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Bulletproof Ajax (Voices That Matter)
 
 
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Bulletproof Ajax (Voices That Matter) [ペーパーバック]

Jeremy Keith

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内容説明

Step-by-step guide reveals best practices for enhancing Web sites with Ajax

  • A step-by-step guide to enhancing Web sites with Ajax.
  • Uses progressive enhancement techniques to ensure graceful degradation (which makes sites usable in all browsers).
  • Shows readers how to write their own Ajax scripts instead of relying on third-party libraries.

Web site designers love the idea of Ajax--of creating Web pages in which information can be updated without refreshing the entire page. But for those who aren't hard-core programmers, enhancing pages using Ajax can be a challenge. Even more of a challenge is making sure those pages work for all users. In Bulletproof Ajax, author Jeremy Keith demonstrates how developers comfortable with CSS and (X)HTML can build Ajax functionality without frameworks, using the ideas of graceful degradation and progressive enhancement to ensure that the pages work for all users. Throughout this step-by-step guide, his emphasis is on best practices with an approach to building Ajax pages called Hijax, which improves flexibility and avoids worst-case scenarios.

著者について

Working with the Web consultancy firm, Clearleft, Jeremy Keith creates elegant, usable Web sites using the troika of Web standards: CSS, (X)HTML, and the Document Object Model. He is a member of the Web Standards Project and joint lead of the DOM Scripting Task Force. He teaches hands-on Ajax and DOM Scripting in full-day workshops and is the author of DOM Scripting: JavaScript Web Design with JavaScript and the Document Object Model.

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Amazon.com: 5つ星のうち 4.2  31 件のカスタマーレビュー
41 人中、41人の方が、「このレビューが参考になった」と投票しています。
5つ星のうち 4.0 A great first start to proper AJAX 2007/3/7
By Nate Klaiber - (Amazon.com)
形式:ペーパーバック|Amazon.co.jpで購入済み
Bulletproof AJAX by Jeremy Keith was an excellent beginners book to AJAX. For those who have read Bulletproof Web Design by Dan Cederholm, this book literally took the same approach. The book starts with the very basics and walks you to the end where you create a fictional bookstore that utilizes AJAX. Each chapter addresses what it means to make an AJAX application bulletproof. The author is brutally honest while informing you the barriers that AJAX faces, and how to get around them. Sometimes the best solution is: don't use AJAX. Obviously, this isn't the case for everything - or there wouldn't be a book to read. I appreciated the approach of making sure that your AJAX applications utilize progressive enhancement and are unobtrusive. These are two key elements when dealing with JavaScript as a whole. The entire journey of this brief (but informative) 200 page book looked a little like this:

Chapter 1 answers the question "What is AJAX?" and gives a brief introduction and history lesson as to it's origins. This is very basic, but begins to get your feet wet understanding that AJAX is not a new technology - but one that has recently hit the spotlight.

Chapter 2 gives a thorough overview of the Document Object Model. He explains what the DOM is, how it relates to your structured HTML and Javascript, and the methods associated with traversing the DOM. This is very important as he moves forward to create unobtrusive AJAX.

Chapter 3 dives into the XMLHttpRequest object, its origins, and how to create a bulletproof instance of the object. This handles the differences between IE and other browsers and how they implement the request. He creates a wrapper for use (and use through the rest of the book) that allows us to send requests, receive responses, and then position it accordingly in the DOM.

Chapter 4 covers the Data Formats that are returned by our request. These include XML, JSON, and HTML. He covers each data format, and creates another wrapper for retrieving the different data formats.

Chapter 5 introduces HIJAX. This is where he irons out some of his previous scripts. Initially inline scripts were used as examples, but with HIJAX we see how we can create bulletproof implementations of AJAX. Topics covered here include progressive enhancement, unobtrusive Javascript, and rich clients.

Chapter 6 forces us to hit a wall (briefly). This chapter discussed the challenges that AJAX faces (and has faced in the past). Some of the challenges revolve around web services and connecting to remote API's, making your application backwards compatible, how to work around browser inconsistencies and consistencies (The back button and bookmarking), and how to wireframe an application that will change in each section.

Chapter 7 discusses accessibility in relation to AJAX. One of the most frustrating parts for any application moving forward is dealing properly with screen readers. Screen readers are incredible tools, but since they sit on top of an existing browser it can make some things rather difficult (especially checking for the existence of Javascript).

Chapter 8 starts to wrap things up. Taking everything we have learned to this point, he discusses planning, applying, and bulletproofing your application.

Chapter 9, the final chapter, looks to the future of AJAX. Not only did it discuss the future - it covered many of the current frameworks available. He does a great job of discussing the good and bad of using frameworks - and where frameworks are best suited.

Overall, this book was a great read. This book is geared for the beginner, and I believe it will help a user have a complete grasp of AJAX. AJAX is a tricky subject, and Jeremy does a great job of tackling each subject in great detail. This book would go well with a Javascript book to help you bulletproof your applications. This is a must read for those who are interested in understanding AJAX and its place in the world of web standards.
36 人中、34人の方が、「このレビューが参考になった」と投票しています。
5つ星のうち 5.0 Perfect Ajax book 2007/3/6
By Frank Stepanski - (Amazon.com)
形式:ペーパーバック
Jeremy Keith has been on forefront of upcoming web practices for quite awhile now. He is a member of the Web Standards Project, joint lead of the DOM Scripting Task Force, stresses web standards and accessibly in web design. His website addaciao.com is a great resource of material on the subject and you can pretty much find him at almost any web conference in the world nowadays.

This is his second book (Dom Scripting), and it pretty much continues his relentless pursuits of accessibility and unobtrusiveness wherever JavaScript is involved. This book focuses on the creating well structured Ajax web applications but making sure the reader does not forget the most important thing about web sites: their content. If all this fancy-shaky, bells and whistles Ajax stuff prevents a disabled user using a screen reader to be able to view your website content, what is the point?

The book is aimed (like his first) at web designers as opposed to programmers. Jeremy does not use fancy techo-bable when regular simple English will suffice. He wants to make sure that anybody can understands the concepts of Ajax and its components (JavaScript, XML, XMLHTTPRequest) can be used properly by anybody who is willing to read it. Not too many books are written like this (unfortunately) and it is a joy to read. Though when you actually see it and how short it is (barely 200 pages with index), you may thing..."this is too short for me to get anything out of this". But you would be so wrong. There are around 10 or so Ajax books out there now (more on the way I'm sure), and I probably have at least half them. I would put this as probably I the top 2 of all the Ajax books out there. IF you are really going to immerse yourself in learning and using Ajax, I would suggest getting one more "BIG" reference type book on it and that would all you would need. This is a must-buy for anybody wanting to learn Ajax with standards, accessibility in mind.

Ok, enough about how much I like this book, on with some details about the book:

Chapter 1: A nicely illustrated introduction of what Ajax is what pieces comprise it, who started using it, how it is used and why it is so "hype" right now.

Chapter 2: A very nice introduction to JavaScript and DOM basics. Honestly, this chapters takes about the best of Jeremy's DOM Scripting Book and condenses it into about 10 pages. Of course it is just a overview of the DOM methods and a brief explanation of each, but it is all you really need to get started. You should buy his DOM Scripting book if you want to get some hands-on experience with the DOM. Or get the JavaScript Reference book from oreilly which is a JavaScript encyclopedia of everything there is to know about it.

Chapter 3: XMLHttpRequest - The "meat-and-potatoes" of how Ajax works. Jeremy does a great job of explaning the history of how this object got first developed (IE 5 - XMLRequest) and is used with proper object detection.

Chapter 4: Jeremy discusses the good and bad of using XML and JSON to transport data. Very helpful.

Chapter 5: Hijax: Jeremys own creating of progressive enhancement and Ajax. He continues his "unobtrusive JavaScript" techniques with DOM Scripting and goes into the Ajax arena. No other book that I have seen talks about this topic when dealing with Ajax. All I see in other books is using fancy APIs and Patterns, but what if JavaScript is unavailable? Now what will your web app do? Obviously not much unless you read this chapter.

Chapter 6: Tough obstacles when developing Ajax apps such as: Bookmarking, Back button, user feedback are discusses to make sure the user experience continues to be a good one.

Chapter 7: Screen readers and Ajax - A tough sell.

Chapter 8: Putting it all together - A nice complete Ajax web app (Book Shopping Cart) that takes everything Jeremy has talked about up till now

Chapter: The Future? A discussion of the different frameworks available: Dojo, prototype, script.aculo.us, Y! UI, JQuery and mochikit.

As I've said before even though this book is short, the bang for the buck is more than any other Ajax book on the market today, hands down. Go out and buy it!
13 人中、13人の方が、「このレビューが参考になった」と投票しています。
5つ星のうち 5.0 A clear and concise introduction to Ajax, written for designers and front-end developers 2007/5/21
By Adrienne Adams - (Amazon.com)
形式:ペーパーバック|Amazon.co.jpで購入済み
"Bulletproof Ajax" is an indispensable resource for any front-end web designer, developer, or interaction designer who is involved or is planning on being involved in a project that includes Ajax techniques. Whether working on an in-house team or as an independent consultant, you'll need to understand the pros and cons of using this popular and somewhat controversial method of serving web pages.

This is not a book for web designers who don't want to code. In order to benefit from this book, you'll need a strong understanding of semantic XHTML and CSS. A passing familiarity with JavaScript is a definite plus as well. (Keith's previous book, DOM Scripting: Web Design with JavaScript and the Document Object Model, is a good place to start.) Chapter 2 begins with an excellent overview of JavaScript terms and functions--the best I've read. (Until you become familiar with JavaScript statements, variables, data types, etc., you'll no doubt be referring back to this chapter often!)

I found that "Bulletproof Ajax's" greatest strength is presenting ways to evaluate why and how a project should or shouldn't include Ajax:

1. Is Ajax appropriate for the project?
2. If yes, how will we most effectively implement Ajax?
3. How will we provide for site visitors who don't have JavaScript enabled on their browsers?
4. How will we address accessibility issues?

In Chapter 5, Keith elaborates on a technique he calls Hijax (which he introduced in DOM Scripting: Web Design with JavaScript and the Document Object Model). This technique applies two key concepts of modern web design: progressive enhancement and graceful degradation. Although Hijax isn't the answer to all Ajax issues, the idea goes a long way towards ensuring that your carefully crafted Ajax goodness doesn't alienate and/or exclude non-JavaScript site visitors.

Simply put, "Bulletproof Ajax" will allow YOU (the front-end guys and gals) to communicate with THEM (the back-end guys and gals) about Ajax and its implementation. This book can help you and your team clarify expectations about Ajax, implement user-centered solutions, and, in all likelihood, save you time and money too.
10 人中、10人の方が、「このレビューが参考になった」と投票しています。
5つ星のうち 5.0 Ajax for Designers 2007/4/23
By Nathan Smith - (Amazon.com)
形式:ペーパーバック
The trouble with most JavaScript and Ajax related books is they make certain assumptions about the reader, namely that he or she is coming from a server-side programming background. They often say things like: "For those of you who have coded in Python..." or "Perl style regular expressions..." This is good if indeed you are familiar with Python or Perl, etc. But what about the rest of us?

Thankfully, Jeremy Keith has stepped up to fill the void with Bulletproof Ajax. This book does not presuppose a heavy programming background. Instead, it is geared towards the web designer who wants to become more of a front-end developer. The prerequisites are: understanding of semantics, HTML and CSS. If that's you - good news! You already have a working knowledge of the Document Object Model, an essential piece of the Ajax puzzle. Who better to explain it, than co-lead of the DOM Scripting Task Force himself.

This book begins by laying the groundwork for an intelligible conversation. It defines JavaScript syntax such as: functions, methods, arrays and objects. With that vocabulary in place, it jumps into manipulating XHTML documents with JavaScript. It then explains unobtrusive concepts, and gets into the XMLHttpRequest and the world of possibilities that come with it.

This book is unique in that it actually acknowledges the drawbacks of Ajax and, like it's namesake Bulletproof Web Design, helps you plan for contingencies. Rather than referring to accessibility as something that must be added in later, he advocates not removing it in the first place. After all, HTML is already accessible. It's things we do to it with CSS and JavaScript that taint it. On page 102, he urges developers to:

1. Plan for Ajax from the start.

2. Implement Ajax at the end.

He also warns against using JavaScript alone to handle things like form validation and complex calculations. If you rely on this only, you have no fall-back plan. Ideally, JavaScript should be like a waiter going to a from a kitchen, serving things to the end-user. Let me share a few more quotes.

Page 99:

"Far too many Ajax applications are built on the assumption that JavaScript will be available. Instead of treating the language as a tool for enhancing functionality, these applications make JavaScript a requirement. Core functionality is carried out with JavaScript, resulting in an all-or-nothing situation for the user."

Page 116:

"Just because you've hired a waiter doesn't mean you can fire the cook. Yet this is exactly what some Ajax applications attempt to do. Not content with having a waiter take orders and bring food, they get the waiter to do all the cooking too. Cooking should happen in the kitchen. Application logic belongs on the server. It's better for everyone that way. Your application will work more consistently when it's server-based. The browser environment is simply too unpredictable."

I also appreciated Jeremy's subtle sense of humor throughout the book: telling of the origins of the name Ajax, dating back to Greek mythology, and adding a tie-in with the name Jason when referring to JSON. If you didn't know, he's quite a trivia guru, especially when it comes to Star Wars Trivial Pursuit.

I applaud that Jeremy is using XHTML 1.0 Strict throughout this book, as opposed to XHTML 1.1 as in DOM Scripting. It avoids confusion over content-type: text/html vs. application/xhtml+xml. After all, the W3C themselves serve XHTML 1.0 Strict as text/html.

Overall, this book was a delight to read. It covers all the important aspects of Ajax, and even shows a few server-side examples written in PHP. Multiple techniques are addressed, including XML, JSON and innerHTML.

It gets you thinking, rather than ignorantly assuming that you're working in a controlled environment. Many server-side developers neglect accessibility and usability because they're too busy using bloated frameworks without understanding the underlying client-side principles. Quite frankly, I'm sick of it. Luckily, there's finally a book teaching the right way.

Page 196:

"Question the way you implement Ajax. Question the impact Ajax will have on your users. Question the need to use Ajax at all."
9 人中、9人の方が、「このレビューが参考になった」と投票しています。
5つ星のうち 5.0 Ajax/HiJax - Enhance Your Website Without Losing Viewers 2007/3/14
By George Wade - (Amazon.com)
形式:ペーパーバック|Amazon.co.jpで購入済み
I've written Ajax applications using the XMLhttp object a few times requesting both xml and text responses. I've also use the script.aculo.us library to write Ajax applications. Bulletproof Ajax does more than show you the basic ropes.

Bulletproof Ajax explains all the pieces, including xml after-processing. It also demonstrates what Jeremy Keith calls Hijax. I normally write applications for an intranet so had not given unobtrusive Ajax much thought. But just today I discovered that my personal laptop did not have the XML parser installed. So for non-intranet applications, to be sure that the viewer can access your application it had better run without ajax. Jeremy demonstrates how to use Ajax to enhance a web application without enforcing the presence of javascript or the XML parser.

Jeremy also presents JSON scripting which he explains is a way to perform defacto Ajax without the limitation of same-site sources. JSON permits, in essence, cross-site ajax.

I personally also learned more about javascript object programming than I'd clearly understood previously. Jeremy doesn't assume that you know unstated fundamentals and yet he takes you through these fundamentals without making it a chore. As with his previous book DOM Scripting, Jeremy leads you into confident programming. Using what I learned reading Bulletproof Ajax I just wrote my own object library for Ajax with enhancements I wanted. Now, when developing intranet applications I won't be stuck facing errors resulting from someone else's ajax library which I don't understand and wouldn't want to change or maintain.
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