Raible's Wiki: ValidationAndListTapestry

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Implementing validation with Tapestry is quite simple. Rather than using a [TextField|http://jakarta.apache.org/tapestry/doc/ComponentReference/TextField.html] component, you use a [ValidField|http://jakarta.apache.org/tapestry/doc/ComponentReference/ValidField.html] components. The validation integration for the personForm.html page is already done by AppGen in the personForm.page. If you open web/pages/personForm.page, you should see the following XML. I've highlighted the portions that are relevant to validation.

Implementing validation with Tapestry is quite simple. All you need to do is configure a "validators" property on your [TextField|http://jakarta.apache.org/tapestry/doc/ComponentReference/TextField.html] components. The validation integration for the personForm.html page is already done by AppGen in the personForm.page. If you open web/pages/personForm.page, you should see the following XML.

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<pre>

<?xml version="1.0"?>

<!DOCTYPE page-specification PUBLIC

"-//Apache Software Foundation//Tapestry Specification 3.0//EN"

"http://jakarta.apache.org/tapestry/dtd/Tapestry_3_0.dtd">

<page-specification class="org.appfuse.webapp.action.PersonForm">

<set-property name="required" expression="true"/>

<set-property name="clientScriptingEnabled" expression="true"/>

</bean>

<property-specification name="person" type="org.appfuse.model.Person"/>

<property-specification name="personManager" type="org.appfuse.service.PersonManager">

global.appContext.getBean("personManager")

</property-specification>

<property-specification name="message" type="java.lang.String"/>

<message-binding name="displayName" key="person.firstName"/>

</component>

<message-binding name="displayName" key="person.lastName"/>

</component>

</page-specification>

</pre>

{{{<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE page-specification PUBLIC

"-//Apache Software Foundation//Tapestry Specification 4.0//EN"

"http://jakarta.apache.org/tapestry/dtd/Tapestry_4_0.dtd">

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<page-specification class="org.appfuse.webapp.action.PersonForm">

</component>

</component>

</component>

</page-specification>}}}

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There are a [number of different validators|http://jakarta.apache.org/tapestry/doc/ComponentReference/ValidField.html] you can use, this example just shows a way to validate Strings are entered. The userForm.page has examples of an EmailValidator and a PatternValidator. All input fields generated by AppGen are required by default. You can change this by modifying the extras/appgen/src/**/*_page.xdt files.

There are a [number of different validators|http://jakarta.apache.org/tapestry/UsersGuide/validation.html] you can use, this example just shows a way to validate Strings are entered. The userForm.page has examples of an EmailValidator and a PatternValidator. All input fields generated by AppGen are required by default. You can change this by modifying the extras/appgen/src/**/*_page.xdt files.

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if (getValidationDelegate().getHasErrors()) {

if (getDelegate().getHasErrors()) {

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Since validation is configured in the page-specification file (a.k.a. personForm.page), whenever a field uses the ValidField component, it will get validated. For those fields that don't have validation, make sure and use the @Label component for its label. Below is a non-validated field example from web/pages/userForm.html.

Since validation is configured in the page-specification file (a.k.a. personForm.page), whenever a field specifies a "validators" property. For those fields that don't have validation, make sure and use the @Label component for its label. Below is a non-validated field example from web/pages/userForm.html.

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import org.apache.tapestry.engine.RequestCycle;

import org.appfuse.service.Manager;

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import org.appfuse.service.PersonManager;

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import java.util.HashMap;

import java.util.Map;

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protected void setUp() throws Exception {

super.setUp();

page = (PersonList) getPage(PersonList.class);

protected void onSetUpBeforeTransaction() throws Exception {

super.onSetUpBeforeTransaction();

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page.setPersonManager((PersonManager) ctx.getBean("personManager"));

page.setRequestCycle(getCycle(request, response));

Map map = new HashMap();

map.put("personManager", (Manager) applicationContext.getBean("personManager"));

page = (PersonList) getPage(PersonList.class, map);

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protected void tearDown() throws Exception {

super.tearDown();

protected void onTearDownAfterTransaction() throws Exception {

super.onTearDownAfterTransaction();

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MockRequestCycle cycle = (MockRequestCycle) page.getRequestCycle();

cycle.addServiceParameter(new Long(1));

RequestCycle cycle = new MockRequestCycle();

cycle.setServiceParameters(new Object[] {new Long("1")});

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PageEvent event = new PageEvent(page, page.getRequestCycle());

page.pageBeginRender(event);

assertTrue(page.getPeople().size() >= 1);

assertTrue(page.getPersons().size() >= 1);

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Create src/web/**/action/PersonList.java. It should implement [PageRenderListener|http://jakarta.apache.org/tapestry/doc/api/org/apache/tapestry/event/PageRenderListener.html] and read as follows:

Create src/web/**/action/PersonList.java. It should implement [PageBeginRenderListener|http://jakarta.apache.org/tapestry/tapestry/apidocs/org/apache/tapestry/event/PageBeginRenderListener.html] and read as follows:

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import org.apache.tapestry.event.PageEvent;

import org.apache.tapestry.event.PageRenderListener;

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public abstract class PersonList extends BasePage implements PageRenderListener {

public abstract class PersonList extends BasePage {

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public abstract void setPersonManager(PersonManager manager);

public abstract List getPeople();

public abstract void setPeople(List people);

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public void pageBeginRender(PageEvent event) {

setPeople(getPersonManager().getPeople(null));

public List getPersons() {

return getPersonManager().getPeople();

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Object[] parameters = cycle.getServiceParameters();

Long id = (Long) parameters[0];

Object[] parameters = cycle.getListenerParameters();

Long personId = (Long) parameters[0];

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log.debug("fetching person with id: " + id);

log.debug("fetching person with personId: " + personId);

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Person person = getPersonManager().getPerson(id.toString());

Person person = getPersonManager().getPerson(personId);

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Change it in personList.page too:

{{{<property-specification name="people" type="java.util.List"/>}}}

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{{{<verifytitle description="display Main Menu" text=".*${mainMenu.title}.*" regex="true"/>}}}

{{{<verifyTitle description="display Main Menu" text=".*${mainMenu.title}.*" regex="true"/>}}}

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{{{{{{<verifytitle description="Person List appears if save successful" text=".*${personList.title}.*" regex="true"/>}}}}}}

{{{{{{<verifyTitle description="Person List appears if save successful" text=".*${personList.title}.*" regex="true"/>}}}}}}

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