Add a Map with Events using HTML

This example demonstrates adding event handling to some gmp-advanced-marker elements, to show an InfoWindow when a marker is clicked.

Read the documentation.

TypeScript

// This example adds a map using web components.
async function init(): Promise<void> {
    void google.maps.importLibrary('marker'); // preload
    const { InfoWindow } = await google.maps.importLibrary('maps');

    console.log('Maps JavaScript API loaded.');

    const advancedMarkers = document.querySelectorAll(
        '#marker-click-event-example gmp-advanced-marker'
    ) as Iterable<google.maps.marker.AdvancedMarkerElement>;

    for (const advancedMarker of advancedMarkers) {
        void customElements.whenDefined(advancedMarker.localName).then(() => {
            advancedMarker.addEventListener('gmp-click', () => {
                const infoWindow = new InfoWindow({
                    content: advancedMarker.title,
                });

                infoWindow.open({
                    anchor: advancedMarker,
                });
            });
        });
    }
}

void init();

JavaScript

// This example adds a map using web components.
async function init() {
    void google.maps.importLibrary('marker'); // preload
    const { InfoWindow } = await google.maps.importLibrary('maps');

    console.log('Maps JavaScript API loaded.');

    const advancedMarkers = document.querySelectorAll(
        '#marker-click-event-example gmp-advanced-marker'
    );

    for (const advancedMarker of advancedMarkers) {
        void customElements.whenDefined(advancedMarker.localName).then(() => {
            advancedMarker.addEventListener('gmp-click', () => {
                const infoWindow = new InfoWindow({
                    content: advancedMarker.title,
                });

                infoWindow.open({
                    anchor: advancedMarker,
                });
            });
        });
    }
}

void init();

CSS

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

HTML

<html>
    <head>
        <title>Add a Map Web Component with 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: "GOOGLE_MAPS_API_KEY"
            });
        </script>
    </head>
    <body>
        <gmp-map
            id="marker-click-event-example"
            center="43.4142989,-124.2301242"
            zoom="4"
            map-id="DEMO_MAP_ID">
            <gmp-advanced-marker
                position="37.4220656,-122.0840897"
                title="Mountain View, CA"
                gmp-clickable></gmp-advanced-marker>
            <gmp-advanced-marker
                position="47.648994,-122.3503845"
                title="Seattle, WA"
                gmp-clickable></gmp-advanced-marker>
        </gmp-map>
    </body>
</html>

Clone Sample

Git and Node.js are required to run this sample locally. Follow these instructions to install Node.js and NPM. You will also need a Google Maps API key.

The following commands clone the repository, install dependencies, and copy the environment file. 

  git clone https://github.com/googlemaps-samples/js-api-samples.git
  cd js-api-samples
  npm i
  cp .env.template .env

Once you copy the environment file, make sure to open the .env file and replace <Insert your own development API key here> with your actual API key before starting the sample. 

  cd samples/web-components-events
  npm start