Google earth api: how to execute handler when info window is opened - google-earth

Question

I have a Google earth plugin istance with data loaded from a kml file.
The kml contains polygons, when clicking on the polygon the baloon with the contenent of the tag is opened.
How can I attach an handler to the opening of the baloon, this handler will then create a custom baloon and stop the default event.
I think it should be something like this, I just don't know what event to listen for!
google.earth.addEventListener("SOMETHING", 'click', function(event) {
//Code to create custom baloon
});

Answer 1

You are listening for 'click', what you need to know is what to listen for click from.
In this case I guess you want to listen for clicks on any polygons.
To do this set up a generic listener for all clicks, then test if the click is on a polygon, if so then cancel the default behaviour and display a custom balloon.
e.g.
google.earth.addEventListener(ge.getWindow(), 'click', function(e) {
if (e.getTarget().getType() == 'KmlPlacemark' &&
e.getTarget().getGeometry().getType() == 'KmlPolygon') {
// Prevent the default balloon from appearing.
e.preventDefault();
// create a custom balloon attached to the target
var balloon = ge.createHtmlStringBalloon('');
balloon.setFeature(e.getTarget());
balloon.setContentString("custom baloon!");
ge.setBalloon(balloon);
}
});