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feat: Migrates the rectangle-event sample to js-api-samples. (#1317)
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‎samples/rectangle-event/README.md‎

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# Google Maps JavaScript Sample
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## rectangle-event
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This sample demonstrates how to listen to events on a rectangle in the Maps JavaScript API.
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## Setup
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### Before starting run:
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`npm i`
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### Run an example on a local web server
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`cd samples/rectangle-event`
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`npm start`
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### Build an individual example
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`cd samples/rectangle-event`
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`npm run build`
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From 'samples':
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`npm run build --workspace=rectangle-event/`
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### Build all of the examples.
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From 'samples':
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`npm run build-all`
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### Run lint to check for problems
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`cd samples/rectangle-event`
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`npx eslint index.ts`
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## Feedback
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For feedback related to this sample, please open a new issue on
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[GitHub](https://github.com/googlemaps-samples/js-api-samples/issues).

‎samples/rectangle-event/index.html‎

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<!doctype html>
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<!--
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@license
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Copyright 2026 Google LLC. All Rights Reserved.
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SPDX-License-Identifier: Apache-2.0
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-->
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<!-- [START maps_rectangle_event] -->
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<html>
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<head>
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<title>Listening to Events</title>
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<link rel="stylesheet" type="text/css" href="./style.css" />
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<script type="module" src="./index.js"></script>
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<!-- prettier-ignore -->
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<script>(g=>{var h,a,k,p="The Google Maps JavaScript API",c="google",l="importLibrary",q="__ib__",m=document,b=window;b=b[c]||(b[c]={});var d=b.maps||(b.maps={}),r=new Set,e=new URLSearchParams,u=()=>h||(h=new Promise(async(f,n)=>{await (a=m.createElement("script"));e.set("libraries",[...r]+"");for(k in g)e.set(k.replace(/[A-Z]/g,t=>"_"+t[0].toLowerCase()),g[k]);e.set("callback",c+".maps."+q);a.src=`https://maps.${c}apis.com/maps/api/js?`+e;d[q]=f;a.onerror=()=>h=n(Error(p+" could not load."));a.nonce=m.querySelector("script[nonce]")?.nonce||"";m.head.append(a)}));d[l]?console.warn(p+" only loads once. Ignoring:",g):d[l]=(f,...n)=>r.add(f)&&u().then(()=>d[l](f,...n))})
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({key: "AIzaSyA6myHzS10YXdcazAFalmXvDkrYCp5cLc8", v: "weekly" });</script>
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</head>
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<body>
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<gmp-map center="44.5452,-78.5389" zoom="9" map-id="DEMO_MAP_ID"></gmp-map>
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</body>
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</html>
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<!-- [END maps_rectangle_event] -->

‎samples/rectangle-event/index.ts‎

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/**
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* @license
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* Copyright 2026 Google LLC. All Rights Reserved.
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* SPDX-License-Identifier: Apache-2.0
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*/
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// [START maps_rectangle_event]
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// This example adds a user-editable rectangle to the map.
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// When the user changes the bounds of the rectangle,
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// an info window pops up displaying the new bounds.
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let rectangle: google.maps.Rectangle;
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let innerMap: google.maps.Map;
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let infoWindow: google.maps.InfoWindow;
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async function initMap(): Promise<void> {
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await google.maps.importLibrary("maps");
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const mapElement = document.querySelector('gmp-map') as google.maps.MapElement;
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innerMap = mapElement.innerMap;
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const bounds = {
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north: 44.599,
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south: 44.49,
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east: -78.443,
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west: -78.649,
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};
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// Define the rectangle and set its editable property to true.
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rectangle = new google.maps.Rectangle({
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bounds: bounds,
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editable: true,
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draggable: true,
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});
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rectangle.setMap(innerMap);
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// Add an event listener on the rectangle.
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rectangle.addListener("bounds_changed", showNewRect);
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// Define an info window on the map.
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infoWindow = new google.maps.InfoWindow();
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}
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/** Show the new coordinates for the rectangle in an info window. */
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function showNewRect() {
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const ne = rectangle.getBounds()!.getNorthEast();
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const sw = rectangle.getBounds()!.getSouthWest();
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const contentString =
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"<b>Rectangle moved.</b><br>" +
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"New north-east corner: " +
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ne.lat() +
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", " +
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ne.lng() +
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"<br>" +
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"New south-west corner: " +
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sw.lat() +
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", " +
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sw.lng();
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// Set the info window's content and position.
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infoWindow.setContent(contentString);
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infoWindow.setPosition(ne);
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infoWindow.open(innerMap);
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}
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initMap();
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// [END maps_rectangle_event]

‎samples/rectangle-event/package.json‎

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{
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"name": "@js-api-samples/rectangle-event",
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"version": "1.0.0",
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"scripts": {
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"build": "tsc && bash ../jsfiddle.sh rectangle-event && bash ../app.sh rectangle-event && bash ../docs.sh rectangle-event && npm run build:vite --workspace=. && bash ../dist.sh rectangle-event",
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"test": "tsc && npm run build:vite --workspace=.",
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"start": "tsc && vite build --base './' && vite",
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"build:vite": "vite build --base './'",
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"preview": "vite preview"
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},
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"dependencies": {
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}
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}

‎samples/rectangle-event/style.css‎

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/**
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* @license
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* Copyright 2026 Google LLC. All Rights Reserved.
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* SPDX-License-Identifier: Apache-2.0
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*/
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/* [START maps_rectangle_event] */
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/*
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* Optional: Makes the sample page fill the window.
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*/
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html,
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body {
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height: 100%;
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margin: 0;
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padding: 0;
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}
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/* [END maps_rectangle_event] */

‎samples/rectangle-event/tsconfig.json‎

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{
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"extends": "../../tsconfig.base.json",
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"compilerOptions": {
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"rootDir": "."
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},
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"include": [
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"./*.ts",
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]
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}

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