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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.
// 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.letrectangle:google.maps.Rectangle;letmap:google.maps.Map;letinfoWindow:google.maps.InfoWindow;functioninitMap():void{map=newgoogle.maps.Map(document.getElementById("map")asHTMLElement,{center:{lat:44.5452,lng:-78.5389},zoom:9,});constbounds={north:44.599,south:44.49,east:-78.443,west:-78.649,};// Define the rectangle and set its editable property to true.rectangle=newgoogle.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=newgoogle.maps.InfoWindow();}/** Show the new coordinates for the rectangle in an info window. */functionshowNewRect(){constne=rectangle.getBounds()!.getNorthEast();constsw=rectangle.getBounds()!.getSouthWest();constcontentString="<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);}declareglobal{interfaceWindow{initMap:()=>void;}}window.initMap=initMap;
// 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.letrectangle;letmap;letinfoWindow;functioninitMap(){map=newgoogle.maps.Map(document.getElementById("map"),{center:{lat:44.5452,lng:-78.5389},zoom:9,});constbounds={north:44.599,south:44.49,east:-78.443,west:-78.649,};// Define the rectangle and set its editable property to true.rectangle=newgoogle.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=newgoogle.maps.InfoWindow();}/** Show the new coordinates for the rectangle in an info window. */functionshowNewRect(){constne=rectangle.getBounds().getNorthEast();constsw=rectangle.getBounds().getSouthWest();constcontentString="<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);}window.initMap=initMap;
/** 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>
<head>
<title>Listening to Events</title>
<link rel="stylesheet" type="text/css" href="./style.css" />
<script type="module" src="./index.js"></script>
</head>
<body>
<div id="map"></div>
<!--
The `defer` attribute causes the script to execute after the full HTML
document has been parsed. For non-blocking uses, avoiding race conditions,
and consistent behavior across browsers, consider loading using Promises. See
https://developers.google.com/maps/documentation/javascript/load-maps-js-api
for more information.
-->
<script
src="https://maps.googleapis.com/maps/api/js?key=AIzaSyB41DRUbKWJHPxaFjMAwdrzWzbVKartNGg&callback=initMap&v=weekly"
defer
></script>
</body>
</html>
Git and Node.js are required to run this sample locally. Follow theseinstructionsto install Node.js and NPM. The following commands clone, install dependencies and start the sample application.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-09-04 UTC."],[[["\u003cp\u003eThis example demonstrates creating a user-editable, draggable rectangle on a Google Map.\u003c/p\u003e\n"],["\u003cp\u003eAn info window dynamically displays the updated coordinates of the rectangle's northeast and southwest corners as the user adjusts it.\u003c/p\u003e\n"],["\u003cp\u003eThe sample code utilizes the Google Maps JavaScript API with event listeners and the \u003ccode\u003eRectangle\u003c/code\u003e class to achieve this functionality.\u003c/p\u003e\n"],["\u003cp\u003eYou can interact with a live version of this example via JSFiddle or Google Cloud Shell, or clone and run the sample locally using Git and Node.js.\u003c/p\u003e\n"]]],[],null,["# Listening to Events\n\nThis example adds a user-editable rectangle to the map. When the user changes\nthe bounds of the rectangle, an info window pops up displaying the new bounds.\n\nRead the [documentation](/maps/documentation/javascript/shapes#editable_events). \n\n### TypeScript\n\n```typescript\n// This example adds a user-editable rectangle to the map.\n// When the user changes the bounds of the rectangle,\n// an info window pops up displaying the new bounds.\n\nlet rectangle: google.maps.Rectangle;\nlet map: google.maps.Map;\n\nlet infoWindow: google.maps.InfoWindow;\n\nfunction initMap(): void {\n map = new google.maps.Map(document.getElementById(\"map\") as HTMLElement, {\n center: { lat: 44.5452, lng: -78.5389 },\n zoom: 9,\n });\n\n const bounds = {\n north: 44.599,\n south: 44.49,\n east: -78.443,\n west: -78.649,\n };\n\n // Define the rectangle and set its editable property to true.\n rectangle = new google.maps.Rectangle({\n bounds: bounds,\n editable: true,\n draggable: true,\n });\n\n rectangle.setMap(map);\n\n // Add an event listener on the rectangle.\n rectangle.addListener(\"bounds_changed\", showNewRect);\n\n // Define an info window on the map.\n infoWindow = new google.maps.InfoWindow();\n}\n\n/** Show the new coordinates for the rectangle in an info window. */\nfunction showNewRect() {\n const ne = rectangle.getBounds()!.getNorthEast();\n const sw = rectangle.getBounds()!.getSouthWest();\n\n const contentString =\n \"\u003cb\u003eRectangle moved.\u003c/b\u003e\u003cbr\u003e\" +\n \"New north-east corner: \" +\n ne.lat() +\n \", \" +\n ne.lng() +\n \"\u003cbr\u003e\" +\n \"New south-west corner: \" +\n sw.lat() +\n \", \" +\n sw.lng();\n\n // Set the info window's content and position.\n infoWindow.setContent(contentString);\n infoWindow.setPosition(ne);\n\n infoWindow.open(map);\n}\n\ndeclare global {\n interface Window {\n initMap: () =\u003e void;\n }\n}\nwindow.initMap = initMap;https://github.com/googlemaps/js-samples/blob/2683f7366fb27829401945d2a7e27d77ed2df8e5/samples/rectangle-event/index.ts#L8-L75\n```\n| **Note:** Read the [guide](/maps/documentation/javascript/using-typescript) on using TypeScript and Google Maps.\n\n### JavaScript\n\n```javascript\n// This example adds a user-editable rectangle to the map.\n// When the user changes the bounds of the rectangle,\n// an info window pops up displaying the new bounds.\nlet rectangle;\nlet map;\nlet infoWindow;\n\nfunction initMap() {\n map = new google.maps.Map(document.getElementById(\"map\"), {\n center: { lat: 44.5452, lng: -78.5389 },\n zoom: 9,\n });\n\n const bounds = {\n north: 44.599,\n south: 44.49,\n east: -78.443,\n west: -78.649,\n };\n\n // Define the rectangle and set its editable property to true.\n rectangle = new google.maps.Rectangle({\n bounds: bounds,\n editable: true,\n draggable: true,\n });\n rectangle.setMap(map);\n // Add an event listener on the rectangle.\n rectangle.addListener(\"bounds_changed\", showNewRect);\n // Define an info window on the map.\n infoWindow = new google.maps.InfoWindow();\n}\n\n/** Show the new coordinates for the rectangle in an info window. */\nfunction showNewRect() {\n const ne = rectangle.getBounds().getNorthEast();\n const sw = rectangle.getBounds().getSouthWest();\n const contentString =\n \"\u003cb\u003eRectangle moved.\u003c/b\u003e\u003cbr\u003e\" +\n \"New north-east corner: \" +\n ne.lat() +\n \", \" +\n ne.lng() +\n \"\u003cbr\u003e\" +\n \"New south-west corner: \" +\n sw.lat() +\n \", \" +\n sw.lng();\n\n // Set the info window's content and position.\n infoWindow.setContent(contentString);\n infoWindow.setPosition(ne);\n infoWindow.open(map);\n}\n\nwindow.initMap = initMap;https://github.com/googlemaps/js-samples/blob/2683f7366fb27829401945d2a7e27d77ed2df8e5/dist/samples/rectangle-event/docs/index.js#L7-L62\n```\n| **Note:** The JavaScript is compiled from the TypeScript snippet.\n\n### CSS\n\n```css\n/* \n * Always set the map height explicitly to define the size of the div element\n * that contains the map. \n */\n#map {\n height: 100%;\n}\n\n/* \n * Optional: Makes the sample page fill the window. \n */\nhtml,\nbody {\n height: 100%;\n margin: 0;\n padding: 0;\n}\nhttps://github.com/googlemaps/js-samples/blob/2683f7366fb27829401945d2a7e27d77ed2df8e5/dist/samples/rectangle-event/docs/style.css#L7-L24\n```\n\n### HTML\n\n```html\n\u003chtml\u003e\n \u003chead\u003e\n \u003ctitle\u003eListening to Events\u003c/title\u003e\n\n \u003clink rel=\"stylesheet\" type=\"text/css\" href=\"./style.css\" /\u003e\n \u003cscript type=\"module\" src=\"./index.js\"\u003e\u003c/script\u003e\n \u003c/head\u003e\n \u003cbody\u003e\n \u003cdiv id=\"map\"\u003e\u003c/div\u003e\n\n \u003c!-- \n The `defer` attribute causes the script to execute after the full HTML\n document has been parsed. For non-blocking uses, avoiding race conditions,\n and consistent behavior across browsers, consider loading using Promises. See\n https://developers.google.com/maps/documentation/javascript/load-maps-js-api\n for more information.\n --\u003e\n \u003cscript\n src=\"https://maps.googleapis.com/maps/api/js?key=AIzaSyB41DRUbKWJHPxaFjMAwdrzWzbVKartNGg&callback=initMap&v=weekly\"\n defer\n \u003e\u003c/script\u003e\n \u003c/body\u003e\n\u003c/html\u003ehttps://github.com/googlemaps/js-samples/blob/2683f7366fb27829401945d2a7e27d77ed2df8e5/dist/samples/rectangle-event/docs/index.html#L8-L30\n```\n\n### Try Sample\n\n[JSFiddle.net](https://jsfiddle.net/gh/get/library/pure/googlemaps/js-samples/tree/master/dist/samples/rectangle-event/jsfiddle) [Google Cloud Shell](https://ssh.cloud.google.com/cloudshell/editor?cloudshell_git_repo=https%3A%2F%2Fgithub.com%2Fgooglemaps%2Fjs-samples&cloudshell_git_branch=sample-rectangle-event&cloudshell_tutorial=cloud_shell_instructions.md&cloudshell_workspace=.)\n\n### Clone Sample\n\n\nGit and Node.js are required to run this sample locally. Follow these [instructions](https://docs.npmjs.com/downloading-and-installing-node-js-and-npm) to install Node.js and NPM. The following commands clone, install dependencies and start the sample application. \n\n git clone -b sample-rectangle-event https://github.com/googlemaps/js-samples.git\n cd js-samples\n npm i\n npm start\n\n\nOther samples can be tried by switching to any branch beginning with `sample-`\u003cvar translate=\"no\"\u003eSAMPLE_NAME\u003c/var\u003e. \n\n git checkout sample-\u003cvar translate=\"no\"\u003e\u003cspan class=\"devsite-syntax-nx\"\u003eSAMPLE_NAME\u003c/span\u003e\u003c/var\u003e\n npm i\n npm start"]]
