CHAPTER 1 INTRODUCTION TO (Business web site) AJAX Figure 1-9.
CHAPTER 1 INTRODUCTION TO AJAX Figure 1-9. Ajax architecture The data is fetched from the server by using a Representational State Transfer (REST)4 architecture style. The essence of REST is to create a simpler web services architecture by using HyperText Transfer Protocol (HTTP). REST is used solely for the transfer of data, and in particular E B V N is used extensively with Ajax applications. The overall idea is to generate content and to have that content filtered and processed. The filtered and processed content serves as an information basis, where another process acts as a client that filters and processes the information. The filtered and processed information acts as an information basis for another client. Content is fluid and constantly modified. In Figure 1-9, the browser seems to be an end point where the data is not filtered or processed any further. However, that is very far from the truth. In an Ajax infrastructure, the data is always in a state of flux. A script can be used to retrieve HTML content that is saved to a file. Another script processes the saved HTML content that could serve as content for a web service. Putting it simply, when writing an Ajax application the data is never final and always in a state of flux. It s About the Data At the time of this writing, many people were working furiously on getting toolkits ready to make it possible to write Ajax applications. In fact, it has been mentioned that Ajax was already invented long before it became popular.5 Although I agree that Ajax has been around a long time, the question is why is Ajax popular now? Mainly because Ajax involves the manipulation of data streams. We have an Internet economy and Ajax makes that economy work better. Let s focus on Google and Map.search.ch. What do both of these sites sell? They don t sell software; they sell data! Map.search.ch sells information about Swiss addresses. Google sells information about basically everything on this planet. The strength of Google is not in the soft ware that it sells or offers, but in the ability to manage and present the data. 4. http://en.wikipedia.org/wiki/REST 5. http://radio.weblogs.com/0001011/2005/06/28.html#a10498
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