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XML: The preferred approach is to send and receive XML. The XML can be transformed or parsed on the client side by manipulating the XML object model, or an Extensible Stylesheet Language Transformations (XSLT) library can be used to transform the XML into another object model such as HTML. The reason XML is preferred is that XML is a known technology and the tools to manipulate XML are well defined, working, and stable. XML is a very well established technology that you can search, slice, dice, persist, and validate without having to write extra code. Some do consider XML heavy because of the angle brackets and other XML character tokens. The advantage, though, is that when a server-side application generates XML, it can be processed by a web-browser-based client or a non-GUI-based browser. The choice of how to parse the XML and what information to process depends entirely on the client, so long as the client knows how to parse XML. XML is flexible and should be used. Throughout this book, XML will be used extensively and is considered the premier data exchange format. There are other data exchange formats, such as JavaScript Object Notation (JSON).1 However, I advise when those formats are chosen that you carefully consider the ramifications. It is not that I find them badly designed or improper. What concerns me about these other data exchange formats is that they do not provide as extensive an environment as XML for processing, searching, validating, and generating. For example, using XPath I search for specific elements in XML without having to parse the entire XML document. Granted, XML might in certain conditions not have the same performance levels as, let s say, JSON. For those readers who do not care whatsoever for the diversity of XML and are sure that they will never need it, JSON might be the right technology. However, I do not cover other technologies such as JSON in the EBVN scope of this pattern or in the rest of the book. Now that you understand the architecture, you re ready to see some implementations that demonstrate how that architecture is realized.
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When implementing the Content Chunking pattern, the sequence of steps outlined earlier needs to be followed (event, request, response, and injection). The logic is easily implemented by using the Asynchronous type, because the Asynchronous type can be called by an HTML event and there is an explicit response method implementation. The example implementations that follow will illustrate how to generate the events by using HTML, call the functions, generate requests by using XMLHttpRequest, and process responses by using Dynamic HTML and JavaScript techniques.
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The implementation of the Content Chunking pattern requires creating an HTML page that serves as the framework. The idea behind the framework page is to provide the structure into which content can be chunked. The framework page is the controller and provides a minimal amount of content. The following HTML code is an example HTML framework page that will dynamically inject HTML content into a specific area on the HTML page:
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1. http://www.crockford.com/JSON/index.html
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<html> <head> <title>Document Chunk HTML</title> <script language="JavaScript" src="/lib/factory.js"></script> <script language="JavaScript" src="/lib/asynchronous.js"></script> <script language="JavaScript" type="text/javascript"> var asynchronous = new Asynchronous(); asynchronous.complete = function(status, statusText, responseText, responseXML) { document.getElementById("insertplace").innerHTML = responseText; } </script> </head> <body onload="asynchronous.call('/chap03/chunkhtml01.html')"> <table> <tr><td id="insertplace">Nothing</td></tr> </table> </body> </html> In the HTML code, the class Asynchronous is instantiated and the asynchronous.complete property is assigned a function callback. How the Asynchronous class works and which properties need to be assigned was discussed in 2. The instantiation of asynchronous occurs as the HTML page is loading. After the page has loaded and is complete, the event EBVN onload is executed which is the event step of the pattern implementation. The onload event calls the asynchronous.call method to execute an XMLHttpRequest request to download an HTML chunk which is the request step of the pattern implementation. After the request has completed, a response is generated that when received by the client results in the method asynchronous.complete being called. The received response is the response step of the pattern implementation. In the example, the method asynchronous.complete is assigned an anonymous JavaScript function. In the implementation of the anonymous function, the method getElementById is called to insert the XMLHttpRequest results into an HTML element. The HTML element is located by the identifier insertplace, which happens to be the HTML tag td. The referencing of the Dynamic HTML element and its assignment using the innerHTML property is the HTML injection which represents the injection step of the pattern implementation. In the example, it is odd that after the HTML page is downloaded, processed, and considered complete, another piece of logic is called. The other piece of logic is used to retrieve the rest of the content in the form of a chunk. The server-side code could have generated the complete page in the first place. However, it was illustrated in this fashion to show how simple the implementation of the Content Chunking pattern can be. The example illustrated reacting to the onload page event, but any event could be used. For example, examples in 2 used the button onclick event. A script could even simulate events by using the Click() method. This example illustrated separation of the HTML page s appearance from its logic. The framework HTML page could be realized by an HTML designer. For the area where content is injected, the HTML designer would need only to add a placeholder token identifier such as Nothing. A server-side web application programmer creates the generated content that replaces the placeholder. The HTML designer would not need to be concerned with any server programming technology because the framework HTML page would contain only client-side instructions.
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