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This book provides a developer-level introduction along with more advanced and useful features of JavaScript. Coverage includes: * JavaScript use with HTML to create dynamic webpages, language concepts including syntax and flow control statements * variable handling given their loosely typed nature * built-in reference types such as object and array * object-oriented programing * powerful aspects of function expressions * Browser Object Model allowing interaction with the browser itself * detecting the client and its capabilities * Document Object Model (DOM) objects available in DOM Level 1 * how DOM Levels 2 and 3 augmented the DOM * events, legacy support, and how the DOM redefined how events should work * enhancing form interactions and working around browser limitations * using the tag to create on-the-fly graphics * JavaScript API changes in HTML5 * how browsers handle JavaScript errors and error handling * features of JavaScript used to read and manipulate XML data * the JSON data format as an alternative to XML * Ajax techniques including the use of XMLHttpRequest object and CORS * complex patterns including function currying, partial function application, and dynamic functions * offline detection and storing data on the client machine * techniques for JavaScript in an enterprise environment for better maintainability This book is aimed at three groups of readers: Experienced object-oriented programming developers looking to learn JavaScript as it relates to traditional OO languages such as Java and C++; Web application developers attempting to enhance site usability; novice JavaScript developers. Nicholas C. Zakas worked with the Web for over a decade. He has worked on corporate intranet applications used by some of the largest companies in the world and large-scale consumer websites such as MyYahoo! and the Yahoo! homepage. He regularly gives talks at companies and conferences regarding front-end best practices and new technology.

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Get up to date on the latest ways to use JavaScript in web development

If you want to achieve JavaScript's full potential, it is critical to understand its nature, history, and limitations. To that end, this updated version of the bestseller by veteran author and JavaScript guru Nicholas C. Zakas covers JavaScript from its very beginning to the present-day incarnations including the DOM, Ajax, and HTML5. Zakas shows you how to extend this powerful language to meet specific needs and create dynamic user interfaces for the web that blur the line between desktop and internet. By the end of the book, you'll have a strong understanding of the significant advances in web development as they relate to JavaScript so that you can apply them to your next website.

Professional JavaScript for Web Developers:

• Offers a detailed discussion of the components that make up a JavaScript implementation

• Zeroes in on new and emerging APIs such as the Selectors API, Web Workers, and Cross-Document Messaging

• Explores object-oriented programming in JavaScript

• Shows how to implement drag and drop file upload with Ajax and the File API

• Highlights the new core language features introduced in ECMAScript5

• Explains how to work with data formats such as XML and JSON

• Looks at what's coming in ECMAScript Harmony

• Walks you through creating offline-capable web applications

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Wrox Professional guides are written by working developers to address everyday needs. They provide examples, practical solutions, and expert education in new technologies, all designed to help programmers do a better job.