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Figure 7-23. Attendee Register page (register.html)

Finally, the presentation tier generates an updated view of the shopping cart (step 6). The results of the execution are wrapped up by generating an HTML (Hypertext Markup Language) web page that is returned to the visitor (step 7), where the updated shopping cart can be seen in the visitor s web browser. Note that in this simple example, the business tier doesn t do a lot of processing, and its business logic isn t very complex. However, if new business rules appear for your application, you would change the business tier. If, for example, the business logic specified that a product could only be added to the shopping cart if its quantity in stock was greater than zero, an additional data tier call would have been made to determine the quantity. The data tier would only be requested to update the shopping cart if products are in stock. In any case, the presentation tier is informed about the status and provides human-readable feedback to the visitor.

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One of the AJAX features that we want to accomplish on the Register page is to use the autocomplete effect to allow users to partially enter a ZIP code and have a list of matches appear in a drop-down menu. Once they select a ZIP code, the city and state corresponding to the selected ZIP code should appear in their respective fields. The other feature of the Register page is dynamic user input validation. In a typical nonAJAX application, the user will enter data in the form and submit the form to the server for validation. If errors exist, the new page rendered will contain error messages or some kind of indicator as to what fields are in error. The goal for the Register page is to use Tacos components to submit the form data asynchronously and update the display dynamically to show any errors. To display the errors on the page, we need a specific portion of the page to serve as the container for the error messages. To accomplish this, we can create a simple custom component to render error messages.

Qt provides a class hierarchy for models that are a little different than what you may have encountered on other platforms. While you can use a model with a single flat collection of objects such as a list, the Qt platform itself provides for a tree of twodimensional tables such as the one you see in Figure 4 2. In the figure, we see a tree with a root that is a 4x4 table of items; the items at (0, 0) and (1, 3) each have child data, and so forth. While dizzying, this general representation provides the ability for a model to represent items in one dimension (lists), two dimensions (tables), and a hierarchy (such as a directory tree).

It s interesting to note how each tier interprets the same piece of information differently. For the data tier, the numbers and information it stores have no significance because this tier is an engine that saves, manages, and retrieves numbers, strings, or other data types not product quantities or product names. In the context of the previous example, a product quantity of 0 represents a simple, plain number without any meaning to the data tier (it is simply 0, a 32-bit integer). The data gains significance when the business tier reads it. When the business tier asks the data tier for a product quantity and gets a 0 result, this is interpreted by the business tier as Hey, no products in stock! This data is finally wrapped in a nice, visual form by the presentation tier, such as a label reading, Sorry, at the moment the product cannot be ordered. Even if it s unlikely that you want to forbid a customer from adding a product to the shopping cart if the product is not in stock, the example (described in Figure 2-3) is good enough to present in yet another way how each of the three tiers has a different purpose.

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