fork of alxhill's scrollspy.coffee at https://gist.github.com/alxhill/6886760 not sure why, but the original wasn't working for me when the scope model updated. spyElems[spy.id] was undefined for new elements at line 37 and caused scrollfix to break after a model change. am using v1.2.0-8336b3a also add a quick attribute to allow easy custom buf…

scrollspy.coffee

angular.module('jobFoundryDirectives').directive 'spy', ($location) ->
  restrict: "A"
  require: "^scrollSpy"
  link: (scope, elem, attrs, scrollSpy) ->
    attrs.spyClass ?= "current"

    elem.click ->
      scope.$apply ->
        $location.hash(attrs.spy)

    scrollSpy.addSpy
      id: attrs.spy
      in: -> elem.addClass attrs.spyClass,
      out: -> elem.removeClass attrs.spyClass

angular.module('jobFoundryDirectives').directive 'scrollSpy', ($window) ->
  restrict: 'A'
  controller: ($scope) ->
    $scope.spies = []
    @addSpy = (spyObj) -> $scope.spies.push spyObj
  link: (scope, elem, attrs) ->
    spyElems = {}
    topBuffer = if attrs.topBuffer then attrs.topBuffer else 0

    scope.$watchCollection 'spies', (spies) ->
      for spy in spies
        unless spyElems[spy.id]?
          spyElems[spy.id] = elem.find('#'+spy.id)

    $($window).scroll ->
      highlightSpy = null
      for spy in scope.spies
        spy.out()

        # the elem might not have been available when it was originally cached,
        # so we check again to get another element in case this one doesn't exist.
        if !spyElems[spy.id]? or spyElems[spy.id].length is 0
          spyElems[spy.id] = elem.find('#'+spy.id)

        # the element could still not exist, so we check first to avoid errors
        if spyElems[spy.id]? and spyElems[spy.id].length isnt 0
          if (pos = spyElems[spy.id].offset().top) - $window.scrollY <= topBuffer
            spy.pos = pos
            highlightSpy ?= spy
            if highlightSpy.pos < spy.pos
              highlightSpy = spy

      highlightSpy?.in()