D3 Examples - Life expectancy at birth

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<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="utf-8">
        <title>Module 4 Exercise -- Life Expectancy for all the countries.</title>
        <script type="text/javascript" src="https://d3js.org/d3.v3.js"></script>
        <style type="text/css">
            
            body {
                background-color: white;
                font-family: Roboto, Helvetica, Arial, sans-serif;
            }
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            h1 {
                font-size: 24px;
                margin: 0;
            }
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            p {
                font-size: 14px;
                margin: 5px 0 0 0;
            }
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            svg {
                background-color: white;
            }
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            rect:hover {
                fill: green;
            }
            
            .axis path,
            .axis line {
                fill: none;
                stroke: black;
                shape-rendering: crispEdges;
            }
            
            .axis text {
                font-family: Roboto;
                font-size: 11px;
            }
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            .y.axis path,
            .y.axis line {
                opacity: 0;
            }
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        </style>
    </head>
    <body>
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        <h1>Life expectancy at birth in years</h1>
        <p>Life expectancy at birth indicates the number of years a newborn infant would live if prevailing patterns of mortality at the time of its birth were to stay the same throughout its life.</p>
        <p>Source: <a href="https://data.worldbank.org/indicator/SP.DYN.LE00.IN/countries/">World Bank</a>, 2014</p>
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        <script type="text/javascript">     
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            var w = 700;
            var h = 600;
            var padding = [ 20, 10, 30, 160 ];  //Top, right, bottom, left
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            var widthScale = d3.scale.linear()
                                .range([ 0, w - padding[1] - padding[3] ]);
            
            var heightScale = d3.scale.ordinal()
                                .rangeRoundBands([ padding[0], h - padding[2] ], 0.2);
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            var xAxis = d3.svg.axis()
                            .scale(widthScale)
                            .orient("bottom");
​
            var yAxis = d3.svg.axis()
                            .scale(heightScale)
                            .orient("left");
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            var svg = d3.select("body")
                        .append("svg")
                        .attr("width", w)
                        .attr("height", h);
​
            function randomIntForPickingData(min, max) {
                return Math.floor(Math.random() * (max - min + 1) + min);
            }
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            var normalFillColor = "#BCF5A9";
            var clickFillColor = "#FF6600";
            var changeColorOnClick = (function(){
                var currentColor = normalFillColor;
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                return function(){
                    console.log(currentColor);
                    currentColor = currentColor == normalFillColor ? clickFillColor : normalFillColor;
                    console.log(currentColor);
                    d3.select(this).style("fill", currentColor);
                }
            })();
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            d3.csv("LifeExpectancyAtBirth.csv", function(data) {
                /*data.forEach(function(d) {
                    console.log(d.CountryName);
                });*/
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                console.time("data-transformation");
                data.sort(function(a, b) {
                    return d3.descending(+a["2012"], +b["2012"]);
                });
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                var dataSubset = [];
                var j = 0;
                //As our data is huge [~200 rows], we will only use a subset of the data and for even distribution, we will select one row every n-random-rows to get 30 to 40 rows for the chart; beyond these number of rows, display gets rather too absurd.
                var randomInt = randomIntForPickingData(5, 8);
                for(i = 0; i < data.length; i += randomInt) {
                    dataSubset[j] = data[i];
                    j++;
                }
                data = dataSubset;
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                widthScale.domain([ 0, d3.max(data, function(d) {
                    return +d["2012"];
                }) ]);
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                heightScale.domain(data.map(function(d) { 
                    return d.CountryName; 
                } ));
                console.timeEnd("data-transformation");
​
                console.time("barchart");
                var rects = svg.selectAll("barchart")
                                .data(data)
                                .enter()
                                .append("rect");
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                rects.attr("x", padding[3])
                    .attr("y", function(d) {
                        return heightScale(d.CountryName);
                    })
                    .attr("width", function(d) {
                        return widthScale(d["2012"]);
                    })
                    .attr("height", heightScale.rangeBand())
                    .attr("fill", normalFillColor)
                    //.on("click", changeColorOnClick)
                    .append("title")
                    .text(function(d) {
                        return d.CountryName + "'s life expectancy at birth is " + d["2012"] + " years.";
                    });
                console.timeEnd("barchart");
​
                //To display data values on the bar itself; but at the extreme right end of the bar.
                console.time("data-values");
                svg.selectAll("data-values")
                   .data(data)
                   .enter()
                   .append("text")
                   .text(function(d, i) {
                        return d["2012"];
                   })
                   .attr("text-anchor", "middle")
                   .attr("x", function(d, i) {
                        return widthScale(d["2012"]) + 4.85 * padding[2];
                   })
                   .attr("y", function(d, i) {
                        return heightScale(d.CountryName) + 10;
                   })
                   .attr("fill", "black")
                   .attr("font-size", "10px")
                   .attr("font-family", "roboto");
                console.timeEnd("data-values");
​
                console.time("axes");
                svg.append("g")
                    .attr("class", "x axis")
                    .attr("transform", "translate(" + padding[3] + "," + (h - padding[2]) + ")")
                    .call(xAxis);
​
                svg.append("g")
                    .attr("class", "y axis")
                    .attr("transform", "translate(" + padding[3] + ",0)")
                    .call(yAxis);
                console.timeEnd("axes");
            });
​
        </script>
    </body>
</html>
    