Horizontal lollipop chart in d3.js





This post describes how to build a horizontal lollipop chart with d3.js. It follows the previous post about the most basic lollipop chart. The advantage to make it horizontal is that labels get easier to read, as exlained in data to viz.com.


Lollipop section

Steps:
<!DOCTYPE html>
<meta charset="utf-8">

<!-- Load d3.js -->
<script src="https://d3js.org/d3.v4.js"></script>

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

<script>

// set the dimensions and margins of the graph
var margin = {top: 10, right: 30, bottom: 40, left: 100},
    width = 460 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom;

// append the svg object to the body of the page
var svg = d3.select("#my_dataviz")
  .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 + ")");

// Parse the Data
d3.csv("https://raw.githubusercontent.com/holtzy/data_to_viz/master/Example_dataset/7_OneCatOneNum_header.csv", function(data) {

  // Add X axis
  var x = d3.scaleLinear()
    .domain([0, 13000])
    .range([ 0, width]);
  svg.append("g")
    .attr("transform", "translate(0," + height + ")")
    .call(d3.axisBottom(x))
    .selectAll("text")
      .attr("transform", "translate(-10,0)rotate(-45)")
      .style("text-anchor", "end");

// Y axis
var y = d3.scaleBand()
  .range([ 0, height ])
  .domain(data.map(function(d) { return d.Country; }))
  .padding(1);
svg.append("g")
  .call(d3.axisLeft(y))


// Lines
svg.selectAll("myline")
  .data(data)
  .enter()
  .append("line")
    .attr("x1", function(d) { return x(d.Value); })
    .attr("x2", x(0))
    .attr("y1", function(d) { return y(d.Country); })
    .attr("y2", function(d) { return y(d.Country); })
    .attr("stroke", "grey")

// Circles
svg.selectAll("mycircle")
  .data(data)
  .enter()
  .append("circle")
    .attr("cx", function(d) { return x(d.Value); })
    .attr("cy", function(d) { return y(d.Country); })
    .attr("r", "4")
    .style("fill", "#69b3a2")
    .attr("stroke", "black")
})

</script>

Related blocks →

  • The most basic barplot with d3.js - link

  • Lollipop chart - link