Simple Click Events

  • This example showcases the implementation of event listeners in Google Maps using JavaScript or TypeScript.

  • Clicking the marker on the map triggers a zoom-in and centers the map on the marker's location.

  • The map automatically pans back to the marker's position 3 seconds after the center of the map is changed.

  • Code samples in JavaScript, TypeScript, HTML, and CSS are provided, alongside links to documentation and live demos.

This example demonstrates the use of event listeners. It

  • listens for the click event on a marker to zoom the map when the marker is clicked.
  • listens for the center_changed event to pan the map back to the marker after 3 seconds.

Read the documentation.

TypeScript

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

    // Retrieve the map element.
    const mapElement = document.querySelector('gmp-map')!;

    // Get the inner map from the map element.
    const innerMap = mapElement.innerMap;

    const originalPosition = new LatLng(mapElement.center!);

    const marker = new AdvancedMarkerElement({
        position: originalPosition,
        map: innerMap,
        title: 'Click to zoom',
        gmpClickable: true,
    });

    innerMap.addListener('center_changed', () => {
        // 3 seconds after the center of the map has changed,
        // pan back to the marker.
        window.setTimeout(() => {
            innerMap.panTo(originalPosition);
        }, 3000);
    });

    // Zoom in when the marker is clicked.
    marker.addEventListener('gmp-click', () => {
        innerMap.setZoom(8);
        innerMap.setCenter(originalPosition);
    });
}

void init();

JavaScript

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

    // Retrieve the map element.
    const mapElement = document.querySelector('gmp-map');

    // Get the inner map from the map element.
    const innerMap = mapElement.innerMap;

    const originalPosition = new LatLng(mapElement.center);

    const marker = new AdvancedMarkerElement({
        position: originalPosition,
        map: innerMap,
        title: 'Click to zoom',
        gmpClickable: true,
    });

    innerMap.addListener('center_changed', () => {
        // 3 seconds after the center of the map has changed,
        // pan back to the marker.
        window.setTimeout(() => {
            innerMap.panTo(originalPosition);
        }, 3000);
    });

    // Zoom in when the marker is clicked.
    marker.addEventListener('gmp-click', () => {
        innerMap.setZoom(8);
        innerMap.setCenter(originalPosition);
    });
}

void init();

CSS

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

HTML

<html>
    <head>
        <title>Simple Click 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
            center="-25.363, 131.044"
            zoom="4"
            map-id="DEMO_MAP_ID"></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/event-simple
  npm start