D3 Examples - Global Innovation Index Rankings 2017

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<!DOCTYPE html>
<meta charset="utf-8">
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<head>
    <title>GII Ranks</title>
<link href='https://fonts.googleapis.com/css?family=Abel' rel='stylesheet' type='text/css'>
<link href="style.css" rel="stylesheet" type="text/css">
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</head>
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<body>
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<!-- load the d3.js library -->    
<script src="https://d3js.org/d3.v4.min.js"></script>
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<script>
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// Set the dimensions of the canvas / graph
var margin = {top: 40, right: 20, bottom: 70, left: 50},
    width = 1000 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom;
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var div = d3.select("body").append("div")
            .attr("class", "tooltip")
            .style("opacity", 0);
// Parse the date / time
var parseDate = d3.timeParse("%Y");
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// Set the ranges
var x = d3.scaleTime().range([0, width]);  
var y = d3.scaleLinear().range([0, height]);
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// Define the line
var ranks = d3.line() 
    .x(function(d) { return x(d.year); })
    .y(function(d) { return y(d.ranks); });
    
// Adds the svg canvas
var svg = d3.select("body")
    .append("svg")
        .attr("width", width + margin.left + margin.right)
        .attr("height", height + margin.top + margin.bottom)
    .append("g")
        .attr("transform", 
              "translate(" + margin.left + "," + margin.top + ")");
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// Get the data
d3.csv("ts_long.csv", function(error, data) {
    data.forEach(function(d) {
    d.year = parseDate(d.year);
    d.ranks = +d.ranks;
    });
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    // Scale the range of the data
    x.domain(d3.extent(data, function(d) { return d.year; }));
    y.domain([0, d3.max(data, function(d) { return d.ranks; })]);
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    // Nest the entries by symbol
    var dataNest = d3.nest()
        .key(function(d) {return d.country;})
        .entries(data);
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    // set the colour scale
    var color = d3.scaleOrdinal(d3.schemeCategory10);
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    legendSpace = width/dataNest.length; // spacing for the legend
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    // Loop through each symbol / key
    dataNest.forEach(function(d,i) { 
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        svg.append("path")
            .attr("class", "line")
            .style("stroke", function() { // Add the colours dynamically
                return d.color = color(d.key); })
            .attr("d", ranks(d.values))
            .on("mouseover", function (d) {
                    div.transition()
                        .duration(200)
                        .style("opacity", .7);
                    div.html( "Country: " + d.country + "</br>" + "Rank: " + d.ranks)
                        .style("left", (d3.event.pageX) + "px")
                        .style("top", (d3.event.pageY - 28) + "px");
                });
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        // Add the Legend
        svg.append("text")
            .attr("x", (legendSpace/2)+i*legendSpace)  // space legend
            .attr("y", height + (margin.bottom/2)+ 5)
            .attr("class", "legend")    // style the legend
            .style("fill", function() { // Add the colours dynamically
                return d.color = color(d.key); })
            .text(d.key); 
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    });
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  // Add the X Axis
  svg.append("g")
      .attr("class", "axis")
      .attr("transform", "translate(0," + height + ")")
      .call(d3.axisBottom(x));
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  // Add the Y Axis
  svg.append("g")
      .attr("class", "axis")
      .call(d3.axisLeft(y));
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      // titling
     svg.append("text")
         .attr("class", "title")
         .attr("x", 0)
         .attr("y", -10)
         .style("fill","#333")
         .text("Global Innovation Index");
     
     svg.append("text")
         .attr("class", "text")
         .attr("x",500)
         .attr("y",-10)
         .style("fill","#444")
               .attr("text-anchor","start")
         .text("by Zoe Meers.");
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     svg.append("text")
         .attr("class", "text")
         .attr("x",-50)
         .attr("y",50)
         .text("Rank");
    
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});
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</script>
</body>
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