Sort products by prices

[texnixe]

Yes, it’s better to work with GET request and check for a sort parameter instead of a POST request. That way your pagination will stay intact. If you use a POST request, it get’s more ccomplicated, because you have to store your value in the session to make it available across different pages.

Bugs with filtering paginated content on a page

The easiest way is to use a GET request instead of a POST by changing the method in your form and removing the check for POST request in your controller. There is absolutely no reason to send a POST request for this filtering stuff. If you want to keep the POST request for some reason, you would have to perpetuate your filter data in a session cookie. This works completely without Ajax or any other JavaScript.