listviewProxy.js

params.mapview.locations = new Proxy(params.mapview.locations, {
  
  set: function(target, key, location){

    Reflect.set(...arguments)
    
    // code to add a location view element to the listview element in the DOM.

    return true
  },
  
  deleteProperty: function (target, hook) {
    
    Reflect.deleteProperty(...arguments)
    
    // code to remove a location view element from the listview element in the DOM.

    return true
    },
  })
}