Page Summary
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This example highlights the boundary polygon of a single region on a map using the Maps JavaScript API.
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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.
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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 single region.
Read the documentation .
TypeScript
let featureLayer ; async function initMap () { // Request needed libraries. ( await google . maps . importLibrary ( 'maps' )) as google . maps . MapsLibrary ; // Get the gmp-map element. const mapElement = document . querySelector ( 'gmp-map' ) as google . maps . MapElement ; // Get the inner map. const innerMap = mapElement . innerMap ; // Get the feature layer. featureLayer = innerMap . getFeatureLayer ( google . maps . FeatureType . LOCALITY ); // Define a style with purple fill and border. const featureStyleOptions : 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, HI return featureStyleOptions ; } }; } initMap ();
JavaScript
let featureLayer ; async function initMap () { // Request needed libraries. ( await google . maps . importLibrary ( 'maps' )); // Get the gmp-map element. const mapElement = document . querySelector ( 'gmp-map' ); // Get the inner map. const innerMap = mapElement . innerMap ; // Get the feature layer. featureLayer = innerMap . getFeatureLayer ( google . maps . FeatureType . LOCALITY ); // Define a style with purple fill and border. const featureStyleOptions = { 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, HI return featureStyleOptions ; } }; } 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 these instructions to install Node.js and NPM. The following commands clone, install dependencies and start the sample application.
git clone https : //github.com/googlemaps-samples/js-api-samples.gitcd samples / boundaries - simplenpm inpm start
