Say you want to make sure that a value is required.
<html xmlns:h="http://java.sun.com/jsf/html" xmlns:f="http://java.sun.com/jsf/core">
<h:inputText value="#{user.firstName}">
<f:validateRequired/>
</h:inputText>
</html>
If you want to disable the RequiredValidator on a page you can mark the validator as disabled as follows:
<html xmlns:h="http://java.sun.com/jsf/html" xmlns:f="http://java.sun.com/jsf/core">
<h:inputText value="#{user.firstName}">
<f:validateRequired disabled="true" />
</h:inputText>
</html>
If you keep an instance of a RequiredValidator around in your managed bean you can also use binding to bind that particular instance of the RequiredValidator to the tag on the page like so:
<html xmlns:h="http://java.sun.com/jsf/html" xmlns:f="http://java.sun.com/jsf/core">
<h:inputText value="#{user.firstName}">
<f:validateRequired binding="#{settings.requiredValidator}" />
</h:inputText>
</html>
And a managed bean that has a method similar to the one below:
public RequiredValidator getRequiredValidator() {
return requiredValidator;
}
If you specifically want to attach the validator to a specific component then you can use the 'for' attribute to target it. Note this attribute is really helpful when using composite components. Eg.
<html xmlns:h="http://java.sun.com/jsf/html" xmlns:f="http://java.sun.com/jsf/core">
<h:inputText id="myinput" value="#{donation.amount}">
<f:validateRequired binding="#{settings.firstNameValidator}" for="myinput"/>
</h:inputText>
</html>