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The Purpose of the State and State Manipulations
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Some may perceive the Common Data functionality as unnecessary overhead. The Common Data functionality is a necessity, albeit (as described in the Applicability section) only when the Decoupled Navigation pattern is a necessity. The purpose of the Common Data functionality is to provide a wedge between the Action and Presentation functionalities, enabling a decoupling of functions. Consider Figure 6-11, which illustrates the steps that occur when an HTML button is clicked, generating an event that causes a JavaScript function to be called.
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Figure 6-11. Steps resulting from clicking a button Figure 6-11 represents the simple button click as two steps. The first step is the HTML event, which processes the mouse click. The second step is the content generation in the table row below the button. The content uses HTML injection by assigning the innerHTML property. From this simple example, there would be no need for the Common Data functionality because that would add an unnecessary layer.
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CHAPTER 6 DECOUPLED NAVIGATION PATTERN
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Let s continue building on this example. Imagine that the same user interface is used to make a remote call via the XMLHttpRequest object. Figure 6-12 illustrates the steps needed in the remote case.
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Figure 6-12. Steps resulting from clicking a button when using an extra XMLHttpRequest call Figure 6-12 shows an added step (step 2), in which a request is made by using the XMLHttpRequest object that then generates some data that is processed in step 3. Looking at Figures 6-11 and 6-12, you might be wondering where the need for the Common Data functionality is. The need arises because often an application is converted from the state depicted in Figure 6-11 to that in Figure 6-12, or vice versa. Implementing the conversion can require some major restructuring of the code, or a completely new implementation that needs to be tested and maintained. The Common Data functionality decouples the steps so that an application that executed as in Figure 6-11 could be converted without major surprises into an application that executes as in Figure 6-12. The intention is to decouple, allowing the fewest number of changes and yielding the largest user benefit. Consider the following code, which mimics the implementation of Figure 6-11: function OnClick( event) { document.getElementById( "myDiv").innerHTML = "data"; } The code is a problem because what was defined as two steps in Figure 6-11 is one step in technical terms. The code is a function with an implementation. The problems of the function OnClick are that the text identifier myDiv is hard-coded, and so is the assigned value data. Imagine that the assignment code is used in multiple places, and imagine that the text has to be converted to uppercase before doing the assignment. Then the code would have to be updated in multiple places.
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CHAPTER 6 DECOUPLED NAVIGATION PATTERN
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The solution is to decouple the steps of Figure 6-11, which was illustrated as a single piece of code, into two code pieces. The decoupled code would be as follows: function InjectHTML( elementId, text) { document.getElementById( elementId).innerHTML = text; } function OnClick( event) { InjectHTML( "myDiv", "data"); } There are now two functions (InjectHTML and OnClick). The function InjectHTML requires an element identifier and some text, and will perform an HTML injection. The function InjectHTML is a business-logic-specific implementation that operates on an HTML element reference defined by the client. The function OnClick reacts to the event and is responsible for gathering the data used to call the InjectHTML function. Each function has its responsibilities and each function is decoupled from the other. The only shared information is the data gathered by OnClick and processed by InjectHTML. Figure 6-11 has been implemented by using a decoupled solution, but now Figure 6-12 needs to be implemented. This means that an additional step of using the XMLHttpRequest object needs to be added. For simplicity, assume that the XMLHttpRequest object functionality is encapsulated in the function CallXMLHttpRequest, which accepts a single parameter. As the function CallXMLHttpRequest is used to gather information, the function is called by OnClick, and the returned data is passed to the InjectHTML function. The modified source code is as follows:
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