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property exists. If the property does exist, the element.callback is tested to perform some finetuning that is associated with the state. After the element.callback test, the HTML span innerHTML property is assigned. Getting back to the HTML callback property, the purpose of the property is to allow a customization operation. This goes back to the bold span elements for gender. One of the span elements is for the machine-friendly state, and the other is for the user-friendly view. The conversion works because a callback is associated with a span element by using the dynamic extension facilities used to assign the methods assignState and extractState. When the callback is called, the assigned machine-friendly state is inspected and converted into a user-friendly view. Figure 7-14 illustrates the sequence of events.
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Figure 7-14. Sequence of events for generating a custom output
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In Figure 7-14, the callback function is assigned dynamically to a span element. The assigned callback then manipulates another span element (html-gender) that contains the user-friendly representation. Extending an individual element allows the generic routines to generically extract or assign state, while still allowing fine-tuning. The implementation of the callback function is as follows: localel( "embedded", "gender").callback = function( state) { if( state.gender == "m") { localel( "embedded", "html-gender").innerHTML = "Male"; } else if( state.gender == "f") { localel( "embedded", "html-gender").innerHTML = "Female"; } } The definition of the callback function does not use the el function, but the localel function. The reason is that when using generic routines to process the state, each representation will have an identifier with the same name as the property. This means a single HTML page can have multiple identical identifiers, causing an identifier clash. If the function document. getElementById is used, the first found identifier will be returned. The function localel does two things: find the reference point to the representation, and then iterate the view to find the appropriately named element. In the example, that means the embedded parent HTML element has its children searched for an identifier gender. The embedded identifier is unique and is retrieved by using the function document.getElementById.
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By combining the generic routines with the element assigned, fine-tuning makes it possible to develop representations that manipulate state in a general manner. From an HTML coder s perspective, the state is embedded in the HTML document and not in the JavaScript. Consider the following JavaScript, which illustrates how this would work: <script language="JavaScript" type="text/javascript"> function ShowContent( element) { ddrivetip( document.getElementById( "txt" + element.title).innerHTML, 300); } </script> <body> ... <div> <span id="txtDecoupledNavigation" style="position:absolute;visibility:hidden;"> ... </span> <span id="txtRestBasedMVC" style="position:absolute;visibility:hidden;"> ... </span> <span id="txtRepresentationMorphing" EBVN style="position:absolute;visibility:hidden;"> ... </span> ... <map id="patterns" name="patterns"> <area shape="rect"#DecoupledNavigation onmouseover="ShowContent( this)" coords="105,13,204,58" href="#null" title="DecoupledNavigation" onclick="return ShowLinks( this)"> </area> In the example, the function ShowContent implements the logic whereby the parameter content of a function is driven by the title attribute of an HTML element. The content of the parameter is the result of retrieving the content from a span element. In the example, the span contents are hard-coded, but they could also have been the result of doing a Content Chunking pattern call. Additionally, the span element and its contents are XML compliant, using XHTML element identifiers to delegate the hard work of processing the data to the web browser.
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The Details of an XSLT Representation Reference Point
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Another way to transform the state from one representation to another is to use Extensible Stylesheet Language Transformations (XSLT). XSLT is a technology that uses a programming language defined in XML to transform XML content into other text-based content. The state of
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CHAPTER 7 REPRESENTATION MORPHING PATTERN
the representation is stored as XML-compliant HTML. By using an XSLT transformation, the state is extracted from one representation and injected into another. XSLT requires some content to transform. In the case of the Representation Morphing pattern, the content to transform is the other representation. The result is another transformation. What this means is that all of the representations need to use some common HTML tags such as HTML form elements, or span tags, or some other common tag. The common tags can be surrounded with unknown other tags because they are considered irrelevant. In a nutshell, the XSLT transformation accomplishes the same as the parseElement and processElement functions. The difference with the XSLT transformation is that it is accomplished all in one step, and not in two function calls. Furthermore, the entire processing is XML-based. When using XSLT, the representation is not a classical Model View Controller architecture because the controller and the view are combined. Let s look back at the HTML framework and at how the XSLT reference point is defined: <div id="htmlxslt"> <div id="xsltFromSpan" style="visibility:hidden"> <![CDATA[ ]]> </div> <script language="JavaScript"></script> <div id="htmlxsltdest"> </div> </div>
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