Basic stackedarea chart from wide input format

This post describes how to build a very basic stacked area chart with d3.js. Note that input dataset is at the wide (untidy) format: each group is provided in a specific column. See another basic example starting from long (tidy) format here. You can see many other examples in the stacked area chart section of the gallery.

Stacked area section


  • The Html part of the code just creates a div that will be modified by d3 later on.

  • The first part of the javascript code set a svg area. It specify the chart size and its margin. Read more.

  • Data is available here. Note the wide (untidy) format: each group is provided in a specific column.

  • To build a stacked area chart, data must be stacked, using the d3.stack() function.

  • Once the new coordinates are available, shapes can be added through path, using the d3.area() helper.
<!DOCTYPE html>
<meta charset="utf-8">

<!-- Load d3.js -->
<script src=""></script>

<!-- Create a div where the graph will take place -->
<div id="my_dataviz"></div>


// set the dimensions and margins of the graph
var margin = {top: 20, right: 30, bottom: 30, left: 55},
    width = 460 - margin.left - margin.right,
    height = 400 - - margin.bottom;

// append the svg object to the body of the page
var svg ="#my_dataviz")
    .attr("width", width + margin.left + margin.right)
    .attr("height", height + + margin.bottom)
          "translate(" + margin.left + "," + + ")");

// Parse the Data
d3.csv("", function(data) {

  // List of groups = header of the csv files
  var keys = data.columns.slice(1)

  // Add X axis
  var x = d3.scaleLinear()
    .domain(d3.extent(data, function(d) { return d.year; }))
    .range([ 0, width ]);
    .attr("transform", "translate(0," + height + ")")

  // Add Y axis
  var y = d3.scaleLinear()
    .domain([0, 200000])
    .range([ height, 0 ]);

  // color palette
  var color = d3.scaleOrdinal()

  //stack the data?
  var stackedData = d3.stack()
    //console.log("This is the stack result: ", stackedData)

  // Show the areas
      .style("fill", function(d) { console.log(d.key) ; return color(d.key); })
      .attr("d", d3.area()
        .x(function(d, i) { return x(; })
        .y0(function(d) { return y(d[0]); })
        .y1(function(d) { return y(d[1]); })



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