#KnightD3 - Exercise Module 6: Multiple lines

<!DOCTYPE html>
<html lang="en">
	<head>
		<meta charset="utf-8">
		<title>#KnightD3 - Exercise Module 6: Multiple lines</title>
		<script type="text/javascript" src="https://d3js.org/d3.v3.js"></script>
		<style type="text/css">
			
			body {
				background-color: white;
				font-family: Helvetica, Arial, sans-serif;
			}

h1 {
				font-size: 24px;
				margin: 0;
			}

p {
				font-size: 14px;
				margin: 10px 0 0 0;
			}

svg {
				background-color: white;
			}

circle:hover {
				fill: orange;
			}

path {
				stroke: gray;
				stroke-width: 0.5;
			}

g.highlight path {
				stroke: steelblue;
				stroke-width: 3;
			}
			
			.axis path,
			.axis line {
				fill: none;
				stroke: black;
				stroke-width: 1;
				shape-rendering: crispEdges;
			}
			
			.axis text {
				font-family: sans-serif;
				font-size: 11px;
			}

</style>
	</head>
	<body>

<h1>Internet users in Africa vs. rest of the world</h1>

<p>% of individuals using the internet in Sub-saharan Africa countries (for countries where data is available), 2007-2013. Source: World Bank data, downloaded via <a href="https://thewebindex.org/data/?indicator=I2&country=AFR" target="_blank">The Web Index</a>, 2014</p>

//Dimensions and padding
			var w = 700;
			var h = 600;
			var padding = [ 20, 10, 50, 100 ];  //Top, right, bottom, left

//Set up date formatting and years
			var dateFormat = d3.time.format("%Y");

//Set up scales
			var xScale = d3.time.scale()
								.range([ padding[3], w - padding[1] - padding[3] ]);
			
			var yScale = d3.scale.linear()
								.range([ padding[0], h - padding[2] ]);

//Configure axis generators
			var xAxis = d3.svg.axis()
							.scale(xScale)
							.orient("bottom")
							.ticks(7)
							.tickFormat(function(d) {
								return dateFormat(d);
							});

var yAxis = d3.svg.axis()
							.scale(yScale)
							.orient("left");

//Configure line generator
			var line = d3.svg.line()
				.x(function(d) {
					return xScale(dateFormat.parse(d.year));
				})
				.y(function(d) {
					return yScale(+d.amount);
				});

//Create the empty SVG image
			var svg = d3.select("body")
						.append("svg")
						.attr("width", w)
						.attr("height", h);

//Load data
			d3.csv("internetUsers.csv", function(data) {

//New array with all the years, for referencing later
				var years = ["2007", "2008", "2009", "2010", "2011", "2012", "2013",];

//Create a new, empty array to hold our restructured dataset
				var dataset = [];

//Loop once for each row in data
				for (var i = 0; i < data.length; i++) {

//Create new object with this country's name and empty array
					dataset[i] = {
						country: data[i].country,
						users: []
					};

//Loop through all the years
					for (var j = 0; j < years.length; j++) {

// If value is not empty
						if (data[i][years[j]]) {
							//Add a new object to the users data array
							//for this country
							dataset[i].users.push({
								year: years[j],
								amount: data[i][years[j]]
							});
						}

}

//Set scale domains
				xScale.domain([ 
					d3.min(years, function(d) {
						return dateFormat.parse(d);
					}),
					d3.max(years, function(d) {
						return dateFormat.parse(d);
					})
				]);

yScale.domain([ 
					d3.max(dataset, function(d) {
						return d3.max(d.users, function(d) {
							return +d.amount;
						});
					}),
					0
				]);

//Make a group for each country
				var groups = svg.selectAll("g")
					.data(dataset)
					.enter()
					.append("g")
					.classed("highlight", function(d) {

if (d.country == "Benin" ||
							d.country == "Botswana" ||
							d.country == "Burkina Faso" ||
							d.country == "Cameroon" ||
							d.country == "Ethiopia" ||
							d.country == "Ghana" ||
							d.country == "Kenya" ||
							d.country == "Malawi" ||
							d.country == "Mali" ||
							d.country == "Mauritius" ||
							d.country == "Mozambique" ||
							d.country == "Namibia" ||
							d.country == "Nigeria" ||
							d.country == "Rwanda" ||
							d.country == "Senegal" ||
							d.country == "Sierra Leone" ||
							d.country == "South Africa" ||
							d.country == "Uganda" ||
							d.country == "Tanzania" ||
							d.country == "Zambia" ||
							d.country == "Zimbabwe" ) {
							return true;
						} else {
							return false;
						}

});

//Append a title with the country name (so we get easy tooltips)
				groups.append("title")
					.text(function(d) {
						return d.country;
					});

//Within each group, create a new line/path,
				//binding just the users data to each one
				groups.selectAll("path")
					.data(function(d) {
						return [ d.users ];
					})
					.enter()
					.append("path")
					.attr("class", "line")
					.attr("d", line)
					.attr("fill", "none")
					.attr("stroke-width", 2);

//Axes
				svg.append("g")
					.attr("class", "x axis")
					.attr("transform", "translate(0," + (h - padding[2]) + ")")
					.call(xAxis);

svg.append("g")
					.attr("class", "y axis")
					.attr("transform", "translate(" + (padding[3]) + ",0)")
					.call(yAxis);

});
			//End data load function

</script>

</body>
</html>

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

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