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>