View this example full screen.
function initialize() {
var myLatLng = new google.maps.LatLng(-25.363882, 131.044922);
var mapOptions = {
zoom: 4,
center: myLatLng,
mapTypeId: google.maps.MapTypeId.ROADMAP
};
var map = new google.maps.Map(document.getElementById('map-canvas'),
mapOptions);
var infowindow = new google.maps.InfoWindow({
content: 'Change the zoom level',
position: myLatLng
});
infowindow.open(map);
google.maps.event.addListener(map, 'zoom_changed', function() {
var zoomLevel = map.getZoom();
map.setCenter(myLatLng);
infowindow.setContent('Zoom: ' + zoomLevel);
});
}
google.maps.event.addDomListener(window, 'load', initialize);
<!DOCTYPE html>
<html>
<head>
<title>Getting properties with event handlers</title>
<meta name="viewport" content="initial-scale=1.0, user-scalable=no">
<meta charset="utf-8">
<link href="/maps/documentation/javascript/examples/default.css" rel="stylesheet">
<script src="https://maps.googleapis.com/maps/api/js?v=3.exp&sensor=false"></script>
<script>
function initialize() {
var myLatLng = new google.maps.LatLng(-25.363882, 131.044922);
var mapOptions = {
zoom: 4,
center: myLatLng,
mapTypeId: google.maps.MapTypeId.ROADMAP
};
var map = new google.maps.Map(document.getElementById('map-canvas'),
mapOptions);
var infowindow = new google.maps.InfoWindow({
content: 'Change the zoom level',
position: myLatLng
});
infowindow.open(map);
google.maps.event.addListener(map, 'zoom_changed', function() {
var zoomLevel = map.getZoom();
map.setCenter(myLatLng);
infowindow.setContent('Zoom: ' + zoomLevel);
});
}
google.maps.event.addDomListener(window, 'load', initialize);
</script>
</head>
<body>
<div id="map-canvas"></div>
</body>
</html>