D3 Examples - Doctorate recipients, by major field of study, 2015

Doctorate recipients, by major field of study, 2015
The data describes the recipients number of Doctorate degree in a variety of major field of studies. This data is downloaded from National Science Foundation (NSF) at
xxxxxxxxxx
 
<!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: #838f8d;
        font-size: 10pt;
        font-family: sans-serif;
      }
      .axis-label {
        fill: #635F5D;
        font-size: 20pt;
        font-family: sans-serif;
      }
    </style>
  </head>
  <body>
    <svg width="960" height="500"></svg>
    <script>
      const xValue = d => d.name;
      const xLabel = 'Major';
      const yValue = d => d.value;
      const yLabel = 'PhD recipients';
      const margin = { left: 150, right: 100, 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;
​
      const g = svg.append('g')
          .attr('transform', `translate(${margin.left},${margin.top})`);
      const xAxisG = g.append('g')
          .attr('transform', `translate(0, ${innerHeight})`);
      const yAxisG = g.append('g');
​
      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)
        .tickSize(-innerWidth);
​
      const row = d => {
        const netUsersWithCommas = d['value'];
        return {
          name: d['name'],
          value: +netUsersWithCommas
        };
      };
            
      const top6 = data => data.slice(0, 6)
      
      d3.csv('data.csv', row, data => {
        data = top6(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>
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