Question

I always make typos when typing the long function names like ctx.createRadialGradient. It will be great if I can autocomplete them.

1. Is there any plugin I can use out of the box?
2. If not, how to add new custom keywords for vim’s autocompletion?

Answer 1

In insert mode exists command Ctrl-XCtrl-P to complete with previous matches. So if you have:

ctx.createRadialGradient
ctx.createGradient
ctx.create

and begin to write ctx.cr, press Ctrl-XCtrl-P and those strings will appear in a context window, you can navigate throught them with arrow keys or with Ctrl-N for Next or Ctrl-P for Previous.