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Comment: Added note about Tap 5.4 not redirecting after form validation failures

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Storing Data Between Requests

Wiki Markup
{float:right|background=#eee|width=40%}
{since:5.4}
Note: Starting in Tapestry 5.4, the default behavior for server-side validation failures is to re-render the page within the same request (rather than emitting a redirect). This removes the need to use a persistent field to store the tracker.
{since}
{float}

As with other action requests, the result of a form submission is to send a redirect to the client which re-renders the page. The ValidationTracker must be stored persistently between requests, or all the validation information will be lost (the default ValidationTracker provided by the Form is persistent).

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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="54804c2ff40712f2-72dacd15-48624685-9655af8c-453752abdf85ae2db316034d"><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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