我想上传使用Ajax的文件，但我有麻烦处理文件... 出于测试目的，我已经建立一个简单的code，它是这样的：

I'm trying to upload a file using Ajax, but I'm having troubles handling the file... For test purposes I've build a simple code that looks like this:

记者：

xmlhttp=new XMLHttpRequest();
xmlhttp.open("POST",document.getElementById('upload').action,true);
xmlhttp.setRequestHeader("Content-type","application/x-www-form-urlencoded");
var cmdStr="q="+str;
xmlhttp.send(cmdStr);

document.getElementById("ResponseDiv").innerHTML=xmlhttp.responseText;

PHP：

$q=$_POST["q"];
echo $q;

它工作正常， xmlhttp.responseText 打印 [目标文件] 。

我的问题，然而，就是我需要用 $的临时文件名_ FILES [Q] [tmp_name的值'] 。要做到这一点，我已经改变了code以下内容：

My problem, however, is that I need to get the temporary file name with $_FILES["q"]['tmp_name']. To do so I have changed the code to the following:

记者：

xmlhttp=new XMLHttpRequest();
xmlhttp.open("POST",document.getElementById('upload').action,true);
xmlhttp.setRequestHeader("enctype","multipart/form-data");
var cmdStr="q="+str;
xmlhttp.send(cmdStr);

document.getElementById("ResponseDiv").innerHTML=xmlhttp.responseText;

PHP：

$q=$_FILES["q"]["tmp_name"];
echo $q;

问题是，现在 xmlhttp.responseText 我没有得到任何东西。 任何人都知道我在做什么错了？

Problem is that now with xmlhttp.responseText I don't get anything. Anyone knows what I'm doing wrong?

推荐答案

看看这个答案让文件上传使用AJAX。这是可能的，但在所有的浏览器不兼容。

Check out this answer for making file uploads with AJAX. It is possible, but not compatible in all browsers.

jQuery上传进度和AJAX文件上传

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另外，如果你想在飞行上传，有一个很酷的图书馆，你可以得到所谓Uploadify。这是一个闪光/ jQuery的（或HTML5现在）钻井平台，允许你上传的飞行文件。在Flash版本，我最后一次使用它...您可以在回调函数添加到让它做你想要什么本质

Alternatively, if you want on the fly uploads, there is a cool library you can get called 'Uploadify'. It's a flash/jquery (or HTML5 now) rig that allows you to upload files on the fly. In the flash version, last time I used it... you can add in callback functions to make it do essentially anything you want.

一些聪明的JavaScript可以使这项工作给你。

Some clever javascript could make this work for you.

http://www.uploadify.com/