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CHAPTER 6 DECOUPLED NAVIGATION PATTERN
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Figure 6-2. HTML page structure with respect to a search engine In Figure 6-2, the links of Figure 6-1 have been explicitly highlighted and illustrate that most HTML pages have a multitude of links. A search engine sees many more links than we realize. The point is that links have changed in their nature, complexity, and sheer number. Figure 6-3 illustrates a more complicated GUI with links that do more than provide a way to navigate content as a classical link does.
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CHAPTER 6 DECOUPLED NAVIGATION PATTERN
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Figure 6-3. More-complicated HTML page structure Figure 6-3 shows three types of links: classical, user interaction, and dynamic GUI. A classical link has already been explained. A user interaction link is used when the result of content navigation depends on what the user provides as data. In Figure 6-3, the user interaction link is a text box used to define a query that executes a search. The results of the search depend on the content of the query string. The dynamic GUI link is a short-circuited link that when clicked will execute some logic resulting in the navigation of content, generation of images, or some other visual effect. Figures 6-1 and 6-2 show links of the traditional or initial Web, and Figure 6-3 shows links of the modern Web. The modern Web has changed what it means to navigate content, in that information is navigated. Navigating information is more complicated because determining what information is navigated requires client-side logic. In Figure 6-3, not all links are created equal from a logic perspective. Some links are more complicated, and that is the focus of the Decoupled Navigation pattern. Figure 6-4 dissects the HTML content of Figure 6-3 into individual content chunks.
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CHAPTER 6 DECOUPLED NAVIGATION PATTERN
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Figure 6-4. Dissected functionality of HTML page This HTML page has three types of content chunks: searching, mapping, and contextual. The content chunks are not and do not need to be independent of each other. In Figure 6-4, the contextual information is generated based on what is displayed in the mapping chunk. And the searching chunk, when executed, generates content for the mapping and contextual chunks. What is interesting about these chunks is that they are related, because each chunk generates links that depend on the context of the content in the other chunk.
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The Decoupled Navigation pattern is used when content is navigated. The statement is obtuse and does not really say anything because HTML content is always navigated. However, because of the way Dynamic HTML is used, content navigation is sometimes used to generate an effect. When links are used to generate effects, the Decoupled Navigation pattern does not apply. To clarify this explanation, Figure 6-5 provides a snapshot of a website that illustrates where the Decoupled Navigation pattern is applicable and not applicable.
CHAPTER 6 DECOUPLED NAVIGATION PATTERN
E B V N Figure 6-5. Applicable and not applicable scenarios of the Decoupled Navigation pattern
The individual scenarios are explained as follows: 1. Inapplicable: The link is inapplicable because it references another link that wishes to start a new context unrelated to the current content. This scenario is comparable to when a user runs one application and then starts another application. 2. Inapplicable: The pop-up dialog box has a title bar that in some cases allows the pop-up to be dragged by using a mouse. The act of dragging is purely a user interface action that at the technical level uses HTML events and navigation techniques. 3. Applicable: The link referenced in the pop-up dialog box is visually identical to scenario 1, but when clicked the actions are not. This link-click is caught as an event and processed by using a JavaScript function. The JavaScript function processes the link context and loads content that relates to the context. In a sense, this scenario and the first scenario are related because under normal circumstances the referenced content is unrelated to the current content. The difference is that the JavaScript function intelligently decides what should be loaded, thus relating the current context to the new context. 4. Inapplicable: The link referenced by this scenario is an HTML form. By its nature an HTML form is designed to change contexts and replace the old context with a new context. However, HTML forms can function like the link in scenario 3. To make this scenario applicable, the form event onsubmit would need to be processed.
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