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Getting Properties With Event Handlers

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


      

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>

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>
"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=AIzaSyCb1xprYSpXd0q_yDsJ1W2UGhfl9_YGKU0&callback=initMap&libraries=&v=weekly" defer ></script> <!-- jsFiddle will insert css and js --> </head> <body> <div id="map"></div> </body> </html>