Can a Java applet open a “select directory” and write to a filesystem via JavaScript interaction?

Question

I am looking for a way to save a couple of files created with JavaScript on the clients computer. I want him to be able to choose a folder (similar to open/save folder dialog),

Answer 1

It is possible with a signed applet.

I'd probably do it the other way around, let the javascript code pass all the data to the applet and the applet should open a FileDialog and write the file.

Calling javascript from java can be achieved via `JSObject, calling Java from Javascript is explained here