title: Is it possible to retrieve a Javascript variable from a script to use it in R
body: <p>my question is in the title, I'm currently developing a shiny App, and as I'm trying to use a leaflet plugin that hasn't been translated in a R package at the moment, I'm using a var map in a js script (I use this script in my UI.R), the fact is that I would like in the server part to be able to communicate with this map, with for exemple a leaflet proxy to add tiles on it, but I didn't manage to make the server part communicate with that Js var...</p>
  
  <p>Maybe if a have a clew of what's the problem you could help me a lot.!</p>
  
  <p>Thanks.</p>