Download e-book for iPad: Build Your Own Ajax Web Applications by Matthew Eernisse

By Matthew Eernisse

ISBN-10: 0975841947

ISBN-13: 9780975841945

AJAX (Asynchronous JavaScript and XML) is a brand new method for constructing net purposes. It basically allows clients to have interaction with a web site with out forcing a gradual & tedious reload of the whole web page after each motion. this implies net purposes turn into extra responsive, more uncomplicated to take advantage of, and extra intuitive. construct your individual Ajax internet purposes makes use of a step by step educational structure that is really easy to persist with, possible construct subtle and intuitive Ajax internet interfaces very quickly! Get an outline of the elemental applied sciences you have to to exploit to construct Ajax functions. comprehend the XMLHttpRequest item, the middle of Ajax functions. construct a cross-browser XMLHttpRequest wrapper for you to use in your entire Ajax tasks.

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On the other hand, the fact that AJAX development embraces so many different technologies makes it a lot more interesting and fun. Here’s a brief listing of the technologies that work together to make an AJAX web application: ❑ XML ❑ the W3C DOM ❑ CSS ❑ XMLHttpRequest ❑ JavaScript Through the rest of this chapter, we’ll meet each of these technologies and discuss the roles they play in an AJAX web application. ) Data Exchange Lingua Franca XML often serves as the main data format used in the asynchronous HTTP requests that communicate between the browser and the server in an AJAX application.

For example, if you’re passing an XML document back to the caller, you would naturally want to use text/xml. info Chapter 2: Basic XMLHttpRequest ' There is no equivalent to sleep in ASP. NET, Java, Perl, or just about any language that can serve content through a web server. Use the setMimeType Method Imagine that you have a response that you know contains a valid XML document that you want to parse as XML, but the server insists on serving it to you as text/plain. php', hand, 'xml'); Naturally, you should use this approach only when you’re certain that the response from the server will be valid XML, and you can be sure that the browser is Firefox or Safari.

The misperception of JavaScript as a “toy language” is now changing rapidly as AJAX development techniques expand the power and functionality of browserbased applications. As a result of the advent of AJAX, JavaScript now seems to be undergoing something of a renaissance, and the explosive growth in the number of JavaScript toolkits and libraries available for AJAX development is proof of the fact. Summary In this chapter, we had a quick overview of AJAX and the technologies that make it tick. We looked at some of the horrible coding contortions that developers had to endure back in the bad old days to create something resembling an interactive UI, and we saw how AJAX offers a huge improvement on those approaches.

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Build Your Own Ajax Web Applications by Matthew Eernisse

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