Rainer M Krug <Rainer@krugs.de> writes:

> Oleh <ohwoeowho@gmail.com> writes:
>
>>> I know that I could use org-babel-load-file, or outshine.  What are
>>> other possibilities?  What are the caveats (and advantages) of both
>>> (other?) ways?
>>
>> I'm using a one .el file per mode approach, with around 4000 lines
>> split into 40 files.
>>
>> This approach simplifies things a lot: for instance I haven't touched
>> Javascript in ages, but all my customizations for it are sitting in
>> javascript.el without getting in the way of the stuff that I'm using
>> now. They aren't even loaded unless I open a js file.
>
> Interesting - is your configuration online, so that one could take a
> look at it? I did not find them on your github page?
>
> Or how do you do it, that the e.g. javascript.el is only loaded when a
> js file is opened? Because this is exactly what I would like to have.

How about something like this:

(with-eval-after-load 'js-mode (load "javascript.el"))

Use eval-after-load if you are using an older Emacs.  Note I don't
know if there's anything called js-mode. . .