index.js

"use strict";
/**
 * @license
 * Copyright 2026 Google LLC. All Rights Reserved.
 * SPDX-License-Identifier: Apache-2.0
 */
// [START maps_geocoding_reverse]
let marker;
async function initMap() {
    //  Request the needed libraries.
    const [{ Map, InfoWindow }, { Geocoder }, { AdvancedMarkerElement }] = await Promise.all([
        google.maps.importLibrary('maps'),
        google.maps.importLibrary('geocoding'),
        google.maps.importLibrary('marker'),
    ]);
    // Get the gmp-map element.
    const mapElement = document.querySelector('gmp-map');
    // Get the inner map.
    const innerMap = mapElement.innerMap;
    // Get the latlng input box.
    const latLngQuery = document.getElementById('latlng');
    // Get the submit button.
    const submitButton = document.getElementById('submit');
    // Set the cursor to crosshair.
    innerMap.setOptions({
        draggableCursor: 'crosshair',
        zoom: 13,
        mapTypeControl: false,
    });
    // Create a marker for re-use.
    marker = new AdvancedMarkerElement({
        map: innerMap,
    });
    marker.anchorTop = "40px";
    const geocoder = new Geocoder();
    const infowindow = new InfoWindow();
    // Add a click event listener to the submit button.
    submitButton.addEventListener('click', () => {
        geocodeLatLng(geocoder, innerMap, infowindow);
    });
    // Add a click event listener to the map.
    innerMap.addListener('click', (event) => {
        latLngQuery.value = `${event.latLng.lat()}, ${event.latLng.lng()}`;
        geocodeLatLng(geocoder, innerMap, infowindow);
    });
    // Make an initial request upon loading.
    geocodeLatLng(geocoder, innerMap, infowindow);
}
async function geocodeLatLng(geocoder, map, infowindow) {
    const input = document.getElementById('latlng').value;
    const latlngStr = input.split(',', 2);
    const latlng = {
        lat: parseFloat(latlngStr[0]),
        lng: parseFloat(latlngStr[1]),
    };
    geocoder
        .geocode({ location: latlng })
        .then((response) => {
        if (response.results[0]) {
            marker.position = latlng;
            map.setCenter(latlng);
            infowindow.setContent(response.results[0].formatted_address);
            infowindow.open(map, marker);
        }
        else {
            window.alert('No results found');
        }
    })
        .catch((e) => window.alert('Geocoder failed due to: ' + e));
}
initMap();
// [END maps_geocoding_reverse]