This example listens for the zoom_changed
event and updates an info
window when the zoom level changes.
Read the documentation.
TypeScript
function initMap(): void { const originalMapCenter = new google.maps.LatLng(-25.363882, 131.044922); const map = new google.maps.Map( document.getElementById("map") as HTMLElement, { zoom: 4, center: originalMapCenter, } ); const infowindow = new google.maps.InfoWindow({ content: "Change the zoom level", position: originalMapCenter, }); infowindow.open(map); map.addListener("zoom_changed", () => { infowindow.setContent("Zoom: " + map.getZoom()!); }); }
JavaScript
function initMap() { const originalMapCenter = new google.maps.LatLng(-25.363882, 131.044922); const map = new google.maps.Map(document.getElementById("map"), { zoom: 4, center: originalMapCenter, }); const infowindow = new google.maps.InfoWindow({ content: "Change the zoom level", position: originalMapCenter, }); infowindow.open(map); map.addListener("zoom_changed", () => { infowindow.setContent("Zoom: " + map.getZoom()); }); }
CSS
/* 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; }
HTML
<!DOCTYPE html> <html> <head> <title>Getting Properties With Event Handlers</title> <script src="https://polyfill.io/v3/polyfill.min.js?features=default"></script> <link rel="stylesheet" type="text/css" href="./style.css" /> <script src="./index.js"></script> </head> <body> <div id="map"></div> <!-- Async script executes immediately and must be after any DOM elements used in callback. --> <script src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&callback=initMap&libraries=&v=weekly" async ></script> </body> </html>
All
<!DOCTYPE html> <html> <head> <title>Getting Properties With Event Handlers</title> <script src="https://polyfill.io/v3/polyfill.min.js?features=default"></script> <style type="text/css"> /* 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> <script> function initMap() { const originalMapCenter = new google.maps.LatLng( -25.363882, 131.044922 ); const map = new google.maps.Map(document.getElementById("map"), { zoom: 4, center: originalMapCenter, }); const infowindow = new google.maps.InfoWindow({ content: "Change the zoom level", position: originalMapCenter, }); infowindow.open(map); map.addListener("zoom_changed", () => { infowindow.setContent("Zoom: " + map.getZoom()); }); } </script> </head> <body> <div id="map"></div> <!-- Async script executes immediately and must be after any DOM elements used in callback. --> <script src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&callback=initMap&libraries=&v=weekly" async ></script> </body> </html>
Create a starter application from sample
A skeleton starter application using TypeScript, Webpack, and Babel can be generated from this sample using one of the methods below.
Run Locally
Node.js is required to run this sample locally. Follow these instructions to install Node.js and NPM.
npx @googlemaps/js-samples init event-properties DESTINATION_FOLDER
Run in Google Cloud Shell
Google Cloud Shell is an interactive shell environment for Google Cloud Platform that makes it easy for you to learn and experiment with GCP and manage your projects and resources from your web browser.
Run in Cloud Shell