D3 Examples - Exercise 2: Free lunch in PBC public schools

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<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="utf-8">
        <title>Exercise 2: Free lunch</title>
        <script type="text/javascript" src="https://d3js.org/d3.v3.min.js"></script>
        <style type="text/css">
            
            body {
                background-color: lightcyan;
            }
​
            svg {
                background-color: white;
            }
            p {
                color: black;
                font-family: Helvetica, sans-serif;
                font-size: 16px;
            }
            h1 {
                color: black;
                font-family: Helvetica, sans-serif;
                font-size: 22px;
            }
            rect:hover{
            fill: dodgerblue;
        }
        </style>
    </head>
    <body>
        <h1>STUDENTS WHO QUALIFY FOR FREE LUNCH</h1>
        <p>The percentage of students qualifying for free lunch in Palm Beach County public schools is higher now than at any time during the past 20 years.</style></p>
​
        <script type="text/javascript">     
​
​
            var svg = d3.select("body")
                        .append("svg")
                        .attr("width", 300)
                        .attr("height", 440)
                        .attr("fill", "blue");
​
​
​
            d3.csv("FRlunchdata.csv", function(data) {
​
                data.sort(function(a, b) {
                    return d3.ascending(a.YEAR, b.YEAR);
                });
​
                var rects = svg.selectAll("rect")
                                .data(data)
                                .enter()
                                .append("rect");
​
                rects.attr("x", 0)
                    .attr("y", function(d, i) {
                        return i * 20;
                    })
                    .attr("width", function(d) {
                        return d.Percentfreelunch * 3;
                    })
                    .attr("height", 19)
                    .append("title")
                    .text(function(d) {
                        return d.Percentfreelunch + "% of students qualified for free lunch in " + d.YEAR;
                    });
​
                svg.selectAll("text")
                    .data(data)
                    .enter()
                    .append("text")
                    .text(function(d) {
                        return d.YEAR;
                    })
                    .attr("x", 5)
                    .attr("y", function(d, i) {
                        return i * 20 + 14;
                    })
                    .attr("font-family", "sans-serif")
                    .attr("font-size", "12px")
                    .attr("fill", "white");
                    });
        </script>
​
    </body>
</html>
    