How to create an example generator for the school of mental arithmetic?

Question

Laravel

We need to create such a generator. Site on laravel + vue. Interested in synchronization between the left side, where the parameters are selected and the right side, where, as I understand it in the iframe, the pdf viewer is loaded.
As I understand it, it's better to do it all through vue. Please explain how to organize synchronization between the left and right parts and how to draw examples by clicking on "generate"? What libraries need to be installed to solve this problem?
Please do not delete this question! This is not a request to do the task for me, but the question of what dependencies are needed and how to approach the solution of the task in general.

Answer 1

NodeJS
Must accept message
Process
Generate response
Send response
And then everything depends on your client and server.
For example ExpressJS for NodeJS

getOne: function(req, res) {
    var message= req.params.message;
        res.status(200);
        res.json(message);
      }
    })
    
  },