Question

can I validate two interdependent fields in with one validator?

     <h:form>
            <h:inputText value="#{logRegBean.person.name}" >
                <f:validator validatorId="loginCorrectValidator" />
            </h:inputText>
            <h:inputSecret value="#{logRegBean.person.password}" />
            <h:commandButton action="#{logRegBean.login}" />
        </h:form>

I want to search for the user in the DB and if there is the user, I’ll test if the passwords(in db and inputted) match. But how can I access even the password field in one validator? I tried to evaluate the value int the other field via createValueExpression(), but it looks like I can’t access the value in that time since I always get empty strings.

Answer 1

Best what you can do is to grab the other UIInput component by UIViewRoot#findComponent() inside the validate() method and then determine the submitted value by either UIInput#getSubmittedValue() (when it occurs after the currently validated component in the component tree) or UIInput#getValue() (when it occurs before the current component and thus is already validated).

E.g.

public void validate(FacesContext context, UIComponent component, Object value) throws ValidatorException {
    UIInput otherInput = (UIInput) context.getViewRoot().findComponent("clientId");
    String otherValue = (String) otherInput.getSubmittedValue();
    // ...
}

See also:

• JSF doesn't support cross-field validation, is there a workaround?