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feat: Migrate layer data event sample (#1024)
* feat: Migrates the layer-data-event sample. * feat: Updates layer-data-event to current standards.
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‎samples/layer-data-event/README.md‎

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# Google Maps JavaScript Sample
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## layer-data-event
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This example uses a data layer to dynamically display information about a KML feature object when under the mouse cursor.
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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/layer-data-event`
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`npm start`
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### Build an individual example
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`cd samples/layer-data-event`
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`npm run build`
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From 'samples':
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`npm run build --workspace=layer-data-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/layer-data-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/layer-data-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_layer_data_event] -->
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<html>
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<head>
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<title>Data Layer: Event Handling</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="-28,137" zoom="4"></gmp-map>
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<div id="info-box">?</div>
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</body>
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</html>
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<!-- [END maps_layer_data_event] -->

‎samples/layer-data-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_layer_data_event]
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let map: google.maps.Map;
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async function initMap() {
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(await google.maps.importLibrary('maps')) as google.maps.MapsLibrary;
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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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const innerMap = mapElement.innerMap;
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// Load GeoJSON.
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innerMap.data.loadGeoJson('google.json');
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// Add some style.
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innerMap.data.setStyle((feature) => {
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return /** @type {google.maps.Data.StyleOptions} */ {
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fillColor: feature.getProperty('color') as string,
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strokeWeight: 1,
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};
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});
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// [START maps_layer_data_event_snippet]
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// Set mouseover event for each feature.
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innerMap.data.addListener('mouseover', (event) => {
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(document.getElementById('info-box') as HTMLElement).textContent =
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event.feature.getProperty('letter');
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});
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// [END maps_layer_data_event_snippet]
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}
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initMap();
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// [END maps_layer_data_event]

‎samples/layer-data-event/package.json‎

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{
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"name": "@js-api-samples/layer-data-event",
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"version": "1.0.0",
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"scripts": {
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"build": "tsc && bash ../jsfiddle.sh layer-data-event && bash ../app.sh layer-data-event && bash ../docs.sh layer-data-event && npm run build:vite --workspace=. && bash ../dist.sh layer-data-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/layer-data-event/public/google.json‎

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{
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"type": "FeatureCollection",
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"features": [
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{
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"type": "Feature",
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"properties": {
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"letter": "G",
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"color": "blue",
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"rank": "7",
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"ascii": "71"
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},
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"geometry": {
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"type": "Polygon",
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"coordinates": [
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[
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[123.61, -22.14], [122.38, -21.73], [121.06, -21.69], [119.66, -22.22], [119.00, -23.40],
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[118.65, -24.76], [118.43, -26.07], [118.78, -27.56], [119.22, -28.57], [120.23, -29.49],
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[121.77, -29.87], [123.57, -29.64], [124.45, -29.03], [124.71, -27.95], [124.80, -26.70],
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[124.80, -25.60], [123.61, -25.64], [122.56, -25.64], [121.72, -25.72], [121.81, -26.62],
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[121.86, -26.98], [122.60, -26.90], [123.57, -27.05], [123.57, -27.68], [123.35, -28.18],
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[122.51, -28.38], [121.77, -28.26], [121.02, -27.91], [120.49, -27.21], [120.14, -26.50],
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[120.10, -25.64], [120.27, -24.52], [120.67, -23.68], [121.72, -23.32], [122.43, -23.48],
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[123.04, -24.04], [124.54, -24.28], [124.58, -23.20], [123.61, -22.14]
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]
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]
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}
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},
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{
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"type": "Feature",
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"properties": {
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"letter": "o",
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"color": "red",
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"rank": "15",
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"ascii": "111"
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},
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"geometry": {
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"type": "Polygon",
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"coordinates": [
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[
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[128.84, -25.76], [128.18, -25.60], [127.96, -25.52], [127.88, -25.52], [127.70, -25.60],
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[127.26, -25.79], [126.60, -26.11], [126.16, -26.78], [126.12, -27.68], [126.21, -28.42],
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[126.69, -29.49], [127.74, -29.80], [128.80, -29.72], [129.41, -29.03], [129.72, -27.95],
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[129.68, -27.21], [129.33, -26.23], [128.84, -25.76]
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],
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[
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[128.45, -27.44], [128.32, -26.94], [127.70, -26.82], [127.35, -27.05], [127.17, -27.80],
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[127.57, -28.22], [128.10, -28.42], [128.49, -27.80], [128.45, -27.44]
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]
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]
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}
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},
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{
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"type": "Feature",
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"properties": {
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"letter": "o",
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"color": "yellow",
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"rank": "15",
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"ascii": "111"
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},
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"geometry": {
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"type": "Polygon",
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"coordinates": [
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[
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[131.87, -25.76], [131.35, -26.07], [130.95, -26.78], [130.82, -27.64], [130.86, -28.53],
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[131.26, -29.22], [131.92, -29.76], [132.45, -29.87], [133.06, -29.76], [133.72, -29.34],
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[134.07, -28.80], [134.20, -27.91], [134.07, -27.21], [133.81, -26.31], [133.37, -25.83],
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[132.71, -25.64], [131.87, -25.76]
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],
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[
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[133.15, -27.17], [132.71, -26.86], [132.09, -26.90], [131.74, -27.56], [131.79, -28.26],
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[132.36, -28.45], [132.93, -28.34], [133.15, -27.76], [133.15, -27.17]
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]
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]
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}
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},
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{
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"type": "Feature",
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"properties": {
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"letter": "g",
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"color": "blue",
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"rank": "7",
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"ascii": "103"
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},
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"geometry": {
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"type": "Polygon",
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"coordinates": [
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[
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[138.12, -25.04], [136.84, -25.16], [135.96, -25.36], [135.26, -25.99], [135, -26.90],
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[135.04, -27.91], [135.26, -28.88], [136.05, -29.45], [137.02, -29.49], [137.81, -29.49],
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[137.94, -29.99], [137.90, -31.20], [137.85, -32.24], [136.88, -32.69], [136.45, -32.36],
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[136.27, -31.80], [134.95, -31.84], [135.17, -32.99], [135.52, -33.43], [136.14, -33.76],
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[137.06, -33.83], [138.12, -33.65], [138.86, -33.21], [139.30, -32.28], [139.30, -31.24],
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[139.30, -30.14], [139.21, -28.96], [139.17, -28.22], [139.08, -27.41], [139.08, -26.47],
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[138.99, -25.40], [138.73, -25.00 ], [138.12, -25.04]
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],
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[
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[137.50, -26.54], [136.97, -26.47], [136.49, -26.58], [136.31, -27.13], [136.31, -27.72],
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[136.58, -27.99], [137.50, -28.03], [137.68, -27.68], [137.59, -26.78], [137.50, -26.54]
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]
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]
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}
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},
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{
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"type": "Feature",
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"properties": {
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"letter": "l",
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"color": "green",
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"rank": "12",
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"ascii": "108"
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},
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"geometry": {
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"type": "Polygon",
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"coordinates": [
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[
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[140.14,-21.04], [140.31,-29.42], [141.67,-29.49], [141.59,-20.92], [140.14,-21.04]
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]
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]
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}
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},
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{
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"type": "Feature",
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"properties": {
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"letter": "e",
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"color": "red",
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"rank": "5",
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"ascii": "101"
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},
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"geometry": {
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"type": "Polygon",
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"coordinates": [
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[
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[144.14, -27.41], [145.67, -27.52], [146.86, -27.09], [146.82, -25.64], [146.25, -25.04],
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[145.45, -24.68], [144.66, -24.60], [144.09, -24.76], [143.43, -25.08], [142.99, -25.40],
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[142.64, -26.03], [142.64, -27.05], [142.64, -28.26], [143.30, -29.11], [144.18, -29.57],
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[145.41, -29.64], [146.46, -29.19], [146.64, -28.72], [146.82, -28.14], [144.84, -28.42],
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[144.31, -28.26], [144.14, -27.41]
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],
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[
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[144.18, -26.39], [144.53, -26.58], [145.19, -26.62], [145.72, -26.35], [145.81, -25.91],
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[145.41, -25.68], [144.97, -25.68], [144.49, -25.64], [144, -25.99], [144.18, -26.39]
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]
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]
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}
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}
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]
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}

‎samples/layer-data-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_layer_data_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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#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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#info-box {
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background-color: white;
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border: 1px solid black;
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bottom: 30px;
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height: 20px;
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padding: 10px;
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position: absolute;
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left: 30px;
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}
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/* [END maps_layer_data_event] */

‎samples/layer-data-event/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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