block by jmuyskens 41692f215c3a43e330dd5fcdc92b597b

Multiple time series chart with real data

Full Screen

Demonstration of transforming CSV data using D3

For NICAR Beginning D3, 2017

Charts forked from d3indepth‘s block: DOM Manipulation

forked from darlacameron‘s block: 2. Transforming data

forked from darlacameron‘s block: 3. Drawing shapes

forked from anonymous‘s block: Time series chart with real data

script.js

var parseTime = d3.timeParse('%a %b %d %H:%M:%S +0000 %Y');
var formatTime = d3.timeFormat('%Y-%m-%d');
var parseFormattedTime = d3.timeParse('%Y-%m-%d');

var lineChart = function(data){
  // set the dimensions and margins of the graph
  var margin = {top: 20, right: 20, bottom: 60, left: 50},
      width = 500 - margin.left - margin.right,
      height = 500 - margin.top - margin.bottom;
  
  var nestedData = d3.nest()
  	.key(function(d) { return d.source; })
    .key(function(d) { return formatTime(parseTime(d.created_at)); })
    .sortKeys(d3.ascending)
    .rollup(function(values) { return values.length; })
    .entries(data);
  
  console.log(nestedData);

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

  // define the line
  var line = d3.line()
   .x(function(d) { return x(parseFormattedTime(d.key)); })
   .y(function(d) { return y(d.value); });

  //add a new svg to hold the chart
  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 + ")");

  // Scale the range of the data
  x.domain(d3.extent(data, function(d) { return parseTime(d.created_at); }));
  y.domain([0, 13]);
  
  // Add the line path
  svg.selectAll("path")
    .data(nestedData)
  	.enter().append('path')
    .attr("class", "line")
    .attr("d", function(d) { return line(d.values); });

  // 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));
};

index.html

<!DOCTYPE html>
<meta charset="utf-8">
<head>
	<title>Transforming data</title>
</head>

<style>
	body {
		font-family: "Helvetica Neue", Helvetica, sans-serif;
		font-size: 14px;
	}
	path {
    fill: none;
    stroke: #aaa;
  }
  .line {
    stroke-width:2px;
  }
  .line.lion{
    stroke:red;
  }
  .line.dog{
    stroke:gold;
  }
  .line.tiger{
    stroke:orange;
  }

</style>

<body>
  <svg width="800" height="100">
		<path/>
	</svg>
  
	<script src="//d3js.org/d3.v4.min.js"></script>
  
	<script src="script.js"></script>
  
  <script>
    d3.csv("realdonaldtrump2017.csv", function(error, data) {
      if (error) throw error;
      lineChart(data);
    });
  </script>
</body>
</html>

data.csv

page,lion,dog,tiger
1,1,0,0
2,2,2,0
3,3,3,0
4,3,4,0
5,3,4,0
6,3,4,0
7,3,4,5
8,3,4,5
9,3,4,5
10,3,4,7
11,7,7,7
12,7,7,7
13,8,8,9
14,8,8,9
15,9,9,9
16,10,10,10
17,10,10,10