Image Load Notifier

image-notifier.coffee

module.exports = class LazyLoad
  constructor: (@el, @callback) ->
    if @is_loaded() then @after() else @listen()

  listen: ->
    @el.on 'load', (e) => @after()

  is_loaded: ->
    @loaded = @el.get(0).complete

  after: ->
    @loaded = true
    @el.addClass 'loaded'
    @callback @el

main.coffee

Notifier = require 'image-notifier'

$('img').each (index, el) ->
  Notifier $(el), (img) ->
    img.addClass 'loaded'
    # Or whatever else you want.