Google Maps Integration using JavaScript


By Faraz -

Learn how to integrate Google Maps seamlessly into your web application using JavaScript and the Google Maps API. A step-by-step guide for developers.

Google Maps Integration using JavaScript.jpg

Google Maps is an invaluable tool for web developers. It provides a dynamic and interactive way to display location-based information. In this guide, we'll delve into the process of integrating Google Maps into your web application. Whether you're looking to create an interactive map for your website, build a store locator, or enhance user experience with location-based services, you're in the right place. We'll take you step by step through the process of harnessing the power of JavaScript and the Google Maps API to create compelling map integrations that will captivate your audience and elevate your web development projects. Let's get started on this journey of mastering Google Maps integration.

Source Code

Step 1 (HTML Code):

To get started, we will first need to create a basic HTML file. In this file, we will include the main structure for our maps.

After creating the files just paste the following codes into your file. Make sure to save your HTML document with a .html extension, so that it can be properly viewed in a web browser.

Let's break down what each part of the code does:

1. <!DOCTYPE html>: This declaration defines the document type and version of HTML being used, which is HTML5 in this case.

2. <html lang="en">: This opening tag marks the beginning of the HTML document. The lang attribute is set to "en" to specify that the document is written in English.

3. <head>: This section contains meta-information about the webpage and links to external resources like stylesheets and scripts. It does not display any visible content on the webpage.

  • <meta charset="UTF-8">: This meta tag defines the character encoding of the document as UTF-8, which is a widely used character encoding for web content.
  • <meta name="viewport" content="width=device-width, initial-scale=1.0">: This meta tag sets the viewport properties for responsive design. It ensures that the webpage adapts to the width of the device and sets the initial zoom level to 1.0.
  • <meta http-equiv="X-UA-Compatible" content="ie=edge">: This meta tag is used to specify how Internet Explorer should render the webpage. It's often set to "ie=edge" for better compatibility with modern browsers.
  • <title>My Google Map</title>: This tag sets the title of the webpage, which appears in the browser's title bar or tab.
  • <link rel="stylesheet" href="styles.css">: This tag links an external CSS (Cascading Style Sheet) file named "styles.css" to the webpage. It's used to apply styles to the page's content.

4. <body>: This section contains the visible content of the webpage.

  • <h1>My Google Map</h1>: This is a level 1 heading that displays the text "My Google Map" as the main heading of the webpage.
  • <div id="map"></div>: This is a div element with an id attribute set to "map." It will be used to embed the Google Map later.
  • <script src="script.js"></script>: This tag links an external JavaScript file named "script.js" to the webpage. It's used to include custom JavaScript code.
  • `<script async defer
  • src="https://maps.googleapis.com/maps/api/js?key=YOUR API KEY&callback=initMap&libraries=&v=weekly"
  • async></script>: This script tag loads the Google Maps JavaScript API asynchronously. It includes the API key (replace "YOUR API KEY" with an actual API key), specifies a callback function named "initMap," and uses the "weekly" version of the API. The asyncanddefer` attributes ensure that the script is loaded and executed asynchronously to prevent blocking the page's rendering.

This is the basic structure of our maps using HTML, and now we can move on to styling it using CSS.

Step 2 (CSS Code):

Next, we need to style our Google Maps by adding our CSS. Let's break down what each part of the code does:

1. #map: This is a CSS selector that targets an HTML element with the ID "map." In HTML, you can assign IDs to elements to uniquely identify them. In this case, there is an HTML <div> element with the id attribute set to "map."

2. {: This opening curly brace indicates the start of a CSS rule. All the CSS properties and values inside this rule will be applied to the HTML element with the ID "map."

3. height: 400px;: This CSS property and value set the height of the "map" element to 400 pixels. This means that the element will have a vertical height of 400 pixels on the web page.

4. width: 100%;: This CSS property and value set the width of the "map" element to 100% of its containing parent element's width. Using "100%" for the width makes the "map" element expand to fill the entire horizontal space of its container.

5. }: This closing curly brace marks the end of the CSS rule. All the styles specified within this rule apply to the HTML element with the ID "map" and nothing else.

Create a CSS file with the name of styles.css and paste the given codes into your CSS file. Remember that you must create a file with the .css extension.


Step 3 (JavaScript Code):

Finally, we need to create a function in JavaScript. Here's an explanation of the code:

1. function initMap(): This is a JavaScript function that serves as an initialization function for creating and configuring a Google Map. It will be called when the page loads.

2. var options: An object that contains configuration options for the map. It includes:

  • zoom: Sets the initial zoom level of the map to 8.
  • center: Specifies the initial center coordinates of the map, which are latitude 19.0760 and longitude 72.8777 (these coordinates correspond to a location, Mumbai).

3. var map = new google.maps.Map(document.getElementById('map'), options);: This line creates a new Google Map instance and associates it with an HTML element with the ID 'map'. It uses the options object to configure the map's initial properties, such as zoom level and center.

4. google.maps.event.addListener(map, 'click', function(event) {...});: This code adds an event listener to the map. It listens for a click event on the map and executes the provided function when a click occurs. Inside the function, it calls the addMarker function with the clicked event's latitude and longitude.

5. var markers: An array of marker objects. Each marker object represents a point on the map and have properties like coordinates (coords), an icon image (iconImage), and content (content).

6. A for loop iterates through the markers array and calls the addMarker function for each marker, effectively adding them to the map.

7. function addMarker(props) { ... }: This is a function for adding markers to the map. It takes an object props as an argument, which contains information about the marker to be added.

  • Inside the function, a new google.maps.Marker object is created, positioned at props.coords, and associated with the map.
  • It checks if there is a custom icon specified (props.iconImage) for the marker. If an icon image is provided, it sets the marker's icon to that image.
  • It also checks if there is content (props.content) associated with the marker. If content is provided, it creates an info window with that content and associates it with the marker. When the marker is clicked, the info window will open on the map at the marker's location.

Create a JavaScript file with the name script.js and paste the given codes into your JavaScript file and make sure it's linked properly to your HTML document so that the scripts are executed on the page. Remember, you’ve to create a file with .js extension.

function initMap(){
  // Map options
  var options = {
    center:{lat: 19.0760, lng: 72.8777}

  // New map
  var map = new google.maps.Map(document.getElementById('map'), options);
  // Listen for click on map
  google.maps.event.addListener(map, 'click', function(event){
    // Add marker
  // Array of markers
  var markers = [
      coords:{lat: 19.0760, lng: 72.8777},


' }, { coords:{lat: 19.0760, lng: 72.8777} } ]; // Loop through markers for(var i = 0;i < markers.length;i++){ // Add marker addMarker(markers[i]); } // Add Marker Function function addMarker(props){ var marker = new google.maps.Marker({ position:props.coords, map:map, //icon:props.iconImage }); // Check for customicon if(props.iconImage){ // Set icon image marker.setIcon(props.iconImage); } // Check content if(props.content){ var infoWindow = new google.maps.InfoWindow({ content:props.content }); marker.addListener('click', function(){ infoWindow.open(map, marker); }); } } }

Final Output:

Google Maps Integration using JavaScript.gif


In this comprehensive guide, we've embarked on a journey to master Google Maps integration using JavaScript and the Google Maps API. We've covered everything from the basics of obtaining an API key to customizing maps, adding interactivity, and even creating advanced features like store locators and location-based services.

As you continue to explore the world of web development, remember that Google Maps can be a powerful asset to engage and delight your users. With the knowledge you've gained here, you have the tools to create visually stunning and highly functional maps that can enhance the user experience of your web applications.

The future of Google Maps integration is bright, with new features and possibilities emerging regularly. Stay updated with Google's documentation and best practices to keep your maps up to date and optimized for the latest web technologies.

Now, armed with this expertise, go ahead and create amazing map integrations that will not only inform but also inspire your users. Whether you're guiding them to your physical store locations, helping them discover nearby points of interest, or simply providing visual context to your data, Google Maps is your reliable companion on this journey. Happy mapping!

That’s a wrap!

I hope you enjoyed this post. Now, with these examples, you can create your own amazing page.

Did you like it? Let me know in the comments below 🔥 and you can support me by buying me a coffee.

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Faraz 😊

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