Set collision behavior for a marker

This example shows setting collision behavior for a marker.

Read the documentation.

TypeScript

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

// Initialize and add the map
async function initMap(): Promise<void> {
    // Request needed libraries.
    const [, { AdvancedMarkerElement }] = await Promise.all([
        google.maps.importLibrary('maps'),
        google.maps.importLibrary('marker'),
    ]);

    const markers: google.maps.marker.AdvancedMarkerElement[] = [];

    const collisionBehavior: google.maps.CollisionBehaviorString = 'REQUIRED';

    // @ts-expect-error: mdc not typed
    const select = new mdc.select.MDCSelect(
        document.querySelector('.mdc-select')
    );

    select.listen('MDCSelect:change', () => {
        markers.forEach((marker) => {
            marker.collisionBehavior =
                select.value as google.maps.CollisionBehavior;
        });
    });

    select.value = collisionBehavior;

    // Create some markers on the map
    const locations = [
        [-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],
    ];

    locations.forEach(([lng, lat]: number[]) => {
        const advancedMarker = new AdvancedMarkerElement({
            position: { lat, lng },
            collisionBehavior,
        });
        mapElement.appendChild(advancedMarker);
        markers.push(advancedMarker);
    });
}

void initMap();
index.ts

Note: Read the guide on using TypeScript and Google Maps.

JavaScript

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

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

    const markers = [];

    const collisionBehavior = 'REQUIRED';

    // @ts-expect-error: mdc not typed
    const select = new mdc.select.MDCSelect(
        document.querySelector('.mdc-select')
    );

    select.listen('MDCSelect:change', () => {
        markers.forEach((marker) => {
            marker.collisionBehavior = select.value;
        });
    });

    select.value = collisionBehavior;

    // Create some markers on the map
    const locations = [
        [-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],
    ];

    locations.forEach(([lng, lat]) => {
        const advancedMarker = new AdvancedMarkerElement({
            position: { lat, lng },
            collisionBehavior,
        });
        mapElement.appendChild(advancedMarker);
        markers.push(advancedMarker);
    });
}

void initMap();
index.js

CSS

:root {
    --mdc-theme-primary: #1a73e8;
    --mdc-theme-secondary: #rgb(225, 245, 254);
    --mdc-theme-on-primary: #fff;
    --mdc-theme-on-secondary: rgb(1, 87, 155);
}

.mdc-text-field--focused:not(.mdc-text-field--disabled) .mdc-floating-label {
    color: var(--mdc-theme-primary);
}

.mdc-select--focused .mdc-select__dropdown-icon {
    background: url(data:image/svg+xml,%3Csvg%20width%3D%2210px%22%20height%3D%225px%22%20viewBox%3D%227%2010%2010%205%22%20version%3D%221.1%22%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20xmlns%3Axlink%3D%22http%3A%2F%2Fwww.w3.org%2F1999%2Fxlink%22%3E%0A%20%20%20%20%3Cpolygon%20id%3D%22Shape%22%20stroke%3D%22none%22%20fill%3D%22%23000%22%20fill-rule%3D%22evenodd%22%20opacity%3D%220.54%22%20points%3D%227%2010%2012%2015%2017%2010%22%3E%3C%2Fpolygon%3E%0A%3C%2Fsvg%3E)
        no-repeat center;
}

.mdc-select:not(.mdc-select--disabled).mdc-select--focused .mdc-floating-label {
    color: var(--mdc-theme-primary);
}

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

#container {
    height: 100%;
    display: flex;
}

#sidebar {
    flex-basis: 15rem;
    flex-grow: 1;
    padding: 1rem;
    max-width: 33rem;
    height: 100%;
    box-sizing: border-box;
    overflow: auto;
}

gmp-map {
    flex-basis: 0;
    flex-grow: 4;
    height: 100%;
}

.mdc-select,
.mdc-select__anchor,
.mdc-select__menu {
    width: 100%;
}
style.css

HTML

<html>
    <head>
        <title>Advanced Marker Collision Management</title>

        <link
            href="https://unpkg.com/material-components-web@6.0.0/dist/material-components-web.css"
            rel="stylesheet" />
        <script src="https://unpkg.com/material-components-web@6.0.0/dist/material-components-web.min.js"></script>
        <link
            rel="stylesheet"
            href="https://fonts.googleapis.com/icon?family=Material+Icons" />

        <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>
        <div id="container">
            <gmp-map
                center="47.609414458375674,-122.33897030353548"
                zoom="17"
                map-id="6ff586e93e18149f"></gmp-map>
            <div id="sidebar">
                <div class="mdc-select mdc-select--outlined">
                    <div
                        class="mdc-select__anchor"
                        aria-labelledby="outlined-select-label">
                        <input
                            type="text"
                            disabled
                            readonly
                            id="demo-selected-text"
                            class="mdc-select__selected-text" />
                        <i class="mdc-select__dropdown-icon"></i>
                        <span class="mdc-notched-outline">
                            <span class="mdc-notched-outline__leading"></span>
                            <span class="mdc-notched-outline__notch">
                                <span
                                    id="outlined-select-label"
                                    class="mdc-floating-label mdc-theme--primary"
                                    >Pick a Collision Behavior</span
                                >
                            </span>
                            <span class="mdc-notched-outline__trailing"></span>
                        </span>
                    </div>
                    <div class="mdc-select__menu mdc-menu mdc-menu-surface">
                        <ul class="mdc-list">
                            <li class="mdc-list-item" data-value="REQUIRED">
                                Required
                            </li>
                            <li
                                class="mdc-list-item"
                                data-value="REQUIRED_AND_HIDES_OPTIONAL">
                                Required and hides optional
                            </li>
                            <li
                                class="mdc-list-item"
                                data-value="OPTIONAL_AND_HIDES_LOWER_PRIORITY">
                                Optional and hides lower priority
                            </li>
                        </ul>
                    </div>
                </div>
            </div>
        </div>
    </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/advanced-markers-collision
  npm i
  npm start