Accessing Arguments in UI Events

  • 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.
    const [, { AdvancedMarkerElement }] = await Promise.all([
        google.maps.importLibrary('maps'),
        google.maps.importLibrary('marker'),
    ]);

    const mapElement = document.querySelector('gmp-map')!;
    const innerMap = mapElement.innerMap;

    innerMap.addListener('click', (e) => {
        new AdvancedMarkerElement({
            position: e.latLng,
            map: innerMap,
        });
        innerMap.panTo(e.latLng);
    });
}

void initMap();

JavaScript

async function initMap() {
    // Request needed libraries.
    const [, { AdvancedMarkerElement }] = await Promise.all([
        google.maps.importLibrary('maps'),
        google.maps.importLibrary('marker'),
    ]);

    const mapElement = document.querySelector('gmp-map');
    const innerMap = mapElement.innerMap;

    innerMap.addListener('click', (e) => {
        new AdvancedMarkerElement({
            position: e.latLng,
            map: innerMap,
        });
        innerMap.panTo(e.latLng);
    });
}

void initMap();

CSS

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

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>
        <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: "AIzaSyA6myHzS10YXdcazAFalmXvDkrYCp5cLc8"
            });
        </script>
    </head>
    <body>
        <gmp-map
            center="-25.363882,131.044922"
            zoom="4"
            map-id="DEMO_MAP_ID"></gmp-map>
    </body>
</html>

Try Sample

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