How to automatically save files on lose focus in Emacs

Question

Is it possible to configure Emacs, so that it saves all files when the emacs window loses focus?

Answer 1

[…] the feature I am talking about is from Scribes. It is very convient when editing html and the like, you don't have to press C-x C-s anymore, you just change the window and check your browser.

In that case, instead of switching to the browser application, order Emacs to load the browser application (C-c C-v or M-x browse-url-of-buffer). With this method, you can write your own function that saves the buffer and then brings the browser up, like:

(defun my-browse-url-of-buffer ()
  "Save current buffer and view its content in browser."
  (interactive)
  (save-buffer)
  (browse-url-of-buffer))

And hook it to a convenient binding.

Or you can still use the html-autoview-mode that each time you saves the buffer, automatically loads the file into your favorite browser.