@Eyal Michael Cohen could you format your code with the code formatter? It will be much more easy to read.
I worked myself on a small prototype for a dynamic map with multi-location :
https://quentin4686.wixsite.com/leg-me-up/listing-on-map
I’m using the new address element combine with a map embedded in an iframe
Regarding the function getDistanceFromLatLonInKm . Would it not be easier/clean to use some npm package surch as https://github.com/Turfjs/turf-distance and https://www.npmjs.com/package/geolib ?
if so, do you think you can get http://turfjs.org/ added to the npm package?