D3 Examples - How many businesses and employees per sector in San Francisco?

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<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="utf-8">
        <title>Distribution of San Francisco Businesses and Employees per Sector</title>
        <script type="text/javascript" src="https://d3js.org/d3.v3.js"></script>
        <style type="text/css">
        
            body {
                background-color: white;
                font-family: Helvetica, Arial, sans-serif;
            }
​
            h1 {
                font-size: 24px;
                margin: 0;
            }
            
            h2 {
                font-size: 18px;
                margin: 0;
            }
            
            h3 {
                font-size: 10px;
                margin: 0;
            }
​
            p {
                font-size: 14px;
                margin: 10px 0 0 0;
            }
​
            svg {
                background-color: white;
            }
​
            circle:hover {
                fill: orange;
            }
        
            .axis path,
            .axis line {
                fill: none;
                stroke: black;
                shape-rendering: crispEdges;
            }
            
            .axis text {
                font-family: sans-serif;
                font-size: 9px;
                fill: black;
            }   
                
        </style>
    </head>
    <body>
        
        <h1>How many businesses and employees per sector in San Francisco? </h1>
​
        <h3>Establishments of employees and business per Sector. Source: <a href="https://quickfacts.census.gov/qfd/states/06/06075.html">US Census</a>, 2014</h3><br>
        
        <p>It sure feels a lot more than that! 1 in 4 workers in San Francisco are employed in a scientific, technical, information or professional services</p>
        
        <script type="text/javascript">
​
            //r and height
            var w = 1200;
            var h = 400;
            var barPadding = 7;
            var padding = [ 25, 15, 25, 40 ];  //Top, right, bottom, left
            
            var xScale = d3.scale.linear()
                                .range([ 0, w - padding[1] - padding[3] ]);
            
            var yScale = d3.scale.linear()
                                .range([ padding[0], h - padding[2] ]);
            
            //Create SVG element
            var svg = d3.select("body")
                        .append("svg")
                        .attr("width", w)
                        .attr("height", h);
                        
            
            d3.csv("SF_Business&IndustryWK5.csv",function(data) { 
            
            //Create scale functions
​
                data.sort(function(a, b) {
                    return d3.descending(+a.Establishments, +b.Establishments);
                });
                    
                xScale.domain([ 0, d3.max(data, function(d) {
                    return +d.Establishments;
                }) ])
//              .range([0, w]);
                      
                
                yScale.domain([d3.max(data, function(d) {
                    return +d.Employees; 
                }), 0]);
                         
​
            //Create Axis
            var xAxis = d3.svg.axis()
                          .scale(xScale)
                          .orient("bottom")
                          .ticks(8);      
                          
            var yAxis = d3.svg.axis()
                          .scale(yScale)
                          .orient("left")
                          .ticks(8);                  
​
​
            var circles = svg.selectAll("circle")
                           .data(data)
                           .enter()
                           .append("circle");
                           
            circles.attr("cx", function(d) {
                    return xScale(d.Establishments)+padding[3];
                })
               .attr("cy", function(d, i) { 
                    return yScale(d.Employees);
                })
               .attr("r", 10)
               .attr("fill", "blue")
               .append("title")
               .text(function(d) {
                    return "The " +d.Sector + " sector has " + Math.round(d.Establishments) + " businesses and employs " + Math.round(d.Employees) + " workers.";
                });
                
            circles.sort(function(a, b) {
                        return d3.ascending(+a.Employees, +b.Employees);
                    })
                    .transition()
                    .delay(function(d, i) {
                        return i * 50;
                    })
                    .duration(2000)
                    .attr("r", 2.5);    
        
​
            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);   
​
            });
            
        </script>
    </body>
</html>
    