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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.

JavaScript

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());
  });
}

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>
    <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>
      (function(exports) {
        "use strict";

        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());
          });
        }

        exports.initMap = initMap;
      })((this.window = this.window || {}));
    </script>
  </head>
  <body>
    <div id="map"></div>
  </body>
</html>
(function(exports) { "use strict"; 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()); }); } exports.initMap = initMap; })((this.window = this.window || {}));
/* 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=&callback=initMap&libraries=&v=weekly" defer ></script> <!-- jsFiddle will insert css and js --> </head> <body> <div id="map"></div> </body> </html>