D3 Examples - Fade in scatterplot

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<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="utf-8">
        <title>Facebook Data Requests by Country</title>
        <script type="text/javascript" src="https://d3js.org/d3.v3.js"></script>
        <style type="text/css">
            
            h1 {
                font-family: sans-serif;
                font-size: 1.5em;
                margin-bottom:0;
            }
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            p {
                font-family: sans-serif;
                font-size: .75em;
                color:gray;
                margin-bottom:0;
            }
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            svg {
                background-color: white;
            }
​
            circle:hover {
                fill: #00664C;
                opacity: 1;
            }
​
            .axis path,
            .axis line {
                fill: none;
                stroke: black;
                shape-rendering: crispEdges;
            }
            
            .axis text {
                font-family: sans-serif;
                font-size: 11px;
            }
​
​
        </style>
    </head>
    <body>
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        <h1>Facebook User Data</h1>
        <p>Number of requests for data by government officials vs. the percentage of those requests filled (July 2014 – Dec. 2014)  |  Source: <a href="https://govtrequests.facebook.com/">Facebook</a></p>
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        <script type="text/javascript">     
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            var w = 750; //sets the width variable 
            var h = 400; //sets the height variable
            var padding = [25, 10, 40, 40];  //top, right, bottom, left 
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​
            var xScale = d3.scale.linear()
                        //.domain([0,15000]) input values
                        .range([padding[3], w - padding[1]]); //pixel values    
​
​
            var yScale = d3.scale.linear()
                        //.domain([0,15000]) input values
                        .range([padding[0], h - padding[2]]); //pixel values    
​
​
​
            var xAxis = d3.svg.axis()
                            .scale(xScale)
                            .orient("bottom")
                            .ticks(14); 
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            var yAxis = d3.svg.axis()
                            .scale(yScale)
                            .orient("left")
                            .tickFormat(function(d){
                                return d + "%";
                            });                                             
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            var svg = d3.select("body")
                        .append("svg")
                        .attr("width", w)
                        .attr("height", h);         
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            d3.csv("FBGovernmentRequests.csv", function(data) {
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                data.sort(function(a, b) {
                    return d3.descending(+a.dataRequests, +b.dataRequests);
                });
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                xScale.domain([0, d3.max(data, function(d){
                    return +d.dataRequests;
                }) ]);
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                yScale.domain([
                    d3.max(data, function(d){
                        return +d.dataProduced;
                    }),
                    0
                ]);
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                var circles = svg.selectAll("circle")
                    .data(data)
                    .enter()
                    .append("circle");
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                circles.attr("cx", function(d){
                    return xScale(d.dataRequests);
                })
                    .attr("cy", function(d){
                        return yScale(d.dataProduced);
                    })
                    .attr("r", 0.1)
                    .attr("opacity", .4)
                    .attr("fill", "#00CC99")
                    .append("title")
                    .text(function(d) {
                        return d.Country + " requested data from " + d.dataRequests + " users and received " + d.dataProduced + " percent of those requests.";
                    }); 
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                    circles.sort(function(a, b){
                        return d3.ascending(+a.dataRequests, +b.dataProduced);
                    })
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                    .transition() //values after transition
                    .delay(function(d, i){
                        return i * 20;
                    })
                    .duration(1000)
                    .attr("r", 4.5);
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                    svg.append("g")
                    .attr("class", "x axis")
                    .attr("transform", "translate(0," + (h - padding[2]) + ")")
                    .call(xAxis);
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                    svg.append("g")
                    .attr("class", "y axis")
                    .attr("transform", "translate(" + (padding[3]) + ",0)")
                    .call(yAxis);
​
​
​
            });
​
​
​
​
    
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        </script>
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​
​
    </body>
</html>
    