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Getting Lat/Lng from a Click Event

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Page Summary

This example demonstrates capturing the latitude and longitude coordinates of a user's click on a Google Map.
It uses an InfoWindow to display the coordinates on the map at the clicked location.
The example code is provided in both TypeScript and JavaScript, along with HTML and CSS for creating the map display.
Users can try the sample directly in JSFiddle or Google Cloud Shell, and can also clone the sample code to run it locally.

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.

[フレーム]

TypeScript

asyncfunctioninit(){
// Request needed libraries.
const{InfoWindow}=awaitgoogle.maps.importLibrary('maps');
// Set up the map.
constmapElement=document.querySelector('gmp-map')!;
constinnerMap=mapElement.innerMap;
// Get the initial center of the map.
constposition=innerMap.getCenter();
// Create the initial InfoWindow.
letinfoWindow=newInfoWindow({
content:'Click the map to get Lat/Lng!',
position,
});
infoWindow.open(innerMap);
// Configure the click listener.
innerMap.addListener(
'click',
(mapsMouseEvent:google.maps.MapMouseEvent)=>{
// Close the current InfoWindow.
infoWindow.close();
// Create a new InfoWindow.
infoWindow=newInfoWindow({
position:mapsMouseEvent.latLng,
});
infoWindow.setContent(
JSON.stringify(mapsMouseEvent.latLng!.toJSON(),null,2)
);
infoWindow.open(innerMap);
}
);
}
voidinit();index.ts

JavaScript

asyncfunctioninit(){
// Request needed libraries.
const{InfoWindow}=awaitgoogle.maps.importLibrary('maps');
// Set up the map.
constmapElement=document.querySelector('gmp-map');
constinnerMap=mapElement.innerMap;
// Get the initial center of the map.
constposition=innerMap.getCenter();
// Create the initial InfoWindow.
letinfoWindow=newInfoWindow({
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=newInfoWindow({
position:mapsMouseEvent.latLng,
});
infoWindow.setContent(
JSON.stringify(mapsMouseEvent.latLng.toJSON(),null,2)
);
infoWindow.open(innerMap);
});
}
voidinit();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>
 <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))})({
 key: "GOOGLE_MAPS_API_KEY"
 });
 </script>
 </head>
 <body>
 <gmp-map center="-25.363,131.044" zoom="4"></gmp-map>
 </body>
</html>index.html

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.

gitclonehttps://github.com/googlemaps-samples/js-api-samples.git
cdsamples/event-click-latlng
npmi
npmstart