Ajax Bible by Steve Holzner

By Steve Holzner

Construct interactive internet purposes with Ajax Create stay searches and on-line spreadsheets notice programming errors to prevent! Create blazing-fast net purposes with strong Ajax if you happen to imagine that studying Ajax is just too tricky, bet back. you could create internet functions that feel and appear like laptop apps in much less time than you think that with the great Ajax guideline during this in-depth booklet. you can find easy-to-follow tutorials, enormous quantities of counsel and methods, and a lot functional details that even expert builders will achieve for this booklet first. allow this Bible be your advisor as you leap into the most popular internet programming expertise in years. * grasp the fundamentals--JavaScript(r), XML, dynamic HTML, and CSS * Tie Ajax into Google with the Google(r) API * deal with simultaneous XMLHttpRequest gadgets in Ajax * Use Ajax frameworks similar to Ruby on Rails, AjaxTags, and others * comprehend the record item version (DOM) * Create floating menus and results with CSS * Encrypt info over undeniable HTTP utilizing JavaScript * Adapt real-world examples for your personal courses better half website locate the entire code used through the ebook at www.wiley.com/go/ajaxbible

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25. qxp Part I 2/23/07 9:44 PM Page 22 Fundamental Ajax Try typing “Hello” in the diary. 26. 26 The diary responds. 27, in which the diary is being asked where it is. 28. 28 The diary indicates where it is. How about a game of Ajax-enabled chess? 29. To move a piece, you have only to click it, then click its new position, and the piece is moved automatically. The game sends all the needed data to the server using Ajax, behind the scenes, and gets the data it needs back. Then it uses CSS to move its piece accordingly.

One of the biggest uses of dragging and dropping with Ajax is to implement shopping carts. Normally, when you want to add an item to a shopping cart online, you have to go through several pages: when you click the Add to Cart button, you then see a new page corresponding to the shopping cart, and then you must navigate backward to continue shopping. Wouldn’t that be much easier if you never had to leave the page you were shopping on? What if you could simply drag an item to the shopping cart, and the server was notified behind the scenes of your purchase?

Can you spot the error? writ, you’re correct. Because the document object doesn’t have a method named writ, no browser is going to be able to run this example. However, the way various browsers handle this issue differs by browser, and that means the tools each browser offers to fix the problem differ. 4. All you see is the

heading in the element — no output from JavaScript. 4 A JavaScript error in Internet Explorer Note in particular the small icon in the lower left corner in the Internet Explorer window, which shows a triangle with an exclamation point.

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