Delay Loading Dynamic Map

This example uses a static map as a placeholder for a dynamic map. A click event handler on the placeholder and button triggers the loading of the Google Maps JavaScript API and replaces the static map with a dynamic map.

The example depends on @googlemaps/js-api-loader to dynamically append the Google Maps JavaScript script tag to the html. This can be installed with the following NPM install.

npm install @googlemaps/js-api-loader

Alternatively, the following script can be added to the HTML document.

<script src="https://unpkg.com/@googlemaps/js-api-loader/dist/index.min.js"></script>

The full sample code is below.

TypeScript

import { Loader } from "@googlemaps/js-api-loader";

let map: google.maps.Map;

const center = { lat: 41.90476224706472, lng: 12.49822074385094 };
const zoom = 14;
const url = "https://maps.googleapis.com/maps/api/staticmap";

// @ts-ignore google.maps.plugins
const loader = new Loader({
  apiKey: "YOUR_API_KEY",
  version: "weekly",
});

document.addEventListener("DOMContentLoaded", () => {
  const wrapper = document.getElementById("wrapper") as HTMLButtonElement;

  wrapper.style.backgroundImage = `url(${url}?center=${center.lat},${center.lng}&zoom=${zoom}&scale=2&size=${wrapper.clientWidth}x${wrapper.clientHeight}&key=YOUR_API_KEY)`;

  wrapper.addEventListener("click", () => {
    wrapper.remove();

    loader.load().then(() => {
      map = new google.maps.Map(document.getElementById("map") as HTMLElement, {
        center,
        zoom,
      });
    });
  });
});
index.ts

JavaScript

import { Loader } from "@googlemaps/js-api-loader";
let map;
const center = { lat: 41.90476224706472, lng: 12.49822074385094 };
const zoom = 14;
const url = "https://maps.googleapis.com/maps/api/staticmap";
const loader = new Loader({
  apiKey: "YOUR_API_KEY",
  version: "weekly",
});

document.addEventListener("DOMContentLoaded", () => {
  const wrapper = document.getElementById("wrapper");

  wrapper.style.backgroundImage = `url(${url}?center=${center.lat},${center.lng}&zoom=${zoom}&scale=2&size=${wrapper.clientWidth}x${wrapper.clientHeight}&key=YOUR_API_KEY)`;
  wrapper.addEventListener("click", () => {
    wrapper.remove();
    loader.load().then(() => {
      map = new google.maps.Map(document.getElementById("map"), {
        center,
        zoom,
      });
    });
  });
});

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;
}

:root {
  --mdc-theme-primary: #1a73e8;
}

#wrapper {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background-size: cover;
}

style.css

HTML

<!DOCTYPE html>
<html>
  <head>
    <title>Programmatically Load Google Maps JS</title>
    <script src="https://polyfill.io/v3/polyfill.min.js?features=default"></script>
    <!-- Use Material Design Button CSS-->
    <link
      href="https://unpkg.com/material-components-web@6.0.0/dist/material-components-web.css"
      rel="stylesheet"
    />

    <link rel="stylesheet" type="text/css" href="./style.css" />
    <script src="./index.js"></script>
  </head>
  <body>
    <div id="map">
      <div id="wrapper">
        <button id="load_map_button" class="mdc-button mdc-button--raised">
          Load Dynamic Map
        </button>
      </div>
    </div>
  </body>
</html>
sample.html

Try Sample

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. 

  git clone -b sample-programmatic-load-button https://github.com/googlemaps/js-samples.git
  cd js-samples
  npm i
  npm start

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

  git checkout sample-SAMPLE_NAME
  npm i
  npm start