jnErrLevel=1;

jconstErrLevelClient = 1;
jconstErrLevelAdmin = 2;
jconstErrLevelDebug = 3;
jconstErrLevelNone = 4;

constMsgAjaxResponseErrorStatus = 'Ошибка соединения с сервером\nСтатус ответа : ';
constMsgAjaxResponseErrorEval = 'Error: eval exception.\nResponce : ';
constMsgAjaxResponseErrorCode = 'Ошибка при выполнении запроса.\nКод : ';
constMsgAjaxResponseErrorMsg = 'Ошибка : ';
constMsgAjaxResponseErrorDetail = 'Описание : ';

function jcAjax() {
  var prefixes = ["MSXML3", "MSXML2", "MSXML", "Microsoft"];
  this.xmlhttp = false;
  this.method = "GET";
  this.url = "";
  this.fcallback = null;
  this.spost = null;
  this.resp = null;
  this.ignoreParseError = false;

  var ver = navigator.appName;
  var isFF=false;
  if ( (ver.indexOf("Netscape") != -1)||(ver.indexOf("Opera") != -1)){isFF=true;}
  
  if((!this.xmlhttp) && (!isFF))
   {
     for (var i = 0; i<prefixes.length; i++) {
      try {
        this.xmlhttp = new ActiveXObject(prefixes[i] + ".XMLHTTP");
        break;
      }
      catch (e) {
        this.xmlhttp = null;
      }
     }
   }

  if (!this.xmlhttp || typeof XMLHttpRequest != 'undefined') {
    this.xmlhttp = new XMLHttpRequest();
  }
}
jcAjax.prototype = {
  
  jfAjaxRequest : function(method, url, callback, noProgress, onerror) {
    this.method = method;
    this.url = url;
    this.fcallback = callback;

    // Открыть соединение с сервером
    this.xmlhttp.onreadystatechange = function(){};
    this.xmlhttp.open(this.method, this.url, true);
    
    //this.xmlhttp.setRequestHeader("Accept-Charset", "windows-1251");
    
    if (this.method == "POST")
    {
      this.xmlhttp.setRequestHeader("Method", "POST " + this.url + " HTTP/1.1");
      this.xmlhttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
      //this.spost=encodeURIComponent(this.spost);
    }

    var xmlhttp = this.xmlhttp;
    
    this.xmlhttp.onreadystatechange = function(){
      var param;
      if (xmlhttp.readyState == 4)  {
        $('ajaxLoadingDiv').style.display = 'none';
        if(xmlhttp.status != 200) {
          if(xmlhttp.status != 0) alert(constMsgAjaxResponseErrorStatus+xmlhttp.status);
          return false;
        }
        var resp = xmlhttp.responseText;
        //xmlhttp.abort();
        xmlhttp = null;

        try {
//console.log (resp);          
param = eval(resp)[0];
        } catch (e) {
          if(!this.ignoreParseError){
            alert(constMsgAjaxResponseErrorEval + resp);
            return false;
          }
          else{
            setTimeout(function(){ callback(false); },1);
            return;
          }
        };
        
        if(param.errcode){
                    var err= param.errdescription;
                    alert(err);
          if(jfGetInt(param.errcode)==666){
            document.location.href = '/logout.php';
          }
          if(onerror) setTimeout(function(){ onerror(param); },1);
          return false;
        }
        //callback(param);
        setTimeout(function(){ callback(param); },1);
      }
    };
    
    if (!noProgress) {
      $('ajaxLoadingDiv').style.top = Math.round(ScreenUtils.getHeight() / 2 + ScreenUtils.getScrollTop()) + 'px';
      $('ajaxLoadingDiv').style.display = 'block';
    }

    // Передать запрос
    this.xmlhttp.send(this.spost);
    return true;
  },
  
  jfAjaxCancel: function() {
      if(this.xmlhttp) {
        this.xmlhttp.abort();
      }
      return true;
    },

  //FILES UPLOAD
  iFrameRequest: function(rs, formID, callback,noProgress) {
    this.url = rs;
    this.fcallback = callback;
    
    this.getIFrame();
    this.getIForm(formID);
    
    var thisObj = this;

    if (!noProgress) {
      $('ajaxLoadingDiv').style.top = Math.round(ScreenUtils.getHeight() / 2 + ScreenUtils.getScrollTop()) + 'px';
      $('ajaxLoadingDiv').style.display = 'block';
    }    

    thisObj.getIForm().submit();
    return true;
  },
  
  iRunCallBack: function(){
    var thisObj = this;
    $('ajaxLoadingDiv').style.display = 'none';
    
    if($('ajax_cb').value == ''){return;}
    
    var resp = $('ajax_cb').value;
    try {
      param = eval(resp)[0];
    } catch (e) {
      alert(constMsgAjaxResponseErrorEval + resp);
      return false;
    };
    
    if(param.errcode){
      var err=constMsgAjaxResponseErrorCode+param.errcode;
      err=err+"\n"+constMsgAjaxResponseErrorMsg+param.errdescription;
      if(jnErrLevel!=jconstErrLevelClient) {
      err=err+"\n"+constMsgAjaxResponseErrorDetail+param.errdetail;
    }
    alert(err);
    return false;
    }
    this.fcallback(param);    
    
    return;
  },
  
  getIFrame: function() {
    if (!this.iframe) {
      this.iframe = $('ajax_loading_ifarme');   
    }
    return this.iframe;
  },

  getIForm: function(id) {
    if(id){
      this.iform = $(id);
      this.iform.target = this.getIFrame().id;
      this.iform.action = this.url;
      this.iform.setAttribute('target', this.getIFrame().id);
      this.iform.setAttribute('action', this.url);    
    }
    return this.iform;
  }  
  
}

var objAjax = new jcAjax();