if(e instanceof Error){ Alert("向服务器发出HTTP请求失败"); return false; } } } //处理服务器返回的信息 this.getResponseText = function(type){ if(!this.checkHttpRequest()){ return false; } if(this.HttpRequest.readyState==4) { if(this.HttpRequest.status==200) { if((type!=null) && (type.toUpperCase()=="XML")){ return this.HttpRequest.responseXML; } return this.HttpRequest.responseText; }else{ Alert("您所请求的页面有异常。"); return false; } } } //停止当前请求 this.abort = function(){ if(!this.checkHttpRequest()){ return false; } if(this.LoadingImg!=null){ funHide(this.LoadingImg); } if(this.HttpRequest.readyState>0 && this.HttpRequest.readyState<4){ this.HttpRequest.abort(); } } } //===================================================================================== //公共函数 //===================================================================================== function $(_obj){ var o; if (typeof(_obj)!="string") return _obj; else{ try{ document.all; try{ o=document.all(_obj); }catch(e){ return null; } }catch(ee){ try{ o=document.getElementById(_obj); }catch(e){ return null; } } return o; } } function funEscapeAll(str){ var t = "&"; var s = str.split(t); if(s.length<=0) return str; for(var i=0; i<s.length; i++){ s[i] = funEscapeOne(s[i]); } return s.join(t); } function funEscapeOne(str){ var i = str.indexOf("="); if(i==-1) return str; var t = URLEncode(str.substr(i+1)); return str.substring(0, i+1)+t; } function URLEncode(str){ return encodeURIComponent(str); /* return escape(str).replace(/\+/g, "%2B"). replace(/\"/g,"%22"). replace(/\'/g, "%27"). replace(/\//g,"%2F"); */ } function funEscapeXML(content) { if (content == undefined) return ""; if (!content.length || !content.charAt) content = new String(content); var result = ""; var length = content.length; for (var i = 0; i < length; i++) { var ch = content.charAt(i); switch (ch) { case '&': result += "&"; break; case '<': result += "<"; break; case '>': result += ">"; break; case '"': result += """; break; case '\'': result += "'"; break; default: result += ch; } } return result; } function funShow(_obj){ if(typeof(_obj)=="object") _obj.style.visibility = "inherit"; else $(_obj).style.visibility = "inherit"; } function funHide(_obj){ if(typeof(_obj)=="object") _obj.style.visibility = "hidden"; else $(_obj).style.visibility = "hidden"; } function Alert(str){ alert(str); //window.status = str; } /* 使用例子: function processRequest(http_request, _val, _loading_img){ if(http_request.responseXML.documentElement){ //alert(decodeURIComponent(http_request.responseXML.documentElement.xml)); }else{ //alert(decodeURIComponent(http_request.responseText)); } alert(_val); funHide(_loading_img); } 1、GET var ajax = new AjaxDO(); ajax.setLoadingImg(_loading_img); ajax.setOnReadyStateChange(processRequest, _val); ajax.Open("GET", url, true); //异步模式,程序继续执行 ajax.Send(""); ajax.Open("GET", url, false); //非异步模式,程序等待 ajax.Send(""); var xml_doc = ajax.getResponseText("XML"); var text_doc = ajax.getResponseText("TEXT"); 2、POST var ajax = new AjaxDO(); ajax.setLoadingImg(_loading_img); ajax.setOnReadyStateChange(processRequest, _val); ajax.Open("POST", url, true); //异步模式,程序继续执行 ajax.Send(data); ajax.Open("POST", url, false); //非异步模式,程序等待 ajax.Send(data); var xml_doc = ajax.getResponseText("XML"); var text_doc = ajax.getResponseText("TEXT"); 注,客户端发送带有中文或HTML脚本的信息时,发送的信息必须调用:encodeURIComponent函数,例如: var data = encodeURIComponent($('message').value); 实际是调用了两次,Ajax类内部又调用一次。 服务端(Java版)需要做下转码: String message = request.getParameter("message"); message = URLDecoder.decode(message, "UTF-8"); */ 注,客户端发送带有中文或HTML脚本的信息时,发送的信息必须调用:encodeURIComponent函数,例如: String message = request.getParameter("message"); message = URLDecoder.decode(message, "UTF-8"); 2、Demo.html Ajax类<style type="text/css"><!-- #Layer1 { position:absolute; left:670px; top:11px; width:15px; height:15px; z-index:10000; background-color:#FF0000; font-size:13; border:none; visibility:hidden; } --></style><style type="text/css" bogus="1">#Layer1 { position:absolute; left:670px; top:11px; width:15px; height:15px; z-index:10000; background-color:#FF0000; font-size:13; border:none; visibility:hidden; }</style> </head> <body> <div id="Layer1"><img src="/static/imghwm/default1.png" data-src="http://www.jb51.net/article/indicator_flower.gif" class="lazy" / alt="JavaScript Ajax class example code" ></div> <script type="text/javascript" language="javascript"><!-- function processRequest(http_request, _val, _loading_img){ alert(http_request.responseXML.documentElement.xml); //alert(http_request.responseText); funHide(_loading_img); } // --></script> <script type="text/javascript" language="javascript"><!-- var url = "http://www.w3schools.com/xml/simple.xml"; var data = ""; var ajax = new AjaxDO(); function btnAjax1(){ //var ajax = new AjaxDO(); //ajax.InitHttpRequest(); ajax.abort(); ajax.setLoadingImg(document.getElementById("Layer1")); ajax.setOnReadyStateChange(processRequest); ajax.Open("GET", url, true); //异步模式,程序继续执行 ajax.Send(""); } function btnAjax2(){ //var ajax = new AjaxDO(); //ajax.InitHttpRequest(); ajax.abort(); ajax.Open("GET", url, false); //非异步模式,程序等待 ajax.Send(""); alert(ajax.getResponseText("XML").documentElement.xml); alert(ajax.getResponseText("TEXT")); } // --></script> <button >异步模式</button> <button >非异步模式</button> </body> </html>

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