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Accelerated DOM Scripting with Ajax, APIs and Libraries (Inglese) Copertina flessibile – 26 set 2007

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Descrizione prodotto


Aaron Gustafson pushed pixels and bits as a freelancer for many top companies (Aetna, Deloitte & Touche, Delta Airlines, Guinness, IBM and Scholastic, to name a few) before taking a position at Cronin and Company, a regional advertising agency. At Cronin, Aaron got the digital department off the ground and set the standards (pun intended) for all web development within the agency. His work on websites for Bertucci's, Konica Minolta, Mystic Aquarium, TriZetto and several Connecticut state agencies garnered numerous state, national and international awards for Cronin, for both design and web standards. In early 2006, Aaron left Cronin to focus on building his own web shop (Easy! Designs, LLC) and writing more. In addition to being a member of the Web Standards Project (WaSP), Aaron sits on the advisory panel for WOW (formerly World Organization of Webmasters) and is a member of the Guild of Accessible Web Designers (GAWDS). He serves as production editor for A List Apart, is a contributing writer for Digital Web Magazine, and contributed several chapters to the newly-updated Web Design in a Nutshell, Third Edition (O'Reilly). Aaron has been a featured speaker at numerous conferences, including COMDEX, MacWorld and SXSW, and has been called on to provide web standards training in both government and corporations. He blogs at easy-reader.net.

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Amazon.com: 5.0 su 5 stelle 4 recensioni
3 di 3 persone hanno trovato utile la seguente recensione
5.0 su 5 stelle Excellent and concise 12 agosto 2009
Di Zenlang - Pubblicato su Amazon.com
Formato: Copertina flessibile Acquisto verificato
Book with high density ..... unlike most books which tend to be an excercise in verbosity.
8 di 8 persone hanno trovato utile la seguente recensione
5.0 su 5 stelle Accelerated Learning 28 giugno 2008
Di Nathan Smith - Pubblicato su Amazon.com
Formato: Copertina flessibile
Accelerated DOM Scripting with Ajax, APIs, and Libraries - despite its lengthy title, is a succinct glimpse into the world of JavaScript programming. Primarily written by developer extraordinaire Jonathan Snook, this book also includes contributions from a veritable who's-who of the JS world: Aaron Gustafson, Stuart Langridge, and Dan Webb. They cover a myriad of topics, including object oriented programming, DOM traversal, and popular libraries:

* Dojo
* Ext
* jQuery
* Mootools
* Prototype
* Scriptaculous

The book starts off at a reasonable pace, explaining a brief history of how JavaScript came to be, debunking some of the myths around its viability, and showing some of the differences in implementation between HTML and XHTML. Namely, the use of CDATA for inline scripts. Snook also clarifies the meaning of Ajax, which originally stood for "Asynchronous JavaScript and XML," but has since come to encompass any asynchronous browser - server interaction.

Another topic covered by Snook is that of code maintainability and debugging. While JavaScript comprises one-third of the "holy trinity" (HTML, CSS, JS) of web development, the W3C only offers validation services for the first two. As one transitions from a code savvy designer who can do HTML and CSS, it can be somewhat confusing, left to one's own devices to learn JS.

Luckily, there are plenty of tools available, but one has to look beyond the W3C to find them. Such helpful allies are the Firebug and Web Developer extensions for Firefox, and JSLint - an irreplaceable JS code verifier that offers a variety of strictness and integrity settings. Snook explains how to use these to your advantage, using console.log to catch errors in Firebug, and writing well structured code that passes minification and obfuscation.

Snook explains the importance of taking a wholistic approach to web development, treating HTML and CSS with due respect, ensuring semantics in markup and steering clear of using JS presentational purposes that would be better handled in a stylesheet. He also explains the concepts of nodes as they appear in a page by showing them in a tree structured chart. For instance, a tag is a node, but so is the sum total of the text inside it. As a general rule of thumb, all tags are nodes, but so are their non-tag contents. This is important to remember when attempting to manipulate the DOM via cloneNode.

Another tricky concept, which is handled differently depending on the browser, is event bubbling. Despite the name, this has nothing to do with socializing and everything to do with the way actions are triggered in a browser. Snook explains how this can be used to one's advantage, by assigning an event listener to a containing element, such as a UL, and when it is clicked, checking if the click originated from a particular child element, such as a link within a LI with a certain class. Now you are cooking with fire, because you can build out complex menu systems.

After laying a solid foundation of teaching the fundamentals, the book moves on to the juicier parts - using libraries. Snook cautions against jumping straight into using a library without understanding the nuances of what is happening "under the hood," because if you ever need to debug at a core level, you're stuck.

That being said, in chapter 5 he shows how to do some complex data exchange, mimicking a desktop environment, mentioning how this could be enhanced by Prototype, YUI or jQuery. Chapter 6 is all about doing the really cool stuff - adding visual motion to your pages. Snook shows how to achieve identical tweening effects with Scriptcaculous, jQuery and Mootools.

In chapter 7, Stuart Langridge takes the helm, and explains how to write your own custom form validation. Let me just say from experience that this is typically the best way to go, because the business requirements around what constitutes a valid form entry can often get pretty hairy. For me, it is usually easier to write this by hand, with the help of a library, rather than try to find a one size fits all plugin. Langridge shows how to do this on both the server side, via PHP as well as in the browser using JS. It should be noted that whether or not you're doing client-side validation, server-side is a must-have (JS can be switched off, PHP can't).

In chapter 8, Aaron Gustafson shows how to build an incredibly slick FAQ page, using JS to create an accordion style menu system. He does it in such a way that if JS is unavailable, the it reverts back to a standard page. This notion of adding functionality is called progressive enhancement whereas orchestrating an acceptably elegant fall-back scenario is termed graceful degradation.

For those familiar with Ruby on Rails, chapter 9 is for you. Dan Webb goes step by step, showing how to build a dynamic Ajax drive help system. He uses Prototype for some of the heavy lifting of data processing, and his own custom extensions dubbed Low Pro to assist in making his code unobtrusive. With the core functionality in place, he uses Moo.fx to add in animations.

Aside: The aforementioned Mootools is a full library which had its origins in Moo.fx. Mootools and Prototype both include core DOM functions, and can be considered mutually exclusive. However, if you want the animation style and syntax of Mootools, and area already using the base of Prototype, Moo.fx is a nice add-on. Likewise, Moo.fx and Scriptaculous are mutually exclusive.

Well, that wraps up my review. Hopefully it has encouraged you to dig in further to this well written book. The people involved definitely know their stuff, and the topics covered are highly relevant to the fast pace of web development today.
13 di 15 persone hanno trovato utile la seguente recensione
5.0 su 5 stelle Excellent JavaScript resource to help you dive into libraries and their APIs 23 ottobre 2007
Di Nate Klaiber - Pubblicato su Amazon.com
Formato: Copertina flessibile
Accelerated DOM Scripting, Ajax, APIs, and Libraries by Jonathan Snook, Aaron Gustafson, Stuart Langridge, and Dan Webb is not just another book on DOM scripting. There are many excellent DOM scripting and JavaScript books available to us as developers. Some are thorough explanations of JavaScript with a little bit about the DOM, while others are full blown books on the subject of DOM scripting. This book takes a slightly different direction discussing DOM scripting in light of Ajax, the array of APIs available, and the many libraries available that help us rapidly develop our applications. Upon hearing of the arrival of this book, I was worried that it might be something that would be considered obsolete the week after it was published due to the rapid rate of change in libraries and APIs. After reading this book, that worry was put to rest as each of the authors did an excellent job of digging into the guts of the libraries, exposing how things are done, how you could do it yourself, and how a library could be of assistance to you.

Chapter 1 starts us off with an explanation of the state of JavaScript. JavaScript has been abused heavily in the past, and due to this abuse and its inconsistencies - many developers chose to shy away. However, this is no longer the case. Along with explaining the state of JavaScript, we get to look at ways to manage our JavaScript code as well as debug our code. This gives us the tools we need as we begin development throughout the rest of the chapters.

Chapter 2 dives into HTML, CSS, and JavaScript. Often referred to as the trinity of front-end development, it is valuable for you to understand the purpose of each, and how they interact with one another. The basics of each are discussed, and then we move to the DOM and find out how we can use semantic markup and meaningful CSS to create the necessary hooks for our JavaScript to interact. Topics such as traversing, reading, and writing to the DOM, handling attributes, detecting browser support, and handling events are all discussed. This chapter builds from previous chapter, and prepares us as we move on to the following chapters.

Chapter 3 tackles the sometimes tough subject of object oriented programming. Depending on your background and experience in programming, the idea of OOP may seem foreign to you. However, the author does an incredible job of highlighting the benefits, formatting, and examples throughout the entire chapter. Some of the benefits discussed are: Namespaces, closures, and encapsulation. To me, this chapter was one of the most valuable in the entire book as it helps you to understand the programming at the core of the libraries that are discussed. Knowing what is going on under the hood is extremely important as you develop and troubleshoot your code.

Chapter 4 moves us to the discussion of the available libraries. As I stated earlier, I was concerned that this book would quickly become stale due to the change and development of libraries. I couldn't have been more wrong. This chapter doesn't just show you the libraries and move on. This chapter teaches you how the libraries work, how you can develop within the libraries, and explains the benefits of using libraries. It teaches you what takes place under the hood for so many different aspects. Along with teaching these things, the author gives you some tips as you are searching and selecting a JavaScript library to work with, something invaluable as there are many options to choose from.

Chapter 5 moves into the world of Ajax and Data Exchange. This chapter discusses all of the nuances of Ajax. These are the important things that need to be addressed before you start implementing Ajax in your applications. Understanding the data formats that are returned. Understanding the HTTP codes. Understanding the different ActiveX Objects. Understanding how to prepare for and handle failure. All of these things are very important as you use Ajax. After you learn what is going on under the hood and how to put the pieces together, the author shows you how libraries can help you in the process.

Chapter 6 discusses Animation, what most people think of when they hear Ajax. As with the previous chapter, you start off by building a simple animation object, then look to see what the libraries have to offer.

Chapter 7 takes us into form validation with JavaScript. All validation should first take place on the server side, then use the client-side to enhance the user experience. The tricky part comes when you find yourself maintaining two validation codebases, one in a server-side language and one in JavaScript. This chapter brings both of these worlds together and allows you to specify your validation rules in one place, sharing your server-side code with the client-side. This makes the validation process much easier and expandable. If you ever want to add or remove validation rules, you can do it in one spot and both the server-side and client-side will follow suit. As with the previous chapters, we first build our example from scratch so we understand the core, then we see how libraries can help us in the process.

Chapter 8 is a case study in building a FAQ system. This chapter walks through the process of creating a usable, accessible, and progressively enhanced FAQ system. This case study builds the semantic HTML, the necessary CSS hooks, and uses the necessary JavaScript to achieve our tasks. The process is extremely thorough as each and every piece is tackled and dissected in the building process. This case study is an excellent tutorial in using all of the building blocks we have discussed up to this point.

Chapter 9 is another case study that walks us through the process of building a dynamic help system. This current example utilizes the Ruby on Rails framework to build the application. The first part of this case study spends important time in planning and preparation. This is important in any application that uses progressive enhancement. As the author points out, this chapter starts with a solid base of semantic HTML, and then builds the CSS and JavaScript on top where necessary. The planning is in place, the foundation is established, and the hooks are in place. As with the previous case study, this chapter does an excellent job of diving in and showing you all of the little details necessary to put an application together.

This book went beyond my initial expectations. It is geared more towards someone who already has a good understanding of HTML, CSS, and JavaScript. If you are looking for a book to teach you JavaScript, then this is not it. This book will help you take your understanding of JavaScript to the next level, and help you grasp what is going on at the core of your library of choice. This is especially important when you have to troubleshoot a piece of JavaScript, or you have to extend something to fit your needs. This book doesn't simply leave you with an explanation of libraries, but teaches you where libraries are helpful, and how you can fully understand what the libraries have to offer. JavaScript is not evil. JavaScript libraries are not evil. This book will show you how to make proper use of the tools available to you.
5.0 su 5 stelle Five Stars 11 ottobre 2015
Di Edwin - Pubblicato su Amazon.com
Formato: Copertina flessibile Acquisto verificato
Excellent book.