OmniFaces equivalent of Seam <s:validateForm> to validate multiple fields - validation

Question

in seam faces is option of a validation of a whole form.
I can import:
xmlns:s="http://jboss.org/seam/faces"
and use:
<s:validateForm validatorId="oneOrMorePrimaryIndicesValidator"/>
Now we have to use omnifaces instead of seamfaces.
Is there any equivalent in omnifaces that do similar job?

Answer 1

Depends on the concrete functional requirement which isn't entirely clear from the question.
If you want to validate if one or more fields are filled out, use existing <o:validateOneOrMore>:
<o:validateOneOrMore components="foo bar baz" />
<h:inputText id="foo" />
<h:inputText id="bar" />
<h:inputText id="baz" />
Or, if you want to implement a custom validator for multiple fields, use <o:validateMultiple>:
<o:validateMultiple components="foo bar baz" validator="#{oneOrMorePrimaryIndicesValidator}" />
<h:inputText id="foo" />
<h:inputText id="bar" />
<h:inputText id="baz" />
Whereby #{oneOrMorePrimaryIndicesValidator} refers a managed bean (can be either JSF or CDI) which implements MultiFieldValidator:
#Named
#RequestScoped // Can also be #ApplicationScoped, depending on if validator should hold state.
public class OneOrMorePrimaryIndicesValidator implements MultiFieldValidator {
#Override
public boolean validateValues(FacesContext context, List<UIInput> components, List<Object> values) {
// ...
}
}
It should return false if values are invalid, otherwise true.
Either way, general usage instructions on e.g. components, message, invalidateAll and showMessageFor attributes can be found in ValidateMultipleFields javadoc.
A completely different alternative is to use <o:validateBean> with JSR303 bean validation groups to validate an entity at class level with a JSR303 ConstraintValidator<SomeGroupAnnotation, Bean>. Such a validator is not only useable in JSF (the web tier), but also in e.g. JPA (the data tier). E.g.
<h:inputText value="#{bean.entity.foo}" />
<h:inputText value="#{bean.entity.bar}" />
<h:inputText value="#{bean.entity.baz}" />
<o:validateBean value="#{bean.entity}" validationGroups="com.example.SomeGroup" />
A more concrete example is hard to give without having concrete code of current model and validator at hands.