Basic lollipop chart in d3.js

Steps:

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 shows the amount of sold weapon per country. See data-to-viz if interested.

First step consists to make a numeric (Y axis) and a categoric scale (X axis). Read here to understand how scales and axis work.

Lollipop is then constituted of a line and a circle.

<!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: 90, left: 40},
    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) {

// X axis
var x = d3.scaleBand()
  .range([ 0, width ])
  .domain(data.map(function(d) { return d.Country; }))
  .padding(1);
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");

// Add Y axis
var y = d3.scaleLinear()
  .domain([0, 13000])
  .range([ height, 0]);
svg.append("g")
  .call(d3.axisLeft(y));

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

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

</script>

Most basic lollipop chart in d3.js

Steps:

Related blocks →