Dropzone JS Change Filename Before Upload

Question

I'm using Dropzone.js to handle uploading of files. I would really like to be able to modify the original name of the file before uploading it to S3. It would be nice to just be able to use dropzone's processing file hook like shown below, but it appears none of the changes I make to this file object persist...

myDropone.on('processingfile', function(file) {
  console.log(file.name) // 'Randy.png'
  file.name = 'my-custom-name.png';
  console.log(file.name) // 'Randy.png'
});

Even when trying to modify this File object in the console changes do not persist. I'm losing my mind...

Does anyone see what I'm missing here? Or is there a better way to modify the name of a file before uploading it with Dropzone?

Answer 1

File is a HTML 5 file object, and some of it's properties is read-only as you can see here

But, you can set a new property for your file object like:

myDropone.on("sending", function(file) {
    file.myCustomName = "my-new-name" + file.name;
    console.log(file.myCustomName);
});

Edit: Also, the documentation says, the recommended way to send aditional params in the body of the post action is:

myDropzone.on("sending", function(file, xhr, formData) {
     // Will send the filesize along with the file as POST data.
     formData.append("filesize", file.size);
     formData.append("fileName", "myName");
});

Hope it helps.