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Marker Collision Management
AI-generated Key Takeaways
Advanced Markers on vector maps allow you to control how markers behave when they overlap, using
AdvancedMarkerView.collisionBehavior.Three collision behaviors are available:
REQUIRED(always display),OPTIONAL_AND_HIDES_LOWER_PRIORITY(hide if overlapping), andREQUIRED_AND_HIDES_OPTIONAL(always display and hide overlapping optional markers or labels).Collision detection with basemap labels is only supported on vector maps, while raster maps only detect marker-to-marker collisions.
This page provides code samples in TypeScript and JavaScript demonstrating how to implement and manage marker collision behaviors.
Handle marker collisions
Collision behavior controls how a marker will display if it collides (overlaps)with another marker. Collision behavior is only supported when usingAdvanced Markers on a vectormap.
To set collision behavior, setAdvancedMarkerView.collisionBehavior to one ofthe following:
REQUIRED: (default) Always display the marker regardless of collision.OPTIONAL_AND_HIDES_LOWER_PRIORITYDisplay the marker only if it does notoverlap with other markers. If two markers of this type would overlap, the onewith the higherzIndexis shown. If they have the samezIndex, the one withthe lower vertical screen position is shown.REQUIRED_AND_HIDES_OPTIONALAlways display the marker regardless ofcollision, and hide anyOPTIONAL_AND_HIDES_LOWER_PRIORITYmarkers or labelsthat would overlap with the marker.
The following example always displays markers and hides underlying labels:
constadvancedMarker=newgoogle.maps.marker.AdvancedMarkerView({position:newgoogle.maps.LatLng({lat,lng}),map,collisionBehavior:google.maps.CollisionBehavior.REQUIRED_AND_HIDES_OPTIONAL,});The following example hides markers if they collide with a required marker andhides underlying labels:
constadvancedMarker=newgoogle.maps.marker.AdvancedMarkerView({position:newgoogle.maps.LatLng({lat,lng}),map,collisionBehavior:google.maps.CollisionBehavior.OPTIONAL_AND_HIDES_LOWER_PRIORITY,});TypeScript
constmapElement=document.querySelector("gmp-map")asgoogle.maps.MapElement;// 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;// @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}),collisionBehavior:collisionBehavior,});mapElement.appendChild(advancedMarker);markers.push(advancedMarker);});}initMap();
JavaScript
constmapElement=document.querySelector("gmp-map");// 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;// @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}),collisionBehavior:collisionBehavior,});mapElement.appendChild(advancedMarker);markers.push(advancedMarker);});}initMap();
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: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%;}
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> <!-- 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: "AIzaSyA6myHzS10YXdcazAFalmXvDkrYCp5cLc8", v: "weekly"});</script> </head> <body> <div> <gmp-map center="47.609414458375674,-122.33897030353548" zoom="17" map-id="6ff586e93e18149f"></gmp-map> <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> </body></html>Try Sample
Clone Sample
Git and Node.js are required to run this sample locally. Follow theseinstructionsto install Node.js and NPM. The following commands clone, install dependencies and start the sample application.
gitclonehttps://github.com/googlemaps-samples/js-api-samples.gitcdsamples/advanced-markers-collisionnpminpmstart
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Last updated 2025-11-21 UTC.