CHAPTER 3 CONTENT CHUNKING PATTERN When (Ecommerce web host)
CHAPTER 3 CONTENT CHUNKING PATTERN When the displayed content is not related. Yahoo!, MSN, and Excite are portal applications displaying content side-by-side with other content that has no relation to it. If the content is generated from a single HTML page, the server-side logic would have to contain a huge decision block to know which content is loaded and not loaded. A better approach would be to consider each block of content as a separate piece that is then loaded separately. Associated Patterns The Content Chunking pattern is a core pattern to any Ajax application. You could even make the assertion that the Content Chunking pattern is implicit to Ajax. Be that as it may, it is still necessary to identify and define the context of the Content Chunking pattern. What makes the Content Chunking pattern unique is that it always follows the same steps: generated event, request, response, and chunk injection. The other patterns covered in this book are similar, but do take deviations such as sending a request and not getting an immediate response (for example, the Persistent Communications pattern). Architecture The architecture of the Content Chunking pattern is relatively simple. A URL is called by the client. The server responds with some content that is received and processed by the client. An implementation of the Content Chunking pattern always follows these steps: 1. An event is generated that could be the result of a button being clicked or of an HTML page being loaded. 2. The event calls a function that is responsible for creating a URL used to send a request to the server. 3. The server receives the request and associates the request with some content. The content is sent to the client as a response. 4. The client receives the response and injects the response in an area of the HTML page. Implementing Order in a Web Application Looking back at Figure 3-1, the strict hierarchical nature of the website is not a bad thing. With respect to HTML, the result of the strictness is to generate the content in one step, and this all- in-one generation causes problems. Traditional applications do not function in such a manner, as illustrated in Figure 3-2.
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