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This example creates a map with a simple polygon, to demonstrate the autoclose behavior for polygons. Note that only three coordinates are defined. There's no need to specify the final coordinates to complete the polygon, because the Google Maps JavaScript API will automatically draw the closing side.
// This example creates a simple polygon representing the Bermuda Triangle. Note// that the code specifies only three LatLng coordinates for the polygon. The// API automatically draws a stroke connecting the last LatLng back to the first// LatLng.functioninitMap():void{constmap=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's path. Note that there's// no need to specify the final coordinates to complete the polygon, because// The Google Maps JavaScript API will automatically draw the closing side.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,strokeColor:"#FF0000",strokeOpacity:0.8,strokeWeight:3,fillColor:"#FF0000",fillOpacity:0.35,});bermudaTriangle.setMap(map);}declareglobal{interfaceWindow{initMap:()=>void;}}window.initMap=initMap;
// This example creates a simple polygon representing the Bermuda Triangle. Note// that the code specifies only three LatLng coordinates for the polygon. The// API automatically draws a stroke connecting the last LatLng back to the first// LatLng.functioninitMap(){constmap=newgoogle.maps.Map(document.getElementById("map"),{zoom:5,center:{lat:24.886,lng:-70.268},mapTypeId:"terrain",});// Define the LatLng coordinates for the polygon's path. Note that there's// no need to specify the final coordinates to complete the polygon, because// The Google Maps JavaScript API will automatically draw the closing side.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,strokeColor:"#FF0000",strokeOpacity:0.8,strokeWeight:3,fillColor:"#FF0000",fillOpacity:0.35,});bermudaTriangle.setMap(map);}window.initMap=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;}
<html> <head> <title>Polygon Auto-Completion</title> <link rel="stylesheet" type="text/css" href="./style.css" /> <script type="module" src="./index.js"></script> </head> <body> <div id="map"></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>
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.
[[["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 2025-08-20 UTC."],[[["\u003cp\u003eThis example demonstrates the automatic closure of polygons when using the Google Maps JavaScript API.\u003c/p\u003e\n"],["\u003cp\u003eYou only need to define three coordinates for the polygon, as the API automatically connects the last point to the first.\u003c/p\u003e\n"],["\u003cp\u003eThe example uses a simple polygon representing the Bermuda Triangle to illustrate this behavior.\u003c/p\u003e\n"],["\u003cp\u003eBoth JavaScript and TypeScript code snippets are provided to showcase the implementation.\u003c/p\u003e\n"],["\u003cp\u003eThe sample webpage uses CSS to ensure the map fills the window and HTML to structure the content and load the Google Maps API.\u003c/p\u003e\n"]]],[],null,["This example creates a map with a simple polygon, to demonstrate the autoclose\nbehavior for polygons. Note that only three coordinates are defined. There's no\nneed to specify the final coordinates to complete the polygon, because the\nGoogle Maps JavaScript API will automatically draw the closing side.\n\nRead the [documentation](/maps/documentation/javascript/shapes#polygon_add). \n\nTypeScript \n\n```typescript\n// This example creates a simple polygon representing the Bermuda Triangle. Note\n// that the code specifies only three LatLng coordinates for the polygon. The\n// API automatically draws a stroke connecting the last LatLng back to the first\n// LatLng.\n\nfunction initMap(): void {\n const map = new google.maps.Map(\n document.getElementById(\"map\") as HTMLElement,\n {\n zoom: 5,\n center: { lat: 24.886, lng: -70.268 },\n mapTypeId: \"terrain\",\n }\n );\n\n // Define the LatLng coordinates for the polygon's path. Note that there's\n // no need to specify the final coordinates to complete the polygon, because\n // The Google Maps JavaScript API will automatically draw the closing side.\n const triangleCoords = [\n { lat: 25.774, lng: -80.19 },\n { lat: 18.466, lng: -66.118 },\n { lat: 32.321, lng: -64.757 },\n ];\n\n const bermudaTriangle = new google.maps.Polygon({\n paths: triangleCoords,\n strokeColor: \"#FF0000\",\n strokeOpacity: 0.8,\n strokeWeight: 3,\n fillColor: \"#FF0000\",\n fillOpacity: 0.35,\n });\n\n bermudaTriangle.setMap(map);\n}\n\ndeclare global {\n interface Window {\n initMap: () =\u003e void;\n }\n}\nwindow.initMap = initMap;https://github.com/googlemaps/js-samples/blob/2683f7366fb27829401945d2a7e27d77ed2df8e5/samples/polygon-autoclose/index.ts#L8-L49\n```\n| **Note:** Read the [guide](/maps/documentation/javascript/using-typescript) on using TypeScript and Google Maps.\n\nJavaScript \n\n```javascript\n// This example creates a simple polygon representing the Bermuda Triangle. Note\n// that the code specifies only three LatLng coordinates for the polygon. The\n// API automatically draws a stroke connecting the last LatLng back to the first\n// LatLng.\nfunction initMap() {\n const map = new google.maps.Map(document.getElementById(\"map\"), {\n zoom: 5,\n center: { lat: 24.886, lng: -70.268 },\n mapTypeId: \"terrain\",\n });\n // Define the LatLng coordinates for the polygon's path. Note that there's\n // no need to specify the final coordinates to complete the polygon, because\n // The Google Maps JavaScript API will automatically draw the closing side.\n const triangleCoords = [\n { lat: 25.774, lng: -80.19 },\n { lat: 18.466, lng: -66.118 },\n { lat: 32.321, lng: -64.757 },\n ];\n const bermudaTriangle = new google.maps.Polygon({\n paths: triangleCoords,\n strokeColor: \"#FF0000\",\n strokeOpacity: 0.8,\n strokeWeight: 3,\n fillColor: \"#FF0000\",\n fillOpacity: 0.35,\n });\n\n bermudaTriangle.setMap(map);\n}\n\nwindow.initMap = initMap;https://github.com/googlemaps/js-samples/blob/2683f7366fb27829401945d2a7e27d77ed2df8e5/dist/samples/polygon-autoclose/docs/index.js#L7-L37\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/polygon-autoclose/docs/style.css#L7-L24\n```\n\nHTML \n\n```html\n\u003chtml\u003e\n \u003chead\u003e\n \u003ctitle\u003ePolygon Auto-Completion\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!-- \n The `defer` attribute causes the script to execute after the full HTML\n document has been parsed. For non-blocking uses, avoiding race conditions,\n and consistent behavior across browsers, consider loading using Promises. See\n https://developers.google.com/maps/documentation/javascript/load-maps-js-api\n for more information.\n --\u003e\n \u003cscript\n src=\"https://maps.googleapis.com/maps/api/js?key=AIzaSyB41DRUbKWJHPxaFjMAwdrzWzbVKartNGg&callback=initMap&v=weekly\"\n defer\n \u003e\u003c/script\u003e\n \u003c/body\u003e\n\u003c/html\u003ehttps://github.com/googlemaps/js-samples/blob/2683f7366fb27829401945d2a7e27d77ed2df8e5/dist/samples/polygon-autoclose/docs/index.html#L8-L30\n```\n\nTry Sample \n[JSFiddle.net](https://jsfiddle.net/gh/get/library/pure/googlemaps/js-samples/tree/master/dist/samples/polygon-autoclose/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-polygon-autoclose&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-polygon-autoclose 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"]]
