Build a Markdown Previewer - FileReader - a little help?

JavaScript
1

hi All,

I’m busy trying to build my markdown previewer but i’m finding it difficult to read a .txt file from dropbox into a text area. I started with the following code:

var reader = new FileReader();
var file= “Sign up to view this shared folder”;
var text = reader.readAsText(file);
document.getElementById(‘displayArea’).innerHTML = text;

but i’m getting the following error:
Uncaught TypeError: Failed to execute ‘readAsText’ on ‘FileReader’: parameter 1 is not of type ‘Blob’.

I’ve been reading the documentation but i’m not getting any wiser.
Could someone tell me what i have to do with the url/file to make it a blob type or maybe point me to another source where i can learn more about using the FileReader API.

Thanks alot,
cheers,
Justin

2

FileReader is for local files only. So you would first need to read the file with fetch API. Also have in mind that you maybe need to use a CORS proxy.

Hopefully this points you into the right direction.

3

ok. thanks Daniel.
I’ll start reading up on those things now. cheers