googlemaps-samples · willum070 · Oct 28, 2025
diff --git a/samples/boundaries-choropleth/README.md b/samples/boundaries-choropleth/README.md
@@ -0,0 +1,40 @@
+# Google Maps JavaScript Sample
+
+This sample is generated from @googlemaps/js-samples located at
+https://github.com/googlemaps-samples/js-api-samples.
+
+## Setup
+
+### Before starting run:
+
+`npm i`
+
+### Run an example on a local web server
+
+`cd samples/boundaries-choropleth`
+`npm start`
+
+### Build an individual example
+
+`cd samples/boundaries-choropleth`
+`npm run build`
+
+From 'samples':
+
+`npm run build --workspace=boundaries-choropleth/`
+
+### Build all of the examples.
+
+From 'samples':
+
+`npm run build-all`
+
+### Run lint to check for problems
+
+`cd samples/boundaries-choropleth`
+`npx eslint index.ts` 
+
+## Feedback
+
+For feedback related to this sample, please open a new issue on
+[GitHub](https://github.com/googlemaps-samples/js-api-samples/issues).
diff --git a/samples/boundaries-choropleth/index.html b/samples/boundaries-choropleth/index.html
@@ -0,0 +1,22 @@
+<!doctype html>
+<!--
+ @license
+ Copyright 2025 Google LLC. All Rights Reserved.
+ SPDX-License-Identifier: Apache-2.0
+-->
+<!-- [START maps_boundaries_choropleth] -->
+<html>
+  <head>
+    <title>Choropleth Map</title>
+
+    <link rel="stylesheet" type="text/css" href="./style.css" />
+    <script type="module" src="./index.js"></script>
+    <!-- prettier-ignore -->
+    <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))})
+        ({key: "AIzaSyB41DRUbKWJHPxaFjMAwdrzWzbVKartNGg", v: "weekly"});</script>
+  </head>
+  <body>
+    <gmp-map center="40.76,-101.64" zoom="5" map-id="8b37d7206ccf01219cd548d3">
+  </body>
+</html>
+<!-- [END maps_boundaries_choropleth] -->
diff --git a/samples/boundaries-choropleth/index.ts b/samples/boundaries-choropleth/index.ts
@@ -0,0 +1,108 @@
+/**
+ * @license
+ * Copyright 2025 Google LLC. All Rights Reserved.
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+// [START maps_boundaries_choropleth]
+async function initMap() {
+    // Request needed libraries.
+    (await google.maps.importLibrary('maps')) as google.maps.MapsLibrary;
+
+    // Get the gmp-map element.
+    const mapElement = document.querySelector(
+        'gmp-map'
+    ) as google.maps.MapElement;
+
+    // Get the inner map.
+    const innerMap = mapElement.innerMap;
+
+    const featureLayer = innerMap.getFeatureLayer(
+        google.maps.FeatureType.ADMINISTRATIVE_AREA_LEVEL_1
+    );
+
+    // [START maps_boundaries_choropleth_style_function]
+    featureLayer.style = (featureStyleFunctionOptions) => {
+        const placeFeature =
+            featureStyleFunctionOptions.feature as google.maps.PlaceFeature;
+        const population = states[placeFeature.placeId];
+
+        let fillColor;
+        // Specify colors using any of the following:
+        // * Named ('green')
+        // * Hexadecimal ('#FF0000')
+        // * RGB ('rgb(0, 0, 255)')
+        // * HSL ('hsl(60, 100%, 50%)')
+
+        if (population < 2000000) {
+            fillColor = 'green';
+        } else if (population < 5000000) {
+            fillColor = 'red';
+        } else if (population < 10000000) {
+            fillColor = 'blue';
+        } else if (population < 40000000) {
+            fillColor = 'yellow';
+        }
+        return {
+            fillColor,
+            fillOpacity: 0.5,
+        };
+    };
+    // [END maps_boundaries_choropleth_style_function]
+    // Population data by state.
+    const states = {
+        'ChIJdf5LHzR_hogR6czIUzU0VV4': 5039877, // Alabama
+        'ChIJG8CuwJzfAFQRNduKqSde27w': 732673, // Alaska
+        'ChIJaxhMy-sIK4cRcc3Bf7EnOUI': 7276316, // Arizona
+        'ChIJYSc_dD-e0ocR0NLf_z5pBaQ': 3025891, // Arkansas
+        'ChIJPV4oX_65j4ARVW8IJ6IJUYs': 39237836, // California
+        'ChIJt1YYm3QUQIcR_6eQSTGDVMc': 5812069, // Colorado
+        'ChIJpVER8hFT5okR5XBhBVttmq4': 3605597, // Connecticut
+        'ChIJO9YMTXYFx4kReOgEjBItHZQ': 1003384, // Delaware
+        'ChIJvypWkWV2wYgR0E7HW9MTLvc': 21781128, // Florida
+        'ChIJV4FfHcU28YgR5xBP7BC8hGY': 10799566, // Georgia
+        'ChIJBeB5Twbb_3sRKIbMdNKCd0s': 1441553, // Hawaii
+        'ChIJ6Znkhaj_WFMRWIf3FQUwa9A': 1900923, // Idaho
+        'ChIJGSZubzgtC4gRVlkRZFCCFX8': 12671469, // Illinois
+        'ChIJHRv42bxQa4gRcuwyy84vEH4': 6805985, // Indiana
+        'ChIJGWD48W9e7ocR2VnHV0pj78Y': 3193079, // Iowa
+        'ChIJawF8cXEXo4cRXwk-S6m0wmg': 2934582, // Kansas
+        'ChIJyVMZi0xzQogR_N_MxU5vH3c': 4509394, // Kentucky
+        'ChIJZYIRslSkIIYRA0flgTL3Vck': 4624047, // Louisiana
+        'ChIJ1YpTHd4dsEwR0KggZ2_MedY': 1372247, // Maine
+        'ChIJ35Dx6etNtokRsfZVdmU3r_I': 6165129, // Maryland
+        'ChIJ_b9z6W1l44kRHA2DVTbQxkU': 6984723, // Massachussetts
+        'ChIJEQTKxz2qTE0Rs8liellI3Zc': 10050811, // Michigan
+        'ChIJmwt4YJpbWE0RD6L-EJvJogI': 5707390, // Minnesota
+        'ChIJGdRK5OQyKIYR2qbc6X8XDWI': 2949965, // Mississippi
+        'ChIJfeMiSNXmwIcRcr1mBFnEW7U': 6168187, // Misssouri
+        'ChIJ04p7LZwrQVMRGGwqz1jWcfU': 1104271, // Montana
+        'ChIJ7fwMtciNk4cRxArzDwyQJ6E': 1963692, // Nebraska
+        'ChIJcbTe-KEKmYARs5X8qooDR88': 3143991, // Nevada
+        'ChIJ66bAnUtEs0wR64CmJa8CyNc': 1388992, // New Hampshire
+        'ChIJn0AAnpX7wIkRjW0_-Ad70iw': 9267130, // New Jersey
+        'ChIJqVKY50NQGIcRup41Yxpuv0Y': 2115877, // New Mexico
+        'ChIJqaUj8fBLzEwRZ5UY3sHGz90': 19835913, // New York
+        'ChIJgRo4_MQfVIgRGa4i6fUwP60': 10551162, // North Carolina
+        'ChIJY-nYVxKD11IRyc9egzmahA0': 774948, // North Dakota
+        'ChIJwY5NtXrpNogRFtmfnDlkzeU': 11780017, // Ohio
+        'ChIJnU-ssRE5rIcRSOoKQDPPHF0': 3986639, // Oklahoma
+        'ChIJVWqfm3xuk1QRdrgLettlTH0': 4246155, // Oregon
+        'ChIJieUyHiaALYgRPbQiUEchRsI': 12964056, // Pennsylvania
+        'ChIJD9cOYhQ15IkR5wbB57wYTh4': 1095610, // Rhode Island
+        'ChIJ49ExeWml-IgRnhcF9TKh_7k': 5190705, // South Carolina
+        'ChIJpTjphS1DfYcRt6SGMSnW8Ac': 895376, // South Dakota
+        'ChIJA8-XniNLYYgRVpGBpcEgPgM': 6975218, // Tennessee
+        'ChIJSTKCCzZwQIYRPN4IGI8c6xY': 29527941, // Texas
+        'ChIJzfkTj8drTIcRP0bXbKVK370': 3337975, // Utah
+        'ChIJ_87aSGzctEwRtGtUNnSJTSY': 645570, // Vermont
+        'ChIJzbK8vXDWTIgRlaZGt0lBTsA': 8642274, // Virginia
+        'ChIJ-bDD5__lhVQRuvNfbGh4QpQ': 7738692, // Washington
+        'ChIJRQnL1KVUSogRQzrN3mjHALs': 1782959, // West Virginia
+        'ChIJr-OEkw_0qFIR1kmG-LjV1fI': 5895908, // Wisconsin
+        'ChIJaS7hSDTiXocRLzh90nkisCY': 578803, // Wyoming
+    };
+}
+
+initMap();
+// [END maps_boundaries_choropleth]
diff --git a/samples/boundaries-choropleth/package.json b/samples/boundaries-choropleth/package.json
@@ -0,0 +1,14 @@
+{
+  "name": "@js-api-samples/boundaries-choropleth",
+  "version": "1.0.0",
+  "scripts": {
+    "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",
+    "test": "tsc && npm run build:vite --workspace=.",
+    "start": "tsc && vite build --base './' && vite",
+    "build:vite": "vite build --base './'",
+    "preview": "vite preview"
+  },
+  "dependencies": {
+
+  }
+}
diff --git a/samples/boundaries-choropleth/style.css b/samples/boundaries-choropleth/style.css
@@ -0,0 +1,25 @@
+/**
+ * @license
+ * Copyright 2025 Google LLC. All Rights Reserved.
+ * SPDX-License-Identifier: Apache-2.0
+ */
+/* [START maps_boundaries_choropleth] */
+/* 
+ * Always set the map height explicitly to define the size of the div element
+ * that contains the map. 
+ */
+gmp-map {
+  height: 100%;
+}
+
+/* 
+ * Optional: Makes the sample page fill the window. 
+ */
+html,
+body {
+  height: 100%;
+  margin: 0;
+  padding: 0;
+}
+
+/* [END maps_boundaries_choropleth] */
diff --git a/samples/boundaries-choropleth/tsconfig.json b/samples/boundaries-choropleth/tsconfig.json
@@ -0,0 +1,17 @@
+{
+  "compilerOptions": {
+    "module": "esnext",
+    "target": "esnext",
+    "strict": true,
+    "noImplicitAny": false,
+    "lib": [
+      "es2015",
+      "esnext",
+      "es6",
+      "dom",
+      "dom.iterable"
+    ],
+    "moduleResolution": "Node",
+    "jsx": "preserve"
+  }
+}