D3 Examples - Scatter Plot with Time Axis

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<!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>
  <script src="https://unpkg.com/d3-tip@0.7.1"></script>
    <title>Temperature 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: 30pt;
        font-family: sans-serif;
      }
      
            /* Tooltip styles copied from
            https://bl.ocks.org/Caged/6476579 */
    .d3-tip {
      line-height: 1;
      padding: 12px;
      background: rgba(0, 0, 0, 0.8);
      color: #fff;
      border-radius: 2px;
    }
    </style>
  </head>
  <body>
    <svg width="960" height="500"></svg>
    <script>
      const xValue = d => d.Date;
      const xLabel = 'Time';
      const yValue = d => d.Rides;
      const yLabel = 'Rides';
      const margin = { left: 120, right: 30, top: 20, bottom: 120 };
​
      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', 100)
          .text(xLabel);
​
      yAxisG.append('text')
          .attr('class', 'axis-label')
          .attr('x', -innerHeight / 2)
          .attr('y', -80)
          .attr('transform', `rotate(-90)`)
          .style('text-anchor', 'middle')
          .text(yLabel);
​
      const xScale = d3.scaleTime();
      const yScale = d3.scaleLinear();
​
      const xAxis = d3.axisBottom()
        .scale(xScale)
        .ticks(5)
        .tickPadding(15)
        .tickSize(-innerHeight);
​
      const yAxis = d3.axisLeft()
        .scale(yScale)
        .ticks(5)
        .tickPadding(15)
        .tickSize(-innerWidth);
​
      const row = d => {
        d.Date = new Date(d.Date);
        d.Rides = +d.Rides;
        return d;
      };
      
var tip = d3.tip()
  .attr('class', 'd3-tip')
  .offset([-10, 0])
  .html(function(d) {
    return "<p>Date: " + d3.timeFormat("%A")(d.Date) + "</p><p>Rides: " + d.Rides + "</p>";
  })
​
svg.call(tip);
      
      d3.csv('metro-bike-share-trips-2017-q3_date_small.csv', row, data => {
        xScale
          .domain(d3.extent(data, xValue))
          .range([0, innerWidth])
          .nice();
​
        yScale
          .domain(d3.extent(data, yValue))
          .range([innerHeight, 0])
          .nice();
​
        g.selectAll('circle').data(data)
          .enter().append('circle')
            .attr('cx', d => xScale(xValue(d)))
            .attr('cy', d => yScale(yValue(d)))
            .attr('fill-opacity', 0.6)
            .attr('r', 8)
        .on('mouseover', tip.show)
      .on('mouseout', tip.hide);
​
        xAxisG.call(xAxis);
        yAxisG.call(yAxis);
      });
​
    </script>
  </body>
</html>
​
    