Nowadays I often insert @Online entries into my bibliography files.

Unfortunately, the RefTeX doesn't have the Online-Entry bound to any key by default.

I tried to add something like

;; I often use the "@Online" entry in my bibliographies.
;; Unfortunately, no key binding was defined by default.  I think C-c
;; C-e C-o would be a good choice and is still unused.
(define-key reftex-mode-map (kbd "C-c C-e C-O") 'bibtex-Online)

Running eval-last-sexp (bound to C-xC-e) gave no error, but said bibtex-Online as expected.

What is my mistake?


After having Emacs restarted, the key binding worked, but unfortunately (again!) not in a buffer with a bibliography file! I was working on my LaTeX file and when I tried to insert a new environment by pressing C-cC-e, but instead of asking which environment I was about to insert, Emacs waited for the next keypress an ah voilà, after completing the session with C-o Emacs most happily inserted an template for an Online document (@Online{...}) into my LaTeX buffer. Yet, still, the key binding didn't work in the bibliography buffer :-(

  • Reg. your sentence: I think C-c C-e C-o would be a good choice and is still unused. From Emacs lisp manual: Don't define C-c letter as a key in Lisp programs. Sequences consisting of C-c and a letter (either upper or lower case) are reserved for users; they are the only sequences reserved for users, so do not block them. Dec 7, 2019 at 21:48
  • @ArashEsbati I consider myself a user, but your hint doesn't apply.. Quoting from your quote: "C-c and a letter (either upper or lower case)" would match e.g. C-c o or C-c O. But I used C-c C-e C-o, which shouldn't match? At least, I choose it, as all of the bibliography entries are starting with C-c C-e as a prefix. So i guess, it can't be that false?
    – Jan
    Dec 8, 2019 at 11:22
  • My hint was meant to say: Stay in the user realms with keybindings. Or approach bibtex maintainer to possibly add your binding to the mode. Dec 8, 2019 at 12:24
  • @ArashEsbati thank you. C-c o and C-c O are already defined by me (and even more important) well trained to me. I understand your hint, that my personal keybinding could rise a conflict, if the bibtex-mode-maintainer decide, to add exact this keybinding to their package?
    – Jan
    Dec 8, 2019 at 12:30
  • I was more thinking about C-c C-e C-o and not C-c [oO] :-) Dec 8, 2019 at 12:32

1 Answer 1


Hurray. I found my mistake.

Instead of

(define-key reftex-mode-map (kbd "C-c C-e C-O") 'bibtex-Online)

one has to write

(define-key bibtex-mode-map (kbd "C-c C-e C-O") 'bibtex-Online)

You have to use bibtex-mode-map, not its brother reftex-mode-map.

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