Download Ajax For Dummies by Steve Holzner PDF

By Steve Holzner

Ajax is brief for “Asynchronous JavaScript+CSS+DOM+XMLHttpRequest.”
Even if you happen to weren’t intimidated prior to, that tidbit is maybe sufficient to make you achieve for the Excedrin. simply succeed in for Ajax For Dummies in its place. With display photographs, real code and causes, and reside sites the place you'll find Ajax functions doing their factor, it's going to have you ever utilizing Ajax to create net purposes that glance an act like machine functions very quickly. With Ajax, you could accelerate and freshen up your net purposes. consumers at your on-line shop can fill their carts with no anticipating a number of web page refreshes. Searchers in your websites can get quick effects at the similar page.
This advisor takes you on a travel of ways Ajax is used this present day, whole with examples of Ajax purposes in motion, resembling an Ajax-enabled Yahoo! seek or an Ajax-based chat software. Then it promises fundamentals on utilizing JavaScript. After that you just dive in and get details on:* Writing a few Ajax, interactive mouseovers utilizing Ajax, passing info to the server with GET or submit, and extra* Connecting to Google for a dwell seek* utilizing loose Ajax frameworks so that you don’t need to commence from scratch, together with Ajax Gold (written in particular for this book), AJAXLib, and grabbing XML with libXmlRequest* all types of Ajax thoughts, comparable to utilizing Ajax for drag-and-drop operations, pop-up menus, downloading photos behind the curtain, and extra* utilizing SACK (simple AJAX code kit), interpreting XML with Sarissa, and developing visible results with Rico* dealing with XML int Ajax functions* operating with cascading type sheets (CCS) in Ajax, together with constructing the kinds, showing a menu, styling textual content, dealing with shades and backgrounds, and extra* operating with Ajax and PHP
Complete with a significant other website, unfastened Ajax frameworks, and pattern code you should use, Ajax for Dummies is your pleasant advisor to making really undemanding net sites!
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To do that, you can place that code into a JavaScript function. In JavaScript, a function is a set of lines of code that are run only when you specifically call that function — just what you want here. ) Functions are important for you as an Ajax programmer because unless you pack your code into a function, it runs immediately when the HTML page loads. And if you’ve put your section because they haven’t even loaded yet.

Take a look at Figure 2-1; that Web page displays a message The fetched data will go here. That text is going to change when you click the Display Message button, and no new page fetch will be required. 22 Part I: Getting Started Figure 2-1: A simple Ajax example. To replace the text by using Ajax methods, just click the button now. The browser won’t flicker. , as shown in Figure 2-2. Figure 2-2: You can fetch text with Ajax. That kind of a change is nothing unusual in Web development — as long as the text was stored locally in a script built into the Web page, for example.

Instead, you can choose Tools➪ JavaScript Console to open the Firefox JavaScript Console. This displays the window shown in Figure 2-6. Chapter 2: It’s All About JavaScript Figure 2-4: The yellow triangle of death signifies an error in your JavaScript. Figure 2-5: You can get the details of the error from Internet Explorer. Figure 2-6: The Firefox JavaScript Console. 31 32 Part I: Getting Started You can read right away what the error is: docment isn’t defined. And now that you know what the error is, you can fix it.

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