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Polygon Arrays

  • This example demonstrates creating and displaying a polygon on a map using the Google Maps JavaScript API.

  • The polygon is interactive, displaying an info window with coordinate details upon clicking.

  • The code provides examples in both JavaScript and TypeScript, showcasing how to define polygon properties and handle events.

  • Users can interact with a live demo of the map via provided links to JSFiddle and Google Cloud Shell.

  • The sample code can be cloned and run locally using Git and Node.js for further exploration and customization.

This example creates a map with a simple polygon which displays information inresponse to a click event.

Read thedocumentation.

TypeScript

// This example creates a simple polygon representing the Bermuda Triangle.// When the user clicks on the polygon an info window opens, showing// information about the polygon's coordinates.letmap:google.maps.Map;letinfoWindow:google.maps.InfoWindow;functioninitMap():void{map=newgoogle.maps.Map(document.getElementById("map")asHTMLElement,{zoom:5,center:{lat:24.886,lng:-70.268},mapTypeId:"terrain",});// Define the LatLng coordinates for the polygon.consttriangleCoords:google.maps.LatLngLiteral[]=[{lat:25.774,lng:-80.19},{lat:18.466,lng:-66.118},{lat:32.321,lng:-64.757},];// Construct the polygon.constbermudaTriangle=newgoogle.maps.Polygon({paths:triangleCoords,strokeColor:"#FF0000",strokeOpacity:0.8,strokeWeight:3,fillColor:"#FF0000",fillOpacity:0.35,});bermudaTriangle.setMap(map);// Add a listener for the click event.bermudaTriangle.addListener("click",showArrays);infoWindow=newgoogle.maps.InfoWindow();}functionshowArrays(event:any){// Since this polygon has only one path, we can call getPath() to return the// MVCArray of LatLngs.// @ts-ignoreconstpolygon=thisasgoogle.maps.Polygon;constvertices=polygon.getPath();letcontentString="<b>Bermuda Triangle polygon</b><br>"+"Clicked location: <br>"+event.latLng.lat()+","+event.latLng.lng()+"<br>";// Iterate over the vertices.for(leti=0;i <vertices.getLength();i++){constxy=vertices.getAt(i);contentString+="<br>"+"Coordinate "+i+":<br>"+xy.lat()+","+xy.lng();}// Replace the info window's content and position.infoWindow.setContent(contentString);infoWindow.setPosition(event.latLng);infoWindow.open(map);}declareglobal{interfaceWindow{initMap:()=>void;}}window.initMap=initMap;
Note: Read theguide on using TypeScript and Google Maps.

JavaScript

// This example creates a simple polygon representing the Bermuda Triangle.// When the user clicks on the polygon an info window opens, showing// information about the polygon's coordinates.letmap;letinfoWindow;functioninitMap(){map=newgoogle.maps.Map(document.getElementById("map"),{zoom:5,center:{lat:24.886,lng:-70.268},mapTypeId:"terrain",});// Define the LatLng coordinates for the polygon.consttriangleCoords=[{lat:25.774,lng:-80.19},{lat:18.466,lng:-66.118},{lat:32.321,lng:-64.757},];// Construct the polygon.constbermudaTriangle=newgoogle.maps.Polygon({paths:triangleCoords,strokeColor:"#FF0000",strokeOpacity:0.8,strokeWeight:3,fillColor:"#FF0000",fillOpacity:0.35,});bermudaTriangle.setMap(map);// Add a listener for the click event.bermudaTriangle.addListener("click",showArrays);infoWindow=newgoogle.maps.InfoWindow();}functionshowArrays(event){// Since this polygon has only one path, we can call getPath() to return the// MVCArray of LatLngs.// @ts-ignoreconstpolygon=this;constvertices=polygon.getPath();letcontentString="<b>Bermuda Triangle polygon</b><br>"+"Clicked location: <br>"+event.latLng.lat()+","+event.latLng.lng()+"<br>";// Iterate over the vertices.for(leti=0;i <vertices.getLength();i++){constxy=vertices.getAt(i);contentString+="<br>"+"Coordinate "+i+":<br>"+xy.lat()+","+xy.lng();}// Replace the info window's content and position.infoWindow.setContent(contentString);infoWindow.setPosition(event.latLng);infoWindow.open(map);}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 Arrays</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&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-polygon-arrayshttps://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 2025-11-21 UTC.