Removing Polylines

This example adds a UI control that allows the user to remove the polyline from the map.

Read the documentation.

TypeScript

// This example adds a UI control allowing users to remove the polyline from the // map.  let flightPath: google.maps.Polyline; let map: google.maps.Map;  function initMap(): void {   map = new google.maps.Map(document.getElementById("map") as HTMLElement, {     zoom: 3,     center: { lat: 0, lng: -180 },     mapTypeId: "terrain",   });    const flightPathCoordinates: google.maps.LatLngLiteral[] = [     { lat: 37.772, lng: -122.214 },     { lat: 21.291, lng: -157.821 },     { lat: -18.142, lng: 178.431 },     { lat: -27.467, lng: 153.027 },   ];    flightPath = new google.maps.Polyline({     path: flightPathCoordinates,     strokeColor: "#FF0000",     strokeOpacity: 1.0,     strokeWeight: 2,   });    // add event listener for click event   document.getElementById("add-line")!.addEventListener("click", addLine);   document.getElementById("remove-line")!.addEventListener("click", removeLine);    // initialize with line   addLine(); }  function addLine(): void {   flightPath.setMap(map); }  function removeLine(): void {   flightPath.setMap(null); }  declare global {   interface Window {     initMap: () => void;   } } window.initMap = initMap;
index.ts

JavaScript

// This example adds a UI control allowing users to remove the polyline from the // map. let flightPath; let map;  function initMap() {   map = new google.maps.Map(document.getElementById("map"), {     zoom: 3,     center: { lat: 0, lng: -180 },     mapTypeId: "terrain",   });    const flightPathCoordinates = [     { lat: 37.772, lng: -122.214 },     { lat: 21.291, lng: -157.821 },     { lat: -18.142, lng: 178.431 },     { lat: -27.467, lng: 153.027 },   ];    flightPath = new google.maps.Polyline({     path: flightPathCoordinates,     strokeColor: "#FF0000",     strokeOpacity: 1.0,     strokeWeight: 2,   });   // add event listener for click event   document.getElementById("add-line").addEventListener("click", addLine);   document.getElementById("remove-line").addEventListener("click", removeLine);   // initialize with line   addLine(); }  function addLine() {   flightPath.setMap(map); }  function removeLine() {   flightPath.setMap(null); }  window.initMap = initMap;
index.js

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; }  #floating-panel {   position: absolute;   top: 10px;   left: 25%;   z-index: 5;   background-color: #fff;   padding: 5px;   border: 1px solid #999;   text-align: center;   font-family: "Roboto", "sans-serif";   line-height: 30px;   padding-left: 10px; } 
style.css

HTML

<html>   <head>     <title>Removing Polylines</title>      <link rel="stylesheet" type="text/css" href="./style.css" />     <script type="module" src="./index.js"></script>   </head>   <body>     <div id="floating-panel">       <input id="remove-line" type="button" value="Remove line" />       <input id="add-line" type="button" value="Restore line" />     </div>     <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>
index.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 -b sample-polyline-remove https://github.com/googlemaps/js-samples.git   cd js-samples   npm i   npm start

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

  git checkout sample-SAMPLE_NAME   npm i   npm start