Java Reference
In-Depth Information
“
Using a Custom Validator
”
on page
132
explains how to use the custom validator tag on
the page.
Using a Custom Validator
To register a custom validator on a component, you must do one of the following:
• Nest the validator's custom tag inside the tag of the component whose value you
want to be validated.
• Nest the standard
f:validator
tag within the tag of the component and refer-
ence the custom
Validator
implementation from the
f:validator
tag.
Here is a hypothetical custom
formatValidator
tag for the Credit Card Number field,
nested within the
h:inputText
tag:
<h:inputText id="ccno" size="19"
...
required="true">
<mystore:formatValidator
formatPatterns="9999999999999999|9999 9999 9999
9999|9999-9999-9999-9999" />
</h:inputText>
<h:message styleClass="validationMessage" for="ccno"/>
This tag validates the input of the
ccno
field against the patterns defined by the page au-
thor in the
formatPatterns
attribute.
You can use the same custom validator for any similar component by simply nesting the
custom validator tag within the component tag.
If the application developer who created the custom validator prefers to configure the at-
tributes in the
Validator
implementation rather than allow the page author to configure
the attributes from the page, the developer will not create a custom tag for use with the
validator.
In this case, the page author must nest the
f:validator
tag inside the tag of the com-
ponent whose data needs to be validated. Then the page author needs to do one of the
following:
• Set the
f:validator
tag's
validatorId
attribute to the ID of the validator
that is defined in the application configuration resource file.
