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The next step is to convert the architecture illustrated in Figure 3-2 into a usable solution. This recipe focuses on the client side and ignores the server side. It considers the server side to be a black box that receives and sends data. To start, let s look at the HTML page used to add two numbers together.
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Source: /website/ROOT/ajaxrecipes/dhtml/validation/test.html <html> <head> <title>Validation Example</title> <script language="JavaScript" src="/scripts/jaxson/common.js"></script> <script language="JavaScript" src="/scripts/jaxson/converter.js"></script> </head> <body> <form id="calculator"> <table border="1"> <tr> <td>Number 1</td><td><input type="text" name="Number1" /></td> </tr> <tr> <td>Number 2</td><td><input type="text" name="Number2" /></td> </tr> <tr> <td>Result</td><td><span id="result"></span></td> </tr> <tr> <td colspan="2"> <center> <input type="button" value="Add the two numbers" onclick=""/> </center> </td> </tr> </table> </form> </body></html> Notice that the form HTML element defines only the id attribute and not the method and action attributes. This is done on purpose, as you ll see in the recipe Don t Submit Your Forms Ajax Them presented in 8. The form uses standard form elements, such as the input button and the input text box. The purpose of the form HTML element is to define a block that contains all of the elements and represents a valid state. In the example, the valid elements include the fields Number1 and Number2. The form block contains a span element that represents the result of the addition. When submitting forms using the browser-based HTML POST, you re sending all of the form elements (such as Number1 and Number2) to the server. When the POST returns, the result returns. In the example HTML, the result is a span element, which is assigned by JavaScript. Imagine if the result element were an HTML form; using an HTML POST would cause the result to be sent to the server. Sending the state of the result is incorrect, because you re sending output data in an input state. The form example illustrates that there are multiple states and multiple representations of the state. You separate the input state and output state using multiple representations, which is the basis of the Representation Morphing pattern.1
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1. Christian Gross, Ajax Patterns and Best Practices (Berkeley, CA: Apress, 2006), p. 197.
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In a nutshell, the Representation Morphing pattern says that state can have multiple representations. A representation exposes a way to extract and assign a state. If the representation changes, the state does not. A decoupling of representation and state is possible. In the calculator example, this means that the form has two representations: the numbers and the result. The representation is responsible for how it presents the state. Figure 3-3 illustrates the Representation Morphing pattern.
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Figure 3-3. Applying the Representation Morphing pattern when adding two numbers
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Figure 3-3 shows two referenced representations: Number and Result. Each of the representations has associated two methods: GetState and SetState. The purpose of the methods is to extract and assign state to a representation. In programmatic terms, the representations and the associated methods represent a contract. Notice that it has not been mentioned how the data is retrieved from the server. This is important, because it illustrates that the representation is not dependent on how it receives its data. The architecture cannot be directly implemented as illustrated in Figure 3-3, because HTML considers everything as a single namespace. Thus, if one script defines a function, another script cannot define the same function. In the architecture of Figure 3-3, there are two instances of GetState and SetState. The Representation Morphing pattern solves the problem by associating the state methods with the HTML blocks. In the code example, that means associating state methods to the form and to the span element.
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Another solution is to create the global functions GetState and SetState but associate identifiers with the global functions. These global functions are responsible for retrieving or assigning the state with the representation. The advantage of this approach is that you have a centralized location that you can extend or maintain. Going back to the first code segment of this recipe, adding the global functions GetState and SetState results in the following code. Source: /website/ROOT/ajaxrecipes/dhtml/validation/test.html <html> <head> <title>Validation Example</title> <script language="JavaScript" src="/scripts/jaxson/common.js"></script> <script language="JavaScript" src="/scripts/jaxson/converter.js"></script> </head> <script language="JavaScript" type="text/javascript"> function GetState(identifier, cb) { } function SetState(identifier, obj, cb) { } </script> <body> <form id="calculator"> <table border="1"> <tr> <td>Number 1</td><td><input type="text" name="Number1" /></td> </tr> <tr> <td>Number 2</td><td><input type="text" name="Number2" /></td> </tr> <tr> <td>Result</td><td><span id="result"></span></td> </tr> <tr> <td colspan="2"> <center> <input type="button" value="Add the two numbers" onclick=""/> </center> </td> </tr> </table> </form> </body></html>
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