PC World Komputer 2010 April/PCWorld0410.iso/pluginy Firefox/8206/8206.xpi/content/rss/request.js

Text File | 2010-02-02 | 4.3 KB | 186 lines

function WiseStampCreateXMLHttpRequest()
{
    var xmlhttp = new XMLHttpRequest();

    return {
        xmlhttp: xmlhttp,
        readyState: 0,
        responseXML: null,
        responseText: "",
        onsuccess: null,
        onfailure: null,
        url: "",
        sent: "",
        async: 1,
        onsuccesscalled: false,

        makeOnReadyStateChangeHandler: function ()
        {
            var obj = this;
            return function ()
            {
                obj.readyState = obj.xmlhttp.readyState;

                if (obj.xmlhttp.readyState == 4)
                {
                    var status = '';

                    try
                    {
                        status = obj.xmlhttp.status;
                    } catch(e)
                    {
                        obj.onerror(e);
                        return;
                    };

                    if (status == 200)
                    {
                        //WiseStampUtils.log("request.js :: makeOnReadyStateChangeHandler :: status = 200, obj.xmlhttp.responseText = " + obj.xmlhttp.responseText);

                        obj.responseXML = obj.xmlhttp.responseXML;
                        obj.responseText = obj.xmlhttp.responseText;

                        if (obj.onsuccess)
                        {
                            obj.onsuccesscalled = true;
                            obj.onsuccess();
                        };
                    };
                };

                obj.onreadystatechange();
            };
        },

        makeOnErrorHandler: function ()
        {
            var obj = this;

            return function (e)
            {
                obj.xmlhttp = new XMLHttpRequest();
                obj.xmlhttp.onerror = function ()
                {
                    obj.onfailure();
                };
                obj.xmlhttp.onreadystatechange = obj.makeOnReadyStateChangeHandler();
                obj.xmlhttp.open(obj._open.method, obj._open.url, obj._open.mode);
                obj.xmlhttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
                obj.xmlhttp.send(obj.sent);
            };
        },

        onreadystatechange: function ()
        {},

        open: function (method, url, mode)
        {
            this._open =
            {
                method: method,
                url: url,
                mode: mode
            };

            var obj = this;

            this.onerror = this.makeOnErrorHandler();
            this.xmlhttp.onerror = this.makeOnErrorHandler();
            this.xmlhttp.onreadystatechange = this.makeOnReadyStateChangeHandler();

            var ts = new Date;
            if (url.indexOf('?') == -1)
            {
                url = url + "?_ts=" + ts.getTime();
            } else
            {
                url = url + "&_ts=" + ts.getTime();
            };

            this.url = url;
            this.async = mode;

            this.xmlhttp.open(method, url, mode);
            this.xmlhttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
        },

        send: function (data)
        {
            this.sent = data;

            this.xmlhttp.overrideMimeType("text/xml");
            this.xmlhttp.send(data);

            // There's a difference in FF and IE behavior:
            // IE calls onreadystatechange even foe non-async requests,
            // while FF doesn't; thus, the following condition a
            // a workaround for FF behavior
            if (!this.async && !this.onsuccesscalled && this.xmlhttp.readyState == 4)
            {
                this.responseXML = this.xmlhttp.responseXML;
                this.responseText = this.xmlhttp.responseText;
                this.onsuccesscalled = true;
                if (this.onsuccess)
                {
                    this.onsuccess();
                };
            };
        },

        handleError: function (callbacks)
        {
            // FireFox bug workaround;
            // sometimes FF (up to 1.5.0.1) XMLHTTPRequest object
            // returns empty response body whatever the actual response was
            // (when calling from the FCKEditor event handler).
            if (this.xmlhttp.responseText == "" && this.xmlhttp.responseXML == null)
            {
                return false;
            };

            if (!this.xmlhttp.responseXML)
            {
                alert("Error; server responded with '" + this.xmlhttp.responseText + "'");
                return true;
            };

            if (!this.xmlhttp.responseXML.documentElement)
            {
                alert("Error; server responded with '" + this.xmlhttp.responseText + "'");
                return true;
            };

            if (this.xmlhttp.responseXML.documentElement.tagName == "parsererror")
            {
                alert("Error; server responded with '" + this.xmlhttp.responseText + "'");
                return true;
            };

            var root = this.xmlhttp.responseXML.documentElement;
            if (root.tagName == 'error')
            {
                var handler = null;
                var code = root.getAttribute('code');
                var text = root.text ? root.text : root.textContent;

                if (callbacks != null)
                {
                    handler = callbacks[code];
                };

                if (handler)
                {
                    return handler(code, text);
                } else
                {
                    var query_text = this.sent.replace(/&/g, "\n");
                    alert("ERROR: " + code + " " + text + "\n" + query_text);
                    return true;
                };
            };

            return false;
        }
    }
};