/* Simple AJAX Code-Kit (SACK) v1.5 */
/* www.twilightuniverse.com */
/* Software licenced under a modified X11 licence,
   see documentation or authors website for more details */

function sack(file){
        this.xmlhttp = null;
        this.AjaxFailedAlert = "Your browser does not support the enhanced functionality of this website, and therefore you will have an experience that differs from the intended one.\n";

        this.resetData = function() {
                this.method = "POST";
                  this.URLString = "";
                  this.encodeURIString = true;
                  this.execute = false;
                  this.element = null;
                this.elementObj = null;
                this.requestFile = file;
                this.vars = new Object();
                this.responseStatus = new Array(2);
          }

        this.resetFunctions = function() {
                  this.onLoading = function() { };
                  this.onLoaded = function() { };
                  this.onInteractive = function() { };
                  this.onCompletion = function() { };
                  this.onError = function() { };
        }

        this.reset = function() {
                this.resetFunctions();
                this.resetData();
        }

        this.reset(); /* setup defaults, using the same method that could reset them later. */

        this.createAJAX = function() {
                try {
                        this.xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
                } catch (e) {
                        try {
                                this.xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
                        } catch (err) {
                                this.xmlhttp = null;
                        }
                }
                if(!this.xmlhttp && typeof XMLHttpRequest != "undefined")
                        this.xmlhttp = new XMLHttpRequest();
                if (!this.xmlhttp){
                        this.failed = true;
                }
        };

        this.setVar = function(name, value){
                this.vars[name] = Array(value, false);
        }

        this.encVar = function(name, value, returnvars){
                if(true == returnvars){
                        return Array(encodeURIComponent(name), encodeURIComponent(value));
                } else {
                        this.vars[encodeURIComponent(name)] = Array(encodeURIComponent(value), true);
                }
        }

        this.processURLString = function(string, encode){
                varArray = string.split('&');
                for (i = 0; i < varArray.length; i++){
                        urlVars = varArray[i].split('=');
                        if (urlVars[0].indexOf('amp;') != -1){
                                urlVars[0] = urlVars[0].substring(4);
                        }
                        if (true == encode){
                                this.encVar(urlVars[0],urlVars[1]);
                        } else {
                                this.setVar(urlVars[0],urlVars[1]);
                        }
                }
        }

        this.createURLString = function(urlstring){ // near done!
                var timeval = new Date().getTime();

                if (this.encodeURIString && this.URLString){
                        this.processURLString(this.URLString, true);
                }
                if (urlstring){
                        if (this.URLString.length){
                                this.URLString = this.URLString + "&" + urlstring;
                        } else {
                                this.URLString = urlstring;
                        }
                }

                this.setVar("rndval", timeval); //prevents caching of URLString.

                for (key in this.vars){ //First Loop: Vars are encoded if needed.
                            if (false == this.vars[key][1] && true == this.encodeURIString){
                                var encoded = this.encVar(key, this.vars[key][0], true);
                                delete this.vars[key];
                                this.vars[encoded[0]] = Array(encoded[1], true);
                            }
                }
                var i = 0;
                for (key in this.vars){ //Second Loop: Creates URLString from vars.
                        if (i != 0){
                                    this.URLString += "&" + key + "=" + this.vars[key][0];
                            } else {
                                    this.URLString += key + "=" + this.vars[key][0];
                            }
                            i++;
                }
        }

        this.runResponse = function(){
                eval(this.response);
        }

        this.runAJAX = function(urlstring){
                if(this.failed && this.AjaxFailedAlert){
                        alert(this.AjaxFailedAlert);
                } else {
                        this.createURLString(urlstring);
                        if (this.element) { this.elementObj = document.getElementById(this.element); }
                        if (this.xmlhttp) {
                                var self = this;
                                if (this.method == "GET") {
                                        var totalurlstring = this.requestFile + "?" + this.URLString;
                                        this.xmlhttp.open(this.method, totalurlstring, true);
                                } else {
                                        this.xmlhttp.open(this.method, this.requestFile, true);
                                }
                                if (this.method == "POST"){
                                          try {
                                                this.xmlhttp.setRequestHeader('Content-Type','application/x-www-form-urlencoded')
                                        } catch (e) {}
                                }

                                this.xmlhttp.onreadystatechange = function() {
                                        switch (self.xmlhttp.readyState){
                                                case 1:
                                                        self.onLoading();
                                                break;
                                                case 2:
                                                        self.onLoaded();
                                                break;
                                                case 3:
                                                        self.onInteractive();
                                                break;
                                                case 4:
							self.response = self.xmlhttp.responseText;
                                                        self.responseXML = self.xmlhttp.responseXML;
                                                        self.responseStatus[0] = self.xmlhttp.status;
                                                        self.responseStatus[1] = self.xmlhttp.statusText;
                                                        if(self.execute){ self.runResponse(); }
                                                     /*if (self.elementObj) {
                                                                var elemNodeName = self.elementObj.nodeName;
                                                                elemNodeName.toLowerCase();
                                                                if (elemNodeName == "input" || elemNodeName == "select" || elemNodeName == "option" || elemNodeName == "textarea"){
                                                                        self.elementObj.value = self.response;
                                                                } else {
                                                                        self.elementObj.innerHTML = self.response;
                                                                }
                                                        }*/
                                                        if ("200" == self.responseStatus[0]){
                                                                self.onCompletion();
                                                        } else if(navigator.userAgent.indexOf("Firefox")!=-1) {
                                                                self.onError();
                                                        }
                                                        self.URLString = "";
                                                break;
                                        }
                                };
                                this.xmlhttp.send(this.URLString);
                        }
                }
        };
this.createAJAX();
}



var ajax = new sack();

function whenLoading(){
        var e = document.getElementById('status');
	e.innerHTML = "<p>Отправляем данные...</p>";
}
function whenLoaded(){
        var e = document.getElementById('status');
        e.innerHTML = "<p>Данные отправлены</p>";
}
function whenInteractive(){
        var e = document.getElementById('status');
        e.innerHTML = "<p>Получаем данные...</p>";
}