D3 Examples - 6.8 small multiple

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<!DOCTYPE html>
<meta charset="utf-8">
<html>
<head>
​
<!-- Google fonts reference-->
<link href="https://fonts.googleapis.com/css2?family=Montserrat+Alternates:ital,wght@0,100;0,200;0,300;0,400;0,500;0,600;0,700;0,800;0,900;1,100;1,200;1,300;1,400;1,500;1,600;1,700;1,800;1,900&family=Montserrat:ital,wght@0,100;0,200;0,300;0,400;0,500;0,600;0,700;0,800;0,900;1,100;1,200;1,300;1,400;1,500;1,600;1,700;1,800;1,900&family=Roboto:ital,wght@0,100;0,300;1,100;1,300&display=swap" rel="stylesheet">
​
<!-- Connecting with D3 library-->
<script src="https://d3js.org/d3.v4.min.js"></script>
​
<!-- Creating the headlines -->
<p id="h1">AREA CHART | MULTIPLE</p>
<div id="link"> by
<a href="https://slides.com/sandravizmad">SANDRA</a> | <a href="https://data.oecd.org/forest/forest-resources.htm">DATA </a></div>
​
<style>
​
/*Defining text stylings*/
​
#h1 {
  font-size:30px;
  margin:30px 0px 0px 20px;
  color:#f5fa91;
  font-family:'Montserrat Alternates', sans-serif;
  font-weight:300;
}
​
#link {
    font-family:'Montserrat Alternates', sans-serif;
  font-weight:200;
  font-size:10px;
    margin:5px 0px 0px 22px;
  color:white;
}
​
a:link, a:visited, a:active {
    text-decoration:none;
  color:white;
  border-bottom:1.5px dotted white;
}
​
body {
  background-color:#011227;
}
​
/*Defining axis stylings*/
​
.y-axis text, .x-axis text {
  font-family:'Montserrat Alternates', sans-serif;
  font-weight:400;
  font-size:7px;
  opacity:1;
  fill:white;
}
​
.y-axis path {
  fill:none;
  stroke-width:0;
  stroke-opacity:1;
  stroke:white;
}
​
.x-axis path {
  fill:none;
  stroke-width:0;
  stroke-opacity:1;
  stroke:white;
}
​
.y-axis line, .x-axis line {
  fill:none;
  stroke-width:0.3;
  stroke-opacity:0.6;
  stroke:white;
  stroke-dasharray:2;
}
​
/*Defining chart stylings*/
​
.line_n {
  stroke-width:1.5px;
  stroke:#8ff798;
  fill:none;
}
​
.area_prop {
  fill:#85f6fa;
  opacity:0.3;
}
​
.area_prop:hover {
  fill:#85f6fa;
  opacity:1;
}
​
.titles {
  font-family:'Montserrat Alternates', sans-serif;
  font-weight:400;
  font-size:12px;
  fill:#f5fa91;
}
​
</style>
</head>
​
<body>
<script>
​
//Margin conventions
var m = {top:50, right:50, bottom:50, left:20}
    w = 0,
    h = 0;
​
//Container
var svg = d3.select("body")
      .append("svg")
    .attr("width", w + m.left + m.right)
    .attr("height", h + m.top + m.bottom)
    .append("g")
        .attr("transform", `translate(${m.left}, ${m.top})`);
​
//Margin conventions for the small multiple container
var m_s = {top:20, right:15, bottom:20, left:25}
    w_s = 150 - m_s.left - m_s.right,
    h_s = 120 - m_s.top - m_s.bottom;
​
//Define the format
var parseDate = d3.timeParse("%Y"),
    formatDate = d3.timeFormat("%y"),
    formatNumber = d3.format(".0s");
​
//Data loading
d3.csv(
  'https://gist.githubusercontent.com/sandravizz/2b445498a7069725b8bf3ddedf37956e/raw/f3abfb6e59db1da6b5ea50ee848aa8ee22910a59/OECD:%2520Tree%2520felling%2520over%2520time%2520by%2520country',
  prepare,
  data => {
​
  //Nesting the data by symbol
    var country = d3.nest()
      .key(d => d.LOCATION)
          .entries(data);
​
    //Small multiple container
    var small = d3.select("svg")
            .data(country)
            .enter()
            .append("svg")
            .attr("width", w_s + m_s.left + m_s.right)
            .attr("height", h_s + m_s.top + m_s.bottom)
            .append("g")
            .attr("transform", `translate(${m_s.left}, ${m_s.top})`);
​
  //X scale
  var x = d3.scaleTime()
      .range([0, w_s])
        .domain(d3.extent(data, d => d.TIME));
​
  //Y scale
  var y = d3.scaleLinear()
      .domain([0, d3.max(data, d => +d.Value)])
      .range([h_s, 0]);
​
  //X Axis
  small.append("g")
      .attr("class", "x-axis")
      .attr("transform", `translate(0, ${h_s})`)
      .call(d3.axisBottom(x)
              .tickPadding(5)
              .tickSize(-h_s)
              .tickValues([parseDate(2010)])
              .tickFormat(formatDate));
​
  //Y axis
  small.append("g")
      .attr("class", "y-axis")
      .call(d3.axisLeft(y)
              .tickValues([100000])
              .tickSize(-w_s)
              .tickPadding(3)
              .tickFormat(formatNumber));
​
  //Area generator
  var area = d3.area()
      .x(d => x(d.TIME))
      .y0(y(0))
      .y1(d => y(d.Value));
​
  //Line generator
  var line = d3.line()
      .x(d => x(d.TIME))
      .y(d => y(d.Value));
​
  //Draw the line
  small.append("path")
      .attr("class", "line_n")
      .attr("d", d => line(d.values))
​
  //Draw the area
  small.append("path")
      .attr("class", "area_prop")
      .attr("d", d => area(d.values))
​
  //Adding the titles
  small.append("text")
      .attr("text-anchor", "start")
      .attr("y", -25)
      .attr("x", -20)
      .attr("class", 'titles')
      .text(d => d.key)
})
​
//Make sure all variables are numbers
function prepare (d) {
  d.Value = +d.Value;
  d.TIME = parseDate(d.TIME);
  return d;
}
​
</script>
</body>
</html>
​
    