[...]... refresh Download at WoweBook.Com you are here 4   ajax is a methodology Okay, I get that Ajax makes web pages respond faster, but what exactly is it? Ajax is a new way of using existing technologies Ajax isn’t a whole new technology that you have to learn, like CSS or JavaScript, or a set of graphics techniques you’ll need to crack open PhotoShop to accomplish Ajax is just a new way of thinking about how... that point in the book And the first time through, you need to begin at the beginning, because the book makes assumptions about what you’ve already seen and learned We assume you are familiar with HTML and CSS It would take an entire book to teach you HTML and CSS (in fact, that’s exactly what it took: Head First HTML with CSS & XHTML) We chose to focus this book on Ajax programming, rather than rehash... online at http://www.headfirstlabs.com/books/hfajax to download sample server-side programs, so you can run these apps yourself xxvi   intro Download at WoweBook.Com the intro We encourage you to use more than one browser with this book As much as it sucks, different web browsers handle your HTML, your CSS, and your JavaScript in completely different ways If you want to be a complete Ajax programmer, you... t” We think of a Head Firs reader as a learner re you get it, then make su ? First, you have to latest research e to learn something on the So what does it tak o your head Based out pushing facts int es a lot more forget it It’s not ab hology, learning tak don’t ational psyc urobiology, and educ , ne in cognitive science turns your brain on page We know what than text on a ciples: First lear ning prin... Are you completey new to HTML or CSS or JavaScript? (You don’t need to be advanced, but you should definitely have some experience If not, go get a copy of Head First HTML and CSS, today, and then come back and get this book.) 2 Are you a kick-butt Ajax or web developer looking for a reference book? 3 Are you afraid to try something different? Would you rather have a root canal than mix stripes with... complete—they are written specifically for learning, and aren’t always fully functional We’ve placed all the example files on the Web so you can download them You’ll find them at http://www.headfirstlabs.com/books/hfajax/ The ‘Brain Power’ exercises don’t have answers For some of them, there is no right answer, and for others, part of the learning experience of the Brain Power activities is for you to...    Chapter 1 Download at WoweBook.Com using ajax Web pages reinvented Using Ajax, your pages and applications only ask the server for what they really need—just the parts of a page that need to change, and just the parts that the server has to provide That means less traffic, smaller updates, and less time sitting around waiting for page refreshes With Ajax, the browser only sends and receives the... Rails, C#, and a whole lot more Ajax programming works with all of these languages, and we have tried to represent several of them in this book’s examples To keep you focused on learning Ajax, though, we do not spend much time explaining the server-side programs used; we’ll show you the basic inputs and outputs to the server, but that’s as far as we go We believe that your Ajax applications can be written... check to make sure your request data was RECEIVED 456 Why didn’t the POST request work? 458 The server unencodes POST data 459 We need to TELL the server what we’re sending 460 Set a request header using setRequestHeader() on your request object 462 Since this is a POST request, there’s no data in the actual request URL register.php Web server The server takes the data from the req and turns it into... are to help with memory, some are for understanding, and some will help you apply what you’ve learned Don’t skip the exercises The redundancy is intentional and important One distinct difference in a Head First book is that we want you to really get it And we want you to finish the book remembering what you’ve learned Most reference books don’t have retention and recall as a goal, but this book is about . Patterns Head First Servlets and JSP Head First EJB Head First PMP Head First SQL Head First C# Head First Software Development Head First JavaScript Head First. O’Reilly’s Head First series Head First Java TM Head First Object-Oriented Analysis and Design (OOA&D) Head First HTML with CSS and XHTML Head First Design