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Code Block

	java
	java

public class Login
{
    @Persist
    private String userName;

    private String password;

    @Inject
    private UserAuthenticator authenticator;

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

    @Component
    private Form form;

    String onSuccess/**
     * Do the cross-field validation
     */
    void onValidateFromLoginForm()
    {
        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.");
Invalid user name or password.");
        }
    }

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

    public String getPassword()
    {
        return password;
    }

    public void setPassword(String password)
    {
        password = password;
    }

    public String getUserName()
    {
        return userName;
    }

    public void setUserName(String userName)
    {
        userName = userName;
    }
}

Wiki Markup

{float:right|width=40%}
{info}
Note that the onValidateFromLoginForm() and onSuccess() methodmethods isare not public; event handler methods can have any visibility, even private. Package private (that is, no modifier) is the typical use, as it allows the component to be tested, from a test case class in the same package.
{info}
{float}

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Code Block

	html
	html

<html xmlns:t="http://tapestry.apache.org/schema/tapestry_5_1_0.xsd">
    <head>
        <title>Login</title>
    </head>
    <body>
        <h1>Please Login</h1>

        <form t:type="form" t:id="formloginForm">

            <t:errors/>

            <t:label for="userName"/>:
            <input t:type="TextField" t:id="userName" t:validate="required,minlength=3" size="30"/>
            <br/>
            <t:label for="password"/>:
            <input t:type="PasswordField" t:id="password" t:validate="required,minlength=3" size="30"/>
            <br/>
            <input type="submit" value="Login"/>
        </form>
    </body>
</html>

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Validator	Constraint Type	Description	Example
email		Ensures that the given input is 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" />`
<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="9579a100fddab672-d4094c77-49bb4048-976bb8dc-4bc42cf010fa4a4a40932610"><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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