jquery.valitito.coffee

jQuery.valitito = {}

jQuery.fn.valid = ->
  delete jQuery(@).data()['valid']
  jQuery(@).trigger('validate')
  if jQuery(@).find('input').length
    for input in jQuery(jQuery(@).find('input'))
      if !$(input).valid()
        jQuery(@).data('valid', false)
        break
  return true if jQuery(@).data('valid') == undefined
  !!jQuery(@).data('valid')

jQuery.fn.validate = (options)->
  if typeof options == 'function'
    options = {validator: options}
  if options?
    if options.validator?
      jQuery(document).on 'validate', jQuery(@).selector, (e) ->
        e.stopPropagation()
        jQuery(@).data('valid', options.validator.apply(@))
    if options.valid?
      jQuery(document).on 'valid', jQuery(@).selector, (e) ->
        e.stopPropagation()
        options.valid.apply(@)
    if options.invalid?
      jQuery(document).on 'invalid', jQuery(@).selector, (e)->
        e.stopPropagation()
        options.invalid.apply(@)
    jQuery(document).on 'focusout', jQuery(@).selector, (e)->
      return unless jQuery(@).is('input')
      jQuery(@).validate()
    jQuery(document).on 'keydown', jQuery(@).selector, (e)->
      return unless jQuery(@).is('input')
      if jQuery(@).valid()
        jQuery(@).trigger('valid')
      else
        jQuery(@).removeClass('pass').removeClass('fail')
  else
    jQuery(@).trigger('invalid') if !jQuery(@).valid()
    jQuery(@).trigger('valid') if jQuery(@).valid()

  jQuery(document).on 'submit', jQuery(@).selector, ->
    if jQuery(@).valid()
      if options.submit
        options.submit.apply(@)
    else
      if options.invalid
        options.invalid.apply(@)
    false

jQuery.fn.month = ->
  parsed_int = parseInt(jQuery(@).val().replace(/^0/, ''))
  array_position = jQuery.inArray(parsed_int, [1,2,3,4,5,6,7,8,9,10,11,12])
  array_position >= 0

jQuery.fn.year = ->
  value = jQuery(@).val()
  if "#{value}".length == 2
    year = "20#{value}"
  else
    year = "#{value}"
  year.match(/^[0-9]{4}$/) && parseInt(year) >= (new Date()).getFullYear()

jQuery.fn.number = ->
  parseInt(jQuery(@).val()) == +jQuery(@).val()

jQuery.fn.present = ->
  jQuery.trim(jQuery(@).val()) != ''

jQuery.fn.blank = ->
  jQuery.trim(jQuery(@).val()) == ''

jQuery.fn.greater_than = (value) ->
  parseInt(jQuery(@).val()) > value

jQuery.fn.email = ->
  jQuery(@).val().match(/^[^@]+@[^@]+\.[^@]*[^\.@]{1}$/)

jQuery.fn.less_than = (value)->
  if jQuery.trim(null)
    value = 0
  parseInt(jQuery(@).val()) < value

usage.coffee

$('input.form-control.required').validate
  validator: ->
    $(@).present()
  valid: ->
    $(@).addClass('pass').removeClass('fail')
  invalid: ->
    $(@).addClass('fail').removeClass('pass')

If you give parseInt a string with a leading 0, it's going to assume it's in base 8. You should pass in 10 as the radix, the second argument to parseInt. More info: https://coderwall.com/p/oyk_ea

Looks like you can skip that for the month & year parseInts though. Well, maybe you'll want it in the year one too.