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Listening to Events

This example adds a user-editable rectangle to the map. When the user changes the bounds of the rectangle, an info window pops up displaying the new bounds.

Read the documentation.

JavaScript

// This example adds a user-editable rectangle to the map.
// When the user changes the bounds of the rectangle,
// an info window pops up displaying the new bounds.

var rectangle;
var map;
var infoWindow;

function initMap() {
  map = new google.maps.Map(document.getElementById("map"), {
    center: { lat: 44.5452, lng: -78.5389 },
    zoom: 9
  });

  var bounds = {
    north: 44.599,
    south: 44.49,
    east: -78.443,
    west: -78.649
  };

  // Define the rectangle and set its editable property to true.
  rectangle = new google.maps.Rectangle({
    bounds: bounds,
    editable: true,
    draggable: true
  });

  rectangle.setMap(map);

  // Add an event listener on the rectangle.
  rectangle.addListener("bounds_changed", showNewRect);

  // Define an info window on the map.
  infoWindow = new google.maps.InfoWindow();
}
// Show the new coordinates for the rectangle in an info window.

/** @this {google.maps.Rectangle} */
function showNewRect(event) {
  var ne = rectangle.getBounds().getNorthEast();
  var sw = rectangle.getBounds().getSouthWest();

  var contentString =
    "<b>Rectangle moved.</b><br>" +
    "New north-east corner: " +
    ne.lat() +
    ", " +
    ne.lng() +
    "<br>" +
    "New south-west corner: " +
    sw.lat() +
    ", " +
    sw.lng();

  // Set the info window's content and position.
  infoWindow.setContent(contentString);
  infoWindow.setPosition(ne);

  infoWindow.open(map);
}

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>Listening to Events</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>Listening to Events</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";

        // This example adds a user-editable rectangle to the map.
        // When the user changes the bounds of the rectangle,
        // an info window pops up displaying the new bounds.

        function initMap() {
          exports.map = new google.maps.Map(document.getElementById("map"), {
            center: {
              lat: 44.5452,
              lng: -78.5389
            },
            zoom: 9
          });
          var bounds = {
            north: 44.599,
            south: 44.49,
            east: -78.443,
            west: -78.649
          }; // Define the rectangle and set its editable property to true.

          exports.rectangle = new google.maps.Rectangle({
            bounds: bounds,
            editable: true,
            draggable: true
          });
          exports.rectangle.setMap(exports.map); // Add an event listener on the rectangle.

          exports.rectangle.addListener("bounds_changed", showNewRect); // Define an info window on the map.

          exports.infoWindow = new google.maps.InfoWindow();
        } // Show the new coordinates for the rectangle in an info window.

        /** @this {google.maps.Rectangle} */

        function showNewRect(event) {
          var ne = exports.rectangle.getBounds().getNorthEast();
          var sw = exports.rectangle.getBounds().getSouthWest();
          var contentString =
            "<b>Rectangle moved.</b><br>" +
            "New north-east corner: " +
            ne.lat() +
            ", " +
            ne.lng() +
            "<br>" +
            "New south-west corner: " +
            sw.lat() +
            ", " +
            sw.lng(); // Set the info window's content and position.

          exports.infoWindow.setContent(contentString);
          exports.infoWindow.setPosition(ne);
          exports.infoWindow.open(exports.map);
        }

        exports.initMap = initMap;
        exports.showNewRect = showNewRect;
      })((this.window = this.window || {}));
    </script>
  </head>
  <body>
    <div id="map"></div>
  </body>
</html>
(function(exports) { "use strict"; // This example adds a user-editable rectangle to the map. // When the user changes the bounds of the rectangle, // an info window pops up displaying the new bounds. function initMap() { exports.map = new google.maps.Map(document.getElementById("map"), { center: { lat: 44.5452, lng: -78.5389 }, zoom: 9 }); var bounds = { north: 44.599, south: 44.49, east: -78.443, west: -78.649 }; // Define the rectangle and set its editable property to true. exports.rectangle = new google.maps.Rectangle({ bounds: bounds, editable: true, draggable: true }); exports.rectangle.setMap(exports.map); // Add an event listener on the rectangle. exports.rectangle.addListener("bounds_changed", showNewRect); // Define an info window on the map. exports.infoWindow = new google.maps.InfoWindow(); } // Show the new coordinates for the rectangle in an info window. /** @this {google.maps.Rectangle} */ function showNewRect(event) { var ne = exports.rectangle.getBounds().getNorthEast(); var sw = exports.rectangle.getBounds().getSouthWest(); var contentString = "<b>Rectangle moved.</b><br>" + "New north-east corner: " + ne.lat() + ", " + ne.lng() + "<br>" + "New south-west corner: " + sw.lat() + ", " + sw.lng(); // Set the info window's content and position. exports.infoWindow.setContent(contentString); exports.infoWindow.setPosition(ne); exports.infoWindow.open(exports.map); } exports.initMap = initMap; exports.showNewRect = showNewRect; })((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>Listening to Events</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>