Style a boundary polygon
Page Summary
This example highlights the boundary polygon of a single region on a map using the Maps JavaScript API.
It utilizes the
FeatureLayerto style the boundary with a purple fill and border for a specific place ID (Hana, HI).The sample code is provided in TypeScript and JavaScript, allowing developers to choose their preferred language.
Users can explore the sample through JSFiddle, Google Cloud Shell, or by cloning the repository and running it locally.
This example map demonstrates highlighting the boundary polygon for a singleregion.
Read thedocumentation.
TypeScript
letfeatureLayer;asyncfunctioninitMap(){// Request needed libraries.(awaitgoogle.maps.importLibrary('maps'))asgoogle.maps.MapsLibrary;// Get the gmp-map element.constmapElement=document.querySelector('gmp-map')asgoogle.maps.MapElement;// Get the inner map.constinnerMap=mapElement.innerMap;// Get the feature layer.featureLayer=innerMap.getFeatureLayer(google.maps.FeatureType.LOCALITY);// Define a style with purple fill and border.constfeatureStyleOptions:google.maps.FeatureStyleOptions={strokeColor:'#810FCB',strokeOpacity:1.0,strokeWeight:3.0,fillColor:'#810FCB',fillOpacity:0.5,};// Apply the style to a single boundary.featureLayer.style=(options:{feature:{placeId:string}})=>{if(options.feature.placeId=='ChIJ0zQtYiWsVHkRk8lRoB1RNPo'){// Hana, HIreturnfeatureStyleOptions;}};}initMap();
JavaScript
letfeatureLayer;asyncfunctioninitMap(){// Request needed libraries.(awaitgoogle.maps.importLibrary('maps'));// Get the gmp-map element.constmapElement=document.querySelector('gmp-map');// Get the inner map.constinnerMap=mapElement.innerMap;// Get the feature layer.featureLayer=innerMap.getFeatureLayer(google.maps.FeatureType.LOCALITY);// Define a style with purple fill and border.constfeatureStyleOptions={strokeColor:'#810FCB',strokeOpacity:1.0,strokeWeight:3.0,fillColor:'#810FCB',fillOpacity:0.5,};// Apply the style to a single boundary.featureLayer.style=(options)=>{if(options.feature.placeId=='ChIJ0zQtYiWsVHkRk8lRoB1RNPo'){// Hana, HIreturnfeatureStyleOptions;}};}initMap();
CSS
/* * Always set the map height explicitly to define the size of the div element * that contains the map. */gmp-map{height:100%;}/* * Optional: Makes the sample page fill the window. */html,body{height:100%;margin:0;padding:0;}
HTML
<html> <head> <title>Boundaries Simple</title> <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> <gmp-map center="20.773,-156.01" zoom="12" map-id="8b37d7206ccf0121d4414bb0"></gmp-map> </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/boundaries-simplenpminpmstart
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Last updated 2025-12-11 UTC.