JavaScript page loader - SEO impact

[Lvet]

Hello all,
I am working on a site that has a bizarre page load system. All pages get loaded trough the same Javascript snippet, for example:

Changing the values in the form changes the page that is loaded.

The most incredible thing is that, against my expectations, pages do get indexed by Google.
My question is: "Does loading pages dynamically using JavaScript affect the overall SEO performance?"

Why are pages getting indexed?

Thank you for shedding light on this.
Cheers
Luca

[Lvet]

I have done my homework researching.
As a matter of fact since 2010 Google can crawl and execute JavaScript links, therefore the pages will be indexed and ranked exactly as static HTML pages.

It would be nice to have confirmation on this

[MattRoney]

Hi Luca! So sorry for the wait. Yes, Google is able to load, crawl, and index pages written in Javascript. There are mixed reports as to how well, exactly, but your research is correct.