place-autocomplete-data-session

Sample code supporting Google Maps Platform JavaScript API documentation. author(s): Geo Developer IX Documentation Team

HTML

<!doctype html>
<!--
 @license
 Copyright 2025 Google LLC. All Rights Reserved.
 SPDX-License-Identifier: Apache-2.0
-->

<html>
  <head>
    <title>Place Autocomplete Data API Session</title>

    <script>
      // prettier-ignore
      (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))})({
            });
    </script>
  </head>
  <body>
    <gmp-map center="37.7893, -122.4039" zoom="12" map-id="DEMO_MAP_ID">
      <div class="controls" slot="control-inline-start-block-start">
        <input
          type="text"
          class="input"
          placeholder="Search for a place..."
          autocomplete="off" /><!-- Turn off the input's own autocomplete (not supported by all browsers).-->
        <div class="token-status"></div>
        <div class="title"></div>
        <ol class="results"></ol>
      </div>
    </gmp-map>
  </body>
</html>

CSS

/**
 * @license
 * Copyright 2025 Google LLC. All Rights Reserved.
 * SPDX-License-Identifier: Apache-2.0
 */

/* 
 * Always set the map height explicitly to define the size of the div element
 * that contains the map. 
 */
gmp-map {
  height: 100%;
}

/* 
 * Optional: Makes the sample page fill the window. 
 */
html,
body {
  height: 100%;
  margin: 0;
  padding: 0;
}

.place-button {
  height: 3rem;
  width: 100%;
  background-color: transparent;
  text-align: left;
  border: none;
  cursor: pointer;
}

.place-button:focus-visible {
  outline: 2px solid #0056b3;
  border-radius: 2px;
}

.input {
  width: 300px;
  font-size: small;
  margin-bottom: 1rem;
}

/* Styles for the floating panel */
.controls {
  background-color: #fff;
  border-radius: 8px;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.3);
  font-family: sans-serif;
  font-size: small;
  margin: 12px;
  padding: 1rem;
}

.title {
  font-weight: bold;
  margin-top: 1rem;
  margin-bottom: 0.5rem;
}

.results {
  list-style-type: none;
  margin: 0;
  padding: 0;
}

.results li:not(:last-child) {
  border-bottom: 1px solid #ddd;
}

.results li:hover {
  background-color: #eee;
}

JavaScript

'use strict';
/**
 * @license
 * Copyright 2025 Google LLC. All Rights Reserved.
 * SPDX-License-Identifier: Apache-2.0
 */

const mapElement = document.querySelector('gmp-map');
let innerMap;
let marker;
const titleElement = document.querySelector('.title');
const resultsContainerElement = document.querySelector('.results');
const inputElement = document.querySelector('input');
const tokenStatusElement = document.querySelector('.token-status');
let newestRequestId = 0;
let tokenCount = 0;

// Create an initial request body.
const request = {
  input: '',
  includedPrimaryTypes: [
    'restaurant',
    'cafe',
    'museum',
    'park',
    'botanical_garden',
  ],
};

async function init() {
  await google.maps.importLibrary('maps');
  innerMap = mapElement.innerMap;
  innerMap.setOptions({
    mapTypeControl: false,
  });

  // Update request center and bounds when the map bounds change.
  innerMap.addListener('bounds_changed', () => {
    request.locationRestriction = innerMap.getBounds();
    request.origin = innerMap.getCenter();
  });

  inputElement.addEventListener('input', makeAutocompleteRequest);
}

async function makeAutocompleteRequest(inputEvent) {
  // To avoid race conditions, store the request ID and compare after the request.
  const requestId = ++newestRequestId;

  const { AutocompleteSuggestion } = await google.maps.importLibrary('places');

  if (!inputEvent.target?.value) {
    titleElement.textContent = '';
    resultsContainerElement.replaceChildren();
    return;
  }

  // Add the latest char sequence to the request.
  request.input = inputEvent.target.value;

  // Fetch autocomplete suggestions and show them in a list.
  const { suggestions } =
    await AutocompleteSuggestion.fetchAutocompleteSuggestions(request);

  // If the request has been superseded by a newer request, do not render the output.
  if (requestId !== newestRequestId) return;

  titleElement.innerText = `Place predictions for "${request.input}"`;

  // Clear the list...