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feat: Migrates the control-custom-state sample.
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‎samples/control-custom-state/README.md‎

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# Google Maps JavaScript Sample
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## control-custom-state
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This example demonstrates adding controls that store state.
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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/control-custom-state`
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`npm start`
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### Build an individual example
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`cd samples/control-custom-state`
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`npm run build`
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From 'samples':
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`npm run build --workspace=control-custom-state/`
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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/control-custom-state`
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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/control-custom-state/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_control_custom_state] -->
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<html>
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<head>
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<title>Adding State to Controls</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="41.85, -87.65" zoom="12">
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<div
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class="custom-control"
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slot="control-block-start-inline-center">
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<input
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type="button"
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class="button"
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id="btnCenterMap"
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value="Center Map"
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title="Click to recenter the map." />
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<input
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type="button"
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class="button"
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id="btnSetCenter"
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value="Set Center"
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title="Click to change the center of the map." />
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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_control_custom_state] -->

‎samples/control-custom-state/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_control_custom_state]
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let innerMap;
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const mapElement = document.querySelector('gmp-map') as google.maps.MapElement;
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let center: google.maps.LatLngLiteral = { lat: 41.85, lng: -87.65 };
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async function initMap() {
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(await google.maps.importLibrary('maps')) as google.maps.MapsLibrary;
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innerMap = mapElement.innerMap;
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// Get the button UI elements.
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const setCenterButton = document.getElementById('btnCenterMap') as HTMLInputElement;
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const resetCenterButton = document.getElementById('btnSetCenter') as HTMLInputElement;
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// [START maps_control_custom_state_event_listeners]
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// Set up the click event listener for the 'Center Map' button. Set the map
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// to the currently stored center.
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setCenterButton.addEventListener('click', () => {
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const currentCenter = center;
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innerMap.setCenter(currentCenter);
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});
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// Set up the click event listener for 'Set Center': Set the center of
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// the control to the current center of the map.
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resetCenterButton.addEventListener('click', () => {
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const newCenter = innerMap.getCenter();
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if (newCenter) {
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center = newCenter;
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}
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});
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// [END maps_control_custom_state_event_listeners]
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}
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initMap();
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// [END maps_control_custom_state]

‎samples/control-custom-state/package.json‎

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{
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"name": "@js-api-samples/control-custom-state",
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"version": "1.0.0",
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"scripts": {
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"build": "tsc && bash ../jsfiddle.sh control-custom-state && bash ../app.sh control-custom-state && bash ../docs.sh control-custom-state && npm run build:vite --workspace=. && bash ../dist.sh control-custom-state",
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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/control-custom-state/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_control_custom_state] */
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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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#btnCenterMap,
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#btnSetCenter {
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background-color: #fff;
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border: 2px solid #fff;
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border-radius: 3px;
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box-shadow: 0 2px 6px rgba(0, 0, 0, 0.3);
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cursor: pointer;
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float: left;
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margin-bottom: 22px;
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margin-top: 5px;
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text-align: center;
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color: rgb(25, 25, 25);
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font-family: Roboto, Arial, sans-serif;
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font-size: 15px;
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line-height: 25px;
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}
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#btnSetCenter {
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margin-left: 12px;
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}
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/* [END maps_control_custom_state] */

‎samples/control-custom-state/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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