How to validate if at least one of multiple input fields is entered?

Question

I have a form with 3 fields, and submit button. when button clicked, if none is entered in 3 fields, throw validation message. If any one of the 3 fields are entered process

Answer 1

Just let the required attribute of each field check the presence of the submitted value of the other fields. The submitted value is available in the parameter map #{param} by the client ID as key.

Here's a kickoff example:

It gets only more ugly as the amount of fields grows.

Alternatively, you can use OmniFaces :

Please note that performing validation in action method is bad design. You should use the standard JSF validation facilities for this such as requiered, validator, and/or .