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Complex Polylines

  • This example demonstrates drawing polylines on a map by clicking to add points.

  • Polylines are created using thegoogle.maps.Polyline class and become visible after two or more points are added.

  • Each click on the map adds a point to the polyline and places a marker indicating the point's order.

  • The sample code is provided in both TypeScript and JavaScript, along with HTML and CSS for styling and structure.

  • You 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.

Click two or more points on the map to draw polylines.

Read thedocumentation.

TypeScript

// 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;
Note: Read theguide on using TypeScript and Google Maps.

JavaScript

// 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;
Note: The JavaScript is compiled from the TypeScript snippet.

CSS

/* * 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

<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></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>

Try Sample

Clone Sample

Git and Node.js are required to run this sample locally. Follow theseinstructions to install Node.js and NPM. The following commands clone, install dependencies and start the sample application.

gitclone-bsample-polyline-complexhttps://github.com/googlemaps/js-samples.gitcdjs-samplesnpminpmstart

Other samples can be tried by switching to any branch beginning withsample-SAMPLE_NAME.

gitcheckoutsample-SAMPLE_NAMEnpminpmstart

Except as otherwise noted, the content of this page is licensed under theCreative Commons Attribution 4.0 License, and code samples are licensed under theApache 2.0 License. For details, see theGoogle Developers Site Policies. Java is a registered trademark of Oracle and/or its affiliates.

Last updated 2025-12-18 UTC.