Hello @Wise !

The simplest way is to call the addJs template method in any place before it is necessary.

But if you have in your module own _header.html template file then you may add your files to preloader like:

INSERT INTO `sys_preloader` (`module`, `type`, `content`, `active`) VALUES
('you module name', 'js_system', 'modules/[your name]/[name of your module]/js/|name of your file.js', 1);