jQuery.extend({
 createUploadIframe: function(id, uri)
 {
  //create frame
  var frameId = 'jUploadFrame' + id;
  var iframeHtml = '<iframe id="' + frameId + '" name="' + frameId + '" style="position:absolute; top:-9999px; left:-9999px"';
  if(window.ActiveXObject)
  {
   if(typeof uri== 'boolean'){
    iframeHtml += ' src="' + 'javascript:false' + '"';
 
   }
   else if(typeof uri== 'string'){
    iframeHtml += ' src="' + uri + '"';
 
   } 
  }
  iframeHtml += ' />';
  jQuery(iframeHtml).appendTo(document.body);
 
  return jQuery('#' + frameId).get(0);   
 },
 createUploadForm: function(id,fileElementId,data,fileElement)
 {
  //create form 
  var formId = 'jUploadForm' + id;
  var fileId = 'jUploadFile' + id;
  var form = jQuery('<form action="" method="POST" name="' + formId + '" id="' + formId + '" enctype="multipart/form-data"></form>'); 
  if(data)
  {
   for(var i in data)
   {
    jQuery('<input type="hidden" name="' + i + '" value="' + data[i] + '" />').appendTo(form);
   }   
  }
  var oldElement;
  if(fileElement == null)
   oldElement = jQuery('#' + fileElementId);
  else
   oldElement = fileElement;
   
  var newElement = jQuery(oldElement).clone();
  jQuery(oldElement).attr('id', fileId);
  jQuery(oldElement).before(newElement);
  jQuery(oldElement).appendTo(form);
   
  //set attributes
  jQuery(form).css('position', 'absolute');
  jQuery(form).css('top', '-1200px');
  jQuery(form).css('left', '-1200px');
  jQuery(form).appendTo('body');  
  return form;
 },
 
 ajaxFileUpload: function(s) {
  // TODO introduce global settings, allowing the client to modify them for all requests, not only timeout  
  s = jQuery.extend({}, jQuery.ajaxSettings, s);
  var id = new Date().getTime()  
  var form = jQuery.createUploadForm(id, s.fileElementId, (typeof(s.data)=='undefined'?false:s.data),s.fileElement);
  var io = jQuery.createUploadIframe(id, s.secureuri);
  var frameId = 'jUploadFrame' + id;
  var formId = 'jUploadForm' + id;  
  // Watch for a new set of requests
  if ( s.global && ! jQuery.active++ )
  {
   jQuery.event.trigger( "ajaxStart" );
  }   
  var requestDone = false;
  // Create the request object
  var xml = {} 
  if ( s.global )
   jQuery.event.trigger("ajaxSend", [xml, s]);
  // Wait for a response to come back
  var uploadCallback = function(isTimeout)
  {   
   var io = document.getElementById(frameId);
   try
   {    
    if(io.contentWindow)
    {
      xml.responseText = io.contentWindow.document.body?io.contentWindow.document.body.innerHTML:null;
      xml.responseXML = io.contentWindow.document.XMLDocument?io.contentWindow.document.XMLDocument:io.contentWindow.document;
      
    }else if(io.contentDocument)
    {
      xml.responseText = io.contentDocument.document.body?io.contentDocument.document.body.innerHTML:null;
     xml.responseXML = io.contentDocument.document.XMLDocument?io.contentDocument.document.XMLDocument:io.contentDocument.document;
    }      
   }catch(e)
   {
    jQuery.handleError(s, xml, null, e);
   }
   if ( xml || isTimeout == "timeout") 
   {    
    requestDone = true;
    var status;
    try {
     status = isTimeout != "timeout" ? "success" : "error";
     // Make sure that the request was successful or notmodified
     if ( status != "error" )
     {
      // process the data (runs the xml through httpData regardless of callback)
      console.log( jQuery.uploadHttpData);
      var data = jQuery.uploadHttpData(xml,s.dataType ); 
      // If a local callback was specified, fire it and pass it the data
      if ( s.success )
       s.success( data, status );
  
      // Fire the global callback
      if( s.global )
       jQuery.event.trigger( "ajaxSuccess", [xml, s] );
     } else
      jQuery.handleError(s, xml, status);
    } catch(e) 
    {
     status = "error";
     jQuery.handleError(s, xml, status, e);
    }
 
    // The request was completed
    if( s.global )
     jQuery.event.trigger( "ajaxComplete", [xml, s] );
 
    // Handle the global AJAX counter
    if ( s.global && ! --jQuery.active )
     jQuery.event.trigger( "ajaxStop" );
 
    // Process result
    if ( s.complete )
     s.complete(xml, status);
 
    jQuery(io).unbind()
 
    setTimeout(function()
         { try
          {
           jQuery(io).remove();
           jQuery(form).remove(); 
            
          } catch(e) 
          {
           jQuery.handleError(s, xml, null, e);
          }         
 
         }, 100)
 
    xml = null
 
   }
  }
  // Timeout checker
  if ( s.timeout > 0 ) 
  {
   setTimeout(function(){
    // Check to see if the request is still happening
    if( !requestDone ) uploadCallback( "timeout" );
   }, s.timeout);
  }
  try
  {
 
   var form = jQuery('#' + formId);
   jQuery(form).attr('action', s.url);
   jQuery(form).attr('method', 'POST');
   jQuery(form).attr('target', frameId);
   if(form.encoding)
   {
    jQuery(form).attr('encoding', 'multipart/form-data');    
   }
   else
   { 
    jQuery(form).attr('enctype', 'multipart/form-data');   
   }   
   jQuery(form).submit();
 
  } catch(e) 
  {   
   jQuery.handleError(s, xml, null, e);
  }
   
  jQuery('#' + frameId).load(uploadCallback);
  return {abort: function(){
   try
   {
    jQuery('#' + frameId).remove();
    jQuery(form).remove();
   }
   catch(e){}
  }};
 },
 
 uploadHttpData: function( r, type ) {
  var data ="";
  data = (type == "xml" ? r.responseXML : r.responseText);
  if ( type == "script" )
   jQuery.globalEval( data );
  /**
   * auth garen 2016-06-17
   * 对文件上传后的响应结果进行处理，支持IE FF GC
   * */
  if ( type == "json" ){
   var reg ="";
   if(data.indexOf("<pre>")>-1){
    reg=/<pre>(.+)<\/pre>/g;
   }else{    
    reg=/<pre.+?>(.+)<\/pre>/g; 
   }
   var result = data.match(reg);
   var stri1=RegExp.$1; 
    if(stri1!=null&&stri1!="" &&stri1.trim().length>0){
     data = stri1;   
    }
   eval( "data =" + data);
  }
  if ( type == "html" )
   jQuery("<div>").html(data).evalScripts();
  return data;
 },
  
 handleError: function( s, xml, status, e ) {
  // If a local callback was specified, fire it
  if ( s.error )
   s.error( xml, status, e );
 
  // Fire the global callback
  if ( s.global )
   jQuery.event.trigger( "ajaxError", [xml, s, e] );
 }
});