Question

我收到了mainimage的未定义错误任何人都可以帮我解决这个错误事情是图像上传并从时间戳重命名但它没有工作请帮助

这是app.js route

var express = require('express');
var path = require('path');
var favicon = require('serve-favicon');
var logger = require('morgan');
var expressValidator = require('express-validator');
var cookieParser = require('cookie-parser');
var session = require('express-session');
var bodyParser = require('body-parser');
var mongo = require('mongodb');
var db = require('monk')('localhost/nodeblog');
var multer = require('multer');
var flash = require('connect-flash');

var routes = require('./routes/index');
var posts = require('./routes/posts');
var categories = require('./routes/categories');


    var app = express();

app.locals.moment = require('moment');

// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'jade');

// Handle File Uploads
app.use(multer({dest:'./public/images/uploads'}).single('mainimage'));

// uncomment after placing your favicon in /public
//app.use(favicon(path.join(__dirname, 'public', 'favicon.ico')));
app.use(logger('dev'));
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: false }));
app.use(cookieParser());

// Handle Express Sessions
app.use(session({
  secret:'secret',
  saveUninitialized:true,
  resave:true
}));

// Express Validator
app.use(expressValidator({
  errorFormatter: function(param, msg, value) {
      var namespace = param.split('.')
      , root    = namespace.shift()
      , formParam = root;

    while(namespace.length) {
      formParam += '[' + namespace.shift() + ']';
    }
    return {
      param : formParam,
      msg   : msg,
      value : value
    };
  }
}));

app.use(express.static(path.join(__dirname, 'public')));

// Connect-flash
app.use(flash());
 app.use(function (req, res, next) {
  res.locals.messages = require('express-messages')(req, res);
  next();
});

// Make our database accessible to our router
app.use(function(req, res, next){
  req.db = db;
  next();
})

app.use('/', routes);
app.use('/posts', posts);
app.use('/categories', categories);

// catch 404 and forward to error handler
app.use(function(req, res, next) {
  var err = new Error('Not Found');
  err.status = 404;
  next(err);
});

// error handlers

// development error handler
// will print stacktrace
if (app.get('env') === 'development') {
  app.use(function(err, req, res, next) {
    res.status(err.status || 500);
    res.render('error', {
      message: err.message,
      error: err
    });
  });
}

// production error handler
// no stacktraces leaked to user
app.use(function(err, req, res, next) {
  res.status(err.status || 500);
  res.render('error', {
    message: err.message,
    error: {}
  });
});


module.exports = app;

这是post.js路线代码

var express = require('express');
var router = express.Router();
var mongo = require('mongodb');
var db = require('monk')('localhost/nodeblog');

router.get('/add', function(req, res, next){
    var categories = db.get('categories');

    categories.find({},{},function(err, categories){
        // console.log(categories);

        res.render('addpost',{
        "title":"Add Post",
        "categories": categories
        });
    });
});

router.post('/add', function(req, res, next){
    // GET FORM VALUES
    var title       = req.body.title;
    var category    = req.body.category;
    var body        = req.body.body;
    var author      = req.body.author;
    var date        = new Date();

    console.log(req.file);
    console.log(req.file.mainimage)
    if(req.file.mainimage){
        var mainImageOriginalName   = req.file.mainimage.originalname;
        var mainImageName           = req.file.mainimage.filename;
        var mainImageMime           = req.file.mainimage.mimetype;
        var mainImagePath           = req.file.mainimage.path;
        var mainImageExt            = req.file.mainimage.extension;
        var mainImageSize           = req.file.mainimage.size;
        // console.log(mainImageName);
    } else{
        var mainImageName = 'noimage.png';
        console.log(mainImageName);
    }

    // FORM VALIDATION
    req.checkBody('title','Title field is required').notEmpty();
    req.checkBody('body','Body field is required');

    // Check Errors
    var errors = req.validationErrors();

    if(errors){
        res.render('addpost',{
            "errors":errors,
            "title":title,
            "body":body
        });
    } else {
        var posts = db.get('posts');

        // SUBMIT TO DB
        posts.insert({
            "title":title,
            "body":body,
            "category":category,
            "date":date,
            "author":author,
            "mainimage":mainImageName
        }, function(err, post){
            if(err){
                res.send('There is an issue submiting the post');
            } else {
                req.flash('Success','Post submitted');
                res.location('/');
                res.redirect('/');
            }
        });
    }
});

module.exports = router;

这是addpost.jade文件

extends layout

block content
    h1=title
    ul.errors
        if errors
            each error, i in errors
                li.alert.alert-danger #{error.msg}
    form(method='post', action='/posts/add', enctype="multipart/form-data")
        .form-group
            label Title:
            input.form-control(name='title', type='text')
        .form-group
            label Category
            select.form-control(name='category')
                each category, i in categories
                    option(value='#{category.title}') #{category.title}
        .form-group
            label Body
            textarea.form-control(name=body, id='body')
        .form-group
            label Main Image:
            input.form-control(name='mainimage',type='file')
        .form-group
            label Author:
            select.form-control(name='author')
                option(value='Ankit Baid') Ankit Baid
                option(value='John Doe') John Doe
        input.btn.btn-default(name='submit' type='submit', value='Save')
    script(src='/ckeditor/ckeditor.js')
    script
        | CKEDITOR.replace('body');

Answer 1

您需要删除刚才需要mainimage的属性req.file：

if(req.file){
    var mainImageOriginalName   = req.file.originalname;
    var mainImageName           = req.file.filename;
    var mainImageMime           = req.file.mimetype;
    var mainImagePath           = req.file.path;
    var mainImageExt            = req.file.extension;
    var mainImageSize           = req.file.size;
    // console.log(mainImageName);
} else{
    var mainImageName = 'noimage.png';
    console.log(mainImageName);
}

Answer 2

您是否正在使用Udemy Node项目系列？您的代码看起来与我的相似，我也坚持使用multer文件上传。你在上传目录中看到文件了吗？

上传目录中有文件供我使用。但是当我检查我的mongodb时，图像部分是空白的。

Node.js Multer文件上传错误

2 个答案: