Using Javascript is it possible to listen for browser's file open/save dialog box event. I want to perform an action when I am notified that the save file dialog box has opened now. Specifically I want to hide a loading spinner when dialog box opens (but this could very well be any other action )

I believe I can do that for a dialog box that I create, not sure if it can be done for the browser's standard dialog box.

Any pointers for that would be really helpful.