一款完整ajax 文件上传功能，我们利用了jquery ajax上传插件来实现的，下面代码非常完整。
<html>
<head>
<style>
body{font-size:12px; bgcolor:menu;}
table{font-size:12px;}
</style>
<title></title>
<meta http-equiv="content-stype" content="text/html; charset=gb2312" />
<script type="text/网页特效" src="http://code.google.com/jquery/jquery-1.4.2.min.js"></script>
<script type="text/javascript" >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 = $('<form action="" method="post" name="' + formid + '" id="' + formid + '" enctype="multipart/form-data"></form>');
var oldelement = $('#' + fileelementid);
var newelement = $(oldelement).clone();
$(oldelement).attr('id', fileid);
$(oldelement).before(newelement);
$(oldelement).appendto(form);
//set attributes
$(form).css教程('position', 'absolute');
$(form).css('top', '-1200px');
$(form).css('left', '-1200px');
$(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);
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)
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
{
$(io).remove();
$(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 io = $('#' + frameid);
var form = $('#' + formid);
$(form).attr('action', s.url);
$(form).attr('method', 'post');
$(form).attr('target', frameid);
if(form.encoding)
{
form.encoding = 'multipart/form-data';
}
else
{
form.enctype = 'multipart/form-data';
}
$(form).submit();} catch(e)
{
jquery.handleerror(s, xml, null, e);
}
if(window.attachevent){
document.getelementbyid(frameid).attachevent('onload', uploadcallback);
}
else{
document.getelementbyid(frameid).addeventlistener('load', uploadcallback, false);
}
return {abort: function () {}};},
uploadhttpdata: function( r, type ) {
var data = !type;
data = type == "xml" || data ? r.responsexml : r.responsetext;
// if the type is "script", eval it in global context
if ( type == "script" )
jquery.globaleval( data );
// get the javascript object, if json is used.
if ( type == "json" )
eval( "data = " + data );
// evaluate scripts within html
if ( type == "html" )
jquery("<div>").html(data).evalscripts();
//alert($('param', data).each(function(){alert($(this).attr('value'));}));
return data;
}
})</script>
<script type="text/javascript">
function ajaxfileupload()
{
$("#loading")
.ajaxstart(function(){
$(this).show();
})
.ajaxcomplete(function(){
$(this).hide();
});$.ajaxfileupload
(
{
url:'do_ajax_file_upload.php教程',
secureuri:false,
fileelementid:'filetoupload',
datatype: 'json',
success: function (data, status)
{
if(typeof(data.error) != 'undefined')
{
if(data.error != '')
{
alert(data.error);
}else
{
window.opener.document.<?php echo $fromform;?>.<?php echo $fromedit;?>.value=data.msg;
alert('上传成功！');
window.close();
}
}
},
error: function (data, status, e)
{
alert(e);
}
}
)
return false;}
</script>
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