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Figure 7-1. Example data gathering web application A data-gathering web application is different in that the HTML elements are used to assemble data for reference purposes. Consider the data-gathering application illustrated in Figure 7-2. In this data-gathering web application, all of the pieces of information are gathered by using HTML form elements. In Figure 7-2, all of the HTML elements are text boxes, which are compact and visually pleasing, but ill-suited for data entry. Two of the text boxes are incorrectly formatted and illustrate a fundamental problem. The topmost text box is too big for the task of entering the title of the message. The second text box, on the other hand, is completely undersized for entering the message that will be sent. If the message causes scroll bars to appear, the little room that is available becomes even less. For any larger amounts of text, a user needs to constantly scroll from side to side or up and down. Users would be better off writing the text in another application and then copying the text into the text box.
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Figure 7-2. Example data-gathering web application1 The HTML form has an editing problem, and two factors are largely responsible: bad userinterface design, and not knowing how to deal with HTML forms. In contrast, Figure 7-3 illustrates how HTML can be organized to be both visually attractive and data-entry effective. In Figure 7-3, Slashdot presents a very simple user interface that has a single-line text field for the subject and a generous text area for the comments. This is a good example of how to write a data-gathering application. However, there is a catch in that a well-organized HTML form takes a larger amount of screen real estate.
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1. For those wondering, I sent a message to the Zurich regional government indicating how a pet collar that has GPS and cellphone capabilities could be used to control dogs such as pit bulls without resorting to drastic measures. This is a concern in Europe (also in other places such as the US) as fighting dogs have been responsible for many child deaths and critical injuries.
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Figure 7-3. A properly formatted text box
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This leads us to the question of whether it is even possible to write a compact and effective HTML form. And if it is not possible, does this mean web applications are ill-suited for data gathering and better suited for navigation The answer lies in a change in thinking, where HTML offers capabilities that are beyond the reach of other technologies. Traditional user interfaces generally have predefined windows and dialog boxes, and are very static in nature (not dynamic). A traditional user interface application does not generate user interface elements dynamically from a few pieces of information. Traditional user interfaces are a what you see is what you get type of programming environment. Dynamic HTML, on the other hand, makes it possible to define the user interface as the application is being executed. It is possible to do the same sort of thing with traditional programming environments, but the effort required is not insignificant. Static user interfaces are the result of creating a component that is a single block manipulated by a programming language. Figure 7-4 illustrates such a component, which is a combo box used to specify and purchase a plane ticket. Figure 7-4 shows a combo box that when clicked will expose a list of available times that a person wants to fly. The combo box displays all available hours and is large enough to accommodate a large number of times with the least amount of scrolling required. The combo box is functional and represents the data in a format that JavaScript and a server application can easily process. Some developers consider this sort of user interface as being developer-convenient but user-inconvenient.
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