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Set collision behavior for a marker

  • This example demonstrates how to manage marker collisions on a map using theAdvancedMarkerElement andCollisionBehavior properties.

  • Users can interactively select different collision behaviors to control how markers overlap or hide each other.

  • The sample code utilizes the Google Maps JavaScript API with TypeScript and JavaScript examples provided.

  • The code dynamically creates and positions multiple markers on the map, showcasing the impact of the selected collision behavior.

  • A dropdown menu allows users to choose between various collision behaviors, dynamically updating the marker display.

This example shows setting collision behavior for a marker.

Read thedocumentation.

TypeScript

letmap:google.maps.Map;// Initialize and add the mapasyncfunctioninitMap():Promise<void>{// Request needed libraries.const{Map}=awaitgoogle.maps.importLibrary("maps")asgoogle.maps.MapsLibrary;const{AdvancedMarkerElement}=awaitgoogle.maps.importLibrary("marker")asgoogle.maps.MarkerLibrary;letmarkers:google.maps.marker.AdvancedMarkerElement[]=[];letcollisionBehavior=google.maps.CollisionBehavior.REQUIRED;map=newMap(document.getElementById("map")asHTMLElement,{mapId:"6ff586e93e18149f",center:{lat:47.609414458375674,lng:-122.33897030353548},zoom:17,}asgoogle.maps.MapOptions);// @ts-ignoreconstselect=newmdc.select.MDCSelect(document.querySelector(".mdc-select")asHTMLElement);select.listen("MDCSelect:change",()=>{collisionBehavior=select.value;markers.forEach((marker)=>{marker.collisionBehavior=collisionBehavior;});});select.value=collisionBehavior;// Create some markers on the mapletlocations=[[-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[])=>{constadvancedMarker=newAdvancedMarkerElement({position:newgoogle.maps.LatLng({lat,lng}),map,collisionBehavior:collisionBehavior,});markers.push(advancedMarker);});}initMap();
Note: Read theguide on using TypeScript and Google Maps.

JavaScript

letmap;// Initialize and add the mapasyncfunctioninitMap(){// Request needed libraries.const{Map}=awaitgoogle.maps.importLibrary("maps");const{AdvancedMarkerElement}=awaitgoogle.maps.importLibrary("marker");letmarkers=[];letcollisionBehavior=google.maps.CollisionBehavior.REQUIRED;map=newMap(document.getElementById("map"),{mapId:"6ff586e93e18149f",center:{lat:47.609414458375674,lng:-122.33897030353548},zoom:17,});// @ts-ignoreconstselect=newmdc.select.MDCSelect(document.querySelector(".mdc-select"),);select.listen("MDCSelect:change",()=>{collisionBehavior=select.value;markers.forEach((marker)=>{marker.collisionBehavior=collisionBehavior;});});select.value=collisionBehavior;// Create some markers on the mapletlocations=[[-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])=>{constadvancedMarker=newAdvancedMarkerElement({position:newgoogle.maps.LatLng({lat,lng}),map,collisionBehavior:collisionBehavior,});markers.push(advancedMarker);});}initMap();
Note: The JavaScript is compiled from the TypeScript snippet.

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-repeatcenter;}.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:30rem;height:100%;box-sizing:border-box;overflow:auto;}#map{flex-basis:0;flex-grow:4;height:100%;}.mdc-select,.mdc-select__anchor,.mdc-select__menu{width:100%;}

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>  </head>  <body>    <div>      <div></div>      <div>        <div>          <div                       aria-labelledby="outlined-select-label"          >            <input              type="text"              disabled              readonly                                      />            <i></i>            <span>              <span></span>              <span>                <span                                                    >Pick a Collision Behavior</span                >              </span>              <span></span>            </span>          </div>          <div>            <ul>              <li data-value="REQUIRED">Required</li>              <li                               data-value="REQUIRED_AND_HIDES_OPTIONAL"              >                Required and hides optional              </li>              <li                               data-value="OPTIONAL_AND_HIDES_LOWER_PRIORITY"              >                Optional and hides lower priority              </li>            </ul>          </div>        </div>      </div>    </div>    <!-- prettier-ignore -->    <script>(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: "AIzaSyB41DRUbKWJHPxaFjMAwdrzWzbVKartNGg", v: "weekly"});</script>  </body></html>

Try Sample

Clone Sample

Git and Node.js are required to run this sample locally. Follow theseinstructions to install Node.js and NPM. The following commands clone, install dependencies and start the sample application.

gitclone-bsample-advanced-markers-collisionhttps://github.com/googlemaps/js-samples.gitcdjs-samplesnpminpmstart

Other samples can be tried by switching to any branch beginning withsample-SAMPLE_NAME.

gitcheckoutsample-SAMPLE_NAMEnpminpmstart

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Last updated 2025-11-21 UTC.