var margin = {top: 20, right: 20, bottom: 30, left: 40},
width = 400 - margin.left - margin.right,
height = 400 - margin.top - margin.bottom;
var color = d3.scale.category10();
var data = [
{
"period":201409,
"type":"MONTH",
"amount":85.0
},
{
"period":201409,
"type":"ENTRY",
"amount":111.0
},
{
"period":201410,
"type":"MONTH",
"amount":85.0
},
{
"period":201410,
"type":"ENTRY",
"amount":55.0
}
];
var x = d3.scale.ordinal().rangeRoundBands([0, width], .1, 0);
var y = d3.scale.linear().range([height, 0]);
var xAxis = d3.svg.axis()
.scale(x)
.orient("bottom");
var yAxis = d3.svg.axis()
.scale(y)
.orient("left").ticks(10);
var svg = d3.select("#chart")
.append("svg")
.attr("width", width + margin.left + margin.right)
.attr("height", height + margin.top + margin.bottom)
.append("g")
.attr("transform", "translate(" + margin.left + "," + margin.top + ")");
data.forEach(function(d) {
d["period"] = d["period"];
d["amount"] = +d["amount"];
d["type"] = d["type"];
});
var nest = d3.nest()
.key(function(d) { return d["type"];});
var dataByType = nest.entries(data);
//var max = d3.max(dataByGroup, function(d) { return d3.sum(d.values, function(e) { return e.values; }); })
//console.log("dataByGroup", dataByGroup);
var stack = d3.layout.stack()
.values(function(d) { return d.values; })
.x(function(d) { return d.period; })
.y(function(d) { return d.amount; })
.out(function(d, y0) {
d.valueOffset = y0;
});
//data: key: group element, values: values in each group
stack(dataByType);
var yMax = d3.max(dataByType, function(type) { return d3.max(type.values, function(d) { return d.amount + d.valueOffset; }); });
color.domain(dataByType[0].values.map(function(d) { return d.type; }));
x.domain(dataByType[0].values.map(function(d) { return d.period; }));
y.domain([0, yMax]);
svg.append("g")
.attr("class", "x axis")
.attr("transform", "translate(0," + height + ")")
.call(xAxis);
svg.append("g")
.attr("class", "y axis")
.call(yAxis)
.append("text")
.attr("transform", "rotate(-90)")
.attr("y", 3)
.attr("dy", ".71em")
.style("text-anchor", "end");
var selection = svg.selectAll(".group")
.data(dataByType)
.enter().append("g")
.attr("class", "group");
//.attr("transform", function(d) { return "translate(0," + y0(y0.domain()[0]) + ")"; });
selection.selectAll("rect")
.data(function (d) { return d.values; })
.enter().append("rect")
.attr("width", x.rangeBand())
.attr("x", function(d) { return x(d.period); })
.attr("y", function (d) { return y(d.amount + d.valueOffset); })
.attr("height", function (d) { return y(d.valueOffset) - y(d.valueOffset + d.amount); })
.style("fill", function (d) { return color(d.type); })
.style("stroke", "grey");
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.4.11/d3.min.js"></script>
<div id="chart"></div>