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feat: Migrates the boundaries-choropleth sample; standards update. (#878)
* feat: Migrates the boundaries-choropleth sample. * Update Google Maps API key in index.html
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‎samples/boundaries-choropleth/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-choropleth`
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`npm start`
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### Build an individual example
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`cd samples/boundaries-choropleth`
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`npm run build`
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From 'samples':
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`npm run build --workspace=boundaries-choropleth/`
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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-choropleth`
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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-choropleth/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_choropleth] -->
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<html>
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<head>
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<title>Choropleth Map</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="40.76,-101.64" zoom="5" map-id="8b37d7206ccf01219cd548d3">
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</body>
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</html>
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<!-- [END maps_boundaries_choropleth] -->

‎samples/boundaries-choropleth/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_choropleth]
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async function initMap() {
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// Request needed libraries.
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(await google.maps.importLibrary('maps')) 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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const innerMap = mapElement.innerMap;
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const featureLayer = innerMap.getFeatureLayer(
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google.maps.FeatureType.ADMINISTRATIVE_AREA_LEVEL_1
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);
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// [START maps_boundaries_choropleth_style_function]
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featureLayer.style = (featureStyleFunctionOptions) => {
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const placeFeature =
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featureStyleFunctionOptions.feature as google.maps.PlaceFeature;
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const population = states[placeFeature.placeId];
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let fillColor;
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// Specify colors using any of the following:
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// * Named ('green')
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// * Hexadecimal ('#FF0000')
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// * RGB ('rgb(0, 0, 255)')
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// * HSL ('hsl(60, 100%, 50%)')
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if (population < 2000000) {
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fillColor = 'green';
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} else if (population < 5000000) {
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fillColor = 'red';
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} else if (population < 10000000) {
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fillColor = 'blue';
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} else if (population < 40000000) {
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fillColor = 'yellow';
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}
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return {
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fillColor,
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fillOpacity: 0.5,
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};
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};
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// [END maps_boundaries_choropleth_style_function]
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// Population data by state.
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const states = {
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'ChIJdf5LHzR_hogR6czIUzU0VV4': 5039877, // Alabama
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'ChIJG8CuwJzfAFQRNduKqSde27w': 732673, // Alaska
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'ChIJaxhMy-sIK4cRcc3Bf7EnOUI': 7276316, // Arizona
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'ChIJYSc_dD-e0ocR0NLf_z5pBaQ': 3025891, // Arkansas
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'ChIJPV4oX_65j4ARVW8IJ6IJUYs': 39237836, // California
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'ChIJt1YYm3QUQIcR_6eQSTGDVMc': 5812069, // Colorado
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'ChIJpVER8hFT5okR5XBhBVttmq4': 3605597, // Connecticut
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'ChIJO9YMTXYFx4kReOgEjBItHZQ': 1003384, // Delaware
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'ChIJvypWkWV2wYgR0E7HW9MTLvc': 21781128, // Florida
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'ChIJV4FfHcU28YgR5xBP7BC8hGY': 10799566, // Georgia
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'ChIJBeB5Twbb_3sRKIbMdNKCd0s': 1441553, // Hawaii
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'ChIJ6Znkhaj_WFMRWIf3FQUwa9A': 1900923, // Idaho
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'ChIJGSZubzgtC4gRVlkRZFCCFX8': 12671469, // Illinois
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'ChIJHRv42bxQa4gRcuwyy84vEH4': 6805985, // Indiana
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'ChIJGWD48W9e7ocR2VnHV0pj78Y': 3193079, // Iowa
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'ChIJawF8cXEXo4cRXwk-S6m0wmg': 2934582, // Kansas
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'ChIJyVMZi0xzQogR_N_MxU5vH3c': 4509394, // Kentucky
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'ChIJZYIRslSkIIYRA0flgTL3Vck': 4624047, // Louisiana
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'ChIJ1YpTHd4dsEwR0KggZ2_MedY': 1372247, // Maine
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'ChIJ35Dx6etNtokRsfZVdmU3r_I': 6165129, // Maryland
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'ChIJ_b9z6W1l44kRHA2DVTbQxkU': 6984723, // Massachussetts
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'ChIJEQTKxz2qTE0Rs8liellI3Zc': 10050811, // Michigan
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'ChIJmwt4YJpbWE0RD6L-EJvJogI': 5707390, // Minnesota
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'ChIJGdRK5OQyKIYR2qbc6X8XDWI': 2949965, // Mississippi
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'ChIJfeMiSNXmwIcRcr1mBFnEW7U': 6168187, // Misssouri
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'ChIJ04p7LZwrQVMRGGwqz1jWcfU': 1104271, // Montana
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'ChIJ7fwMtciNk4cRxArzDwyQJ6E': 1963692, // Nebraska
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'ChIJcbTe-KEKmYARs5X8qooDR88': 3143991, // Nevada
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'ChIJ66bAnUtEs0wR64CmJa8CyNc': 1388992, // New Hampshire
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'ChIJn0AAnpX7wIkRjW0_-Ad70iw': 9267130, // New Jersey
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'ChIJqVKY50NQGIcRup41Yxpuv0Y': 2115877, // New Mexico
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'ChIJqaUj8fBLzEwRZ5UY3sHGz90': 19835913, // New York
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'ChIJgRo4_MQfVIgRGa4i6fUwP60': 10551162, // North Carolina
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'ChIJY-nYVxKD11IRyc9egzmahA0': 774948, // North Dakota
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'ChIJwY5NtXrpNogRFtmfnDlkzeU': 11780017, // Ohio
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'ChIJnU-ssRE5rIcRSOoKQDPPHF0': 3986639, // Oklahoma
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'ChIJVWqfm3xuk1QRdrgLettlTH0': 4246155, // Oregon
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'ChIJieUyHiaALYgRPbQiUEchRsI': 12964056, // Pennsylvania
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'ChIJD9cOYhQ15IkR5wbB57wYTh4': 1095610, // Rhode Island
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'ChIJ49ExeWml-IgRnhcF9TKh_7k': 5190705, // South Carolina
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'ChIJpTjphS1DfYcRt6SGMSnW8Ac': 895376, // South Dakota
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'ChIJA8-XniNLYYgRVpGBpcEgPgM': 6975218, // Tennessee
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'ChIJSTKCCzZwQIYRPN4IGI8c6xY': 29527941, // Texas
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'ChIJzfkTj8drTIcRP0bXbKVK370': 3337975, // Utah
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'ChIJ_87aSGzctEwRtGtUNnSJTSY': 645570, // Vermont
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'ChIJzbK8vXDWTIgRlaZGt0lBTsA': 8642274, // Virginia
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'ChIJ-bDD5__lhVQRuvNfbGh4QpQ': 7738692, // Washington
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'ChIJRQnL1KVUSogRQzrN3mjHALs': 1782959, // West Virginia
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'ChIJr-OEkw_0qFIR1kmG-LjV1fI': 5895908, // Wisconsin
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'ChIJaS7hSDTiXocRLzh90nkisCY': 578803, // Wyoming
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};
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}
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initMap();
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// [END maps_boundaries_choropleth]

‎samples/boundaries-choropleth/package.json‎

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

‎samples/boundaries-choropleth/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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