ajaxFileUpload 上传文件/图片，传参数

html:

<script charset="utf-8" src="js/ajaxfileupload.js"></script>

<input style="display:;" type="file" id="userfile" onchange="ajaxFileUpload('userfile')" value="" name="userfile" />

Javascript:

 function ajaxFileUpload(id){
		      	  //图片格式验证
		          var x = $('#'+id);
		          if (!x || !x.val()) return;
		          var patn = /.jpg$|.jpeg$|.png$|.gif$/i;
		          if (!patn.test(x.val())) {
		              alert("您选择的不是图片");
		              x.val() = "";
		              return;
		          }
		          
		          $.ajaxFileUpload({
		              url: "upload.php",//上传的url，自己设置
		              type: 'post',secureuri: false,//一般设置为false
		              fileElementId: id,// 上传文件的id、name属性名
		              dataType: 'text',//返回值类型，一般设置为json、application/json
		              data: {'userfile':id,'time':new Date().getTime()},//传参
		              success: function (data,status) {
		                  data = data.replace(/<.*?>/g,'');
		                  var obj = eval('(' + data + ')');
		                  if(obj.url == ''){
		                  	alert(obj.msg);
		                  	return;
		                  }
		                  
		              },error: function (data,status,e) {
		                  alert('[未知错误]'+e);
		              }
		          });
		          //return false;
		      }

ajaxfileupload.js（下载：http://download.csdn.net/download/macwhirr123/9730450）

// JavaScript Document
jQuery.extend({

    createUploadIframe: function(id,uri)
 {
   //create frame
            var frameId = 'jUploadFrame' + id;
            
            if(window.ActiveXObject) {
            	if(jQuery.browser.version=="9.0") {
            		io = document.createElement('iframe');
            		io.id = frameId;
            		io.name = frameId;
            	} else if(jQuery.browser.version=="6.0"||jQuery.browser.version=="7.0"||jQuery.browser.version=="8.0") {
            		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,data)
 {
  //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);
  /*
  var oldElement = jQuery('#' + fileElementId);  
  var newElement = oldElement.clone(true);  
  newElement[0].files=oldElement[0].files;  
  oldElement.attr('id',fileId);
  oldElement.before(newElement);
  oldElement.appendTo(form);*/

 //增加文本参数的支持  
  if (data) {
      for (var i in data) {  
          $('<input type="hidden" name="' + i + '" value="' + data[i] + '" />').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 = s.fileElementId;        
  var form = jQuery.createUploadForm(id,s.fileElementId,s.data);
  var io = jQuery.createUploadIframe(id,s.secureuri);
  var frameId = 'jUploadFrame' + id;
  var formId = 'jUploadForm' + id;  
        
        if( s.global && ! jQuery.active++ )
  {
   // Watch for a new set of requests
   jQuery.event.trigger( "ajaxStart" );
  }            
        var requestDone = false;
        // Create the request object
        var xml = {};   
        if( s.global )
        {
         jQuery.event.trigger("ajaxSend",[xml,s]);
        }            
        
        var uploadCallback = function(isTimeout)
  {  
   // Wait for a response to come back 
   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)
                        var data = jQuery.uploadHttpData( xml,s.dataType );                        
                        if( s.success )
                        {
       // ifa local callback was specified,fire it and pass it the data
                         s.success( data,status );
                        };                 
                        if( s.global )
                        {
       // Fire the global callback
                         jQuery.event.trigger( "ajaxSuccess",s] );
                        };                            
                    } else
                    {
                     jQuery.handleError(s,status);
                    }
                        
                } catch(e) 
    {
                    status = "error";
                    jQuery.handleError(s,e);
                };                
                if( s.global )
                {
     // The request was completed
                 jQuery.event.trigger( "ajaxComplete",s] );
                };
                    

                // Handle the global AJAX counter
                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,e);
          }         

         },100);

                xml = null;

            };
        }
        // Timeout checker
        if( s.timeout > 0 ) 
  {
            setTimeout(function(){
                
                if( !requestDone )
                {
     // Check to see ifthe request is still happening
                 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,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;
        // ifthe type is "script",eval it in global context
        if( type == "script" )
        {
         jQuery.globalEval( data );
        }
            
        // Get the JavaScript object,ifJSON is used.
        if( type == "json" )
        {
         eval( "data = " + data );
        }
            
        // evaluate scripts within html
        if( type == "html" )
        {
         jQuery("<div>").html(data).evalScripts();
        }
            
        return data;
    },handleError: function (s,xhr,e) {
                    if (s.error) {
                        s.error.call(s.context || s,e);
                    }
                    if (s.global) {
                        (s.context ? jQuery(s.context) : jQuery.event).trigger("ajaxError",[xhr,s,e]);
                    }
                },httpData: function (xhr,type,s) {
                    var ct = xhr.getResponseHeader("content-type"),xml = type == "xml" || !type && ct && ct.indexOf("xml") >= 0,data = xml ? xhr.responseXML : xhr.responseText;
                    if (xml && data.documentElement.tagName == "parsererror")
                        throw "parsererror";
                    if (s && s.dataFilter)
                        data = s.dataFilter(data,type);
                    if (typeof data === "string") {
                        if (type == "script")
                            jQuery.globalEval(data);
                        if (type == "json")
                            data = window["eval"]("(" + data + ")");
                    }
                    return data;
                }
                
});

（编辑：李大同）

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