javascript - Bug in d3.js Stacked chart morphing -

i've created stacked chart animation/update app. there appears nan values being passed y , height variables. unsure wrong. if toggle data charts fill up.

jsfiddle

but problem may occur first in setting yaxis

                 svg.select("g.y")                   .transition()                     .duration(500)                       .call(methods.yaxis); 

it looks goes wrong in bar rect enter/exit code.

                //_morph bars                          var bar = stacks.selectall("rect")                     .data(function(d) {                         return d.blocks;                      });                  // enter                 bar.enter()                     .append("rect")                     .attr("class", "bar")                     .attr("y", function(d) { return methods.y(d.y1); })                     .attr("width", methods.x.rangeband())                     .style("fill", function(d) { return methods.color(d.name); });                  // update                 bar                     .attr("y", methods.height)                     .attr("height", initialheight)                     .attr("width", methods.x.rangeband())                     .transition()                     .duration(500)                     .attr("x", function(d) { return methods.x(d.label); })                     .attr("width", methods.x.rangeband())                     .attr("y", function(d) { return methods.y(d.y1); })                     .attr("height", function(d) { return methods.y(d.y0) - methods.y(d.y1); })                  // exit                 bar.exit()                     .transition()                     .duration(250)                     .attr("y", function(d) { return methods.y(d.y1); })                     .attr("height", function(d) { methods.y(d.y0) - methods.y(d.y1); })                     .remove();                   //__morph bars 

i've managed narrow down problem setdblock function.

it appears if chart has same set of data, takes on additional object parameters inside dblock obj.

http://jsfiddle.net/xnngu/44/

i'm not sure @ stage how clean up. have isolated via legend , function.

setdblocks: function(incomingdata){                         var data = incomingdata.slice(0);                          methods.color.domain(d3.keys(data[0]).filter(function(key) { return key !== "label"; }));                          data.foreach(function(d) {                             console.log("d", d);                              var y0 = 0;                              if(d["blocks"] == undefined){                                 d.blocks = methods.color.domain().map(function(name) {                                     var val = d[name];                                      if(isnan(val)){                                         val = 0;                                     }                                      return {name: name, values: val, y0: y0, y1: y0 += +val};                                 });                             }                              d.total = d.blocks[d.blocks.length - 1].y1;                         });                                      }