Why is self here (what can be replaced)?

Question

JavaScript

instead of writing self.innerHTML = this.value;

this.innerHTML = this.value;
and will not work

20-23 lines
https://jsfiddle.net/s8245hx3/

Answer 1

self is needed in order to get the this of the element above

Answer 2

You have such a tin there ... why even add handlers inside adding handlers inside adding other handlers, and still refer to this ??? Try to declare all handlers in different functions and assign them by reference