letmap:google.maps.Map;//@ts-ignoreletfeatureLayer;asyncfunctioninitMap(){// Request needed libraries.const{Map}=awaitgoogle.maps.importLibrary("maps")asgoogle.maps.MapsLibrary;map=newMap(document.getElementById('map')asHTMLElement,{center:{lat:20.773,lng:-156.01},// Hana, HIzoom:12,// In the cloud console, configure this Map ID with a style that enables the// "Locality" feature layer.mapId:'a3efe1c035bad51b',// <YOUR_MAP_ID_HERE>,});//@ts-ignorefeatureLayer=map.getFeatureLayer('LOCALITY');// Define a style with purple fill and border.//@ts-ignoreconstfeatureStyleOptions:google.maps.FeatureStyleOptions={strokeColor:'#810FCB',strokeOpacity:1.0,strokeWeight:3.0,fillColor:'#810FCB',fillOpacity:0.5};// Apply the style to a single boundary.//@ts-ignorefeatureLayer.style=(options:{feature:{placeId:string;};})=>{if(options.feature.placeId=='ChIJ0zQtYiWsVHkRk8lRoB1RNPo'){// Hana, HIreturnfeatureStyleOptions;}};}initMap();
letmap;//@ts-ignoreletfeatureLayer;asyncfunctioninitMap(){// Request needed libraries.const{Map}=awaitgoogle.maps.importLibrary("maps");map=newMap(document.getElementById("map"),{center:{lat:20.773,lng:-156.01},// Hana, HIzoom:12,// In the cloud console, configure this Map ID with a style that enables the// "Locality" feature layer.mapId:"a3efe1c035bad51b",// <YOUR_MAP_ID_HERE>,});//@ts-ignorefeatureLayer=map.getFeatureLayer("LOCALITY");// Define a style with purple fill and border.//@ts-ignoreconstfeatureStyleOptions={strokeColor:"#810FCB",strokeOpacity:1.0,strokeWeight:3.0,fillColor:"#810FCB",fillOpacity:0.5,};// Apply the style to a single boundary.//@ts-ignorefeatureLayer.style=(options)=>{if(options.feature.placeId=="ChIJ0zQtYiWsVHkRk8lRoB1RNPo"){// Hana, HIreturnfeatureStyleOptions;}};}initMap();
/** 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;}
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.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-09-04 UTC."],[[["\u003cp\u003eThis example highlights the boundary polygon of a single region on a map using the Maps JavaScript API.\u003c/p\u003e\n"],["\u003cp\u003eIt utilizes the \u003ccode\u003eFeatureLayer\u003c/code\u003e to style the boundary with a purple fill and border for a specific place ID (Hana, HI).\u003c/p\u003e\n"],["\u003cp\u003eThe sample code is provided in TypeScript and JavaScript, allowing developers to choose their preferred language.\u003c/p\u003e\n"],["\u003cp\u003eUsers can explore the sample through JSFiddle, Google Cloud Shell, or by cloning the repository and running it locally.\u003c/p\u003e\n"]]],["The code initializes a Google Map centered on Hana, HI. It then retrieves the \"LOCALITY\" feature layer and defines a purple style with specific `strokeColor`, `strokeOpacity`, `strokeWeight`, `fillColor`, and `fillOpacity`. This style is applied exclusively to the boundary polygon of Hana, HI, identified by its `placeId`, highlighting it while leaving other regions unaffected. The map ID must be configured with the \"Locality\" feature layer enabled.\n"],null,["This example map demonstrates highlighting the boundary polygon for a single\nregion.\n\nRead the\n[documentation](/maps/documentation/javascript/dds-boundaries/style-polygon). \n\nTypeScript \n\n```typescript\nlet map: google.maps.Map;\n//@ts-ignore\nlet featureLayer;\n\nasync function initMap() {\n // Request needed libraries.\n const { Map } = await google.maps.importLibrary(\"maps\") as google.maps.MapsLibrary;\n\n map = new Map(document.getElementById('map') as HTMLElement, {\n center: { lat: 20.773, lng: -156.01 }, // Hana, HI\n zoom: 12,\n // In the cloud console, configure this Map ID with a style that enables the\n // \"Locality\" feature layer.\n mapId: 'a3efe1c035bad51b', // \u003cYOUR_MAP_ID_HERE\u003e,\n });\n\n //@ts-ignore\n featureLayer = map.getFeatureLayer('LOCALITY');\n\n // Define a style with purple fill and border.\n //@ts-ignore\n const featureStyleOptions: google.maps.FeatureStyleOptions = {\n strokeColor: '#810FCB',\n strokeOpacity: 1.0,\n strokeWeight: 3.0,\n fillColor: '#810FCB',\n fillOpacity: 0.5\n };\n\n // Apply the style to a single boundary.\n //@ts-ignore\n featureLayer.style = (options: { feature: { placeId: string; }; }) =\u003e {\n if (options.feature.placeId == 'ChIJ0zQtYiWsVHkRk8lRoB1RNPo') { // Hana, HI\n return featureStyleOptions;\n }\n };\n\n}\n\ninitMap();https://github.com/googlemaps/js-samples/blob/2683f7366fb27829401945d2a7e27d77ed2df8e5/samples/boundaries-simple/index.ts#L12-L53\n```\n| **Note:** Read the [guide](/maps/documentation/javascript/using-typescript) on using TypeScript and Google Maps.\n\nJavaScript \n\n```javascript\nlet map;\n//@ts-ignore\nlet featureLayer;\n\nasync function initMap() {\n // Request needed libraries.\n const { Map } = await google.maps.importLibrary(\"maps\");\n\n map = new Map(document.getElementById(\"map\"), {\n center: { lat: 20.773, lng: -156.01 }, // Hana, HI\n zoom: 12,\n // In the cloud console, configure this Map ID with a style that enables the\n // \"Locality\" feature layer.\n mapId: \"a3efe1c035bad51b\", // \u003cYOUR_MAP_ID_HERE\u003e,\n });\n //@ts-ignore\n featureLayer = map.getFeatureLayer(\"LOCALITY\");\n\n // Define a style with purple fill and border.\n //@ts-ignore\n const featureStyleOptions = {\n strokeColor: \"#810FCB\",\n strokeOpacity: 1.0,\n strokeWeight: 3.0,\n fillColor: \"#810FCB\",\n fillOpacity: 0.5,\n };\n\n // Apply the style to a single boundary.\n //@ts-ignore\n featureLayer.style = (options) =\u003e {\n if (options.feature.placeId == \"ChIJ0zQtYiWsVHkRk8lRoB1RNPo\") {\n // Hana, HI\n return featureStyleOptions;\n }\n };\n}\n\ninitMap();https://github.com/googlemaps/js-samples/blob/2683f7366fb27829401945d2a7e27d77ed2df8e5/dist/samples/boundaries-simple/docs/index.js#L10-L50\n```\n| **Note:** The JavaScript is compiled from the TypeScript snippet.\n\nCSS \n\n```css\n/* \n * Always set the map height explicitly to define the size of the div element\n * that contains the map. \n */\n#map {\n height: 100%;\n}\n\n/* \n * Optional: Makes the sample page fill the window. \n */\nhtml,\nbody {\n height: 100%;\n margin: 0;\n padding: 0;\n}\nhttps://github.com/googlemaps/js-samples/blob/2683f7366fb27829401945d2a7e27d77ed2df8e5/dist/samples/boundaries-simple/docs/style.css#L7-L24\n```\n\nHTML \n\n```html\n\u003chtml\u003e\n \u003chead\u003e\n \u003ctitle\u003eBoundaries Simple\u003c/title\u003e\n\n \u003clink rel=\"stylesheet\" type=\"text/css\" href=\"./style.css\" /\u003e\n \u003cscript type=\"module\" src=\"./index.js\"\u003e\u003c/script\u003e\n \u003c/head\u003e\n \u003cbody\u003e\n \u003cdiv id=\"map\"\u003e\u003c/div\u003e\n\n \u003c!-- prettier-ignore --\u003e\n \u003cscript\u003e(g=\u003e{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=()=\u003eh||(h=new Promise(async(f,n)=\u003e{await (a=m.createElement(\"script\"));e.set(\"libraries\",[...r]+\"\");for(k in g)e.set(k.replace(/[A-Z]/g,t=\u003e\"_\"+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=()=\u003eh=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)=\u003er.add(f)&&u().then(()=\u003ed[l](f,...n))})\n ({key: \"AIzaSyB41DRUbKWJHPxaFjMAwdrzWzbVKartNGg\", v: \"weekly\"});\u003c/script\u003e\n \u003c/body\u003e\n\u003c/html\u003ehttps://github.com/googlemaps/js-samples/blob/2683f7366fb27829401945d2a7e27d77ed2df8e5/dist/samples/boundaries-simple/docs/index.html#L8-L22\n```\n\nTry Sample \n[JSFiddle.net](https://jsfiddle.net/gh/get/library/pure/googlemaps/js-samples/tree/master/dist/samples/boundaries-simple/jsfiddle) [Google Cloud Shell](https://ssh.cloud.google.com/cloudshell/editor?cloudshell_git_repo=https%3A%2F%2Fgithub.com%2Fgooglemaps%2Fjs-samples&cloudshell_git_branch=sample-boundaries-simple&cloudshell_tutorial=cloud_shell_instructions.md&cloudshell_workspace=.)\n\nClone Sample\n\n\nGit and Node.js are required to run this sample locally. Follow these [instructions](https://docs.npmjs.com/downloading-and-installing-node-js-and-npm) to install Node.js and NPM. The following commands clone, install dependencies and start the sample application. \n\n git clone -b sample-boundaries-simple https://github.com/googlemaps/js-samples.git\n cd js-samples\n npm i\n npm start\n\n\nOther samples can be tried by switching to any branch beginning with `sample-`\u003cvar translate=\"no\"\u003eSAMPLE_NAME\u003c/var\u003e. \n\n git checkout sample-\u003cvar translate=\"no\"\u003e\u003cspan class=\"devsite-syntax-nx\"\u003eSAMPLE_NAME\u003c/span\u003e\u003c/var\u003e\n npm i\n npm start"]]
