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copied!<p>Problem in this ajax library. </p> <p><code>XHR.setRequestHeader()</code> must be called after <code>XHR.open()</code>.</p> <pre><code>// @method XRequest: Object constructor. As this implements a singleton, the object can't be created calling the constructor, GetInstance should be called instead function XRequest() { this.XHR = XRequest.CreateXHR(); } XRequest.instance = null; // @method static GetInstance: Creates a singleton object of type XRequest. Should be called whenever an object of that type is required. // @return: an instance of a XRequest object XRequest.GetInstance = function() { if(XRequest.instance == null) { XRequest.instance = new XRequest(); } return XRequest.instance; } // @method static CreateXHR: Implments a basic factory method for creating a XMLHttpRequest object // @return: XMLHttp object or null XRequest.CreateXHR = function() { var xhr = null; var factory = [ function() { return new XMLHttpRequest(); }, function() { return new ActiveXObject("Msxml2.XMLHTTP"); }, function() { return new ActiveXObject("Microsoft.XMLHTTP"); } ]; for(var i = 0; i < factory.length; ++i) { var f = factory[i]; xhr = f(); if(xhr) return xhr; } return null; } XRequest.prototype.SetRequestHeader = function(name, value) { if(this.XHR) { //alert(name+'|||'+value); this.XHR.setRequestHeader(name, value); } } XRequest.prototype.SendRequest = function(args) { var async = true; var type = ""; var url = ""; var username = ""; var password = ""; var body = null; var success = null; var failure = null; for(e in args) { switch(e) { case "async": async = args[e]; break; case "type": type = args[e]; break; case "success": success = args[e]; break; case "failure": failure = args[e]; break; case "url": url = args[e]; break; case "username": username = args[e]; break; case "password": password = args[e]; break; case "body": body = args[e]; break; } } var that = this; this.XHR.onreadystatechange = function() { alert("readyState == " + that.XHR.readyState + " status == " + that.XHR.status); if(that.XHR.readyState == 4) { if(that.XHR.status == 200 || that.XHR.status == 0) { if(success) success(that.XHR); } else { if(failure) failure(); } } }; this.XHR.open(type, url, async, username, password); for(e in args) { switch(e) { case "setHeader": var h = args[e].split(":"); if(h.length == 2) { this.SetRequestHeader(h[0], h[1]); } break; } } this.XHR.send(body); } </code></pre>

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