JavaScript in the Background

• Understanding JavaScript Execution in the Background: Learn how JavaScript behaves when a web app is in the background, including techniques to detect when users leave or close the app.
• Implementing Background APIs: Gain skills in using background-specific APIs like the Service Worker Background APIs, Page Visibility API, and Web Push API to enhance user experience.
• Enhancing User Experience: Understand how to update users, save and restore app state, and manage pending operations effectively.
• Real-Time Push Notifications: Use the Web Push API to enable real-time push notifications, allowing users to stay informed even when not actively using the app.

This course explores how JavaScript operates when web applications run in the background and presents methods to detect changes in app visibility and state. You'll learn to implement modern web APIs to improve user interaction, manage resources efficiently, and utilize push notifications for real-time updates. Designed to enhance progressive web applications, this course covers both desktop and mobile environments, demonstrating how background processes differ across platforms.

• Frontend developers looking to deepen their understanding of background JavaScript execution.
• Web developers interested in building or enhancing progressive web applications.
• Professionals seeking to improve web app user experience through advanced browser APIs.
• Developers wanting to implement real-time push notifications in their applications.

• Basic understanding of JavaScript and web development.
• Familiarity with frontend development concepts and browser APIs.
• Experience with HTML and CSS.

Web App Lifecycle

• Explore how web apps operate in the background on mobile and desktop platforms.
• Differences in resource management between platforms.

Observing Background JavaScript

• Examine how different browsers handle background processes.
• Techniques to manage timers and web workers effectively.

Service Worker Background APIs

• Learn about various Service Worker APIs such as Web Push, Background Sync, and Background Fetch.
• Implement features to run code and handle network requests in the background.

Visibility and State Detection

• Use the Page Visibility API to detect when apps are in the background.
• Implement methods to handle app state changes and restore sessions.

Push Notifications and Background Fetch

• Set up and manage push notifications to keep users informed.
• Understand the technicalities of the Web Push API and key generation for secure notifications.

Media Session and Picture in Picture APIs

• Explore use cases for media playing in the background.
• Implement Picture in Picture mode to enhance multimedia experiences.