In this example, the Maps API is loaded synchronously. We omitted the defer
attribute from the script
tag that loads the API, and we also omitted the
callback parameter.
<!DOCTYPE html> <html> <head> <title>Synchronous Loading</title> <script src="https://polyfill.io/v3/polyfill.min.js?features=default"></script> <link rel="stylesheet" type="text/css" href="./style.css" /> </head> <body> <div id="map"></div> <script src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&v=weekly"></script> <script src="./index.js"></script> </body> </html>
When the API is loaded synchronously, subsequent script
tags will not execute
until the API is fully loaded. Because of this, the final script
tag can call
new google.maps.Map
and assume that google.maps.Map
has been defined.
Read the documentation.
TypeScript
const map = new google.maps.Map(document.getElementById("map") as HTMLElement, { center: { lat: -34.397, lng: 150.644 }, zoom: 8, });
JavaScript
const map = new google.maps.Map(document.getElementById("map"), { center: { lat: -34.397, lng: 150.644 }, zoom: 8, });
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; }
HTML
<!DOCTYPE html> <html> <head> <title>Synchronous Loading</title> <script src="https://polyfill.io/v3/polyfill.min.js?features=default"></script> <link rel="stylesheet" type="text/css" href="./style.css" /> </head> <body> <div id="map"></div> <script src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&v=weekly"></script> <script src="./index.js"></script> </body> </html>
All
<!DOCTYPE html> <html> <head> <title>Synchronous Loading</title> <script src="https://polyfill.io/v3/polyfill.min.js?features=default"></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> </head> <body> <div id="map"></div> <script src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&v=weekly"></script> <script> const map = new google.maps.Map(document.getElementById("map"), { center: { lat: -34.397, lng: 150.644 }, zoom: 8, }); </script> </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 map-sync DESTINATION_FOLDER
Run in Google Cloud Shell
Google Cloud Shell is an interactive shell environment for Google Cloud Platform that makes it easy for you to learn and experiment with GCP and manage your projects and resources from your web browser.
Run in Cloud Shell