// This example creates an interactive map which constructs a polyline based on// user clicks. Note that the polyline only appears once its path property// contains two LatLng coordinates.letpoly:google.maps.Polyline;letmap:google.maps.Map;functioninitMap():void{map=newgoogle.maps.Map(document.getElementById("map")asHTMLElement,{zoom:7,center:{lat:41.879,lng:-87.624},// Center the map on Chicago, USA.});poly=newgoogle.maps.Polyline({strokeColor:"#000000",strokeOpacity:1.0,strokeWeight:3,});poly.setMap(map);// Add a listener for the click eventmap.addListener("click",addLatLng);}// Handles click events on a map, and adds a new point to the Polyline.functionaddLatLng(event:google.maps.MapMouseEvent){constpath=poly.getPath();// Because path is an MVCArray, we can simply append a new coordinate// and it will automatically appear.path.push(event.latLngasgoogle.maps.LatLng);// Add a new marker at the new plotted point on the polyline.newgoogle.maps.Marker({position:event.latLng,title:"#"+path.getLength(),map:map,});}declareglobal{interfaceWindow{initMap:()=>void;}}window.initMap=initMap;
// This example creates an interactive map which constructs a polyline based on// user clicks. Note that the polyline only appears once its path property// contains two LatLng coordinates.letpoly;letmap;functioninitMap(){map=newgoogle.maps.Map(document.getElementById("map"),{zoom:7,center:{lat:41.879,lng:-87.624},// Center the map on Chicago, USA.});poly=newgoogle.maps.Polyline({strokeColor:"#000000",strokeOpacity:1.0,strokeWeight:3,});poly.setMap(map);// Add a listener for the click eventmap.addListener("click",addLatLng);}// Handles click events on a map, and adds a new point to the Polyline.functionaddLatLng(event){constpath=poly.getPath();// Because path is an MVCArray, we can simply append a new coordinate// and it will automatically appear.path.push(event.latLng);// Add a new marker at the new plotted point on the polyline.newgoogle.maps.Marker({position:event.latLng,title:"#"+path.getLength(),map: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>Complex Polylines</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 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 demonstrates drawing polylines on a map by clicking to add points.\u003c/p\u003e\n"],["\u003cp\u003ePolylines are created using the \u003ccode\u003egoogle.maps.Polyline\u003c/code\u003e class and become visible after two or more points are added.\u003c/p\u003e\n"],["\u003cp\u003eEach click on the map adds a point to the polyline and places a marker indicating the point's order.\u003c/p\u003e\n"],["\u003cp\u003eThe sample code is provided in both TypeScript and JavaScript, along with HTML and CSS for styling and structure.\u003c/p\u003e\n"],["\u003cp\u003eYou can interact with the sample using provided links to JSFiddle or Google Cloud Shell, or clone and run it locally with Git and Node.js.\u003c/p\u003e\n"]]],[],null,["# Complex Polylines\n\nClick two or more points on the map to draw polylines.\n\nRead the\n[documentation](/maps/documentation/javascript/shapes#polyline_inspect). \n\n### TypeScript\n\n```typescript\n// This example creates an interactive map which constructs a polyline based on\n// user clicks. Note that the polyline only appears once its path property\n// contains two LatLng coordinates.\n\nlet poly: google.maps.Polyline;\nlet map: google.maps.Map;\n\nfunction initMap(): void {\n map = new google.maps.Map(document.getElementById(\"map\") as HTMLElement, {\n zoom: 7,\n center: { lat: 41.879, lng: -87.624 }, // Center the map on Chicago, USA.\n });\n\n poly = new google.maps.Polyline({\n strokeColor: \"#000000\",\n strokeOpacity: 1.0,\n strokeWeight: 3,\n });\n poly.setMap(map);\n\n // Add a listener for the click event\n map.addListener(\"click\", addLatLng);\n}\n\n// Handles click events on a map, and adds a new point to the Polyline.\nfunction addLatLng(event: google.maps.MapMouseEvent) {\n const path = poly.getPath();\n\n // Because path is an MVCArray, we can simply append a new coordinate\n // and it will automatically appear.\n path.push(event.latLng as google.maps.LatLng);\n\n // Add a new marker at the new plotted point on the polyline.\n new google.maps.Marker({\n position: event.latLng,\n title: \"#\" + path.getLength(),\n map: map,\n });\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/polyline-complex/index.ts#L8-L53\n```\n| **Note:** Read the [guide](/maps/documentation/javascript/using-typescript) on using TypeScript and Google Maps.\n\n### JavaScript\n\n```javascript\n// This example creates an interactive map which constructs a polyline based on\n// user clicks. Note that the polyline only appears once its path property\n// contains two LatLng coordinates.\nlet poly;\nlet map;\n\nfunction initMap() {\n map = new google.maps.Map(document.getElementById(\"map\"), {\n zoom: 7,\n center: { lat: 41.879, lng: -87.624 }, // Center the map on Chicago, USA.\n });\n poly = new google.maps.Polyline({\n strokeColor: \"#000000\",\n strokeOpacity: 1.0,\n strokeWeight: 3,\n });\n poly.setMap(map);\n // Add a listener for the click event\n map.addListener(\"click\", addLatLng);\n}\n\n// Handles click events on a map, and adds a new point to the Polyline.\nfunction addLatLng(event) {\n const path = poly.getPath();\n\n // Because path is an MVCArray, we can simply append a new coordinate\n // and it will automatically appear.\n path.push(event.latLng);\n // Add a new marker at the new plotted point on the polyline.\n new google.maps.Marker({\n position: event.latLng,\n title: \"#\" + path.getLength(),\n map: map,\n });\n}\n\nwindow.initMap = initMap;https://github.com/googlemaps/js-samples/blob/2683f7366fb27829401945d2a7e27d77ed2df8e5/dist/samples/polyline-complex/docs/index.js#L7-L43\n```\n| **Note:** The JavaScript is compiled from the TypeScript snippet.\n\n### CSS\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/polyline-complex/docs/style.css#L7-L24\n```\n\n### HTML\n\n```html\n\u003chtml\u003e\n \u003chead\u003e\n \u003ctitle\u003eComplex Polylines\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/polyline-complex/docs/index.html#L8-L30\n```\n\n### Try Sample\n\n[JSFiddle.net](https://jsfiddle.net/gh/get/library/pure/googlemaps/js-samples/tree/master/dist/samples/polyline-complex/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-polyline-complex&cloudshell_tutorial=cloud_shell_instructions.md&cloudshell_workspace=.)\n\n### Clone 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-polyline-complex 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"]]
