Download Ajax For Dummies by Steve Holzner PDF

By Steve Holzner

Ajax is brief for “Asynchronous JavaScript+CSS+DOM+XMLHttpRequest.”
Even in the event you weren’t intimidated earlier than, that tidbit is perhaps sufficient to make you succeed in for the Excedrin. simply succeed in for Ajax For Dummies as an alternative. With monitor photographs, genuine code and reasons, and stay websites the place you will see that Ajax functions doing their factor, it is going to have you ever utilizing Ajax to create net purposes that glance an act like computing device purposes very quickly. With Ajax, you could accelerate and freshen up your net functions. consumers at your on-line shop can fill their carts with no awaiting a number of web page refreshes. Searchers in your websites can get quick effects at the related page.
This advisor takes you on a journey of the way Ajax is used at the present time, whole with examples of Ajax functions in motion, equivalent to an Ajax-enabled Yahoo! seek or an Ajax-based chat program. Then it delivers fundamentals on utilizing JavaScript. After that you simply dive in and get information on:* Writing a few Ajax, interactive mouseovers utilizing Ajax, passing info to the server with GET or put up, and extra* Connecting to Google for a reside seek* utilizing unfastened Ajax frameworks so that you don’t need to commence from scratch, together with Ajax Gold (written particularly for this book), AJAXLib, and grabbing XML with libXmlRequest* every kind of Ajax strategies, similar to utilizing Ajax for drag-and-drop operations, pop-up menus, downloading pictures 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 establishing the types, exhibiting a menu, styling textual content, dealing with shades and backgrounds, and extra* operating with Ajax and PHP
Complete with a spouse site, unfastened Ajax frameworks, and pattern code you should use, Ajax for Dummies is your pleasant consultant to making really simple net sites!
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Here’s how to do it: Say that you want to pass the text to write to the displayText function. It’s easy; when you call the function, just pass the text you want to write in the parentheses following the name of the function, like this: displayText(‘You’re using JavaScript’). The data you pass to a function this way — in this case, that’s just the text “You’re using JavaScript” — is called an argument. So here, you’re passing a single argument to the displayText function. Then you set up the function itself by giving a name to the passed data in the parentheses like this, where I name that text simply text: function displayText(text) { .

Figure 1-8: Ajaxenabled pop-up menus. Chapter 1: Ajax 101 Modifying Web pages on the fly Ajax excels at updating Web pages on the fly without page refreshes, and you can find hundreds of Ajax applications doing exactly that. org/rico/demos. html, shown in Figure 1-9. When you click someone’s name, a “card” appears with their full data. Figure 1-9: An Ajax rolodex. com/spy. This news Web site uses Ajax techniques to update itself periodically by adding new article titles to the list on the page.

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. txt, stored on the server.

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