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CHAPTER 6 DECOUPLED NAVIGATION PATTERN
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Use HTML event bubbling to process multiple similar elements as a collection; otherwise, associate single events with single elements. When processing multiple elements, using the id property is imperative; otherwise, problems may occur. Use HTML event bubbling to perform validation and verification, potentially stopping the sending of an HTML form. Note that not all events can be canceled, and not all events bubble. When an event does not bubble, the event occurs only on the HTML element responsible for the event. For cross-browser compatibility, consider using only the events listed in Table 6-1.
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Table 6-1. Cross-Browser Events and Their Bubble and Cancelable Status
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Bubbles
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No No Internet Explorer No Mozilla Yes Yes Yes No No Yes Yes Yes No Yes Yes Yes Yes Yes Yes No Yes Internet Explorer No Mozilla Yes No
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Cancel
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No No Internet Explorer Yes Mozilla No Yes Yes Yes No Yes Yes Yes No Yes No Yes Yes Yes No Yes No Yes No
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CHAPTER 6 DECOUPLED NAVIGATION PATTERN
Here are some rules of thumb for defining URLs: URLs are resources that represent components and should be treated as such. URLs are general, and with each identifier appended to the URL, more details about the component are exposed. Application logic is related to the URL, and orthogonal application logic is distinctly separated by using the URL. As defined by the Permutations pattern, resource URLs exist until the end of time, or at least for a very long time, allowing a resource URL to be considered hard-coded. Here are some rules of thumb about the Common Data functionality: Implementing the Common Data functionality means defining a common state structure that is shared by the Action, Common Data (functions that is), and Presentation functionalities. Implementing a common state structure is essential to decoupling the various functionalities from each other, making it possible to wire together predefined functionality. The common state structure should be decoupled from the functionalities by using classes and functions.
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Here are some rules of thumb about the Presentation functionality: The Presentation functionality does not encompass all aspects of the user interface. For example, the details of creating and moving a pop-up box are managed by the routines of the pop-up box. The Presentation functionality is responsible for indicating what data to present and when to present that data. All Presentation functionalities should be adapters for HTML components. You do not want to write your own pop-up boxes, menus, or other more sophisticated HTML user interface components. Intelligent individuals have already done a good job, and you should take advantage of their generosity and intelligence. When implementing a function to generate the user interface, focus on creating general code that can be reused in multiple contexts.
Representation Morphing Pattern
Intent
The Representation Morphing pattern is best described as a representation that implements a mini Model View Controller, where the model is a constant that can be substituted into other mini Model View Controllers. The uniqueness of this pattern is that the model, view, and controller are an all-in-one package. The result is a representation that is work-space oriented, allowing saving and reconstruction without having to use a large amount of JavaScript source code.
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Motivation
The motivation for using this pattern relates to the desire to improve the usability of web applications. Web applications are not traditional client applications and require their own coding techniques. When implementing web applications, some will attempt to assign traditional client programming functionalities when the correct solution would be to concentrate on the Web and what it offers. There are multiple types of web applications, two of which are informational and data gathering. Informational websites provide links and some HTML form elements to navigate the data. Search engines are an example of informational websites in which links and HTML form elements (for example, a text box) are used to navigate information. Figure 7-1 shows the Google search engine. The Google search engine has multiple HTML form elements (text box, buttons, and radio buttons) illustrating sophisticated features in a simple-to-use representation. Most people probably do not use any of the HTML form elements except for the text box. Usually you enter your data into the text box, hit the Enter key, and get a listing of search results.
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