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POINVALID_STATE_ERR: DOM Exception 11
 

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    <p>I'm developing a simple auxiliary class to send requests using XmlHttpRequest (code below). But I cant make it work. At google chrome, for example, I get the error <code>INVALID_STATE_ERR: DOM Exception 11</code> and at the other browsers I get a status == 0.</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 &lt; factory.length; ++i) { var f = factory[i]; xhr = f(); if(xhr) return xhr; } return null; } XRequest.prototype.SetRequestHeader = function(name, value) { if(this.XHR) { 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; case "setHeader": var h = args[e].split(":"); if(h.length == 2) { this.SetRequestHeader(h[0], h[1]); } 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); this.XHR.send(body); } </code></pre> <p><strong>Example of usage:</strong></p> <pre><code>&lt;script language="javascript"&gt; function onLoad() { var x = XRequest.GetInstance(); x.SendRequest({type:"GET", setHeader:"Accept:text/html, image/png, image/*, */*", url: "http://your_server.com/getData?param1=test", success:onSuccess, failure:onFail }); } function onSuccess(obj) { alert("OK"); } function onFail() { alert("Not at this time!"); } &lt;/script&gt; </code></pre>
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    1. COI can't imagine why you'd bother to write something like this, except maybe for fun. This doesn't answer your question but I advise you to make that "for" loop be: "for (var e in args) ..."
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    2. COIt's not for fun. This will run in an embedded browser and the code uses http requests a lot, that's why I put it inside a class to simplify its usage. Also, the code is not complete yet!
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    3. COWell why wouldn't you just use one of the many, many open source frameworks that already provide such functionality? They've already got the bugs worked out and the cross-browser problems solved.
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