Scatter Plot with Ordinal Axis

Part of the video course: D3.js in Motion.

An example of a scatter plot with an ordinal X axis.

The data shown here comes from Internet Top 20 Countries - Internet Users 2017 - Internet World Stats.

<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width">
    <script src="https://d3js.org/d3.v4.min.js"></script>
    <title>Top Internet Countries Visualization</title>
    <style>
      body {
        margin: 0px;
      }
      .domain {
        display: none;
      }
      .tick line {
        stroke: #C0C0BB;
      }
      .tick text {
        fill: #8E8883;
        font-size: 20pt;
        font-family: sans-serif;
      }
      .axis-label {
        fill: #635F5D;
        font-size: 40pt;
        font-family: sans-serif;
      }
    </style>
  </head>
  <body>
    <svg width="960" height="500"></svg>
    <script>

const xValue = d => d.country;
      const xLabel = 'Country';
      const yValue = d => d.netUsers;
      const yLabel = 'Internet Users';
      const margin = { left: 150, right: 70, top: 20, bottom: 110 };

const svg = d3.select('svg');
      const width = svg.attr('width');
      const height = svg.attr('height');
      const innerWidth = width - margin.left - margin.right;
      const innerHeight = height - margin.top - margin.bottom;

xAxisG.append('text')
          .attr('class', 'axis-label')
          .attr('x', innerWidth / 2)
          .attr('y', 90)
          .text(xLabel);

yAxisG.append('text')
          .attr('class', 'axis-label')
          .attr('x', -innerHeight / 2)
          .attr('y', -100)
          .attr('transform', `rotate(-90)`)
          .style('text-anchor', 'middle')
          .text(yLabel);

const xScale = d3.scalePoint();
      const yScale = d3.scaleLinear();

const xAxis = d3.axisBottom()
        .scale(xScale)
        .tickPadding(15)
        .tickSize(-innerHeight);

const yTicks = 5;
      const yAxis = d3.axisLeft()
        .scale(yScale)
        .ticks(yTicks)
        .tickPadding(15)
        .tickFormat(d3.format('.0s'))
        .tickSize(-innerWidth);

const row = d => {
        const netUsersWithCommas = d['Internet Users 31 Mar 2017'];
        return {
          country: d['Country or Region'],
          netUsers: +netUsersWithCommas.replace(/,/g, '')
        };
      };

const top5 = data => data.slice(0, 5);

d3.csv('data.csv', row, data => {
        data = top5(data);
        xScale
          .domain(data.map(xValue))
          .range([0, innerWidth]);

yScale
          .domain(d3.extent(data, yValue))
          .range([innerHeight, 0])
          .nice(yTicks);

g.selectAll('circle').data(data)
          .enter().append('circle')
            .attr('cx', d => xScale(xValue(d)))
            .attr('cy', d => yScale(yValue(d)))
            .attr('fill', 'black')
            .attr('fill-opacity', 0.6)
            .attr('r', 8);

xAxisG.call(xAxis);
        yAxisG.call(yAxis);
      });
    </script>
  </body>
</html>

https://d3js.org/d3.v4.min.js