title: Adding an event listener to the markers using gmaps4rails
body: <p>I am developing an application that uses gmaps4rails (https://github.com/apneadiving/Google-Maps-for-Rails). I want to add an event listener to the marker so that it creates a visualization <strong>next to the map</strong> (as well as displaying an info window on the map). Is it possible to add an event listener for each marker using gmaps4rails?</p>