Check if image is submitted or not using node.js and multer

Question

I am able to upload images but if i need to edit my page where sometimes I need not upload a newer image, how do I proceed?

I am checking using the below code but every time its giving me "undefined".

    router.post('/update/:id', function(req, res, next) {

    var Storage = multer.diskStorage({
        destination: function (req, file, callback) {
            callback(null, "./uploads/images");
        },
        filename: function (request, file, callback) {
            callback(null, file.originalname);
        }
      });

    upload(req, res, function (err) {
      if (typeof req.files.image !== "undefined") {
        // code
      } else if (typeof req.files.image === "undefined") {
        // code
      }

    home.update(req.files[0].path, req.body.input_field_name, req.params.id);
      req.flash('edit', 'Updated.');
      res.redirect('edit/' + req.params.id);
    });

    });

Any help?

Solution

upload(req, res, function (err) {
  if (typeof req.files !== 'undefined' && req.files.length > 0) {
      //code
  } else {
      //code
  }
});

@Hartger I have included the full code. Please check. Basically, I want to check if I am uploading any image or not. In both the cases, the code must work. — , Oct 20 '17 at 09:10
what does console.log(req.files) output for you? Perhaps checking on the length of req.files would work. Are you using bodyparser btw? — Hartger, Oct 20 '17 at 09:18
@Hartger console.log(req.files) gives me "undefined". Yes, I am using "bodyparser". — , Oct 20 '17 at 09:22
Appearantly bodyparser no longer supports file uploads. See: https://stackoverflow.com/questions/23114374/file-uploading-with-express-4-0-req-files-undefined — Hartger, Oct 20 '17 at 09:25
@Hartger But I am able to upload. The problem is I need to validate whether I am uploading a file or not. As I am using multer, is there anyway to validate using multer? — , Oct 20 '17 at 09:31
@Hartger req.files and req.file, both are showing "undefined". — , Oct 20 '17 at 10:04
When you define upload, do you define it as multer().single(fieldName)? — Hartger, Oct 20 '17 at 12:54
@Hartger i am defining upload as: var upload = multer({ storage: Storage }).array("image", 1); — , Oct 23 '17 at 04:09

Manvendra Priyadarshi · Answer 1 · 2017-10-20T10:37:35.627

1

   if (typeof req.query.image !== "undefined") {
        // code
        console.log("File is uploaded");
      } else if (typeof req.query.image === "undefined") {
        // code
        console.log("File is not uploaded");
      }

//if you are using post then use - req.body.image

edited Oct 20 '17 at 10:37

answered Oct 20 '17 at 08:38

Manvendra Priyadarshi

255
3
5

Its giving me: "TypeError: Cannot read property 'image' of undefined". – Oct 20 '17 at 09:12
Install - 'npm install --save body-parser' and then add these lines in code - var bodyParser = require("body-parser"); var app = express(); app.use(bodyParser.json()); – Manvendra Priyadarshi Oct 20 '17 at 09:23
In both the cases, its going to else statement. – Oct 20 '17 at 10:07
u r using get or post – Manvendra Priyadarshi Oct 20 '17 at 10:53
i am using post – Oct 20 '17 at 10:58

Check if image is submitted or not using node.js and multer

1 Answers1