How to change the content of only a certain block?

Question

PHP

Hello, I am studying the MVC pattern and now when I access a certain url, I take the necessary layout file from the view folder to display the content. The site has a side menu where JS logic is executed (For example, opening blocks, highlighting the active menu item, etc.). I would like not to reload the page and change the content in a specific block. I'm thinking of using ajax requests to the server and getting ready-made layout as a result of rendering using JS. Most likely I have already answered my own question, but suddenly I think wrong. Tell.

Answer 1

I'm thinking of using ajax requests to the server and getting ready-made layout as a result of rendering using JS.

Right.
For starters it's ok.
Then you can switch to using a template engine on the client and getting not markup via Ajax, but pure data in json.
The third stage is the transition to using the js framework.