Small Coffee class allowing to register click on anywhere but selector

global_click.coffee

@GlobalClick =

  initialize: () ->
    this.items    = {}
    this.elements = {}
    
    $('body').click (event) -> GlobalClick.perform(event)
  
  bind: (selector, action) ->
    this.items[selector] = action
    this.elements[selector] = []
    
    $(selector).each (i) ->
      GlobalClick.elements[selector].push this
  
  perform: (event) ->
    target    = event.target
    is_parent = this.is_parent
    
    for selector, action of this.items 
      do (selector, action) ->
        for element in GlobalClick.elements[selector]
          if !(target == element || is_parent(element, target))
            action(event.target, element)
        
  is_parent: (parent, child) ->
    node = child.parentNode

    loop
      break if node == null
      return true if node == parent
      node = node.parentNode

    return false