D3 Examples - Barley Dot Plot with Wild Lines

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<!DOCTYPE html>
<meta charset="utf-8">
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<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js" charset="utf-8"></script>
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<style type="text/css">
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  .axis text {
    font-size: 12px;
    fill: #777;
  }
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  .axis path {
    display: none;
  }
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  .axis line {
    stroke-width:1px;
    stroke: #ccc;
    stroke-dasharray: 2px 2px;
  }
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  .yearOne {
    fill: none;
    stroke-width: 1px;
    stroke: red;
  }
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</style>
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<body>
</body>
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<script>
var margin = {top: 20, right: 40, bottom: 20, left: 150};
var width = 720 - margin.left - margin.right,
   height = 400 - margin.top - margin.bottom;
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var xScale = d3.scale.linear()
   .range([0, width]);
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var yScale = d3.scale.ordinal()
   .rangePoints([height, 0]);
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var xAxis = d3.svg.axis()
   .scale(xScale)
   .tickSize(-height)
   .tickPadding(8)
   .orient("bottom");
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var yAxis = d3.svg.axis()
   .scale(yScale)
   .tickSize(-width)
   .tickPadding(8)
   .orient("left");
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var svg = d3.select("body").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 + ")");
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d3.tsv("barley.tsv", ready)
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 function ready(error, data) {
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  if (error) return console.warn(error);
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 var sampleData = data.filter(function(d) { return d.site == 'Morris'; })
 var barleyYields = data.map(function(d) { return d.yield;})
 var maxYields = d3.max(barleyYields)
 var minYields = d3.min(barleyYields)
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xScale.domain([minYields, maxYields]);
yScale.domain(d3.set(sampleData.map(function(d) { return d.variety; })).values());
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 svg.append("g")
 .attr("class","y axis")
 // .attr("transform","translate(0," + height + ")")
 .call(yAxis);
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 svg.append("g")
 .attr("class","x axis")
 .attr("transform","translate(0," + height + ")")
 .call(xAxis);
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 var circleGroup = svg.selectAll(".yieldCircles")
    .data(sampleData)
  .enter()
    .append("g")
    .attr("class", "yieldCircles")
    .attr("class", function(d) {
      if(d.year === "1931"){
        return "yearOne";
      } else {
        return "yearTwo";
      }
    })
    .attr("transform", function(d) { return "translate(" + xScale(d.yield) + "," + yScale(d.variety) + ")"; });
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  circleGroup.append("circle")
    .attr("r", 3); 
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  var yearOneGroup = data.filter(function(d) { return d.year == '1931'; })
  var yearTwoGroup = data.filter(function(d) { return d.year == '1932'; })
  console.log(yearOneGroup)
  console.log(yearOneGroup)
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      // begin of drawing lines
  var line = d3.svg.line()
      .x(function(data){
        console.log(data)
        return xScale(data.yield);})
      .y(function(data){
        console.log(data)
        return yScale(data.variety);})
        .interpolate("linear");  
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  svg.append("path")
      .attr("d", function(d) { return line(sampleData)})
      .attr("transform", "translate(0,0)")
      .style("stroke-width", 2)
              .style("stroke", "steelblue")
              .style("fill", "none");
  // end of drawing lines
 
}
​
​
</script>
    