Line Graph (d3)

<!DOCTYPE html>
<meta charset="utf-8">
<style>

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

</style>
<body>
	<script src="//d3js.org/d3.v4.min.js"></script>
<script>

// Set graph dimensions and margins
var margin = {top: 50, right: 20, bottom: 110, left: 40},
    width = 960 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom;

// Targets for filtering data
var targetYear = "2004";
var targetAirport = "ATL";

// Time parser
var parseTime = d3.timeParse("%m");

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

// Define line
var line = d3.line()
    .x(function(d) {
      return x(d.Month);
    })
    .y(function(d) {
      return y(d.Delayed);
    });
          
// Appends an svg to the body and a group which is moved 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 data
d3.csv("airlines.csv", function(error, data) {
  if (error) throw error;

// Filters the data to a manageable chunk
  var newData = data.filter(function filterCriteria(d) {
    return (d.Year == targetYear) && (d.Code == targetAirport);
  });

// Formats data
  newData.forEach(function(d) {
    d.Month = parseTime(d.Month);
    d.Delayed = +d.Delayed;

});
	
  // Scale the range of the data in the domains
  x.domain(d3.extent(newData, function(d) {
    return d.Month; 
  }));
  y.domain([0, d3.max(newData, function(d) {
    return d.Delayed; 
  })]);

// Appends the path of the line
  svg.append("path")
    .data([newData])
    .attr("class", "line")
    .attr("d", line);

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

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

// Make a title
  svg.append("text")
      .attr("x", (width / 2))
      .attr("y", 0 - (margin.top / 2))
      .attr("text-anchor", "middle")
      .style("font-size", "20px")
      .text("Number of Delayed Flights for " + (targetAirport) + " in " + targetYear);

});

</script>
</body>

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