a.js

computeElementsPositions = () ->
		elements = new Array()
		padding = parseInt $('body').css('paddingTop')
		console.log 'computing elements with body padding of '+padding
		$('.witness').remove()
		$('[data-pid]').each () ->
			$this = $(this)
			pid = $this.attr("data-pid")
			pos = $this.offset().top - padding
			witness = $('<div class="witness">' + pid + ':' + pos + '</div>')
			witness.css 
				top             : pos
				position        : "absolute"
				width           : "100%"
				"border-top" : "solid 1px red "
			$('body').append witness
			elements.push
				'elem': $this
				'pid' : pid
				'pos' : pos
		$scope.elements = elements