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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.

TypeScript

// 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.

let rectangle: google.maps.Rectangle;
let map: google.maps.Map;

let infoWindow: google.maps.InfoWindow;

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

  const 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. */
function showNewRect() {
  const ne = rectangle.getBounds().getNorthEast();
  const sw = rectangle.getBounds().getSouthWest();

  const 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);
}

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.
let rectangle;
let map;
let infoWindow;

function initMap() {
  map = new google.maps.Map(document.getElementById("map"), {
    center: { lat: 44.5452, lng: -78.5389 },
    zoom: 9
  });
  const 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. */
function showNewRect() {
  const ne = rectangle.getBounds().getNorthEast();
  const sw = rectangle.getBounds().getSouthWest();
  const 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>
      "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.
      let rectangle;
      let map;
      let infoWindow;

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

      function showNewRect() {
        const ne = rectangle.getBounds().getNorthEast();
        const sw = rectangle.getBounds().getSouthWest();
        const 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);
      }
    </script>
  </head>
  <body>
    <div id="map"></div>
  </body>
</html>
"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. let rectangle; let map; let infoWindow; function initMap() { map = new google.maps.Map(document.getElementById("map"), { center: { lat: 44.5452, lng: -78.5389 }, zoom: 9 }); const 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. */ function showNewRect() { const ne = rectangle.getBounds().getNorthEast(); const sw = rectangle.getBounds().getSouthWest(); const 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); }
/* 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=AIzaSyCb1xprYSpXd0q_yDsJ1W2UGhfl9_YGKU0&callback=initMap&libraries=&v=weekly" defer ></script> <!-- jsFiddle will insert css and js --> </head> <body> <div id="map"></div> </body> </html>