npm 强大的上传，在客户端与 JS FormData 一起使用 [英] npm Formidable Upload, use with JS FormData on client

问题描述

我想通过拖放使用 FormData 将文件发送到服务器，然后使用 Formidable 在节点中.

I wanna send a file to the server with FormData by drag and drop, and save it to disk with Formidable in node.

我使用此代码发送文件:https://github.com/felixge/node-强大#example

I used this code to send the file: https://github.com/felixge/node-formidable#example

它可以工作，我的服务器保存了数据，但我无法通过 js FormData 发送它.我写了这段代码，但它不会将接收到的数据解析为文件，而是像字段一样显示它们.代码更好地描述了这一点:

and it works, my server saves the data, but I can't send it via js FormData. I wrote this code, but it doesn't parse the received data as files, and shows them like fields. The code is describe this better:

// Client code
//inside drop event so i have files:

files = event.dataTransfer.files;
file = files[0];

reader = new FileReader();

reader.readAsArrayBuffer(file);

reader.onload = function(evt) {
    var data, fd;
    data = evt.target.result; // it's real binary data on log
    fd = new FormData;
    fd.append("foo", "bar");
    fd.append("upload", data);
    uploadImage(fd);
}

uploadImage = function(data) {
    xmlHttp.overrideMimeType("multipart/form-data");
    xmlHttp.open('post', '/upload');
    xmlHttp.send(data);
}

它工作并将数据发送到服务器，但是强大的解析方法记录如下:

It works and sends the data to the server, but formidable's parse method logs like this:

fields: {foo: 'bar', upload=''}
files: {}

推荐答案

经过多次修改，终于找到方法了！这是我的读者代码:

After lot's of changes, finally found a way! This is my reader Code:

reader.readAsArrayBuffer(file);

我更改了文件类型，从 buffer 到 Blob，它可以工作:

I changed type of file, from buffer to Blob, and it works:

arrayBufferToBlob: function(buffer, opt_contentType) {
    var uInt8Array;
    uInt8Array = new Uint8Array(buffer);
    return new Blob([uInt8Array], (opt_contentType ? {
        type: opt_contentType
    } : {}));
}

客户端代码的变化:

//Changes of Client:
fd = new FormData;
data = arrayBufferToBlob(data);
fd.append("upload", data, "FileName");

nodeJS 服务器的日志如下所示:

And log of nodeJS server looks like:

fields: {foo: 'bar'}
files: {'fileName'}

我认为 Chrome(未在其他浏览器上尝试过)HTML File 标签使用 Blob for HTML Forms 来发布...如果您有想法，请在此处告诉！

I think Chrome (not tried on other browsers) HTML File tag uses Blob for HTML Forms to post... If you had idea, tell here!

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