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Accessing Arguments in UI Events

Page Summary

This example demonstrates how to create a clickable map that places a marker at the clicked location.
When a user clicks on the map, a marker is added and the map view is centered on that point.
It utilizes the Google Maps JavaScript API's event listeners to handle user interactions.
The sample code is provided in both TypeScript and JavaScript for flexibility.
The HTML, CSS and Javascript code are provided to facilitate implementing this feature on a webpage.

This example creates a map that the user can click to create a marker at the clicked point.

Read the documentation .

TypeScript

 async 
  
 function 
  
 initMap 
 () 
  
 { 
  
 // Request needed libraries. 
  
 await 
  
 google 
 . 
 maps 
 . 
 importLibrary 
 ( 
 "maps" 
 ) 
  
 as 
  
 google 
 . 
 maps 
 . 
 MapsLibrary 
 ; 
  
 await 
  
 google 
 . 
 maps 
 . 
 importLibrary 
 ( 
 "marker" 
 ) 
  
 as 
  
 google 
 . 
 maps 
 . 
 MarkerLibrary 
 ; 
  
 const 
  
 mapElement 
  
 = 
  
 document 
 . 
 querySelector 
 ( 
 'gmp-map' 
 ) 
  
 as 
  
 google 
 . 
 maps 
 . 
 MapElement 
 ; 
  
 const 
  
 innerMap 
  
 = 
  
 mapElement 
 . 
 innerMap 
 ; 
  
 innerMap 
 . 
 addListener 
 ( 
 "click" 
 , 
  
 ( 
 e 
 ) 
  
 = 
>  
 { 
  
 placeMarkerAndPanTo 
 ( 
 e 
 . 
 latLng 
 , 
  
 innerMap 
 ); 
  
 }); 
 } 
 function 
  
 placeMarkerAndPanTo 
 ( 
 latLng 
 : 
  
 google.maps.LatLng 
 , 
  
 map 
 : 
  
 google.maps.Map 
 ) 
  
 { 
  
 new 
  
 google 
 . 
 maps 
 . 
 marker 
 . 
 AdvancedMarkerElement 
 ({ 
  
 position 
 : 
  
 latLng 
 , 
  
 map 
 : 
  
 map 
 , 
  
 }); 
  
 map 
 . 
 panTo 
 ( 
 latLng 
 ); 
 } 
 initMap 
 (); 
   index 
 . 
 ts

JavaScript

 async 
  
 function 
  
 initMap 
 () 
  
 { 
  
 // Request needed libraries. 
  
 await 
  
 google 
 . 
 maps 
 . 
 importLibrary 
 ( 
 "maps" 
 ); 
  
 await 
  
 google 
 . 
 maps 
 . 
 importLibrary 
 ( 
 "marker" 
 ); 
  
 const 
  
 mapElement 
  
 = 
  
 document 
 . 
 querySelector 
 ( 
 'gmp-map' 
 ); 
  
 const 
  
 innerMap 
  
 = 
  
 mapElement 
 . 
 innerMap 
 ; 
  
 innerMap 
 . 
 addListener 
 ( 
 "click" 
 , 
  
 ( 
 e 
 ) 
  
 = 
>  
 { 
  
 placeMarkerAndPanTo 
 ( 
 e 
 . 
 latLng 
 , 
  
 innerMap 
 ); 
  
 }); 
 } 
 function 
  
 placeMarkerAndPanTo 
 ( 
 latLng 
 , 
  
 map 
 ) 
  
 { 
  
 new 
  
 google 
 . 
 maps 
 . 
 marker 
 . 
 AdvancedMarkerElement 
 ({ 
  
 position 
 : 
  
 latLng 
 , 
  
 map 
 : 
  
 map 
 , 
  
 }); 
  
 map 
 . 
 panTo 
 ( 
 latLng 
 ); 
 } 
 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>Accessing Arguments in UI Events</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="-25.363882,131.044922" zoom="4" map-id="DEMO_MAP_ID"></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 
 - 
 arguments 
 
  
  npm 
  
 i 
 
  
  npm 
  
 start