How can I make it load on button clicks and other events?

I really like the idea of this plugin (also came by an interesting project called phery.js, you might like it).

I want to use it as a means to reduce my site load, but I’m missing two things:
– Per widget loading (instead of whole sidebars).
– Load on click instead of auto load.

With that, I’d be able to offer users a whole range of useful widgets without bogging down my site, since the widgets would only be loaded when actually (clicked to be-) used.

Could you by any chance give me some pointers as to how I might achieve something like this?

https://www.ads-software.com/extend/plugins/ajax-widget-area/