D3 Examples - Small multiple area line charts

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<!DOCTYPE html>
<meta charset="utf-8">
<style>
​
body {
  font: 10px Arial;
  margin: 0;
  
}
​
.line {
  fill: none;
  stroke: #426789;
  stroke-width: 2px;
  }
​
.area {
  fill: #e8eef4;
}
​
g#xAxisG text, g#yAxisG text {
    stroke: none;
    fill: silver;
    font-size: 9px;
}
​
header, div#source {
    margin-left: 40px;
    margin-bottom: 38px;
}
​
</style>
<body>
​
<div id="charts"></div>
​
<script src="https://d3js.org/d3.v4.min.js"></script>
<script>
​
var margin = {top: 8, right: 15, bottom: 20, left: 40},
    width = 180 - margin.left - margin.right,
    height = 120 - margin.top - margin.bottom;
​
var xScale = d3.scaleLinear()
    .range([0, width]);
​
var yScale = d3.scaleLinear()
    .range([height, 0]);
  
var yAxis = d3.axisLeft()
  .scale(yScale)
  .ticks(3);
​
var area = d3.area()
    .x(function(d) { return xScale(d.year); })
    .y0(height)
    .y1(function(d) { return yScale(d.value); });
​
var line = d3.line()
    .x(function(d) { return xScale(d.year); })
    .y(function(d) { return yScale(d.value); });
​
d3.csv("data.csv", convertTextToNumbers, function(error, data) {
  
  xScale.domain(d3.extent(data, function(d) { return d.year; }));
  yScale.domain([0,d3.max(data, function(d) {  return d.value; })]);
  
  // Nest data by subject.
  var cities = d3.nest()
      .key(function(d) { return d.city; })
      .entries(data);
  
  var nz = cities.filter(function(d){ return d.key === "NZ" });
  cities = cities.filter(function(d){ return d.key !== "NZ" });
  
​
  // Add an SVG element for each city
  var svg = d3.select("#charts").selectAll("svg")
      .data(cities)
    .enter().append("svg")
    .style("margin-bottom", "10px")
      .attr("width", width + margin.left + margin.right)
      .attr("height", height + margin.top + margin.bottom)
    .append("g")
      .attr("transform", "translate(" + margin.left + "," + margin.top + ")")
      ;
  
  svg.append("path")
      .attr("class", "line")
      .attr("d", function(d) {return line(nz[0].values); })
        .style("stroke", "lightgrey");
  
​
  // Add the area path elements
  /*svg.append("path")
      .attr("class", "area")
      .attr("d", function(d) { return area(d.values); });*/
​
  // Add the line path elements
  svg.append("path")
      .attr("class", "line")
      .attr("d", function(d) {return line(d.values); });
​
  // Add a labels
  svg.append("text")
      .attr("x", (width + 10)/2)
      .attr("y", height - 85)
      .style("text-anchor", "middle")
      .style("font-size", "12px")
      .attr("fill", "#B35959")
        .text(function(d) { return d.key; });   
       
  svg.append("text")
    .text(xScale.domain()[0])
      .attr("x", 0)
      .attr("y", height + 15)
      .style("text-anchor", "start")
      .style("font-size", "12px")
      .attr("fill", "#B35959");
  
  svg.append("text")
    .text(xScale.domain()[1])
      .attr("x", width)
      .attr("y", height + 15)
      .style("text-anchor", "end")
      .style("font-size", "12px")
      .attr("fill", "#B35959");
      
  //add axes
    svg.append("g").attr("id", "yAxisG").call(yAxis);
    d3.selectAll("path.domain").remove();
    d3.selectAll("line").style("stroke", "silver");
    
});
​
function convertTextToNumbers(d) {
  d.year = +d.year;
  d.value = +d.value;
  return d;
}
​
</script>
    