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<!-- User Service --> <inject property="userService" object="service:app.UserService"/> To inject the DynaDTO builder factory, we need to first define it in the hivemodule.xml file as follows: <!-- =================================================================== --> <!-- DynaDTO Builder Factory --> <!-- =================================================================== --> <service-point id="DynaBuilderFactory" interface="org.dynadto.BuilderFactory"> <invoke-factory service-id="app.JndiLookupFactory"> <construct resource="java:/dynadto/BuilderFactory" /> </invoke-factory> </service-point> The service point app.JndiLookupFactory is another custom HiveMind service created for the TechConf application that, similar to the EJB3Factory, does a simple JNDI lookup to return an object. Since the DynaDTO builder factory is available in the JNDI tree as shown in 5, we can use this HiveMind service to locate it. In the Register page definition we inject the builderFactory property as follows: <inject property="builderFactory" object="service:app.DynaBuilderFactory"/> In the page definition for the Register page, we define the components for the fields and labels used in the HTML template and any validation required. The simplest type of validator is the required validation which is shown in Listing 7-33. Listing 7-33. Simple Field Validation in the Register Page Specification <!-- First Name --> <component id="firstName" type="TextField"> <binding name="value" value="ognl:user.firstName"/> <binding name="validators" value="validators:required"/> <binding name="displayName" value="literal:First Name"/> </component> <component id="firstNameLabel" type="FieldLabel"> <binding name="field" value="component:firstName"/> </component> Tapestry includes other specific validators such an email validator. Listing 7-34 shows the component definition for the email field of the form. The email validator takes as a parameter a message that will be displayed (by the validation delegate). Validator messages are enclosed in square brackets.

Note If you don t get the expected output, make sure your machine is configured correctly and all PHP required modules, such as PDO, were loaded successfully. Many errors will be reported in the Apache error log file (by default, Apache2/logs/error.log).

If the page worked as expected from the start, you re certainly one lucky programmer! Most of the time, errors happen because of typos, so watch out for them! Database access problems are also common, so make sure you correctly configured the hatshop database and the hatshopadmin user, as shown in 2. In any case, we re lucky to have a good error-reporting mechanism, which shows a detailed error report if something goes wrong. Figure 3-15 shows the error message I received when mistyping the database password in config.php.

QStringListModel model; QModelIndex index = model->createIndex(0); QString anEntry("hello world"); QString datum = model->setData(index, QVariant(anEntry), Qt::DisplayRole);

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Listing 7-34. Format and Length Field Validation in the Register Page Specification <!-- Email --> <component id="email" type="TextField"> <binding name="value" value="ognl:user.email"/> <binding name="validators" value="validators:required,email[You must enter a valid email]"/> <binding name="displayName" value="literal:Email"/> </component> ... <!-- Password --> <component id="password" type="TextField"> <binding name="value" value="ognl:user.password"/> <binding name="validators" value="validators:required,maxLength=16[You must enter a password no longer than 16 characters]"/> <binding name="displayName" value="literal:Password"/> <binding name="hidden" value="true"/> </component> Finally, in the page specification we need to declare the bean with id delegate used in the AjaxForm delegate attribute. The default validation delegate class is org.apache.tapestry.valid. ValidationDelegate. See Listing 7-35. Listing 7-35. Format and Length Field Validation in the Register Page Specification <!-- Delegate to do the validation --> <bean name="delegate" class="org.apache.tapestry.valid.ValidationDelegate" property="delegate"/> Figure 7-24 shows the result of pressing Enter in the First Name input field. In this case the form gets submitted using an AJAX request, and the error message is displayed dynamically using the yellow fade effect , which is a popular technique for letting users know that something has changed on a page.

Figure 3-15. The error-handling code you ve written in 2 is helpful for debugging. If everything goes right, however, you ll get the neat page containing a list of departments generated using a Smarty template. Each department name in the list is a link to the department s page, which in fact is a link to the index.php page with a DepartmentID parameter in the query string that specifies which department was selected. Here s an example of such a link: http://localhost/hatshop/index.php DepartmentID=3 When clicking a department s link, the selected department will be displayed using a different CSS style in the list (see Figure 3-16).

Figure 3-16. Selecting a department It is important to understand how the Smarty template file (presentation/templates/ departments_list.tpl) and its associated plugin file (presentation/smarty_plugins/

Figure 7-24. AJAX field validation in action The field validation messages appear from top to bottom, one at a time. As you correct an error, the error disappears with a fade effect, and the next error from top to bottom is displayed (if there are any errors remaining on the form). Submitting the form by clicking the Submit button uses the ErrorDisplay component to display the error messages. The validation delegate also decorates the fields in error by changing the color of the field labels and adding two asterisks next to the field. Figure 7-25 shows the result of submitting the form with only the First Name and Last Name fields completed and an error in the syntax of the email field (two @ signs back).

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