How to clear the collection of custom buttons?

Question

JavaScript

The map has a sight - a circle of a certain radius, always located in the center of the screen. For each marker that hits this scope, a button is added to the screen.
Here JSFIDDLE
The problem is that when the marker goes out of sight, the buttons are not removed from the screen. And I would like to be removed. Please help me fix the code.
The important point is that several markers can hit the scope at the same time.

Answer 1

Remember all the added elements in the array, when you add them again, you perform map.controls.remove for each, something like this .