close ALL open files and save jpg with jpg option

Hi,

I have some (a lot) of -jpg images to crop, and resize, while I have to do this one by one based on what portion of the image to crop, once done I need to close, and save them.

To speed up the process I open several files, and do the crop&resize, and when finished I use "close all", and would like to avoid to confirm the "save" dialogue, and the "jpeg options" "image quality option" dialogue, having to say save, and the option set to a given value.

Unfortunatelly I am not a coder, and didn't understand anything from the Javascript Scripting Reference guide.

I found this

app.docRef.close(SaveOptions.SAVECHANGES);

here, I pasted it into ExtendScript, saved it, but when opening the script from file > scripts > browse it returns error 21 (undefined is not an object)

Will you please kindly give me the script?

Thank you