172 CHAPTER 6 DECOUPLED NAVIGATION PATTERN Of (Web server application)
172 CHAPTER 6 DECOUPLED NAVIGATION PATTERN Of course, it goes without saying that a good programming practice in the implementation of MonitorLinks would be to test whether the evt variable is null. This is because when the events are wired together by using programmatic terms, the first parameter may or may not be the event. Defining and Implementing the Common Data Functionality As outlined earlier in this chapter, the Common Data functionality requires defining a state and potentially some function that processes the state. When processing the state, the data may be locally processed or may involve some remote processing. If the state is processed remotely, a URL is involved and the process requires URL design. Therefore, this section presents materials relating to URL design. The Purpose of the State and State Manipulations 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. E B V N 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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