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Re:Show HN: FieldVal.js – JavaScript Validation Library by marcuslongmuir on Monday January 26, 2015 @03:59PM (#8949531)
How's this?: http://codepen.io/MarcusLongmuir/pen/rawRKR

You could also write a custom check that used the previous result as documented here: http://www.fieldval.com/docs/fieldval/Check%20Functions

Re:Show HN: FieldVal.js – JavaScript Validation Library by cmpb on Wednesday January 28, 2015 @06:50PM (#8963369)
That's pretty slick. I'll put this library in my back pocket for later.