Show HN: FieldVal.js – JavaScript Validation Library Posted by marcuslongmuir on Sunday January 25, 2015 @01:59PM from the show-hn dept. http://www.minoblog.io/fieldval/ ( 4 comments | 19 points | on HN )
E.g., birth_month required if birth_year is set and after a certain year.
You could also write a custom check that used the previous result as documented here: http://www.fieldval.com/docs/fieldval/Check%20Functions