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I want to set a key binding for outline-next-visible-heading but I fail to do so.
I believe using hooks is a solution for this so I added this to my .emacs
(defun outline-mode-test-hook()
(define-key outline-mode-prefix-map "j" 'outline-next-visible-heading))
(add-hook 'outline-mode-hook 'outline-mode-test-hook)
The key binding has no effect.
P.S. Who actually runs outline-mode-hook ? I didn't see any invocation within file outline.el.
Your question doesn't mention it, but your comment hints at the fact that you're using outline-minor-mode rather than outline-mode.
outline-mode-hook is run when you enter the outline-mode major mode. Since you use outline-minor-mode that hook is not run, instead the outline-minor-mode-hook is run, hence you'd need something like:
(add-hook 'outline-minor-mode-hook #'outline-mode-test-hook)
Another option is to use
(with-eval-after-load 'outline
(define-key outline-mode-prefix-map "j" 'outline-next-visible-heading))
outline-mode.(setq outline-minor-mode-prefix "\C-co")set so all of my outline commands are prefixed withCtrl-c oand work fine. When I typeCtrl-c o jnothing happens. If I manually (usingC-x C-e) execute define-key directive custom key binding start to work. But of course I need it to be done automatically on startup.