window.setTimeout(function() {
    var max = d3.max(d3.selectAll(".node")[0], function(g) {
      return d3.transform(d3.select(g).attr("transform")).translate[1];
    });
    //set the max of the group
    d3.select("svg").attr("height", max + 100)
    console.log(max)
  }, 800)//execute after 800 milliseconds after the update.