Small multiple area line charts

forked from emagee's block: More small multiples, repeated axes

forked from tomshanley's block: Small multiple area line charts

<!DOCTYPE html>
<meta charset="utf-8">
<style>

body {
  font: 10px Arial;
  margin: 0;
  
}
  
  svg {
    margin: 13px;
  }

.line {
  fill: none;
  stroke: #426789;
  stroke-width: 2px;
  }

.area {
  fill: #e8eef4;
}
  
g#xAxisG text, g#yAxisG text {
	stroke: none;
	fill: silver;
	font-size: 9px;
}

header, div#source {
	margin-left: 40px;
	margin-bottom: 38px;
}

</style>
<body>

var margin = {top: 8, right: 15, bottom: 20, left: 40},
    width = 180 - margin.left - margin.right,
    height = 120 - margin.top - margin.bottom;

var xScale = d3.scaleLinear()
    .range([0, width]);

var yScale = d3.scaleLinear()
    .range([height, 0]);
  
var yAxis = d3.axisLeft()
  .scale(yScale)
  .ticks(3);

var line = d3.line()
    .x(function(d) { return xScale(d.year); })
    .y(function(d) { return yScale(d.ratio); });

d3.csv("data-apartments.csv", convertTextToNumbers, function(error, data) {
  
  xScale.domain(d3.extent(data, function(d) { return d.year; }));
  yScale.domain([0,4]);
  
  // Nest data by subject.
  var cities = d3.nest()
      .key(function(d) { return d.city; })
  		.key(function(d) { return d.estimate; })
      .entries(data);
  
  console.log(cities)
  
  //var nz = cities.filter(function(d){ return d.key === "NZ" });
  cities = cities.filter(function(d){ return d.key !== "New Zealand" });
  
  // Add an SVG element for each city
  var svg = d3.select("#charts").selectAll("svg")
      .data(cities)
    .enter().append("svg")
      .attr("width", width + margin.left + margin.right)
      .attr("height", height + margin.top + margin.bottom)
    .append("g")
      .attr("transform", "translate(" + margin.left + "," + margin.top + ")");
  
 // Add the line path elements
  svg.selectAll(".estimate")
  .data(function(d){ return d.values; })
  .enter()
  .append("g")
  .append("path")
      .attr("class", "line")
      .attr("d", function(d) {return line(d.values); });

// Add a labels
  svg.append("text")
      .attr("x", (width + 10)/2)
      .attr("y", height - 85)
      .style("text-anchor", "middle")
      .style("font-size", "12px")
  		.text(function(d) { return d.key; });	
       
  svg.append("text")
  	.text(xScale.domain()[0])
      .attr("x", 0)
      .attr("y", height + 15)
      .style("text-anchor", "start")
      .style("font-size", "12px")
  
  svg.append("text")
  	.text(xScale.domain()[1])
      .attr("x", width)
      .attr("y", height + 15)
      .style("text-anchor", "end")
      .style("font-size", "12px")
      
  //add axes
	svg.append("g").attr("id", "yAxisG").call(yAxis);
	d3.selectAll("path.domain").remove();
	d3.selectAll("line").style("stroke", "silver");
	
});

function convertTextToNumbers(d) {
  d.year = +d.year;
  d.ratio = +d.ratio;
  return d;
}

</script>

https://d3js.org/d3.v4.min.js