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feat: Migrates the circle-simple sample. (#1098)
* feat: Migrates the circle-simple sample. * Add comment for control panel display property Added comment to clarify display property usage.
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‎samples/circle-simple/README.md‎

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# Google Maps JavaScript Sample
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## circle-simple
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This sample demonstrates using the [Circle class](https://developers.google.com/maps/documentation/javascript/reference/next/polygon?hl=en#Circle)
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to show approximate walking times between locations in Kyoto, Japan.
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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/circle-simple`
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`npm start`
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### Build an individual example
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`cd samples/circle-simple`
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`npm run build`
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From 'samples':
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`npm run build --workspace=circle-simple/`
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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/circle-simple`
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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/circle-simple/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_circle_simple] -->
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<html>
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<head>
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<title>Circles</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="34.98956821576194, 135.74239981260283"
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zoom="15"
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map-id="DEMO_MAP_ID">
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<div id="control-panel" slot="control-inline-start-block-start">
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<input
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id="short-walk"
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type="radio"
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name="radius"
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value="400"
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checked />
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<label for="short-walk">Short Walk (~5 minutes)</label><br />
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<input
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id="medium-walk"
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type="radio"
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name="radius"
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value="800" />
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<label for="medium-walk">Medium Walk (~15 minutes)</label><br />
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<input id="long-walk" type="radio" name="radius" value="1600" />
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<label for="long-walk">Long Walk (~30 minutes) </label>
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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_circle_simple] -->

‎samples/circle-simple/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_circle_simple]
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const mapElement = document.querySelector('gmp-map') as google.maps.MapElement;
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let innerMap;
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async function initMap() {
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// Import the needed libraries.
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// Request needed libraries.
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(await google.maps.importLibrary('maps')) as google.maps.MapsLibrary;
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(await google.maps.importLibrary('marker')) as google.maps.MarkerLibrary;
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// Get the gmp-map element.
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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 initialCenter = { lat: 34.98956821576194, lng: 135.74239981260283 }; // Hotel Emion, Kyoto, Japan
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// Get the inner map.
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const innerMap = mapElement.innerMap;
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const buttons = document.querySelectorAll('input[name="radius"]');
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const walkingCircle = new google.maps.Circle({
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strokeColor: '#ffdd00ff',
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strokeOpacity: 0.8,
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strokeWeight: 2,
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fillColor: '#ffdd00ff',
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fillOpacity: 0.35,
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map: innerMap,
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center: initialCenter,
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radius: 400,
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draggable: true,
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editable: false,
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});
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// Define a "Crosshair" vector icon
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const parser = new DOMParser();
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const svgString = `<svg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="-6 -6 12 12"><path d="M -6,0 L 6,0 M 0,-6 L 0,6" stroke="black" stroke-width="1"/></svg>`;
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const pinSvg = parser.parseFromString(
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svgString,
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'image/svg+xml'
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).documentElement;
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const centerMarker = new google.maps.marker.AdvancedMarkerElement({
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position: initialCenter,
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title: 'A marker using a custom SVG image.',
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//@ts-ignore
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anchorLeft: '-50%',
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anchorTop: '-50%',
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});
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centerMarker.append(pinSvg);
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mapElement.append(centerMarker);
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// Wait for the map to finish drawing its tiles.
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google.maps.event.addListenerOnce(innerMap, 'tilesloaded', function () {
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// Get the controls div
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const controls = document.getElementById('control-panel');
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// Display controls once map is loaded.
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if (controls) {
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controls.style.display = 'block';
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}
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});
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// Add event listener to update the radius based on user selection.
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buttons.forEach((button) => {
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button.addEventListener('change', (event) => {
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const target = event.target as HTMLInputElement;
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walkingCircle.setRadius(Number(target.value));
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});
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});
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// Handle user click, reset the map center and position the circle.
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innerMap.addListener('click', (mapsMouseEvent) => {
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const newCenter = mapsMouseEvent.latLng;
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walkingCircle.setCenter(newCenter);
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centerMarker.position = newCenter;
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innerMap.panTo(newCenter);
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});
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// Handle user dragging the circle, update the center marker position.
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walkingCircle.addListener('center_changed', () => {
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centerMarker.position = walkingCircle.getCenter();
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});
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}
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initMap();
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// [END maps_circle_simple]

‎samples/circle-simple/package.json‎

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{
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"name": "@js-api-samples/circle-simple",
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"version": "1.0.0",
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"scripts": {
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"build": "tsc && bash ../jsfiddle.sh circle-simple && bash ../app.sh circle-simple && bash ../docs.sh circle-simple && npm run build:vite --workspace=. && bash ../dist.sh circle-simple",
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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/circle-simple/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_circle_simple] */
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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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#control-panel {
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display: none; /* Set to 'display: block' after the map loads. */
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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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font-family: "Roboto", "sans-serif";
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font-size: medium;
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margin: 10px;
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padding: 10px;
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}
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/* [END maps_circle_simple] */

‎samples/circle-simple/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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