An attempt to automatically scroll an svg when a d3 tree node is added

gistfile1.coffee

    _scrollContainer: ->
      targets = d3.select(d3.selectAll('g.node.selection').pop()).node()
      return unless targets
      selectionCoord = targets.pop().getBoundingClientRect()
      selectedTarget = d3.select('g.selected')
      selectedTarget = _.compact selectedTarget[0]
      return unless selectedTarget.length > 0
      selectedCoord = selectedTarget[0].getBoundingClientRect()

      bottomCoord = Math.max selectionCoord.bottom, selectedCoord.bottom
      topCoord = Math.min selectionCoord.top, selectedCoord.top

      scrollHeight = @$('#tree-container')[0].scrollHeight - @$('#tree-container').height()
      curScroll = @$('#tree-container').scrollTop()

      if topCoord < 100
        curScroll -= (topCoord + 100)
        return curScroll
      if bottomCoord > 340
        curScroll += (bottomCoord - 340)
      else
        return