D3 Examples - [Unlisted] Line Small Multiples

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<!DOCTYPE html>
<meta charset="utf-8">
<style>
​
body {
  font: 8px sans-serif;
  margin: 0;
}
​
.league {
  display: inline-block;
}
​
.teams {
  fill: none;
  stroke: #bfbfbf;
}
​
.axis line, 
.axis path { 
  fill: none;
  stroke: #000;
  stroke-opacity: .05;
  shape-rendering: crispEdges;
}
​
.tick.major line {
​
  stroke: steelblue;
​
}
​
.x.axis .tick text  {
​
  display: none;
}
​
.x.axis .tick.major text {
​
  display: block;
}
​
​
</style>
​
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js" charset="utf-8"></script>
​
<body>
​
<script>
​
  var margin = {top: 20, right: 20, bottom: 20, left: 50},
      width = 300 - margin.left - margin.right,
      height = 220 - margin.top - margin.bottom;
​
  var body = d3.select("body");
​
  var parseDate = d3.time.format("%Y-%m-%d").parse;
​
  var xScale = d3.time.scale()
    .range([0, width]);
​
  var yScale = d3.scale.linear()
    .range([height, 0]);
​
  var xAxis = d3.svg.axis()
    .scale(xScale)
    .ticks(d3.time.weeks)
    .tickSize(-height)
    .orient("bottom");
​
  var yAxis = d3.svg.axis()
    .scale(yScale)
    .orient("left");
​
  var line = d3.svg.line()
    .x(function(d) { return xScale(d.date); })
    .y(function(d) { return yScale(d.cumulative); });
​
  var divisionOrder = ['west','central','east'];
​
  d3.csv('data.csv', function(error, data) {
​
    if (error) throw error;
​
    data.forEach(function(d) { 
      d.win_loss = (d.result == 'W') ? 1 : -1;
      d.date = parseDate(d.date_str2);
​
    })
​
    xScale.domain(d3.extent(data, function(d) { return d.date; })).nice()
    yScale.domain([-60,60])
​
    var nestedGameData = d3.nest()
      .key(function(d) { return d.league; })
      .key(function(d) { return d.division; })
      .key(function(d) { return d.team; })
      .entries(data);
​
      // Get cumulative win/loss
      nestedGameData.forEach(function(league) {
        league.values.forEach(function(division) {
          division.values.forEach(function(team) {
            var counter = 0;
            team.values.forEach(function(d) {
              d.cumulative = counter + d.win_loss;
              counter = d.cumulative;
            })
          })
        })
​
        league.values.sort(function(a,b) {
            return divisionOrder.indexOf(a.key) - divisionOrder.indexOf(b.key);
        });
      });
​
    var leagueGroup = body.selectAll(".league")
        .data(nestedGameData)
        .enter().append("div")
          .attr("class", "league")
​
    leagueGroup.append("h2")
      .text(function(d) { return d.key; })
​
    var divisionGroup = leagueGroup.selectAll(".division")
        .data(function(d) { return d.values; })
        .enter().append("svg")
          .attr("class","division")
          .attr("width", width + margin.left + margin.right)
          .attr("height", height + margin.top + margin.bottom)
        .append("g")
          .attr("transform","translate(" + margin.left + "," + margin.top + ")")
​
    divisionGroup.append("text")
        .text(function(d) { return d.key; })
​
    divisionGroup.append("line")
      .attr("x1", 0)
      .attr("x2", width)
      .attr("y1", yScale(0))
      .attr("y2", yScale(0))
      .style("stroke","#000")
      .style("stroke-dasharray",1)
      .style("stroke-width",.25)
​
    divisionGroup.selectAll(".teams")
        .data(function(d) { return d.values; })
      .enter().append("path")
        .attr("class","teams")
        .attr("d", function(d) { return line(d.values); });
​
    divisionGroup.append("g")
      .attr("class", "x axis")
      .attr("transform","translate(0," + height + ")")
      .call(xAxis)
      .selectAll("g")
      .classed("major", function(d) {
        return d.getDate() <= 7;
      });
​
    divisionGroup.append("g")
      .attr("class", "y axis")
      .call(yAxis);
​
  })
​
</script>
​
    