express multer无法读取未定义的属性"profileimage" [英] express multer Cannot read property 'profileimage' of undefined

问题描述

我正在尝试提交一个表单，其中包含一个名称为profileimage的文件输入，我正在使用express 4，express generator和multer.

I am trying to submit a form which has a file input within it with a name of profileimage, i am using express 4, express generator and multer.

在我的app.js中，我像这样添加了multer:

In my app.js I added multer like so:

var multer = require('multer');
var upload = multer({ dest: './uploads' });

我要遵循的教程实际上设置了multer，就像这样(在需要它之后)，但是它给了我一个错误:

The tutorial i am following actually sets up multer like so (after requiring it) but it gives me an error:

app.use(multer({dest: './uploads'}));

在相应文件内的routes文件夹中，我具有以下内容:

And in my routes folder inside the respective file I have the following:

router.post('/register', function(req, res, next) {
// get form values
var name = req.body.name;
var email = req.body.email;
var username = req.body.username;
var password = req.body.password;
var password2 = req.body.password2;

// check for image field
if (req.files.profileimage)
{
    console.log('Uploading file...');
...

但是，当我提交表单时，出现以下错误:

However when I submit the form I get the following error:

Cannot read property 'profileimage' of undefined

似乎无法理解req.files.profileimage，但是我不知道为什么?

It seems to not be able to understand req.files.profileimage, but I don't know why?

推荐答案

multer的API不久前发生了变化，因此那里的一些教程仍然使用旧的API.

The API for multer changed a bit some time ago, so some tutorials out there still use the old API.

对于单个文件，您将执行以下操作:

For a single file, you would do something like:

var uploads = multer({dest: './uploads'});

// ...

router.post('/register', uploads.single('profileimg'), function(req, res, next) {

   // ...

   if (req.file) {
     console.log('Profile image uploaded');
   }
});

有关其他情况的更多示例，请参见 multer文档

See the multer documentation for more examples of other scenarios.

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