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containsLocation()

  • This example demonstrates how to determine if a clicked point is inside or outside a specified polygon using the Google Maps JavaScript API.

  • Clicks inside the polygon (Bermuda Triangle) draw a blue triangle, while clicks outside draw a red circle.

  • Thegoogle.maps.geometry.poly.containsLocation function is key to achieving this functionality.

  • The sample code provides implementations in both JavaScript and TypeScript.

  • You can interact with a live demo of the code via JSFiddle or Google Cloud Shell.

This example draws a red circle when the clicked point falls outside of thespecified polygon (the Bermuda Triangle), and a blue triangle when the clickfalls inside the polygon.

Read thedocumentation.

TypeScript

// This example requires the Geometry library. Include the libraries=geometry// parameter when you first load the API. For example:// <script src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&libraries=geometry">functioninitMap():void{constmap=newgoogle.maps.Map(document.getElementById("map")asHTMLElement,{center:{lat:24.886,lng:-70.269},zoom:5,});consttriangleCoords=[{lat:25.774,lng:-80.19},{lat:18.466,lng:-66.118},{lat:32.321,lng:-64.757},];constbermudaTriangle=newgoogle.maps.Polygon({paths:triangleCoords});google.maps.event.addListener(map,"click",(e)=>{constresultColor=google.maps.geometry.poly.containsLocation(e.latLng,bermudaTriangle)?"blue":"red";constresultPath=google.maps.geometry.poly.containsLocation(e.latLng,bermudaTriangle)?// A triangle."m 0 -1 l 1 2 -2 0 z":google.maps.SymbolPath.CIRCLE;newgoogle.maps.Marker({position:e.latLng,map,icon:{path:resultPath,fillColor:resultColor,fillOpacity:0.2,strokeColor:"white",strokeWeight:0.5,scale:10,},});});}declareglobal{interfaceWindow{initMap:()=>void;}}window.initMap=initMap;
Note: Read theguide on using TypeScript and Google Maps.

JavaScript

// This example requires the Geometry library. Include the libraries=geometry// parameter when you first load the API. For example:// <script src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&libraries=geometry">functioninitMap(){constmap=newgoogle.maps.Map(document.getElementById("map"),{center:{lat:24.886,lng:-70.269},zoom:5,});consttriangleCoords=[{lat:25.774,lng:-80.19},{lat:18.466,lng:-66.118},{lat:32.321,lng:-64.757},];constbermudaTriangle=newgoogle.maps.Polygon({paths:triangleCoords});google.maps.event.addListener(map,"click",(e)=>{constresultColor=google.maps.geometry.poly.containsLocation(e.latLng,bermudaTriangle,)?"blue":"red";constresultPath=google.maps.geometry.poly.containsLocation(e.latLng,bermudaTriangle,)?// A triangle."m 0 -1 l 1 2 -2 0 z":google.maps.SymbolPath.CIRCLE;newgoogle.maps.Marker({position:e.latLng,map,icon:{path:resultPath,fillColor:resultColor,fillOpacity:0.2,strokeColor:"white",strokeWeight:0.5,scale:10,},});});}window.initMap=initMap;
Note: The JavaScript is compiled from the TypeScript snippet.

CSS

/* * Always set the map height explicitly to define the size of the div element * that contains the map. */#map{height:100%;}/* * Optional: Makes the sample page fill the window. */html,body{height:100%;margin:0;padding:0;}

HTML

<html>  <head>    <title>Polygon Contains Location</title>    <link rel="stylesheet" type="text/css" href="./style.css" />    <script type="module" src="./index.js"></script>  </head>  <body>    <div></div>    <!--       The `defer` attribute causes the script to execute after the full HTML      document has been parsed. For non-blocking uses, avoiding race conditions,      and consistent behavior across browsers, consider loading using Promises. See      https://developers.google.com/maps/documentation/javascript/load-maps-js-api      for more information.      -->    <script      src="https://maps.googleapis.com/maps/api/js?key=AIzaSyB41DRUbKWJHPxaFjMAwdrzWzbVKartNGg&callback=initMap&libraries=geometry&v=weekly"      defer    ></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-poly-containsLocationhttps://github.com/googlemaps/js-samples.gitcdjs-samplesnpminpmstart

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

gitcheckoutsample-SAMPLE_NAMEnpminpmstart

Except as otherwise noted, the content of this page is licensed under theCreative Commons Attribution 4.0 License, and code samples are licensed under theApache 2.0 License. For details, see theGoogle Developers Site Policies. Java is a registered trademark of Oracle and/or its affiliates.

Last updated 2025-12-11 UTC.