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Instead, if you have a list of items with different data per item say, a list of location names with latitudes and longitudes each location is a single item in a list To provide access to different facets of a single item, Qt provides roles A role is a constant in an enumeration, and models return different data depending on the role you pass when you interrogate the model Qt defines several roles by default defined by the Qt::ItemDataRole enumeration, including: Qt::DisplayRole, indicating the primary visible facet of a datum Qt::DecorationRole, indicating a decoration (such as an icon) for a datum Qt::EditRole, indicating the primary editable facet of a datum Qt::SizeHintRole, indicating the desired size of the item for display layout purposes (this is the size the layout will try to accommodate, rather than the actual object s size).

{ // Build SQL query $sql = 'SELECT * FROM catalog_get_departments_list();'; // Prepare the statement with PDO-specific functionality $result = DatabaseHandler::Prepare($sql); // Execute the query and return the results return DatabaseHandler::GetAll($result); } } Because it relies on the functionality you ve already included in the DatabaseHandler class and in the database functions in place, the code in Catalog is very simple and straightforward. The GetDepartments method will be called from the presentation tier, which will display the returned data to the visitor. It starts by preparing the SQL query (you learned earlier about the advantages of preparing SQL statements), and then calling the appropriate DatabaseHandler method to execute the query. In this case, we re calling GetAll to retrieve the list of departments. Right now, the database connection is opened when index.php starts processing and is closed at the end. All database operations that happen in one iteration of this file will be done through this connection.

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The HTML template for the registration page is shown in Listing 7-30. Like other conference pages, it uses the ConferenceBorder component previously created. At the very top of the template we place an instance of the ErrorDisplay component created in the previous section. Listing 7-30. Register Page HTML Template <html jwcid="@ConferenceBorder" title="Register"> <span jwcid="@ErrorDisplay" delegate="bean:delegate"/> <form jwcid="@tacos:AjaxForm" delegate="bean:delegate" listener="ognl:listeners.add"> ... </form> </html> In previous examples submitting user information we used the Tapestry Form component. Tacos provides its own form component called AjaxForm, which provides a form that can handle AJAX and DHTML effects. AjaxForm descends from Tapestry s Form, therefore they are used in nearly identical ways. The delegate attribute refers to the object to which the validation of the form is delegated. The delegate is a class implementing the IValidationDelegate interface. A validation delegate keeps track of the user input, and it s responsible for decorating form fields and field labels. The listener attribute determines the listener method that will be invoked when the form is submitted. Listing 7-31 shows a sample of the input fields and field labels in the form of the Register page. Listing 7-31. Register Page HTML Template <table width="100%" border="0" summary="register"> <tr> <td><span jwcid="firstNameLabel"><label>First Name</label></span></td> <td><span jwcid="firstName"><input type="text" alt="First Name" /></span></td> </tr>

Now that everything is in place in the other tiers, all you have to do is create the presentation tier part this is the final goal that we ve been aiming toward from the beginning. As shown at the beginning of this chapter, the departments list needs to look something like Figure 3-14, when the site is loaded in the browser.

Qt::CheckStateRole, indicating whether the item is marked in some way (say, a list item bearing a check mark) So, for example, the QListView uses the Qt::DisplayRole to indicate to the model what data is requested for display for each item You can define your own roles, too, if you need to represent different kinds of data and find the Qt roles limiting in the kind of data being represented; just be sure that your first role has a value greater than Qt::UserRole When you set or get data from a model, you do so using a QModelIndex that indicates which datum you re interacting with as well as Qt s QVariant class The QVariant class is a type-safe wrapper for most C++ and all Qt value types, including integers, floatingpoint numbers, and strings.

You implement this as a separate componentized template named departments_list made up of two files: the Smarty design template (templates/departments_list.tpl) and the Smarty plugin file (smarty_plugins/function.load_departments_list.php). An additional helper class called DepartmentsList will also be used. You ll then just include this componentized template in the main Smarty template (templates/index.tpl).

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