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CHAPTER 3 CONTENT CHUNKING PATTERN
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E B V N Figure 3-4. Improved website architecture
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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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CHAPTER 3 CONTENT CHUNKING PATTERN
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Defining the Content Within a Content Chunk
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The content chunks referenced by the XMLHttpRequest object can be in any form that both the client and server can understand. Whatever the server sends must be understood by the client. In Figure 3-4, the content chunks would be in HTML because the chunks would be injected directly into the HTML page. HTML, though, is not the only format that can be sent to and from the server. The following formats are covered in this chapter: HTML: The server can send HTML to the client directly. The received HTML would not be processed, but injected directly into the HTML page. This is a blind processing approach in that the client has no idea what the HTML does, and knows only that it should be injected into a certain area of the HTML document. Injecting HTML directly is a very simple and foolproof way of building content. The client has to do no processing and needs to know only the destination area of the HTML content. If processing is necessary, the received content (if it is XML compliant) would also be available as an instantiated object model. Using the instantiated object model, it is possible to manually manipulate the received HTML content. It is advised that the HTML content sent to the client be XHTML compliant (HTML that implements a particular XML schema) or at least XML compliant. Images: It is not possible to directly send images because images are binary, and the XMLHttpRequest object cannot process binary data. Typically, image references are sent as HTML tags that are injected into the HTML document, resulting in the remote image to be loaded. It is possible to download and reference binary data if the data has been encoded and decoded by using Base64 encoding. However, manipulating binary data directly is not recommended because that will create more problems than it solves. JavaScript: The server can send JavaScript to the client that can be executed by using the JavaScript eval statement, and the client can send persisted JavaScript objects to the server for further processing. A first impression may be that executing arbitrary JavaScript presents a security problem. It is not typically a problem because the JavaScript engines in all browsers use the same origin and sandbox policies. Sending arbitrary JavaScript to execute could be a security problem if there is a bug in the JavaScript engine. Sending JavaScript is desirable if you want to dynamically execute and add logic on the client that was not loaded when the initial HTML page was loaded. It is a very powerful method of enhancing the functionality of a client without the client having to be aware of that. For example, let s say an HTML form element needs validation. Because different users have different validations, it would not be desirable to send all validation implementations to the client. A solution would be to let the user decide which HTML form element they are presented with, and then dynamically download the validation of the form element as a content chunk. Be forewarned, though, that sending JavaScript chunks could open up your application to hackers. So think before using this technique.
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