Fade in scatterplot

<!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;
			}

p {
				font-family: sans-serif;
				font-size: .75em;
				color:gray;
				margin-bottom:0;
			}

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>

<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>

var w = 750; //sets the width variable 
			var h = 400; //sets the height variable
			var padding = [25, 10, 40, 40];  //top, right, bottom, left

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);

var yAxis = d3.svg.axis()
							.scale(yScale)
							.orient("left")
							.tickFormat(function(d){
								return d + "%";
							});

var svg = d3.select("body")
						.append("svg")
						.attr("width", w)
						.attr("height", h);

d3.csv("FBGovernmentRequests.csv", function(data) {

data.sort(function(a, b) {
					return d3.descending(+a.dataRequests, +b.dataRequests);
				});

xScale.domain([0, d3.max(data, function(d){
					return +d.dataRequests;
				}) ]);

yScale.domain([
					d3.max(data, function(d){
						return +d.dataProduced;
					}),
					0
				]);

var circles = svg.selectAll("circle")
					.data(data)
					.enter()
					.append("circle");

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.";
					});

circles.sort(function(a, b){
						return d3.ascending(+a.dataRequests, +b.dataProduced);
					})

.transition() //values after transition
					.delay(function(d, i){
						return i * 20;
					})
					.duration(1000)
					.attr("r", 4.5);

svg.append("g")
					.attr("class", "x axis")
					.attr("transform", "translate(0," + (h - padding[2]) + ")")
					.call(xAxis);

svg.append("g")
					.attr("class", "y axis")
					.attr("transform", "translate(" + (padding[3]) + ",0)")
					.call(yAxis);

});

</script>

</body>
</html>

Modified http://d3js.org/d3.v3.js to a secure url

https://d3js.org/d3.v3.js