How to invoke JSF validator on keyup event?

Question

I have implemented a JSF validator based on this example.

How can I trigger it on keyup event of ?

I am using JSF 2.0 and Richfaces

Answer 1

You can attach ajax listeners to DOM events on any JSF HTML input component by tag.

The fooValidator can be just a simple Validator implementation which you register in the faces context by @FacesValidator annotation.

@FacesValidator("fooValidator")
public class FooValidator implements Validator {

    @Override
    public void validate(FacesContext context, UIComponent component, Object value) throws ValidatorException {
        // ...

        if (invalid) {
            throw new ValidatorException(new FacesMessage("Fail!"));
        }
    }

}

See also:

• Communication in JSF 2 - Ajax validation

In RichFaces it's not much different. There's only the tag which is basically just on steroids. But it does not really provide additional benefits in this particular case. See also Is there any difference between f:ajax and a4j:ajax?