This example creates a map with tappable markers displaying a secret message.
Read the documentation.
TypeScript
function initMap(): void {
const map = new google.maps.Map(
document.getElementById("map") as HTMLElement,
{
zoom: 4,
center: { lat: -25.363882, lng: 131.044922 }
}
);
const bounds: google.maps.LatLngBoundsLiteral = {
north: -25.363882,
south: -31.203405,
east: 131.044922,
west: 125.244141
};
// Display the area between the location southWest and northEast.
map.fitBounds(bounds);
// Add 5 markers to map at random locations.
// For each of these markers, give them a title with their index, and when
// they are clicked they should open an infowindow with text from a secret
// message.
const secretMessages = ["This", "is", "the", "secret", "message"];
const lngSpan = bounds.east - bounds.west;
const latSpan = bounds.north - bounds.south;
for (let i = 0; i < secretMessages.length; ++i) {
const marker = new google.maps.Marker({
position: {
lat: bounds.south + latSpan * Math.random(),
lng: bounds.west + lngSpan * Math.random()
},
map: map
});
attachSecretMessage(marker, secretMessages[i]);
}
}
// Attaches an info window to a marker with the provided message. When the
// marker is clicked, the info window will open with the secret message.
function attachSecretMessage(
marker: google.maps.Marker,
secretMessage: string
) {
const infowindow = new google.maps.InfoWindow({
content: secretMessage
});
marker.addListener("click", () => {
infowindow.open(marker.get("map"), marker);
});
}
JavaScript
function initMap() {
const map = new google.maps.Map(document.getElementById("map"), {
zoom: 4,
center: { lat: -25.363882, lng: 131.044922 }
});
const bounds = {
north: -25.363882,
south: -31.203405,
east: 131.044922,
west: 125.244141
};
// Display the area between the location southWest and northEast.
map.fitBounds(bounds);
// Add 5 markers to map at random locations.
// For each of these markers, give them a title with their index, and when
// they are clicked they should open an infowindow with text from a secret
// message.
const secretMessages = ["This", "is", "the", "secret", "message"];
const lngSpan = bounds.east - bounds.west;
const latSpan = bounds.north - bounds.south;
for (let i = 0; i < secretMessages.length; ++i) {
const marker = new google.maps.Marker({
position: {
lat: bounds.south + latSpan * Math.random(),
lng: bounds.west + lngSpan * Math.random()
},
map: map
});
attachSecretMessage(marker, secretMessages[i]);
}
}
// Attaches an info window to a marker with the provided message. When the
// marker is clicked, the info window will open with the secret message.
function attachSecretMessage(marker, secretMessage) {
const infowindow = new google.maps.InfoWindow({
content: secretMessage
});
marker.addListener("click", () => {
infowindow.open(marker.get("map"), marker);
});
}
CSS
HTML
<!DOCTYPE html>
<html>
<head>
<title>Using Closures in Event Listeners</title>
<script src="https://polyfill.io/v3/polyfill.min.js?features=default"></script>
<script
src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&callback=initMap&libraries=&v=weekly"
defer
></script>
<link rel="stylesheet" type="text/css" href="./style.css" />
<script src="./app.js"></script>
</head>
<body>
<div id="map"></div>
</body>
</html>
All
<!DOCTYPE html>
<html>
<head>
<title>Using Closures in Event Listeners</title>
<script src="https://polyfill.io/v3/polyfill.min.js?features=default"></script>
<script
src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&callback=initMap&libraries=&v=weekly"
defer
></script>
<style type="text/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>
<script>
"use strict";
function initMap() {
const map = new google.maps.Map(document.getElementById("map"), {
zoom: 4,
center: {
lat: -25.363882,
lng: 131.044922
}
});
const bounds = {
north: -25.363882,
south: -31.203405,
east: 131.044922,
west: 125.244141
}; // Display the area between the location southWest and northEast.
map.fitBounds(bounds); // Add 5 markers to map at random locations.
// For each of these markers, give them a title with their index, and when
// they are clicked they should open an infowindow with text from a secret
// message.
const secretMessages = ["This", "is", "the", "secret", "message"];
const lngSpan = bounds.east - bounds.west;
const latSpan = bounds.north - bounds.south;
for (let i = 0; i < secretMessages.length; ++i) {
const marker = new google.maps.Marker({
position: {
lat: bounds.south + latSpan * Math.random(),
lng: bounds.west + lngSpan * Math.random()
},
map: map
});
attachSecretMessage(marker, secretMessages[i]);
}
} // Attaches an info window to a marker with the provided message. When the
// marker is clicked, the info window will open with the secret message.
function attachSecretMessage(marker, secretMessage) {
const infowindow = new google.maps.InfoWindow({
content: secretMessage
});
marker.addListener("click", () => {
infowindow.open(marker.get("map"), marker);
});
}
</script>
</head>
<body>
<div id="map"></div>
</body>
</html>
"use strict";
function initMap() {
const map = new google.maps.Map(document.getElementById("map"), {
zoom: 4,
center: {
lat: -25.363882,
lng: 131.044922
}
});
const bounds = {
north: -25.363882,
south: -31.203405,
east: 131.044922,
west: 125.244141
}; // Display the area between the location southWest and northEast.
map.fitBounds(bounds); // Add 5 markers to map at random locations.
// For each of these markers, give them a title with their index, and when
// they are clicked they should open an infowindow with text from a secret
// message.
const secretMessages = ["This", "is", "the", "secret", "message"];
const lngSpan = bounds.east - bounds.west;
const latSpan = bounds.north - bounds.south;
for (let i = 0; i < secretMessages.length; ++i) {
const marker = new google.maps.Marker({
position: {
lat: bounds.south + latSpan * Math.random(),
lng: bounds.west + lngSpan * Math.random()
},
map: map
});
attachSecretMessage(marker, secretMessages[i]);
}
} // Attaches an info window to a marker with the provided message. When the
// marker is clicked, the info window will open with the secret message.
function attachSecretMessage(marker, secretMessage) {
const infowindow = new google.maps.InfoWindow({
content: secretMessage
});
marker.addListener("click", () => {
infowindow.open(marker.get("map"), marker);
});
}
/* 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;
}
<!DOCTYPE html>
<html>
<head>
<title>Using Closures in Event Listeners</title>
<script src="https://polyfill.io/v3/polyfill.min.js?features=default"></script>
<script
src="https://maps.googleapis.com/maps/api/js?key=AIzaSyCb1xprYSpXd0q_yDsJ1W2UGhfl9_YGKU0&callback=initMap&libraries=&v=weekly"
defer
></script>
<!-- jsFiddle will insert css and js -->
</head>
<body>
<div id="map"></div>
</body>
</html>