StackedAreaChartStep3

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<!DOCTYPE html>
<meta charset="utf-8">
<style type="text/css">

svg {
  font-family: "Helvetica Neue", Helvetica;
}

.line {
  fill: none;
  stroke: #000;
  stroke-width: 2px;
}

</style>
<body>
<script src="//d3js.org/d3.v3.min.js"></script>
<script>

var m = [20, 20, 30, 20],
    w = 960 - m[1] - m[3],
    h = 500 - m[0] - m[2];

var x,
    y;

var color = d3.scale.category10();

var svg = d3.select("body").append("svg")
    .attr("width", w + m[1] + m[3])
    .attr("height", h + m[0] + m[2])
  .append("g")
    .attr("transform", "translate(" + m[3] + "," + m[0] + ")");

var stocks,
    symbols;

// A line generator, for the dark stroke.
var line = d3.svg.line()
    .interpolate("basis")
    .x(function(d) { return x(d.date); })
    .y(function(d) { return y(d.price); });

// A line generator, for the dark stroke.
var axis = d3.svg.line()
    .interpolate("basis")
    .x(function(d) { return x(d.date); })
    .y(h);

// A area generator, for the dark stroke.
var area = d3.svg.area()
    .interpolate("basis")
    .x(function(d) { return x(d.date); })
    .y1(function(d) { return y(d.price); });

d3.csv("dataset.csv", function(data) {
  var parse = d3.time.format("%b %Y").parse;

// Nest stock values by symbol.
  symbols = d3.nest()
      .key(function(d) { return d.symbol; })
      .entries(stocks = data);

// Parse dates and numbers. We assume values are sorted by date.
  // Also compute the maximum price per symbol, needed for the y-domain.
  symbols.forEach(function(s) {
    s.values.forEach(function(d) { d.date = parse(d.date); d.price = +d.price; });
    s.maxPrice = d3.max(s.values, function(d) { return d.price; });
    s.sumPrice = d3.sum(s.values, function(d) { return d.price; });
  });

// Sort by maximum price, descending.
  symbols.sort(function(a, b) { return b.maxPrice - a.maxPrice; });

var g = svg.selectAll("g")
      .data(symbols)
    .enter().append("g")
      .attr("class", "symbol");

x = d3.time.scale().range([0, w - 60]);
  y = d3.scale.linear().range([h / 4 - 20, 0]);

// Compute the minimum and maximum date across symbols.
  x.domain([
    d3.min(symbols, function(d) { return d.values[0].date; }),
    d3.max(symbols, function(d) { return d.values[d.values.length - 1].date; })
  ]);

var g = svg.selectAll(".symbol")
	.attr("transform", function(d, i) { return "translate(0," + (i * h / 4 + 10) + ")"; });
  
  g.each(function(d) {
    var e = d3.select(this);
  });

function draw(k) {
    g.each(function(d) {
      var e = d3.select(this);
      y.domain([0, d.maxPrice]);

e.select("path")
          .attr("d", function(d) { return line(d.values.slice(0, k + 1)); });

});
  }

var k = 1, n = symbols[0].values.length;
  d3.timer(function() {

var g = svg.selectAll(".symbol");

area
      .y0(h / 4 - 20);

g.each(function(d) {
    y.domain([0, d.maxPrice]);

d3.select(this).selectAll(".area")
       .data(d3.range(3))
      	.enter().insert("path", ".line")
        .attr("class", "area");
  });

var g = svg.selectAll(".symbol");
  g.each(function(d) {
    y.domain([0, d.maxPrice]);

d3.select(this).selectAll(".area")
        .filter(function(d, i) { return !i; })
        .style("fill", color(d.key));
    
  });
  var stack = d3.layout.stack()
      .values(function(d) { return d.values; })
      .x(function(d) { return d.date; })
      .y(function(d) { return d.price; })
      .out(function(d, y0, y) { d.price0 = y0; })
      .order("reverse");

stack(symbols);

y
      .domain([0, d3.max(symbols[0].values.map(function(d) { return d.price + d.price0; }))])
      .range([h, 0]);

line
      .y(function(d) { return y(d.price0); });

area
      .y0(function(d) { return y(d.price0); })
      .y1(function(d) { return y(d.price0 + d.price); });

var t = svg.selectAll(".symbol").transition()
      .duration(0)
      .each("end", function() { d3.select(this).attr("transform", null); });

t.select("path.area") ///////////////
      .attr("d", function(d) { return area(d.values); });

t.select("path.line")
      .style("stroke-opacity", function(d, i) { return i < 3 ? 1e-6 : 1; })
      .attr("d", function(d) { return line(d.values); });

});
  
});

</script>

https://d3js.org/d3.v3.min.js