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feat: Migrates the event-properties sample to js-api-samples. (#1316)
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‎samples/event-properties/README.md‎

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# Google Maps JavaScript Sample
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## event-properties
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This sample demonstrates how to get properties from event handlers in the Maps JavaScript API.
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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/event-properties`
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`npm start`
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### Build an individual example
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`cd samples/event-properties`
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`npm run build`
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From 'samples':
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`npm run build --workspace=event-properties/`
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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/event-properties`
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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/event-properties/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_event_properties] -->
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<html>
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<head>
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<title>Getting Properties With Event Handlers</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="-25.363882,131.044922" zoom="4" map-id="DEMO_MAP_ID"></gmp-map>
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</body>
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</html>
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<!-- [END maps_event_properties] -->

‎samples/event-properties/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_event_properties]
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async function initMap() {
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// Request needed libraries.
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const { Map } = await google.maps.importLibrary("maps") as google.maps.MapsLibrary;
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const mapElement = document.querySelector('gmp-map') as google.maps.MapElement;
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const innerMap = mapElement.innerMap;
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const infowindow = new google.maps.InfoWindow({
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content: "Change the zoom level",
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position: mapElement.center,
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});
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infowindow.open(innerMap);
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innerMap.addListener("zoom_changed", () => {
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infowindow.setContent("Zoom: " + innerMap.getZoom()!);
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});
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}
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initMap();
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// [END maps_event_properties]

‎samples/event-properties/package.json‎

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

‎samples/event-properties/tsconfig.json‎

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{
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"extends": "../../tsconfig.base.json",
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"compilerOptions": {
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"rootDir": "."
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},
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"include": [
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"./*.ts",
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]
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}

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