Marker Labels

This example creates a map where each click by the user creates a marker that's labeled with a single alphabetical character.

Read the documentation.

TypeScript

// In the following example, markers appear when the user clicks on the map.
// Each marker is labeled with a single alphabetical character.
const labels = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
let labelIndex = 0;

function initMap(): void {
  const bangalore = { lat: 12.97, lng: 77.59 };
  const map = new google.maps.Map(
    document.getElementById("map") as HTMLElement,
    {
      zoom: 12,
      center: bangalore,
    }
  );

  // This event listener calls addMarker() when the map is clicked.
  google.maps.event.addListener(map, "click", (event) => {
    addMarker(event.latLng, map);
  });

  // Add a marker at the center of the map.
  addMarker(bangalore, map);
}

// Adds a marker to the map.
function addMarker(location: google.maps.LatLngLiteral, map: google.maps.Map) {
  // Add the marker at the clicked location, and add the next-available label
  // from the array of alphabetical characters.
  new google.maps.Marker({
    position: location,
    label: labels[labelIndex++ % labels.length],
    map: map,
  });
}index.ts

JavaScript

// In the following example, markers appear when the user clicks on the map.
// Each marker is labeled with a single alphabetical character.
const labels = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
let labelIndex = 0;

function initMap() {
  const bangalore = { lat: 12.97, lng: 77.59 };
  const map = new google.maps.Map(document.getElementById("map"), {
    zoom: 12,
    center: bangalore,
  });
  // This event listener calls addMarker() when the map is clicked.
  google.maps.event.addListener(map, "click", (event) => {
    addMarker(event.latLng, map);
  });
  // Add a marker at the center of the map.
  addMarker(bangalore, map);
}

// Adds a marker to the map.
function addMarker(location, map) {
  // Add the marker at the clicked location, and add the next-available label
  // from the array of alphabetical characters.
  new google.maps.Marker({
    position: location,
    label: labels[labelIndex++ % labels.length],
    map: map,
  });
}
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

<!DOCTYPE html>
<html>
  <head>
    <title>Marker Labels</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="./index.js"></script>
  </head>
  <body>
    <div id="map"></div>
  </body>
</html>sample.html

All

<!DOCTYPE html>
<html>
  <head>
    <title>Marker Labels</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>
      // In the following example, markers appear when the user clicks on the map.
      // Each marker is labeled with a single alphabetical character.
      const labels = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
      let labelIndex = 0;

      function initMap() {
        const bangalore = { lat: 12.97, lng: 77.59 };
        const map = new google.maps.Map(document.getElementById("map"), {
          zoom: 12,
          center: bangalore,
        });
        // This event listener calls addMarker() when the map is clicked.
        google.maps.event.addListener(map, "click", (event) => {
          addMarker(event.latLng, map);
        });
        // Add a marker at the center of the map.
        addMarker(bangalore, map);
      }

      // Adds a marker to the map.
      function addMarker(location, map) {
        // Add the marker at the clicked location, and add the next-available label
        // from the array of alphabetical characters.
        new google.maps.Marker({
          position: location,
          label: labels[labelIndex++ % labels.length],
          map: map,
        });
      }
    </script>
  </head>
  <body>
    <div id="map"></div>
  </body>
</html>
inline.html

// In the following example, markers appear when the user clicks on the map. // Each marker is labeled with a single alphabetical character. const labels = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"; let labelIndex = 0; function initMap() { const bangalore = { lat: 12.97, lng: 77.59 }; const map = new google.maps.Map(document.getElementById("map"), { zoom: 12, center: bangalore, }); // This event listener calls addMarker() when the map is clicked. google.maps.event.addListener(map, "click", (event) => { addMarker(event.latLng, map); }); // Add a marker at the center of the map. addMarker(bangalore, map); } // Adds a marker to the map. function addMarker(location, map) { // Add the marker at the clicked location, and add the next-available label // from the array of alphabetical characters. new google.maps.Marker({ position: location, label: labels[labelIndex++ % labels.length], map: map, }); }

/* 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>Marker Labels</title> <script src="https://polyfill.io/v3/polyfill.min.js?features=default"></script> <script src="https://maps.googleapis.com/maps/api/js?key=AIzaSyBIwzALxUPNbatRBj3Xi1Uhp0fFzwWNBkE&callback=initMap&libraries=&v=weekly" defer ></script>  </head> <body> <div id="map"></div> </body> </html>

Create a starter application from sample

A skeleton starter application using TypeScript, Webpack, and Babel can be generated from this sample using one of the methods below.

Run Locally

Node.js is required to run this sample locally. Follow these instructions to install Node.js and NPM.

npx @googlemaps/js-samples init marker-labels DESTINATION_FOLDER

Run in Google Cloud Shell

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Run in Cloud Shell