linechart d3

<!DOCTYPE html>
<html lang = "en">
	<head>
		<meta charset="utf-8">
		<title>Line chart of disease over time</title>
		<script src = "https://d3js.org/d3.v4.min.js"></script>
		<style type="text/css">

path {
			fill: none;
			stroke: slategrey;
		}
		</style>
	</head>
	<body>
		<h3> Linechart of Disease Count per Year </h3>
		<script type = "text/javascript">
			//Width and height"
			var w = 700;
			var h = 500;
			var barPadding = 1;
			var padding = 75;

var xScale = d3.scaleLinear();
				
			var yScale = d3.scaleLinear();
			
			var xAxis = d3.axisBottom()
							.scale(xScale)
							.ticks(7);

var yAxis = d3.axisLeft()
							.scale(yScale)
							.ticks(7);

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

var line = d3.line();

var rowConverter = function(d) {
				return {
					number: parseInt(d.number),
					year: parseInt(d.year)
				};
			}

var dataset;

d3.csv("health.csv", rowConverter, function(data) {
				dataset = d3.nest()
  					.key(function(d) { return d.year; })
  					.rollup(function(v) { return d3.sum(v, function(d) { return d.number; })})
  					.entries(data);

console.log(dataset);

xScale.domain([d3.min(dataset, function(d) {return d.key;}), d3.max(dataset, function(d) {return d.key;})])
					.rangeRound([padding,w-padding]);

yScale.domain([0,d3.max(dataset, function(d) { return d.value})])
					.range([h - padding, padding]);

line.x(function(d) {console.log(xScale(d.key));return xScale(d.key);})
					.y(function(d) {console.log(yScale(d.value)); return yScale(d.value);});

svg.append("path")
					.datum(dataset)
					.attr("class", "line")
					.attr("d", line);
				
				svg.append("g") 
					.attr("class", "axis") 
					.attr("transform", "translate(0," + (h-padding) + ")") 
					.call(xAxis);

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

svg.append("text") 
					.attr("transform", "translate (" + 15 + "," + (h/2) + ") rotate(-90)")
					.attr("text-anchor", "middle")
      				.text("Disease Count")
      				.attr("fill", "black");

svg.append("text") 
					.attr("x", w/2 )
					.attr("y", h - 10)
					.attr("text-anchor", "middle")
      				.text("Time")
      				.attr("fill", "black");

});

</script>
	</body>
</html>