Web apps would run much better if heavy calculations could be performed in the background, rather than compete with the user interface. With this book, you’ll learn how to use Web Workers to run computationally intensive JavaScript code in a thread parallel to the UI. Yes, multi-threaded programing is complicated, but Web Workers provide a simple API that helps you be productive without the complex algorithms. If you have an intermediate to advanced understanding of JavaScript—especially event handling and callbacks—you’re ready to tackle Web Workers with the tools in this example-driven guide. Start creating Web Workers and understand what they can and can’t do Determine which browser versions support the API Use dedicated Web Workers for tasks that consume a lot of CPU, such as data parsing Explore use cases for creating inline Workers, such as encapsulating a web app in one page Create a shared Worker to communicate multiple web app instances to the server, and other uses Learn best practices for debugging Web Workers Apply Web Workers within the server-side Node environment
The HTML5 Programmer’s Reference aims to provide everything a programmer needs for understanding and using the new HTML5 family of standards. Previous HTML standards were focused on defining tags for marking up documents. The HTML5 family of standards not only includes new semantic tags but also defines exciting new JavaScript APIs that can be used to build rich, interactive web applications for both mobile and desktop platforms. The HTML5 Programmer’s Reference focuses on providing real-world non-trivial examples to demonstrate concepts. Chapters include both in-depth discussions and full references for all HTML5 features, as well as extras like how to find the standards, the history of their evolution, and other examples and helpful resources. With this book the reader will learn everything they need to know to build the next generation of web applications.
Use the latest version of HTML to create dynamic Web pages HTML5 is the latest iteration of the standard markup language for creating Web pages. It boasts extensive updates from its predecessor and allows you to incorporate rich media content into a site without any dependence on extra software such as Flash. Packed with hundreds of screen shots, this visual guide introduces you to the many new features and abilities of HTML5 and shows you the many exciting new possibilities that exist for designing dynamic Web pages. Offers visual learners a solid reference on HTML5, the latest version of the standard markup language for designing Web pages Demonstrates how to use HTML5 to create Web pages that feature the latest in rich media content Provides easy-to-understand examples that cover a variety of topics to get you up and running with HTML5 Features a companion Web site that contains all the code needed to learn HTML5 HTML5: Your visual blueprint for designing effective Web pages opens your eyes to the world of possibilities that exist with the new version of the popular markup language. Adam R. McDaniel is a Web developer, technical architect, and security analyst, who has contributed to the Linux Kernel.
Performance is critical to the success of any web site, and yet today's web applications push browsers to their limits with increasing amounts of rich content and heavy use of Ajax. In this book, Steve Souders, web performance evangelist at Google and former Chief Performance Yahoo!, provides valuable techniques to help you optimize your site's performance. Souders' previous book, the bestselling High Performance Web Sites, shocked the web development world by revealing that 80% of the time it takes for a web page to load is on the client side. In Even Faster Web Sites, Souders and eight expert contributors provide best practices and pragmatic advice for improving your site's performance in three critical categories: JavaScript—Get advice for understanding Ajax performance, writing efficient JavaScript, creating responsive applications, loading scripts without blocking other components, and more. Network—Learn to share resources across multiple domains, reduce image size without loss of quality, and use chunked encoding to render pages faster. Browser—Discover alternatives to iframes, how to simplify CSS selectors, and other techniques. Speed is essential for today's rich media web sites and Web 2.0 applications. With this book, you'll learn how to shave precious seconds off your sites' load times and make them respond even faster. This book contains six guest chapters contributed by Dion Almaer, Doug Crockford, Ben Galbraith, Tony Gentilcore, Dylan Schiemann, Stoyan Stefanov, Nicole Sullivan, and Nicholas C. Zakas.
HTML5 is here, and with it, web applications take on a power, ease, scalability, and responsiveness like never before. In this book, developers will learn how to use the latest cutting-edge HTML5 web technology—available in the most recent versions of modern browsers—to build web applications with unparalleled functionality, speed, and responsiveness. Explains how to create real-time HTML5 applications that tap the full potential of modern browsers Provides practical, real-world examples of HTML5 features in action Shows which HTML5 features are supported in current browsers Covers all the new HTML5 APIs to get you up to speed quickly with HTML5
Build better software with concurrent JavaScript programming, and unlock a more efficient and forward thinking approach to web development About This Book Apply the core principles of concurrency to both browser and server side development Explore the latest tools and techniques at the forefront of concurrent programming, including JavaScript promises, web workers, and generators Learn how concurrent and parallel programming can help you tackle the challenges of fast, data heavy web development Who This Book Is For JavaScript Concurrency is written for any JavaScript developer who wants to learn how to write more efficient, powerful, and maintainable applications that utilize the latest developments in the JavaScript language. All aspects of concurrent, asynchronous, and parallel programming are covered from first principles and by the end of the book you'll be able to create a fully-worked application that leverages all the topics covered in the book. What You Will Learn Understand exactly how JavaScript works in a web browser environment, and how these mechanisms power our event-driven JavaScript code Use promises to turn complex synchronization scenarios into readable and maintainable values Compute values lazily and avoid unnecessary memory allocations using generators. Write concurrent code that doesn't feel like concurrent code by abstracting away boilerplate chores Leverage true hardware parallelism with web workers to get a better performance Get to grips with the NodeJS model of concurrency and learn why it's good for I/O-intensive web applications In Detail Concurrent programming may sound abstract and complex, but it helps to deliver a better user experience. With single threaded JavaScript, applications lack dynamism. This means that when JavaScript code is running, nothing else can happen. The DOM can't update, which means the UI freezes. In a world where users expect speed and responsiveness – in all senses of the word – this is something no developer can afford. Fortunately, JavaScript has evolved to adopt concurrent capabilities – one of the reasons why it is still at the forefront of modern web development. This book helps you dive into concurrent JavaScript, and demonstrates how to apply its core principles and key techniques and tools to a range of complex development challenges. Built around the three core principles of concurrency – parallelism, synchronization, and conservation – you'll learn everything you need to unlock a more efficient and dynamic JavaScript, to lay the foundations of even better user experiences. Throughout the book you'll learn how to put these principles into action by using a range of development approaches. Covering everything from JavaScript promises, web workers, generators and functional programming techniques, everything you learn will have a real impact on the performance of your applications. You'll also learn how to move between client and server, for a more frictionless and fully realized approach to development. With further guidance on concurrent programming with Node.js, JavaScript Concurrency is committed to making you a better web developer. The best developers know that great design is about more than the UI – with concurrency, you can be confident every your project will be expertly designed to guarantee its dynamism and power. Style and approach Beginning with the fundamentals of concurrency and how they apply to JavaScript development, the book then takes you through the relevant constructs that will help you implement concurrent code. You'll learn how even the most abstract and theoretical aspects of concurrent programming help you solve real world challenges, with clear and practical demonstrations that show you how concurrent JavaScript will make you a better developer.
This book constitutes the thoroughly refereed post-conference proceedings of the Second International Conference on Mobile Computing, Applications, and Services (MobiCASE 2010) held in Santa Clara, CA, USA, during October 25-28, 2010. The 15 revised full papers presented were carefully selected from numerous submissions. Conference papers are organized in six technical sessions, covering the topics of mobile Web and mash-ups, software engineering and development tools, cross-layer approaches, location-based services, mobile healthcare, and mobile social networking. Furthermore the volume includes two workshops on mobile computing and mobile security as well as four poster papers.
2012 Jolt Productivity Award winner! Using HTML5, web developers can create standards-based browser applications with extraordinary richness and power, incorporating everything from drag-and-drop to native audio and video–all without any third-party plug-ins. Simply put, every web developer needs to master HTML5–and the sooner you do so, the greater advantage you’ll have. HTML5 Developer’s Cookbook provides all the expert advice and proven code you need to start building production-quality HTML5 applications right now. Authors Chuck Hudson and Tom Leadbetter present tested, modular recipes at beginner, intermediate, and advanced levels. You’ll learn exactly how to deliver state-of-the-art user experiences by integrating HTML5’s new and enhanced elements with CSS3, multimedia, and JavaScript APIs. Reflecting current standards, this book prioritizes HTML5 features with substantial browser support and identifies the level of browser support for each feature discussed. Coverage includes Understanding and using HTML5’s new structural elements Using grouping, text-level, and redefined semantics Managing browser-handling in HTML5 Leveraging new CSS3 layout and style techniques Maximizing interactivity with HTML5 Web Forms Embedding audio and video with HTML5 Drawing with the canvas Controlling browser histories Integrating location awareness with the Geolocation API Implementing client side storage Working with local files Managing communication and threading Optimizing the HTML5 browser experience Integrating device data Turn to HTML5 Developer’s Cookbook for expert answers, real solutions, and the code required to implement them. It’s all you need to jumpstart any HTML5 project and create rich, high-value web applications your users will love.
