This example listens for the zoom_changed event and updates
an info window when the zoom level changes.
Read the documentation.
function initMap() {
var originalMapCenter = new google.maps.LatLng(-25.363882, 131.044922);
var map = new google.maps.Map(document.getElementById('map'), {
zoom: 4,
center: originalMapCenter
});
var infowindow = new google.maps.InfoWindow({
content: 'Change the zoom level',
position: originalMapCenter
});
infowindow.open(map);
map.addListener('zoom_changed', function() {
infowindow.setContent('Zoom: ' + map.getZoom());
});
}
<div id="map"></div>
/* Always set the map height explicitly to define the size of the div
* element that contains the map. */
#map {
height: 100%;
}
/* Optional: Makes the sample page fill the window. */
html, body {
height: 100%;
margin: 0;
padding: 0;
}
<!-- Replace the value of the key parameter with your own API key. --> <script async defer src="https://maps.googleapis.com/maps/api/js?key=AIzaSyCkUOdZ5y7hMm0yrcCQoCvLwzdM6M8s5qk&callback=initMap"> </script>
Try it yourself
You can experiment with this code in JSFiddle by clicking the <> icon in the
top-right corner of the code window.
<!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">
<style>
/* Always set the map height explicitly to define the size of the div
* element that contains the map. */
#map {
height: 100%;
}
/* Optional: Makes the sample page fill the window. */
html, body {
height: 100%;
margin: 0;
padding: 0;
}
</style>
</head>
<body>
<div id="map"></div>
<script>
function initMap() {
var originalMapCenter = new google.maps.LatLng(-25.363882, 131.044922);
var map = new google.maps.Map(document.getElementById('map'), {
zoom: 4,
center: originalMapCenter
});
var infowindow = new google.maps.InfoWindow({
content: 'Change the zoom level',
position: originalMapCenter
});
infowindow.open(map);
map.addListener('zoom_changed', function() {
infowindow.setContent('Zoom: ' + map.getZoom());
});
}
</script>
<script async defer
src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&callback=initMap">
</script>
</body>
</html>
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