// 本系统由UQCMS.COM云商提供技术支持
// JavaScript Document 上传插件
jQuery.extend({
	createUploadIframe: function(id, uri){
  		//create frame
		var frameId = 'jUploadFrame' + id; 
		if(window.ActiveXObject){
			var io = document.createElement('<iframe id="' + frameId + '" name="' + frameId + '" />');
			if(typeof uri== 'boolean'){
				io.src = 'javascript:false';
			}else if(typeof uri== 'string'){
				io.src = uri;
			}
		}else{
			var io = document.createElement('iframe');
			io.id = frameId;
			io.name = frameId;
		}
		io.style.position = 'absolute';
		io.style.top = '-1000px';
		io.style.left = '-1000px';
		document.body.appendChild(io);
		return io;   
    },
    createUploadForm: function(id, fileElementId){
		//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>'); 
		var oldElement = jQuery('#' + fileElementId);
		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) { 
		s = jQuery.extend({}, jQuery.ajaxSettings, s);
		var id = s.fileElementId;        
		var form = jQuery.createUploadForm(id, s.fileElementId);
		var io = jQuery.createUploadIframe(id, s.secureuri);
		var frameId = 'jUploadFrame' + id;
		var formId = 'jUploadForm' + id;
        if( s.global && ! jQuery.active++ ){ 
		   jQuery.event.trigger( "ajaxStart" );
  		}            
        var requestDone = false; 
        var xml = {};   
        if(s.global){
         	jQuery.event.trigger("ajaxSend", [xml, s]);
        }
        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"; 
					if(status != "error"){ 
						var data = jQuery.uploadHttpData(xml, s.dataType);                        
						if(s.success){
							s.success( data, status );
						};                 
						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);
				};                
				if(s.global){
					jQuery.event.trigger("ajaxComplete", [xml, s]);
				}; 
				if(s.global && ! --jQuery.active){
					jQuery.event.trigger("ajaxStop");
				};
				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;
			};	
		}
		if(s.timeout > 0){
			setTimeout(function(){ 
				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){
				form.encoding = 'multipart/form-data';    
			}else{    
				form.enctype = 'multipart/form-data';
			}   
			jQuery(form).submit();
			
		}catch(e){   
			jQuery.handleError(s, xml, null, e);
		}
		if(window.attachEvent){
			document.getElementById(frameId).attachEvent('onload', uploadCallback);
		}else{
			document.getElementById(frameId).addEventListener('load', uploadCallback, false);
		}   
		return {
			abort: function () {
				// 
			}
		};
	}, 
	uploadHttpData: function(r, type) {
		var data = !type;
		data = type == "xml" || data ? r.responseXML : r.responseText; 
		if(type == "script"){
			jQuery.globalEval( data );
		} 
		if( type == "json" ){
			eval( "data = " + data );
		} 
		if( type == "html" ){
			jQuery("<div>").html(data).evalScripts();
		}
		return data;
	}
});
