Ruby on Railsframework~30 mins

Webpacker and JavaScript bundling in Ruby on Rails - Mini Project: Build & Apply

Choose your learning style9 modes available

Learn Why Deep Visual Try Challenge Project Recall Perf

Webpacker and JavaScript Bundling in Rails

📖 Scenario: You are building a simple Rails app that needs to include JavaScript code for interactive behavior. To manage and bundle your JavaScript files efficiently, you will use Webpacker, the default JavaScript bundler in Rails.This project will guide you step-by-step to set up Webpacker, add JavaScript files, and bundle them correctly so your Rails app can use them.

🎯 Goal: By the end, you will have a Rails app with Webpacker configured, a JavaScript pack file created, and your JavaScript code bundled and ready to use in your views.

📋 What You'll Learn

Create a JavaScript pack file named application.js inside app/javascript/packs

Add a simple JavaScript function inside application.js

Configure Webpacker to compile the JavaScript pack

Include the JavaScript pack tag in the Rails layout file to load the bundled JavaScript

💡 Why This Matters

🌍 Real World

Rails apps often need JavaScript for interactivity. Webpacker helps bundle and manage JavaScript files efficiently, making it easier to maintain and scale frontend code.

💼 Career

Understanding Webpacker and JavaScript bundling is essential for Rails developers to build modern web apps with clean, maintainable frontend code.

Progress0 / 4 steps

Create JavaScript pack file

Create a file named application.js inside app/javascript/packs folder. Inside it, write a JavaScript function called greet that logs the message 'Hello from Webpacker!' to the console.

Ruby on Rails

// Your code here
// Create function greet that logs 'Hello from Webpacker!'

Need a hint?

Use function greet() { ... } and inside it console.log('Hello from Webpacker!'). Then call greet() at the end.

Configure Webpacker to compile JavaScript

Ensure Webpacker is installed and configured in your Rails app. Add the line <%= javascript_pack_tag 'application' %> inside the <head> section of your app/views/layouts/application.html.erb file to load the JavaScript pack.

Ruby on Rails

function greet() {
  console.log('Hello from Webpacker!');
}

greet();

 inside  in application.html.erb -->

Need a hint?

Open app/views/layouts/application.html.erb and add <%= javascript_pack_tag 'application' %> inside the <head> tag.

Run Webpacker to bundle JavaScript

Run the command bin/webpack in your terminal to compile and bundle the JavaScript files using Webpacker.

Ruby on Rails

// Your code here
// Run bin/webpack in terminal to bundle JavaScript

Need a hint?

Open your terminal and run bin/webpack to compile the JavaScript pack.

Verify JavaScript is loaded in the browser

Open your Rails app in a browser and use the browser's developer console to verify that the message 'Hello from Webpacker!' appears, confirming the JavaScript bundle is loaded and running.

Ruby on Rails

Need a hint?

Open your browser's developer tools console to see the logged message from your JavaScript code.