D3 Examples - Add series CSS class to scatter plot

Add series CSS class to scatter plot

This scatterplot is constructed from a TSV file storing the dimensions of sepals and petals of various iris flowers. The chart employs conventional margins and a number of D3 features:

d3.tsv - load and parse data

d3.scale.linear - x- and y-position encoding

d3.scale.ordinal - color encoding

d3.extent - compute domains

d3.svg.axis - display axes

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<body>
<script src="//d3js.org/d3.v4.min.js"></script>
<script>
var margin = {top: 20, right: 20, bottom: 30, left: 40},
    width = 960 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom;
var x = d3.scaleLinear().range([0, width]);
var y = d3.scaleLinear().range([height, 0]);
var color = d3.scaleOrdinal(d3.schemeCategory10);
var seriesArr = [];
​
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 + ")");
​
d3.tsv("data.tsv", function(d,i,col) {
  if(seriesArr.indexOf(d[col[0]]) === -1) {
    seriesArr.push( d[col[0]] );
  }
  return d;
}, function(data) {
   
  x.domain(d3.extent(data, function(d) { return d.sepalWidth; })).nice();
  y.domain(d3.extent(data, function(d) { return d.sepalLength; })).nice();
  svg.selectAll("circle")
      .data(data)
    .enter().append("circle")
      .attr("class", function(d) { return "series" + (seriesArr.indexOf(d.species) + 1); })
      .attr("r", 3.5)
      .attr("cx", function(d) { return x(d.sepalWidth); })
      .attr("cy", function(d) { return y(d.sepalLength); })
      .style("fill", function(d) { return color(d.species); });
});
</script>
</body>
    