change Dom element based on firebase admin value events

Question

I have a simple HTML page printed out inside a Servlet. Here I have setup firebase admin sdk and have set a value event listener for a path.

When the events fire, I wish

Answer 1

So i managed to solve this using a JSP instead of a Servelet.

In either case, the solution was to tranfer all the logic to a JavaScript function. Then calling the said function on body load.

onload=callthefunction()

The firebase listeners were converted from java to the JavaScript version:

on()
off()

This way there is need to call ajax or anything and the elements that need to be changed can be directly altered from JavaScript