d3.multiline.js

var draw = function(cities){
	var width = $(".linechart svg");
	var svg = d3.select(".linechart svg");
	
	var width = svg.node().width.baseVal.value;
	var height = svg.node().height.baseVal.value;

	var margin = {top: 20, right: 80, bottom: 30, left: 50},
	width = width - margin.left - margin.right,
	height = height - margin.top - margin.bottom,
	g = svg.append("g").attr("transform", "translate(" + margin.left + "," + margin.top + ")");

	var x = d3.time.scale().range([0, width]);
	var y = d3.scale.linear().range([height, 0]);

	var line = d3.svg.line()
		.x(function(d) {return x(d.date); })
		.y(function(d) { return y(d.decrement); });

	x.domain([new Date(2007,0,1), new Date(2016,0,1)]);

	y.domain([
		d3.min(cities, function(c) { return d3.min(c.series, function(d) { return d.decrement; }); }),
		d3.max(cities, function(c) { return d3.max(c.series, function(d) { return d.decrement; }); })
	]);

	var xAxis = d3.svg.axis().scale(x)
		.orient("bottom").ticks(5);

	var yAxis = d3.svg.axis().scale(y)
		.orient("left").ticks(5);

	g.append("g")
		.attr("class", "axis axis--x")
		.attr("transform", "translate(0," + height + ")")
		.call(xAxis);

	g.append("g")
		.attr("class", "axis axis--y")
		.call(yAxis)
	.append("text")
		.attr("transform", "rotate(-90)")
		.attr("y", 6)
		.attr("dy", "0.71em")
		.attr("fill", "#000")
		.text("Antal");

	var city = g.selectAll(".city")
	.data(cities)
	.enter().append("g")
	  .attr("class", "city");

	city.append("path")
	  .attr("class", "line")
	  .attr("d", function(d) {return line(d.series); })
	  //.style("stroke", function(d) { return z(d.id); });

	city.append("text")
	  .datum(function(d) { return {name: d.name, value: d.series[d.series.length - 1]}; })
	  .attr("transform", function(d) { return "translate(" + x(d.value.date) + "," + y(d.value.decrement) + ")"; })
	  .attr("x", 3)
	  .attr("dy", "0.35em")
	  .style("font", "10px sans-serif")
	  .text(function(d) {return d.name; });
};