Module 3, Exercice 3, version 2

<!DOCTYPE html>
<html lang="en">
	<head>
		<meta charset="utf-8">
		<title>Forest area in 2012 in km2</title>
		<script type="text/javascript" src="https://d3js.org/d3.v3.js"></script>
		<style type="text/css">
			
			body {
				background-color: white;
			}

svg {
				background-color: white;
			}
			rect {
				fill: green;
			}

</style>
	</head>
	<body>
		<h1> Top 20 countries by woodland </h1>
		<p>Forest area per country &#40km2, 2012&#41</p>

<script type="text/javascript">

// make svg element to hold the chart
			var svg = d3.select("body")
						.append("svg")
						.attr("width", 1200)
						.attr("height", 600);

// load CSV data
			d3.csv("forestdata.csv", function(data) {

// sort bars in descending order
				data.sort(function(a, b) {
					return d3.descending(+a.forest2012Km2, +b.forest2012Km2);

//If your numeric values aren't sorting properly,
					//try commenting out the line above, and instead using:
					//
					//return d3.descending(+a.lifeSatisfaction, +b.lifeSatisfaction);
					//
					//Data coming in from the CSV is saved as strings (text),
					//so the + signs here force JavaScript to treat those
					//strings instead as numeric values, thereby fixing the
					//sort order (hopefully!).
				});

// create rectangles for each data value
				var rects = svg.selectAll("rect")
								.data(data)
								.enter()
								.append("rect");

// set size for the bars. start each bar at Opx acriss to leave room for labels, and move down 12px for the next  bar.
				rects.attr("x", 110)
					.attr("y", function(d, i) {
						return i * 30;
					})

// divide the data value by 10,000 to fit the scale
					.attr("width", function(d) {
						return d.forest2012Km2 / 10000;
					})

// allot 10px for each bar and compose tooltip
					.attr("height", 30)
					.append("title")
					.text(function(d) {
						return d.country + "'s forest area is " + d.forest2012Km2 + " km2" ;
					})

// add axis labels on left, 15px apart, starting at 9px down and 140px across
					svg.selectAll("text")
					.data(data)
					.enter()
					.append("text")
					.text(function(d){
						return d.country;
					})

.attr("x", 0)
					.attr("y", function(d, i){
						return i * 30 + 18;
					})

// type attributes for the labels					
					.attr({
						"fill": "black",
						"font-family": "sans-serif",
						"font-size": "13px",
						"text-anchor": "start"
					})

});

</script>

<p>Source : Banque mondiale<p>

</body>
</html>

Modified http://d3js.org/d3.v3.js to a secure url

https://d3js.org/d3.v3.js