6.8 small multiple | area

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

<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>

//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>

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