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Code Block

	java
	java

public class Login
{
    @Persist
    @Property
    private String userName;

    @Property
    private String password;

    @Inject
    private UserAuthenticator authenticator;

    @InjectComponent(id = "password")
    private PasswordField passwordField;

    @Component
    private Form form;

    /**
     * Do the cross-field validation
     */
    void onValidateFromFormonValidateFromLoginForm()
    {
        if (!authenticator.isValid(userName, password))
        {
            // record an error, and thereby prevent Tapestry from emitting a "success" event
            form.recordError(passwordField, "Invalid user name or password.");
        }
    }

    /**
     * Validation passed, so we'll go to the "PostLogin" page
     */
    Object onSuccess()
    {
        return PostLogin.class;
    }
}

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Validator	Constraint Type	Description	Example
email	–	Ensures that the given input looks like a valid e-mail address	`<t:textfield value="email" validate="email" />`
max	long	Enforces a maximum integer value	`<t:textfield value="age" validate="max=120,min=0" />`
maxLength	int	Makes sure that a string value has a maximum length	`<t:textfield value="zip" validate="maxlength=7" />`
min	long	Enforces a minimum integer value	`<t:textfield value="age" validate="max=120,min=0" />`
minLength	int	Makes sure that a string value has a minimum length	`<t:textfield value="somefield" validate="minlength=1" />`
none	–	Does nothing (used to override a @Validate annotation)	`<t:textfield value="somefield" validate="none" />`
<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="d22f35ed1fe9dd96-3e7867bc-4a6145b5-98da8441-a2176dd39490d0a306de263c"><ac:plain-text-body><![CDATA[	regexp	pattern	Makes sure that a string value conforms to a given pattern	`<t:textfield value="letterfield" validate="regexp=^[A-Za-z]+$" />`	]]></ac:plain-text-body></ac:structured-macro>
required	–	Makes sure that a string value is not null and not the empty string	`<t:textfield value="name" validate="required" />`

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