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feat: Migrates the dds-datasets-polygon-click sample. (#1080)
* feat: Migrates the dds-datasets-polygon-click sample. * Update index.ts * Refactor event listener addition for dataset layer * Refactor applyStyle function to simplify checks Remove unnecessary check for datasetAttributes in applyStyle function. * Comment out mousemove listener in index.ts Temporarily comment out mousemove event listener for testing. * Restore commented stanza Done testing, sorry to say that didn't move the needle. * Swap 'globalid' for 'typecategory' in feature ID checks temporary change from 'globalid' to 'typecategory' in feature ID checks. This will help us to determine if globalid has a role in the 400 errors in the tests. * Restore usage of 'globalid' in feature checks Reverted changes to use 'globalid' attribute for feature identification.
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‎samples/dds-datasets-polygon-click/README.md‎

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# Google Maps JavaScript Sample
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## dds-datasets-polygon-click
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This sample shows how to make data features respond to mouse events.
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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/dds-datasets-polygon-click`
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`npm start`
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### Build an individual example
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`cd samples/dds-datasets-polygon-click`
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`npm run build`
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From 'samples':
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`npm run build --workspace=dds-datasets-polygon-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/dds-datasets-polygon-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/dds-datasets-polygon-click/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_dds_datasets_polygon_click] -->
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<html>
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<head>
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<title>Style a polygon data feature</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
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center="40.780101, -73.967780"
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zoom="13"
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map-id="5cd2c9ca1cf05670"
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map-type-control="false">
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<div id="attribution" slot="control-block-end-inline-start">
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Data source: NYC Open Data
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</div>
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</gmp-map>
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</body>
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</html>
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<!-- [END maps_dds_datasets_polygon_click] -->

‎samples/dds-datasets-polygon-click/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_dds_datasets_polygon_click]
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const mapElement = document.querySelector('gmp-map') as google.maps.MapElement;
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let innerMap;
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let lastInteractedFeatureIds: string[] = [];
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let lastClickedFeatureIds: string[] = [];
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let datasetLayer;
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// [START maps_dds_datasets_polygon_click_eventhandler]
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// Note, 'globalid' is an attribute in this Dataset.
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function handleClick(/* MouseEvent */ e) {
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if (e.features) {
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lastClickedFeatureIds = e.features.map(
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(f) => f.datasetAttributes['globalid']
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);
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}
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datasetLayer.style = applyStyle;
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}
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function handleMouseMove(/* MouseEvent */ e) {
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if (e.features) {
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lastInteractedFeatureIds = e.features.map(
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(f) => f.datasetAttributes['globalid']
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);
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}
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datasetLayer.style = applyStyle;
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}
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// [END maps_dds_datasets_polygon_click_eventhandler]
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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 inner map.
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innerMap = mapElement.innerMap;
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// Dataset ID for NYC park data.
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const datasetId = 'a75dd002-ad20-4fe6-af60-27cd2ed636b4';
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// [START maps_dds_datasets_polygon_click_addlistener]
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datasetLayer = innerMap.getDatasetFeatureLayer(datasetId);
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datasetLayer.style = applyStyle;
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datasetLayer.addListener('click', handleClick);
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datasetLayer.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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datasetLayer.style = applyStyle;
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}
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});
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// [END maps_dds_datasets_polygon_click_addlistener]
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}
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// [START maps_dds_datasets_polygon_click_stylefunction]
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const styleDefault = {
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strokeColor: 'green',
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strokeWeight: 2.0,
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strokeOpacity: 1.0,
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fillColor: 'green',
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fillOpacity: 0.3,
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};
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const styleClicked = {
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...styleDefault,
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strokeColor: 'blue',
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fillColor: 'blue',
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fillOpacity: 0.5,
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};
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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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function applyStyle(/* FeatureStyleFunctionOptions */ params) {
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const datasetFeature = params.feature;
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// Note, 'globalid' is an attribute in this dataset.
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if (
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lastClickedFeatureIds.includes(
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datasetFeature.datasetAttributes['globalid']
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)
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) {
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return styleClicked;
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}
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if (
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lastInteractedFeatureIds.includes(
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datasetFeature.datasetAttributes['globalid']
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)
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) {
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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_dds_datasets_polygon_click_stylefunction]
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initMap();
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// [END maps_dds_datasets_polygon_click]

‎samples/dds-datasets-polygon-click/package.json‎

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{
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"name": "@js-api-samples/dds-datasets-polygon-click",
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"version": "1.0.0",
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"scripts": {
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"build": "tsc && bash ../jsfiddle.sh dds-datasets-polygon-click && bash ../app.sh dds-datasets-polygon-click && bash ../docs.sh dds-datasets-polygon-click && npm run build:vite --workspace=. && bash ../dist.sh dds-datasets-polygon-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/dds-datasets-polygon-click/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_dds_datasets_polygon_click] */
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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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#attribution {
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background-color: rgba(255, 255, 255, 0.7);
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font-family: 'Roboto', 'Arial', 'sans-serif';
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font-size: 10px;
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padding: 2px;
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margin: 2px;
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}
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/* [END maps_dds_datasets_polygon_click] */

‎samples/dds-datasets-polygon-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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