Question

Given a google maps marker how can I change the title ?

var _marker = new google.maps.Marker({
  position: aPoint,
  map: mmap,
  title:"old title"
});

I have tried

_marker.setTitle("new title");  

and

_marker.title = "new title";

but the title is still “old title”

Answer 1

Googling your question suggests this:

The information is not held in the marker.title property. Where it is
held varies from release to release. In v2.129e it’s held in
marker.$.title.
Also, the information is only processed when you addOverlay the marker.
So in v2,129e you can write:
marker.$.title = “updated title”;
map.removeOverlay(marker);
map.addOverlay(marker);

(original answer by Mike Williams of Blackpool, UK)