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Getting Lat/Lng from a Click Event

This example listens for the click event, gets the latitude and longitude coordinates of the click from google.maps.MapMouseEvent.latLng, and displays those coordinates in an info window.

Read the documentation.

TypeScript

async function initMap() {
  // Request needed libraries.
  await google.maps.importLibrary("maps") as google.maps.MapsLibrary;

  // Set up the map.
  const mapElement = document.querySelector('gmp-map') as google.maps.MapElement;
  const innerMap = mapElement.innerMap;

  // Get the initial center of the map.
  const position = innerMap.getCenter() as google.maps.LatLng;

  // Create the initial InfoWindow.
  let infoWindow = new google.maps.InfoWindow({
    content: "Click the map to get Lat/Lng!",
    position,
  });

  infoWindow.open(innerMap);

  // Configure the click listener.
  innerMap.addListener("click", (mapsMouseEvent) => {
    // Close the current InfoWindow.
    infoWindow.close();

    // Create a new InfoWindow.
    infoWindow = new google.maps.InfoWindow({
      position: mapsMouseEvent.latLng,
    });
    infoWindow.setContent(
      JSON.stringify(mapsMouseEvent.latLng.toJSON(), null, 2)
    );
    infoWindow.open(innerMap);
  });
}

initMap();index.ts

JavaScript

async function initMap() {
    // Request needed libraries.
    await google.maps.importLibrary("maps");
    // Set up the map.
    const mapElement = document.querySelector('gmp-map');
    const innerMap = mapElement.innerMap;
    // Get the initial center of the map.
    const position = innerMap.getCenter();
    // Create the initial InfoWindow.
    let infoWindow = new google.maps.InfoWindow({
        content: "Click the map to get Lat/Lng!",
        position,
    });
    infoWindow.open(innerMap);
    // Configure the click listener.
    innerMap.addListener("click", (mapsMouseEvent) => {
        // Close the current InfoWindow.
        infoWindow.close();
        // Create a new InfoWindow.
        infoWindow = new google.maps.InfoWindow({
            position: mapsMouseEvent.latLng,
        });
        infoWindow.setContent(JSON.stringify(mapsMouseEvent.latLng.toJSON(), null, 2));
        infoWindow.open(innerMap);
    });
}
initMap();index.js

CSS

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

HTML

<html>
  <head>
    <title>Event Click LatLng</title>

    <link rel="stylesheet" type="text/css" href="./style.css" />
    <script type="module" src="./index.js"></script>
    <!-- prettier-ignore -->
    <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))})
        ({key: "AIzaSyA6myHzS10YXdcazAFalmXvDkrYCp5cLc8", v: "weekly"});</script>
  </head>
  <body>
    <gmp-map center="-25.363,131.044" zoom="4"></gmp-map>
  </body>
</html>index.html

Try Sample

JSFiddle.net

Clone Sample

Git and Node.js are required to run this sample locally. Follow these instructions to install Node.js and NPM. The following commands clone, install dependencies and start the sample application.

  git clone https://github.com/googlemaps-samples/js-api-samples.git
  cd samples/event-click-latlng
  npm i
  npm start