JSF greater than zero validator
jsf, jsf-2
Solution
Just create a custom validator, i.e. a class implementing `javax.faces.validator.Validator`, and annotate it with `@FacesValidator("positiveNumberValidator")`.
Implement the `validate()` method like this:
@Override
public void validate(FacesContext context, UIComponent component,
Object value) throws ValidatorException {
try {
if (new BigDecimal(value.toString()).signum() < 1) {
FacesMessage msg = new FacesMessage("Validation failed.",
"Number must be strictly positive");
msg.setSeverity(FacesMessage.SEVERITY_ERROR);
throw new ValidatorException(msg);
}
} catch (NumberFormatException ex) {
FacesMessage msg = new FacesMessage("Validation failed.", "Not a number");
msg.setSeverity(FacesMessage.SEVERITY_ERROR);
throw new ValidatorException(msg);
}
}
And use it in the facelets page like this:
<h:inputText id="percentage" value="#{lab.percentage}">
<f:validator validatorId="positiveNumberValidator" />
</h:inputText>
Useful link: http://www.mkyong.com/jsf2/custom-validator-in-jsf-2-0/
Problem
How do you create a validator in JSF that validates the input text if it is greater than zero? ``` <h:inputText id="percentage" value="#{lab.percentage}"> <f:validateDoubleRange minimum="0.000000001"/> </h:inputText> ``` I have the code above but I am not sure if this is optimal. Although it works but if another number lesser than this is needed then I need to change the jsf file again. The use case is that anything that is greater than zero is okay but not negative number. Any thoughts?