Graph and table with tricks in v4

This is a simple graph demonstrating the addition of a table with several 'tricks' and a graph (open in full screen to see the table). This was written using d3.js v4 and is a follow on to the simple graph with table example here.

This graph is part of the code samples for the update to the book D3 Tips and Tricks to version 4 of d3.js.

<!DOCTYPE html>
<meta charset="utf-8">
<style> /* set the CSS */

.line {
  fill: none;
  stroke: steelblue;
  stroke-width: 2px;
}

td, th {
  padding: 1px 4px;
  border: 1px black solid;
}

</style>
<body>

<script src="https://d3js.org/d3.v4.min.js"></script>
<script>

// set the dimensions and margins of the graph
var margin = {top: 20, right: 20, bottom: 30, left: 50},
    width = 960 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom;

// parse the date / time
var parseTime = d3.timeParse("%d-%b-%y");

// set the ranges
var x = d3.scaleTime().range([0, width]);
var y = d3.scaleLinear().range([height, 0]);

// define the line
var valueline = d3.line()
    .x(function(d) { return x(d.date1); })
    .y(function(d) { return y(d.close); });

// append the svg obgect to the body of the page
// appends a 'group' element to 'svg'
// moves the 'group' element to the top left margin
var svg = d3.select("body").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 + ")");

// Get the data
d3.csv("data2.csv", function(error, data) {
  if (error) throw error;

// format the data
  data.forEach(function(d) {
      d.date1 = parseTime(d.date);
      d.close = +d.close;
      d.open = +d.open;  //  <= added this for tidy house keeping
      d.diff = Math.round(( d.close - d.open ) * 100 ) / 100;
  });

// Scale the range of the data
  x.domain(d3.extent(data, function(d) { return d.date1; }));
  y.domain([0, d3.max(data, function(d) { return d.close; })]);

// Add the valueline path.
  svg.append("path")
      .data([data])
      .attr("class", "line")
      .attr("d", valueline);

// Add the X Axis
  svg.append("g")
      .attr("transform", "translate(0," + height + ")")
      .call(d3.axisBottom(x));

// Add the Y Axis
  svg.append("g")
      .call(d3.axisLeft(y));

// The table generation function
function tabulate(data, columns) {
    var table = d3.select("body").append("table")
            .attr("style", "margin-left: 360px")
            .style("border-collapse", "collapse")
            .style("border", "2px black solid"),
        thead = table.append("thead"),
        tbody = table.append("tbody");

// append the header row
    thead.append("tr")
        .selectAll("th")
        .data(columns)
        .enter()
        .append("th")
            .text(function(column) { return column; });

// create a row for each object in the data
    var rows = tbody.selectAll("tr")
        .data(data)
        .enter()
        .append("tr");

// create a cell in each row for each column
    var cells = rows.selectAll("td")
        .data(function(row) {
            return columns.map(function(column) {
                return {column: column, value: row[column]};
            });
        })
        .enter()
        .append("td")
        .attr("style", "font-family: Courier") // sets the font style
            .html(function(d) { return d.value; });
    
    return table;
}

// render the table
var peopleTable = tabulate(data, ["date", "close", "open", "diff"]);

peopleTable.selectAll("tbody tr") 
           .sort(function(a, b) {
             return d3.descending(a.close, b.close);
           });

peopleTable.selectAll("thead th")
           .text(function(column) {
             return column.charAt(0).toUpperCase() + column.substr(1);
           });

});

</script>
</body>

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