Getting Properties With Event Handlers

This example listens for the zoom_changed event and updates an info window when the zoom level changes.

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());
  });
}index.ts

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());
  });
}
index.js

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.css

HTML

<!DOCTYPE html>
<html>
  <head>
    <title>Getting Properties With Event Handlers</title>
    <script src="https://polyfill.io/v3/polyfill.min.js?features=default"></script>
    <script
      src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&callback=initMap&libraries=&v=weekly"
      defer
    ></script>
    <link rel="stylesheet" type="text/css" href="./style.css" />
    <script src="./app.js"></script>
  </head>
  <body>
    <div id="map"></div>
  </body>
</html>sample.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>
    <script
      src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&callback=initMap&libraries=&v=weekly"
      defer
    ></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>
      "use strict";

      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>
  </body>
</html>
inline.html

"use strict"; 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()); }); }

/* 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; }

<!DOCTYPE html> <html> <head> <title>Getting Properties With Event Handlers</title> <script src="https://polyfill.io/v3/polyfill.min.js?features=default"></script> <script src="https://maps.googleapis.com/maps/api/js?key=AIzaSyBIwzALxUPNbatRBj3Xi1Uhp0fFzwWNBkE&callback=initMap&libraries=&v=weekly" defer ></script>  </head> <body> <div id="map"></div> </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.

npm i -g '@googlemaps/js-samples'
googlemaps-js-samples init event-properties DESTINATION_FOLDER

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Run in Cloud Shell