Get a Maps Demo Key: Try out select Maps JavaScript API and Places UI Kit features at no cost with a Maps Demo Key—no billing information required.

Polygon Arrays

Spark icon

Page Summary

This example demonstrates creating and displaying a polygon on a map using the Google Maps JavaScript API.
The polygon is interactive, displaying an info window with coordinate details upon clicking.
The code provides examples in both JavaScript and TypeScript, showcasing how to define polygon properties and handle events.
Users can interact with a live demo of the map via provided links to JSFiddle and Google Cloud Shell.
The sample code can be cloned and run locally using Git and Node.js for further exploration and customization.

This example creates a map with a simple polygon which displays information in response to a click event.

Read the documentation.

[フレーム]

TypeScript

// This example creates a simple polygon representing the Bermuda Triangle.
// When the user clicks on the polygon an info window opens, showing
// information about the polygon's coordinates.
letmap:google.maps.Map;
letinfoWindow:google.maps.InfoWindow;
functioninitMap():void{
map=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.
consttriangleCoords:google.maps.LatLngLiteral[]=[
{lat:25.774,lng:-80.19},
{lat:18.466,lng:-66.118},
{lat:32.321,lng:-64.757},
];
// Construct the polygon.
constbermudaTriangle=newgoogle.maps.Polygon({
paths:triangleCoords,
strokeColor:"#FF0000",
strokeOpacity:0.8,
strokeWeight:3,
fillColor:"#FF0000",
fillOpacity:0.35,
});
bermudaTriangle.setMap(map);
// Add a listener for the click event.
bermudaTriangle.addListener("click",showArrays);
infoWindow=newgoogle.maps.InfoWindow();
}
functionshowArrays(event:any){
// Since this polygon has only one path, we can call getPath() to return the
// MVCArray of LatLngs.
// @ts-ignore
constpolygon=thisasgoogle.maps.Polygon;
constvertices=polygon.getPath();
letcontentString=
"<b>Bermuda Triangle polygon</b><br>"+
"Clicked location: <br>"+
event.latLng.lat()+
","+
event.latLng.lng()+
"<br>";
// Iterate over the vertices.
for(leti=0;i < vertices.getLength();i++){
constxy=vertices.getAt(i);
contentString+=
"<br>"+"Coordinate "+i+":<br>"+xy.lat()+","+xy.lng();
}
// Replace the info window's content and position.
infoWindow.setContent(contentString);
infoWindow.setPosition(event.latLng);
infoWindow.open(map);
}
declareglobal{
interfaceWindow{
initMap:()=>void;
}
}
window.initMap=initMap;index.ts

JavaScript

// This example creates a simple polygon representing the Bermuda Triangle.
// When the user clicks on the polygon an info window opens, showing
// information about the polygon's coordinates.
letmap;
letinfoWindow;
functioninitMap(){
map=newgoogle.maps.Map(document.getElementById("map"),{
zoom:5,
center:{lat:24.886,lng:-70.268},
mapTypeId:"terrain",
});
// Define the LatLng coordinates for the polygon.
consttriangleCoords=[
{lat:25.774,lng:-80.19},
{lat:18.466,lng:-66.118},
{lat:32.321,lng:-64.757},
];
// Construct the polygon.
constbermudaTriangle=newgoogle.maps.Polygon({
paths:triangleCoords,
strokeColor:"#FF0000",
strokeOpacity:0.8,
strokeWeight:3,
fillColor:"#FF0000",
fillOpacity:0.35,
});
bermudaTriangle.setMap(map);
// Add a listener for the click event.
bermudaTriangle.addListener("click",showArrays);
infoWindow=newgoogle.maps.InfoWindow();
}
functionshowArrays(event){
// Since this polygon has only one path, we can call getPath() to return the
// MVCArray of LatLngs.
// @ts-ignore
constpolygon=this;
constvertices=polygon.getPath();
letcontentString=
"<b>Bermuda Triangle polygon</b><br>"+
"Clicked location: <br>"+
event.latLng.lat()+
","+
event.latLng.lng()+
"<br>";
// Iterate over the vertices.
for(leti=0;i < vertices.getLength();i++){
constxy=vertices.getAt(i);
contentString+=
"<br>"+"Coordinate "+i+":<br>"+xy.lat()+","+xy.lng();
}
// Replace the info window's content and position.
infoWindow.setContent(contentString);
infoWindow.setPosition(event.latLng);
infoWindow.open(map);
}
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;
}
style.css

HTML

<html>
 <head>
 <title>Polygon Arrays</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>index.html

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-polygon-arrayshttps://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