D3 Examples - Unemployment rate with axes

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<!DOCTYPE html>
<html lang="en">
    <head>
        <meta http-equiv="content=type" content="text/html"; charset="utf-8">
        <title>Unemployment rate in Europe</title>
        <script type="text/javascript" src="https://d3js.org/d3.v3.js" charset="utf-8"></script>
        <style type="text/css">
​
            body {
                background-color: white;
                font-family: Helvetica, Arial, sans-serif;
            }
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            h1 {
                font-size: 24px;
                color: #65c8d0;
                margin: 0;
            }
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            p {
                font-size: 14px;
                margin: 10px 0 0 0;
            }
​
            svg {
                background-color: white;
            }
​
            rect:hover {
                fill: #ba9bc9;
            }
            
            .axis path,
            .axis line {
                fill: none;
                stroke: #666666;
                shape-rendering: crispEdges;
            }
            
            .axis text {
                font-family: Helvetica, Arial, sans-serif;
                font-size: 12px;
            }
​
            .y.axis path,
            .y.axis line {
                opacity: 0;
            }
​
        </style>
    </head>
    <body>
        <h1>Unemployment rate in Europe</h1>
        <p>In percentage per country, December 2014. Data from <a href="https://ec.europa.eu/eurostat/web/products-datasets/-/ei_lmhr_m">Eurostat (EU)</a>.</p>
​
        <script type="text/javascript"> 
​
            // Define height and width of SVG box
            var w = 600;
            var h = 700;
            var padding = [ 10, 20, 40, 100 ];  // Paading 0 top, 1 right, 2 bottom, 3 left
​
            // Create scale pixel range for width
            var widthScale = d3.scale.linear()
                                .range([ 0, w - padding[1] - padding[3] ]);
​
            // Create scale pixel range for height, and percentage gap
            var heightScale = d3.scale.ordinal()
                                .rangeRoundBands([ padding[0], h - padding[2] ], 0.2);
​
            // Create x axis at the bottom
            var xAxis = d3.svg.axis()
                            .scale(widthScale)
                            .orient("bottom");
​
            // Create y axis to the left
            var yAxis = d3.svg.axis()
                            .scale(heightScale)
                            .orient("left");
​
            // Create SVG with right height and width
            var svg = d3.select("body")
                        .append("svg")
                        .attr("width", w)
                        .attr("height", h);
​
            // Import data from file
            d3.csv("unemployment.csv", function(data) {
​
                // Sort data
                data.sort(function(a, b) {
                    return d3.descending(+a.n2014M12, +b.n2014M12);
                }); 
​
                // Set domain (input range) for width scale 
                widthScale.domain([ 0, d3.max(data, function(d) {
                    return +d.n2014M12;
                }) ]);
​
                // Set domain (input range) for height scale based on number of countries
                heightScale.domain(data.map(function(d) { return d.country; } ));
​
                // create rectangles
                var rects = svg.selectAll("rect")
                    .data(data)
                    .enter()
                    .append("rect")
​
                // Set attributes for rectangles
                rects.attr("x", padding[3])
                    .attr("y", function(d) {
                        return heightScale(d.country);
                    })
                    .attr("width", function(d) {
                        return widthScale(d.n2014M12);
                    })
                    .attr("height", heightScale.rangeBand())
                    .attr("fill", "#65c8d0")
                    .append("title")
                    .text(function(d) {
                        return d.country + "'s unemployment rate was " + d.n2014M12 + " %" ;
                    });
​
                // Append x axis as group, translate
                svg.append("g")
                    .attr("class", "x axis")
                    .attr("transform", "translate(" + padding[3] + "," + (h - padding[2]) + ")")
                    .call(xAxis);
​
                // Append y axis as group, translate
                svg.append("g")
                    .attr("class", "y axis")
                    .attr("transform", "translate(" + padding[3] + ",0)")
                    .call(yAxis);
            });
        </script>
    </body>
</html>
    