Adding an event listener to the markers using gmaps4rails

Question

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 next to the map (as well as displaying an info window on the map). Is it possible to add an event listener for each marker using gmaps4rails?

Answer 1

Of course it's possible.

You should write your code in the gmaps4rails_callback javascript function to be sure it's executed when everything is setup.

And then loop the markers js variable: Gmaps4Rails.markers

The attributes of each marker in this array are:

• longitude

• latitude

• google_object containing the google marker

That said you can do whatever you want.

As a side note, the map is also available doing Gmaps4Rails.map.

In general, read the gmaps4rails.js file, it's well documented (I hope!).

EDIT:

The problem you explain in the comments is weird, it works perfectly for me when I use:

google.maps.event.addListener(Gmaps4Rails.markers[0].google_object, 'click', function(object){ alert("hello"); });

I guess you should try to use a more traditional for loop like:

<script type="text/javascript"> 
function gmaps4rails_callback() { 
  function say_yo(arg) { return function(){alert('yo '+ arg + '!' );};};
    for (var i = 0; i <  Gmaps4Rails.markers.length; ++i) {
      google.maps.event.addListener(Gmaps4Rails.markers[i].google_object, 'click', say_yo(i));
    }
}
</script>