AngularJS | Directive | Limits an input length by trimming exceeding characters

limit_length.coffee

'use strict'

app = angular.module 'app'

app.directive 'limitLength', ->
  require  : 'ngModel'
  restrict : 'A'
  link     : ($scope, element, attrs, ngModel) ->
    ngModel.$parsers.push (value) ->
      if !_.isEmpty(value) and value.length > attrs.limitLength
        value = ngModel.$modelValue
        ngModel.$setViewValue value
        ngModel.$render()
      value