I came across this article by Andre Guirard: http://www-10.lotus.com/ldd/bpmpblog.nsf/dx/better-ssjs-validation-for-xpages?opendocument&comments#anc1

 

What would be the best way to check for an empty field with this method? It seems as if nothing is entered into the field, nothing gets called. I'm a beginner to JavaScript...sorry if the answer is obvious. I've tried the if statement below, but nothing gets flagged.

 

              <xp:this.validate>
                      <![CDATA[#{javascript:
                        var val = value;
                        if (val == null)
                            postValidationError(this, "Field is required");
                        }]]>
              </xp:this.validate>