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feat: Migrates the boundaries-click sample. (#879)
* feat: Migrates the boundaries-click sample. * Update Google Maps API key in index.html
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‎samples/boundaries-click/README.md‎

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# Google Maps JavaScript Sample
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This sample is generated from @googlemaps/js-samples located at
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https://github.com/googlemaps-samples/js-api-samples.
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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/boundaries-click`
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`npm start`
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### Build an individual example
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`cd samples/boundaries-click`
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`npm run build`
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From 'samples':
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`npm run build --workspace=boundaries-click/`
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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/boundaries-click`
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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/boundaries-click/index.html‎

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<!doctype html>
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<!--
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@license
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Copyright 2025 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_boundaries_click_event] -->
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<html>
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<head>
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<title>Handle Region Boundary Click Event</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="39.23,-105.73" zoom="8" map-id="8b37d7206ccf0121a2634fd5">
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</body>
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</html>
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<!-- [END maps_boundaries_click_event] -->

‎samples/boundaries-click/index.ts‎

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/**
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* @license
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* Copyright 2025 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_boundaries_click_event]
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let innerMap;
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let featureLayer;
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let infoWindow;
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let lastInteractedFeatureIds = [];
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let lastClickedFeatureIds = [];
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// [START maps_boundaries_click_event_handler]
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function handleClick(/* MouseEvent */ e) {
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lastClickedFeatureIds = e.features.map((f) => f.placeId);
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lastInteractedFeatureIds = [];
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featureLayer.style = applyStyle;
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createInfoWindow(e);
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}
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function handleMouseMove(/* MouseEvent */ e) {
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lastInteractedFeatureIds = e.features.map((f) => f.placeId);
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featureLayer.style = applyStyle;
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}
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// [END maps_boundaries_click_event_handler]
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async function initMap() {
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// Request needed libraries.
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const { Map, InfoWindow } = (await google.maps.importLibrary(
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'maps'
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)) as google.maps.MapsLibrary;
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// Get the gmp-map element.
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const mapElement = document.querySelector(
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'gmp-map'
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) as google.maps.MapElement;
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// Get the inner map.
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innerMap = mapElement.innerMap;
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// Set map options.
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innerMap.setOptions({
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mapTypeControl: false,
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});
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//[START maps_boundaries_click_event_add_layer]
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// Add the feature layer.
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featureLayer = innerMap.getFeatureLayer(
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google.maps.FeatureType.ADMINISTRATIVE_AREA_LEVEL_2
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);
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// Add the event listeners for the feature layer.
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featureLayer.addListener('click', handleClick);
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featureLayer.addListener('mousemove', handleMouseMove);
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// Map event listener.
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innerMap.addListener('mousemove', () => {
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// If the map gets a mousemove, that means there are no feature layers
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// with listeners registered under the mouse, so we clear the last
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// interacted feature ids.
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if (lastInteractedFeatureIds?.length) {
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lastInteractedFeatureIds = [];
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featureLayer.style = applyStyle;
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}
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});
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//[END maps_boundaries_click_event_add_layer]
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// Create the infowindow.
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infoWindow = new InfoWindow({});
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// Apply style on load, to enable clicking.
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featureLayer.style = applyStyle;
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}
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// Helper function for the infowindow.
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async function createInfoWindow(event) {
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let feature = event.features[0];
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if (!feature.placeId) return;
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// Update the info window.
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// Get the place instance from the selected feature.
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const place = await feature.fetchPlace();
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// Create a new div to hold the text content.
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let content = document.createElement('div');
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// Get the text values.
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let nameText = document.createElement('span');
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nameText.textContent = `Display name: ${place.displayName}`;
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let placeIdText = document.createElement('span');
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placeIdText.textContent = `Place ID: ${feature.placeId}`;
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let featureTypeText = document.createElement('span');
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featureTypeText.textContent = `Feature type: ${feature.featureType}`;
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// Append the text to the div.
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content.appendChild(nameText);
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content.appendChild(document.createElement('br'));
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content.appendChild(placeIdText);
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content.appendChild(document.createElement('br'));
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content.appendChild(featureTypeText);
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updateInfoWindow(content, event.latLng);
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}
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// [START maps_boundaries_click_event_style]
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// Define styles.
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// Stroke and fill with minimum opacity value.
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const styleDefault = {
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strokeColor: '#810FCB',
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strokeOpacity: 1.0,
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strokeWeight: 2.0,
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fillColor: 'white',
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fillOpacity: 0.1, // Polygons must be visible to receive events.
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};
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// Style for the clicked polygon.
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const styleClicked = {
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...styleDefault,
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fillColor: '#810FCB',
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fillOpacity: 0.5,
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};
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// Style for polygon on mouse move.
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const styleMouseMove = {
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...styleDefault,
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strokeWeight: 4.0,
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};
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// Apply styles using a feature style function.
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function applyStyle(/* FeatureStyleFunctionOptions */ params) {
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const placeId = params.feature.placeId;
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//@ts-ignore
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if (lastClickedFeatureIds.includes(placeId)) {
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return styleClicked;
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}
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//@ts-ignore
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if (lastInteractedFeatureIds.includes(placeId)) {
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return styleMouseMove;
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}
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return styleDefault;
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}
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// [END maps_boundaries_click_event_style]
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// Helper function to create an info window.
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function updateInfoWindow(content, center) {
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infoWindow.setContent(content);
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infoWindow.setPosition(center);
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infoWindow.open({
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map: innerMap,
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shouldFocus: false,
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});
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}
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initMap();
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// [END maps_boundaries_click_event]

‎samples/boundaries-click/package.json‎

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{
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"name": "@js-api-samples/boundaries-click",
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"version": "1.0.0",
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"scripts": {
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"build": "tsc && bash ../jsfiddle.sh boundaries-click && bash ../app.sh boundaries-click && bash ../docs.sh boundaries-click && npm run build:vite --workspace=. && bash ../dist.sh boundaries-click",
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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/boundaries-click/style.css‎

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/**
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* @license
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* Copyright 2025 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_boundaries_click_event] */
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/*
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* Always set the map height explicitly to define the size of the div element
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* that contains the map.
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*/
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gmp-map {
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height: 100%;
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}
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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_boundaries_click_event] */

‎samples/boundaries-click/tsconfig.json‎

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{
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"compilerOptions": {
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"module": "esnext",
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"target": "esnext",
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"strict": true,
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"noImplicitAny": false,
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"lib": [
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"es2015",
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"esnext",
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"es6",
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"dom",
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"dom.iterable"
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],
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"moduleResolution": "Node",
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"jsx": "preserve"
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}
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}

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