D3 Examples - DataVis Module 2: Tree Census by Decile

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<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="utf-8">
        <title>Tree Species Distribution per Hectare, by Decile, for Four American Cities</title>
        <script type="text/javascript" src="https://d3js.org/d3.v3.js"></script>
        <style type="text/css">
            
            body {
                background-color: #ddddff;
            }
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            svg {
                background-color: white;
            }
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        </style>
    </head>
    <body>
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        <script type="text/javascript">     
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​
            var svg = d3.select("body")
                        .append("svg")
                        .attr("width", 900)
                        .attr("height", 180);
​
​
​
            d3.csv("DataVis_TreeCensus_PHILADELPHIA.csv", function(data) {
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                data.sort(function(a, b) {
                    return d3.ascending(+a.TREESperhectare, +b.TREESperhectare);
​
                    //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!).
                });
​
                var rect = svg.selectAll("rect")
                                .data(data)
                                .enter()
                                .append("rect");
​
                rect.attr("x", 0)
                    .attr("y", function(d, i) {
                        return i * 18;
                    })
                    .attr("width", function(d) {
                        return d.TREESperhectare * 8;
                    })
                    .attr("height", 16)
                    .append("title")
                    .text(function(d) {
                        return "For Philadelphia, the " + d.DECILE + " decile represents " + d.TREESperhectare + " trees per hectare or " +  d.TREES_PERCENT;
                    });
​
            });
            
            
            var svg2 = d3.select("body")
                        .append("svg")
                        .attr("width", 900)
                        .attr("height", 180);
​
​
​
            d3.csv("DataVis_TreeCensus_CHICAGO.csv", function(data) {
​
                data.sort(function(a, b) {
                    return d3.ascending(+a.TREESperhectare, +b.TREESperhectare);
​
                    //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!).
                });
​
                var rect2 = svg2.selectAll("rect")
                                .data(data)
                                .enter()
                                .append("rect");
​
                rect2.attr("x", 0)
                    .attr("y", function(d, i) {
                        return i * 18;
                    })
                    .attr("width", function(d) {
                        return d.TREESperhectare * 8;
                    })
                    .attr("height", 16)
                    .append("title")
                    .text(function(d) {
                        return "For Chicago, the " + d.DECILE + " decile represents " + d.TREESperhectare + " trees per hectare or " +  d.TREES_PERCENT;
                    });
​
            });
            
             var svg3 = d3.select("body")
                        .append("svg")
                        .attr("width", 900)
                        .attr("height", 180);
​
​
​
            d3.csv("DataVis_TreeCensus_KANSASCITY.csv", function(data) {
​
                data.sort(function(a, b) {
                    return d3.ascending(+a.TREESperhectare, +b.TREESperhectare);
​
                    //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!).
                });
​
                var rect3 = svg3.selectAll("rect")
                                .data(data)
                                .enter()
                                .append("rect");
​
                rect3.attr("x", 0)
                    .attr("y", function(d, i) {
                        return i * 18;
                    })
                    .attr("width", function(d) {
                        return d.TREESperhectare * 8;
                    })
                    .attr("height", 16)
                    .append("title")
                    .text(function(d) {
                        return "For Kansas City, the " + d.DECILE + " decile represents " + d.TREESperhectare + " trees per hectare or " +  d.TREES_PERCENT;
                    });
​
            });
            
             var svg4 = d3.select("body")
                        .append("svg")
                        .attr("width", 900)
                        .attr("height", 180);
​
​
​
            d3.csv("DataVis_TreeCensus_MINNEAPOLIS.csv", function(data) {
​
                data.sort(function(a, b) {
                    return d3.ascending(+a.TREESperhectare, +b.TREESperhectare);
​
                    //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!).
                });
​
                var rect4 = svg4.selectAll("rect")
                                .data(data)
                                .enter()
                                .append("rect");
​
                rect4.attr("x", 0)
                    .attr("y", function(d, i) {
                        return i * 18;
                    })
                    .attr("width", function(d) {
                        return d.TREESperhectare * 8;
                    })
                    .attr("height", 16)
                    .append("title")
                    .text(function(d) {
                        return "For Minneapolis, the " + d.DECILE + " decile represents " + d.TREESperhectare + " trees per hectare or " +  d.TREES_PERCENT;
                    });
​
            });
        </script>
    </body>
</html>
    