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Ajax
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Ajax
http://www.yourhtmlsource.com/javascript/ajax.html
Ajax is actually a family of technologies that have been available for years. The means to make requests to the server using only JavaScript were built into Internet Explorer 5.5, but the possibilities of the technology were overlooked. It was only in 2005 that the techniques were rediscovered and used, notably to excellent effect in Google?s ? GMail web application.
Ajax > Tips and Tutorials
Nov 11, 2006
Ross Shannon
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In our last article, we touched the surface of Ajax by developing a simple email validation application. In this article we are going to delve deeper into Ajax and explore how XSL can be used on both the client side (using Javascript) and on the server (using PHP) to transform XML data into XHTML
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One of the newest things to take the web development industry by storm is the use of AJAX (Asynchronous Javascript And XML), which uses the XMLHttpRequest object. The beauty of this new technology is it allows designers and developers to add interactive or live parts to their website without have to reload the page. This can include live information such as stock market values (the FTSE 100 is a great example as its value can change as quickly as every minute) and the number of posts on a forum. All these values could change on a page without having to refresh to page every minute.
This tutorial will hopefully give you some idea on how to use the XMLHttpRequest object in your website apps to improve user interactivity and the general functionality of your website. It is advised that you have some background knowledge of JavaScript, and for this example, PHP (or some other server-side scripting language such as Perl or ASP).
Below is the entire code of the script, so you can see what it will look like at the end. I will go through each part in turn through the tutorial:
This tutorial will hopefully give you some idea on how to use the XMLHttpRequest object in your website apps to improve user interactivity and the general functionality of your website. It is advised that you have some background knowledge of JavaScript, and for this example, PHP (or some other server-side scripting language such as Perl or ASP).
Below is the entire code of the script, so you can see what it will look like at the end. I will go through each part in turn through the tutorial:
Category:
Ajax programming is one of the most exciting new technologies in recent history. Ajax (Asynchronous Javascript and XML) allows a web page to refresh a small portion of its data from a web server, rather than being forced to reload and redraw the entire page as in traditional web programming. Since they can make frequent, small updates, web applications written with Ajax programming can present user interfaces that are more like desktop applications, which are more natural and intuitive interfaces for most users. However, just like Uncle Ben said to Peter Parker (aka Spider-Manâ„¢)(1), with great power comes great responsibility. Web applications have become prime targets for malicious users and hackers performing SQL injection and similar attacks.
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When Ajax was introduced to the early and experienced developers, only JavaScript developers rejoiced because that is the main programming language of Ajax. Others who wanted to jump in the Ajax bandwagon would just have to study the language from the scratch. Among the developers, those who already knew Java were struggling to cope up. Not that they do not know the language but their knowledge are just in the gateway to know something but not everything. They were forced to leave Java and move to JavaScript just to use Ajax.
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When an HTML page is used in conjunction with JavaScript technology, this page can contact the server which loaded it and request content. This content may be altered in the form of XML documents, as well regular text, HTML, or JSON. The JavaScript system can then take this content and alter the Document Object Model within the HTML page. Ajax is used as a broad term to describe this interactive model. However, it should be emphasized that Ajax is not entirely new. The underlying technology for Ajax has been available for a number of years.
However, the proliferation of this technology has been hampered by a number of technical barriers. The biggest barrier that Ajax developers faced was the lack of an advanced remote scripting system. To deal with these problems, developers were forced to use Java applets, plug-ins, and frames which were hidden from the eyes of the user. While these tools did create a certain level of interactivity on the web, the system still was heavily limited in its true capabilities.
However, the proliferation of this technology has been hampered by a number of technical barriers. The biggest barrier that Ajax developers faced was the lack of an advanced remote scripting system. To deal with these problems, developers were forced to use Java applets, plug-ins, and frames which were hidden from the eyes of the user. While these tools did create a certain level of interactivity on the web, the system still was heavily limited in its true capabilities.
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