Control marker collision behavior

The following example shows how to change marker collision behavior.

Read the documentation.

JavaScript

const markers = [];

async function init() {
    // Request needed libraries.
    const { Map3DElement, Marker3DElement } =
        await google.maps.importLibrary('maps3d');

    const map = new Map3DElement({
        center: { lat: 47.6094, lng: -122.339, altitude: 0 },
        range: 1000,
        mode: 'HYBRID',
    });

    for (const [lng, lat] of positions) {
        const marker = new Marker3DElement({
            position: { lat, lng },
            // Try setting a different collision behavior here.
            collisionBehavior: 'REQUIRED',
        });

        markers.push(marker);
        map.append(marker);
    }

    document.body.append(map);
}

const positions = [
    [-122.3402, 47.6093],
    [-122.3402, 47.6094],
    [-122.3403, 47.6094],
    [-122.3384, 47.6098],
    [-122.3389, 47.6095],
    [-122.3396, 47.6095],
    [-122.3379, 47.6097],
    [-122.3378, 47.6097],
    [-122.3396, 47.6091],
    [-122.3383, 47.6089],
    [-122.3379, 47.6093],
    [-122.3381, 47.6095],
    [-122.3378, 47.6095],
];

void init();

const dropdown = document.getElementById('selectElementId');
dropdown.addEventListener('change', drawMap);

function drawMap() {
    for (const marker of markers) {
        marker.collisionBehavior = dropdown.value;
    }
}

CSS

/* 
 * Always set the map height explicitly to define the size of the div element
 * that contains the map. 
 */
html,
map {
    height: 100%;
}
body {
    height: 100%;
    margin: 0;
    padding: 0;
}
selector {
    padding: 2px;
    float: right;
}

HTML

<html>
    <head>
        <title>Map</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>
        <div id="map"></div>

        <selector>
            <select id="selectElementId">
                <option value="">Pick a Collision Behavior</option>
                <option value="REQUIRED">Required</option>
                <option value="REQUIRED_AND_HIDES_OPTIONAL">
                    Required and hides optional
                </option>
                <option value="OPTIONAL_AND_HIDES_LOWER_PRIORITY">
                    Optional and hides lower priority
                </option>
            </select>
        </selector>
    </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/3d-marker-collision-behavior
  npm start