Change keybinding for up/down when in vim popup

Question

I'm using deoplete plugin for auto completion. In Vim, default keybinding for up and down when popup appears is CtrlN / CtrlP. I want to change to CtrlJ / CtrlK for same behavior with CtrlP plugin.

How can I change this. thanks

Answer 1

You can't "directly" map keys in the pop-up menu, you'll have to use expression mappings and the pumvisible() function to check if the popup menu is visible.

inoremap <expr> <C-j> pumvisible() ? "\<C-n>" : "\<C-j>"
inoremap <expr> <C-k> pumvisible() ? "\<C-p>" : "\<C-k>"

If the popup menu is visible <C-j> is mapped to <C-n> to make it go to the next entry. If the menu isn't visible <C-j> is mapped to <C-j>.