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Removing Polylines

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Page Summary

This example demonstrates how to add and remove a polyline from a Google Map using JavaScript/TypeScript.
It provides UI controls (buttons) to trigger the addition and removal of the polyline.
The polyline is initialized with a predefined path and styling.
Users can interact with the controls to dynamically show or hide the polyline on the map.
The sample code includes HTML, CSS, and JavaScript/TypeScript components for implementation.

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

Read the documentation.

[フレーム]

TypeScript

// This example adds a UI control allowing users to remove the polyline from the
// map.
letflightPath:google.maps.Polyline;
letmap:google.maps.Map;
functioninitMap():void{
map=newgoogle.maps.Map(document.getElementById("map")asHTMLElement,{
zoom:3,
center:{lat:0,lng:-180},
mapTypeId:"terrain",
});
constflightPathCoordinates: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=newgoogle.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();
}
functionaddLine():void{
flightPath.setMap(map);
}
functionremoveLine():void{
flightPath.setMap(null);
}
declareglobal{
interfaceWindow{
initMap:()=>void;
}
}
window.initMap=initMap;index.ts

JavaScript

// This example adds a UI control allowing users to remove the polyline from the
// map.
letflightPath;
letmap;
functioninitMap(){
map=newgoogle.maps.Map(document.getElementById("map"),{
zoom:3,
center:{lat:0,lng:-180},
mapTypeId:"terrain",
});
constflightPathCoordinates=[
{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=newgoogle.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();
}
functionaddLine(){
flightPath.setMap(map);
}
functionremoveLine(){
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:1pxsolid#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

JSFiddle.net Google Cloud Shell

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.

gitclone-bsample-polyline-removehttps://github.com/googlemaps/js-samples.git
cdjs-samples
npmi
npmstart

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

gitcheckoutsample-SAMPLE_NAME
npmi
npmstart