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Professional JavaScript for Web Developers - Fourth Edition

You're reading from  Professional JavaScript for Web Developers - Fourth Edition

Product type Book
Published in Nov 2019
Publisher Wiley
ISBN-13 9781119366447
Pages 1144 pages
Edition 4th Edition
Languages
Concepts
Author (1):
Matt Frisbie Matt Frisbie
Profile icon Matt Frisbie
LinkedIn
Matt Frisbie has worked in web development for over a decade. During that time, he's been a startup co-founder, an engineer at a Big Four tech company, and the first engineer at a Y Combinator startup that would eventually become a billion-dollar company. As a Google software engineer, Matt worked on both the AdSense and Accelerated Mobile Pages (AMP) platforms; his code contributions run on most of the planet's web browsing devices. Prior to this, Matt was the first engineer at DoorDash, where he helped lay the foundation for a company that has become the leader in online food delivery. Matt has written two books and recorded two video series for O'Reilly and Packt, speaks at frontend meetups and web casts, and is a level 1 sommelier. He majored in Computer Engineering at the University of Illinois Urbana-Champaign. Matt's Twitter handle is @mattfriz.
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Table of Contents (37) Chapters

COVER
FOREWORD
INTRODUCTION 1 What Is JavaScript? 2 JavaScript in HTML 3 Language Basics 4 Variables, Scope, and Memory 5 Basic Reference Types 6 Collection Reference Types 7 Iterators and Generators 8 Objects, Classes, and Object-Oriented Programming 9 Proxies and Reflect 10 Functions 11 Promises and Async Functions 12 The Browser Object Model 13 Client Detection 14 The Document Object Model 15 DOM Extensions 16 DOM Levels 2 and 3 17 Events 18 Animation and Graphics with Canvas 19 Scripting Forms 20 JavaScript APIs 21 Error Handling and Debugging 22 XML in JavaScript 23 JSON 24 Network Requests and Remote Resources 25 Client-Side Storage 26 Modules 27 Workers 28 Best Practices A ES2018 and ES2019 B Strict Mode C JavaScript Libraries and Frameworks D JavaScript Tools INDEX
END USER LICENSE AGREEMENT

PAGE VISIBILITY API

A major pain point for web developers is knowing when users are actually interacting with the page. If a page is minimized or hidden behind another tab, it may not make sense to continue functionality such as polling the server for updates or performing animations. The Page Visibility API aims to give developers information about whether or not the page is visible to the user.

The API itself is very simple, consisting of three parts:

  • document.visibilityState—A value indicating one of four states:
    • The page is in a background tab or the browser is minimized.
    • The page is in the foreground tab.
    • The actual page is hidden, but a preview of the page is visible (such as in Windows 7 when moving the mouse over an icon in the taskbar shows a preview).
    • The page is being prerendered off-screen.
  • visibilitychange event—This event fires when a document changes from hidden to visible, or vice versa.
  • document.hidden—A Boolean value indicating if the page is hidden...
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Authors (1)

Profile icon Matt Frisbie
LinkedIn
Matt Frisbie has worked in web development for over a decade. During that time, he's been a startup co-founder, an engineer at a Big Four tech company, and the first engineer at a Y Combinator startup that would eventually become a billion-dollar company. As a Google software engineer, Matt worked on both the AdSense and Accelerated Mobile Pages (AMP) platforms; his code contributions run on most of the planet's web browsing devices. Prior to this, Matt was the first engineer at DoorDash, where he helped lay the foundation for a company that has become the leader in online food delivery. Matt has written two books and recorded two video series for O'Reilly and Packt, speaks at frontend meetups and web casts, and is a level 1 sommelier. He majored in Computer Engineering at the University of Illinois Urbana-Champaign. Matt's Twitter handle is @mattfriz.
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See other products by Matt Frisbie

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