Dot plot example

<!DOCTYPE html>
<html lang="en">
	<head>
		<meta charset="utf-8">
		<title>Adding Labels</title>
		<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.6/d3.min.js"></script>
		<style type="text/css">

body {
				background-color: #ddddff;
				font-family: sans-serif;
			}

h3 {
				margin-left: 200px;
			}

p {
				margin-left: 200px;
				font-size: 11pt;
				color: gray;
			}

div.y2015 {
				color: #6699FF;
				display: inline;
			}
			div.y1990 {
				color: orange;
				display: inline;
			}

svg {
				background-color: white;
			}

circle {
				stroke-width: 1;
			}

circle.y2015 {
				fill: #6699FF;
			}

circle.y1990 {
				fill: orange;
			}

circle:hover {
				stroke-width: 3;
				stroke: white;
			}

line.grid {
				stroke: #eee;
			}

line.between {
				stroke: black;
			}

.axis path,
			.axis line {
				fill: none;
				stroke: black;
				shape-rendering: crispEdges;
			}

.axis text {
				font-family: sans-serif;
				font-size: 11px;
			}

.xlabel {
				font-famile: sans-serif;
				font-size: 11px;
				color: gray;
			}

</style>
	</head>
	<body>

<h3>Access to Good Water Sources by World Region, <div class="y1990">1990</div> versus <div class="y2015">2015</div></h3>
		<p>Source: WHO/UNICEF data, 2015.

// this is the size of the svg container -- the white part
			var fullwidth = 1000,
				fullheight = 500;

// these are the margins around the graph. Axes labels go in margins.
			var margin = {top: 20, right: 25, bottom: 20, left: 200};

var width = 1000 - margin.left - margin.right,
    		height = 500 - margin.top - margin.bottom;

var widthScale = d3.scale.linear()
								.range([ 0, width]);

var heightScale = d3.scale.ordinal()
								.rangeRoundBands([ margin.top, height], 0.2);

var xAxis = d3.svg.axis()
							.scale(widthScale)
							.orient("bottom");

var yAxis = d3.svg.axis()
							.scale(heightScale)
							.orient("left")
							.innerTickSize([0]);

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

d3.csv("water_improvement_data.csv", function(error, data) {

if (error) {
					console.log("error reading file");
				}

data.sort(function(a, b) {
					return d3.descending(+a.year2015, +b.year2015);
				});

// in this case, i know it's out of 100 because it's percents.
				widthScale.domain([0, 100]);

// js map: will make a new array out of all the d.name fields
				heightScale.domain(data.map(function(d) { return d.name; } ));

// Make the faint lines from y labels to highest dot

var linesGrid = svg.selectAll("lines.grid")
					.data(data)
					.enter()
					.append("line");

linesGrid.attr("class", "grid")
					.attr("x1", margin.left)
					.attr("y1", function(d) {
						return heightScale(d.name) + heightScale.rangeBand()/2;
					})
					.attr("x2", function(d) {
						return margin.left + widthScale(+d.year2015);

})
					.attr("y2", function(d) {
						return heightScale(d.name) + heightScale.rangeBand()/2;
					});

// Make the dotted lines between the dots

var linesBetween = svg.selectAll("lines.between")
					.data(data)
					.enter()
					.append("line");

linesBetween.attr("class", "between")
					.attr("x1", function(d) {
						return margin.left + widthScale(+d.year1990);
					})
					.attr("y1", function(d) {
						return heightScale(d.name) + heightScale.rangeBand()/2;
					})
					.attr("x2", function(d) {
						return margin.left + widthScale(d.year2015);
					})
					.attr("y2", function(d) {
						return heightScale(d.name) + heightScale.rangeBand()/2;
					})
					.attr("stroke-dasharray", "5,5")
					.attr("stroke-width", function(d, i) {
						if (i == 7) {
							return "1";
						} else {
							return "0.5";
						}
					});

// Make the dots for 1990

var dots1990 = svg.selectAll("circle.y1990")
						.data(data)
						.enter()
						.append("circle");

dots1990
					.attr("class", "y1990")
					.attr("cx", function(d) {
						return margin.left + widthScale(+d.year1990);
					})
					.attr("r", heightScale.rangeBand()/2)
					.attr("cy", function(d) {
						return heightScale(d.name) + heightScale.rangeBand()/2;
					})
					.style("stroke", function(d){
						if (d.name === "The World") {
							return "black";
						}
					})
					.style("fill", function(d){
						if (d.name === "The World") {
							return "darkorange";
						}
					})
					.append("title")
					.text(function(d) {
						return d.name + " in 1990: " + d.year1990 + "%";
					});

// Make the dots for 2015

var dots2015 = svg.selectAll("circle.y2015")
						.data(data)
						.enter()
						.append("circle");

dots2015
					.attr("class", "y2015")
					.attr("cx", function(d) {
						return margin.left + widthScale(+d.year2015);
					})
					.attr("r", heightScale.rangeBand()/2)
					.attr("cy", function(d) {
						return heightScale(d.name) + heightScale.rangeBand()/2;
					})
					.style("stroke", function(d){
						if (d.name === "The World") {
							return "black";
						}
					})
					.style("fill", function(d){
						if (d.name === "The World") {
							return "#476BB2";
						}
					})
					.append("title")
					.text(function(d) {
						return d.name + " in 2015: " + d.year2015 + "%";
					});

// add the axes

svg.append("g")
					.attr("class", "x axis")
					.attr("transform", "translate(" + margin.left + "," + height + ")")
					.call(xAxis);

svg.append("g")
					.attr("class", "y axis")
					.attr("transform", "translate(" + margin.left + ",0)")
					.call(yAxis);

svg.append("text")
					.attr("class", "xlabel")
        	.attr("transform", "translate(" + (margin.left + width / 2) + " ," +
        				(height + margin.bottom) + ")")
        	.style("text-anchor", "middle")
        	.attr("dy", "12")
        	.text("Percent");

// Style one of the Y labels bold:

// a hack that works if you can unravel the selections - to style "The World" bold in the axis label, which is the 8th element:
        var allYAxisLabels = d3.selectAll("g.y.axis g.tick text")[0]; // un-nest array
        d3.select(allYAxisLabels[7]).style("font-weight", "bold");
        	// You could also use tick formatting to get a % sign on each axis tick

});

</script>

</body>
</html>

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