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Figure 3-2. Traditional client application In Figure 3-2, the RealPlayer is an example of a traditional client application that mixes newer HTML-type technologies with traditional user interface elements. Clicking the Burn Your CD button causes RealPlayer to burn your CD but does not affect the advertisement that is running at the top half of the application. The logic associated with the advertisement and the logic associated with burning the CD are two separate, distinct pieces of logic that happen to be sharing the same window area. Figure 3-3 dissects the web application of Figure 3-1 into distinct pieces of logic.

vcf, you can use the same format to download a contact: http://[ServerName]/[Site Path]/_vti_bin/owssvrdll Cmd=Display&ID=n& List={List GUID}&Using=_/layouts/eventics&CacheControl=1 The dialogview Method One of the most common complaints I hear about WSS is that there is no immediate way to have a single Document Library show up on multiple web pages It often seems as though documents are locked into the boundary defined by the hosting site, which can make it difficult to find documents The only simple way to solve this problem seems to be to use a Web Page Viewer web part to point at the Document Library of interest The problem with this approach, however, is that the entire page including the navigation elements is shown in the web part Fortunately, a better solution exists in the form of an RPC call to the dialogview method.

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Figure 3-3. Website architecture In Figure 3-3, the original HTML page has links to two other pages that represent an example blog and article content. The example content has two execution blocks: Get Navigation and Get Content (1,2). The logic used to generate Get Content 1 is distinct from the logic used to generate Get Content 2. In the context of generating an HTML page, when either Get Content 1 or Get Content 2 is executed, the logic Get Navigation is executed. This means the logic Get Navigation is executed multiple times, generating the same data each time. Some readers might argue that different data is generated by Get Navigation (e.g., different folders are opened), but in fact it is the same data formatted a different way. In a nutshell, there is an inherent datageneration redundancy that should be avoided. The solution is to distribute the logic so that an HTML page is generated, by using an architecture similar to Figure 3-4.

The CallerStockTracer function implementation calls StockTracerTraditional with the appropriate ticker, and the returned object instance is assigned to obj Then a decision is made to verify if obj is null or not If the ticker has been found, then obj will not be null and the object can be processed Otherwise, the function returns without doing anything..

The dialogview method is an RPC call that gives you direct access to the open, save, and property views used by Microsoft Office products When you utilize this call, you ll immediately notice that the results are identical to what you see when opening or saving a document in Microsoft Office The dialogview method takes only three parameters, which are described in Table 2-11..

In Figure 3-4, the HTML page is the result of multiple pieces of server-side logic. When the main outline of the HTML page has been loaded, the XMLHttpRequest object retrieves the content blocks Get Navigation, Get Content 1, and Get Content 2. When and how the individual content blocks are retrieved depends on the events and links created by the content blocks. Each content block is a separate request that needs to be called by the XMLHttpRequest type. The proposed architecture has the following advantages: The client downloads only what is necessary, when it is necessary. There is no need to re-retrieve a content block unless necessary. The architecture is separated into different code blocks that can be assembled dynamically in different contexts. The architecture resembles that of a traditional client in that only those elements that pertain to the event are manipulated. The overall look and feel is not affected because the generated code blocks delegate the look and feel to the parent HTML page retrieving the content blocks. Figure 3-4 shows how the Content Chunking pattern got its name: a single HTML page is the sum of its chunks of content, which are referenced and loaded separately.

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