D3 Examples - Exercise Module 3

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<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="utf-8">
        <title>Horizontal Bar chart</title>
        <script type="text/javascript" src="https://d3js.org/d3.v3.js"></script>
        <style type="text/css">
            
            body {
                background-color: DarkBlue;
            }
​
            svg {
                background-color: rgba(0,0,255,0.3);
            }
​
        </style>
    </head>
    <body>
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        <script type="text/javascript">     
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            var svg = d3.select("body")
                        .append("svg")
                        .attr("width", 800)
                        .attr("height", 600);
​
​
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            d3.csv("nyc-schoolage-65populations.csv", function(data) {
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                data.sort(function(a, b) {
                    return d3.descending(+a.TwentyTwentyPercentPopulation, +b.TwentyTwentyPercentPopulation);
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                    //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!).
                });
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                var rects = svg.selectAll("rect")
                                .data(data)
                                .enter()
                                .append("rect");
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rects.style("fill", "white");
                rects.attr("x", 0)
                    .attr("y", function(d, i) {
                        return i * 50;
                    })
                    .attr("width", function(d) {
                        return d.TwentyTwentyPercentPopulation * 41;
                    })
                    .attr("height", 40)
                    .append("title")
                    .text(function(d) {
                        return d.AgeGroup + " population of new yorkers in " + d.Borough + " on 2020 will be " + d.TwentyTwentyPercentPopulation;
                    });
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            });
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        </script>
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    </body>
</html>
    