Listening to Events

This example adds a user-editable rectangle to the map. When the user changes the bounds of the rectangle, an info window pops up displaying the new bounds.

Read thedocumentation.

TypeScript

// This example adds a user-editable rectangle to the map.
// When the user changes the bounds of the rectangle,
// an info window pops up displaying the new bounds.

letrectangle:google.maps.Rectangle;
letmap:google.maps.Map;

letinfoWindow:google.maps.InfoWindow;

functioninitMap():void{
map=newgoogle.maps.Map(document.getElementById("map")asHTMLElement,{
center:{lat:44.5452,lng:-78.5389},
zoom:9,
});

constbounds={
north:44.599,
south:44.49,
east:-78.443,
west:-78.649,
};

// Define the rectangle and set its editable property to true.
rectangle=newgoogle.maps.Rectangle({
bounds:bounds,
editable:true,
draggable:true,
});

rectangle.setMap(map);

// Add an event listener on the rectangle.
rectangle.addListener("bounds_changed",showNewRect);

// Define an info window on the map.
infoWindow=newgoogle.maps.InfoWindow();
}

/** Show the new coordinates for the rectangle in an info window. */
functionshowNewRect(){
constne=rectangle.getBounds()!.getNorthEast();
constsw=rectangle.getBounds()!.getSouthWest();

constcontentString=
"<b>Rectanglemoved.</b><br>"+
"Newnorth-eastcorner:"+
ne.lat()+
","+
ne.lng()+
"<br> "+
"Newsouth-westcorner:"+
sw.lat()+
","+
sw.lng();

// Set the info window's content and position.
infoWindow.setContent(contentString);
infoWindow.setPosition(ne);

infoWindow.open(map);
}

declareglobal{
interfaceWindow{
initMap:()=>void;
}
}
window.initMap=initMap;
index.ts

JavaScript

// This example adds a user-editable rectangle to the map.
// When the user changes the bounds of the rectangle,
// an info window pops up displaying the new bounds.
letrectangle;
letmap;
letinfoWindow;

functioninitMap(){
map=newgoogle.maps.Map(document.getElementById("map"),{
center:{lat:44.5452,lng:-78.5389},
zoom:9,
});

constbounds={
north:44.599,
south:44.49,
east:-78.443,
west:-78.649,
};

// Define the rectangle and set its editable property to true.
rectangle=newgoogle.maps.Rectangle({
bounds:bounds,
editable:true,
draggable:true,
});
rectangle.setMap(map);
// Add an event listener on the rectangle.
rectangle.addListener("bounds_changed",showNewRect);
// Define an info window on the map.
infoWindow=newgoogle.maps.InfoWindow();
}

/** Show the new coordinates for the rectangle in an info window. */
functionshowNewRect(){
constne=rectangle.getBounds().getNorthEast();
constsw=rectangle.getBounds().getSouthWest();
constcontentString=
"<b>Rectanglemoved.</b><br>"+
"Newnorth-eastcorner:"+
ne.lat()+
","+
ne.lng()+
"<br> "+
"Newsouth-westcorner:"+
sw.lat()+
","+
sw.lng();

// Set the info window's content and position.
infoWindow.setContent(contentString);
infoWindow.setPosition(ne);
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>Listening to Events</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 /maps/documentation/javascript/load-maps-js-api
for more information.
-->
<script
src= "https://maps.googleapis /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 theseinstructionsto install Node.js and NPM. The following commands clone, install dependencies and start the sample application. 

gitclone-bsample-rectangle-eventhttps://github /googlemaps/js-samples.git
cdjs-samples
npmi
npmstart

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

gitcheckoutsample-SAMPLE_NAME
npmi
npmstart