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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>
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CHAPTER 7 TAPESTRY
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<tr> <td><span jwcid="lastNameLabel"><label>Last Name</label></span></td> <td><span jwcid="lastName"><input type="text" alt="Last Name" /></span></td> </tr> <tr> <td><span jwcid="emailLabel"><label>Email</label></span></td> <td><span jwcid="email"><input type="text" alt="Email" /></span></td> </tr> ... <tr> <td><span jwcid="cityLabel"><label>City</label></span></td> <td><span jwcid="city"><input type="text" alt="City" /></span></td> </tr> <tr> <td><span jwcid="stateLabel"><label>State</label></span></td> <td><span jwcid="state"><input type="text" alt="State" /></span></td> </tr> <tr> <td><span jwcid="zipCodeLabel"><label>ZipCode</label></span></td> <td><span class="auto_complete" jwcid="zipCode"/></td> </tr> <tr> <td><img jwcid="@ImageSubmit" image="asset:btn_submit" alt="Submit" src="../images/btn-submit.gif" /></td> </tr> </table>
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In the Java code, we need to handle the form submission and the creation of the objects used to hold the registration information. Since the EJB3 service methods that we will be interacting with take DTOs as parameters, we need an instance of the DynaDTO builder factory to create the necessary objects. Listing 7-32 shows the Java implementation of the Register page. In the pageBeginRender listener, we create and set the DTO objects that will carry the data from the form to the form listener all the way down to the EJB3 service. Listing 7-32. Register Page Implementation package com.integrallis.techconf.web.tapestry.pages.attendee; ... public abstract class Register extends ActiveConferencePage { /** DynaDTO builders */ private Builder attendeeBuilder = null; private Builder addressBuilder = null; ...
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public void pageBeginRender(PageEvent event) { super.pageBeginRender(event); if (getUser() == null) { // get the builders if necessary if (attendeeBuilder == null) { attendeeBuilder = getBuilderFactory() .getBuilder(AttendeeInfo.class); } if (addressBuilder == null) { addressBuilder = getBuilderFactory().getBuilder(AddressInfo.class); } // set the user/address empty DTOs if one is not already set setUser((AttendeeInfo)attendeeBuilder.build()); getUser().setAddress((AddressInfo) addressBuilder.build()); } } public String add(IRequestCycle cycle) { IValidationDelegate delegate = (IValidationDelegate)getBeans().getBean("delegate"); if (delegate.getHasErrors()) return null; // if it passes validation then register them setUser( getUserService().registerAttendee(getUser())); // back to the page return "attendee/Register"; } public abstract void setUser(AttendeeInfo i); public abstract AttendeeInfo getUser(); public abstract UserService getUserService(); public abstract BuilderFactory getBuilderFactory(); } The add method processes the form submission. It first checks the form for errors using the validation delegate, and if there are no errors, it uses the UserService to invoke the registerAttendee method passing the AttendeeInfo DTO populated with the form data.
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The Register page will use the UserService EJB3 service to attempt to register a new user and the DynaDTO builder to create the instance of the AttendeeInfo DTO (and the enclosed AddressInfo DTO). Therefore we need to make the service available to the page by injecting it in the page specification as shown next:
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CHAPTER 7 TAPESTRY
<!-- 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.
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