How to detect file extension with javascript FileReader

Question

I\'m using javascript\'s FileReader and my customized function for reading an JPG-JPEG image, My problem is that how it\'s possible to detect the file extension through my c

Answer 1

There's not a direct interface to read the file extension. You have at least 2 options:

• Use a regex to extract the extension from the filename
• Use the content type of the file as your filter

For the extension method it'd be something like:

var extension = fileName.match(/\.[0-9a-z]+$/i);