D3 Examples - Scatterplot w/label selectors

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<!DOCTYPE html>
<meta charset="utf-8">
<style>
​
body {
  font: 10px sans-serif;
}
​
.axis path,
.axis line {
  fill: none;
  stroke: #000;
  shape-rendering: crispEdges;
}
​
.dot {
  stroke: #000;
}
​
.legend rect{
  cursor: pointer;
}
​
</style>
<body>
<script src="https://d3js.org/d3.v3.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.scale.linear()
    .range([0, width]);
​
var y = d3.scale.linear()
    .range([height, 0]);
​
var color = d3.scale.category10();
​
var xAxis = d3.svg.axis()
    .scale(x)
    .orient("bottom");
​
var yAxis = d3.svg.axis()
    .scale(y)
    .orient("left");
​
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.conventions = function(c){
  c = c || {}
​
  c.width  = c.width  || 900
  c.height = c.height || 460
​
  c.margin = c.margin || {top: 20, right: 20, bottom: 20, left: 25}
​
  c.parentSel = c.parentSel || d3.select('body')
​
  c.svg = c.svg || c.parentSel.append("svg")
      .attr("width", c.width + c.margin.left + c.margin.right)
      .attr("height", c.height + c.margin.top + c.margin.bottom)
    .append("g")
      .attr("transform", "translate(" + c.margin.left + "," + c.margin.top + ")")
​
  c.color   = c.color   || d3.scale.category10()
  c.x       = c.x       || d3.scale.linear().range([0, c.width])
  c.y       = c.y       || d3.scale.linear().range([c.height, 0])
  c.rScale  = c.rScale  || d3.scale.sqrt().range([5, 20])
  c.line    = c.line    || d3.svg.line()
​
​
  c.xAxis = c.xAxis || d3.svg.axis().scale(c.x).orient("bottom");
  c.yAxis = c.yAxis || d3.svg.axis().scale(c.y).orient("left")
​
​
  c.drawAxis = function(){
    c.svg.append("g")
        .attr("class", "x axis")
        .attr("transform", "translate(0," + c.height + ")")
        .call(c.xAxis);
​
    c.svg.append("g")
        .attr("class", "y axis")
        .call(c.yAxis);
  }
  
  return c
}
​
function ƒ(str){
  return function(object){
    return object[str]
  }
}
  
d3.selection.prototype.dataAppend = function(data, name){
  return this.selectAll(name)
      .data(data).enter()
    .append(name)
​
d3.tsv("data.tsv", function(error, data) {
  data.forEach(function(d) {
    d.sepalLength = +d.sepalLength;
    d.sepalWidth = +d.sepalWidth;
  });
​
  x.domain(d3.extent(data, function(d) { return d.sepalWidth; })).nice();
  y.domain(d3.extent(data, function(d) { return d.sepalLength; })).nice();
​
  svg.append("g")
      .attr("class", "x axis")
      .attr("transform", "translate(0," + height + ")")
      .call(xAxis)
    .append("text")
      .attr("class", "label")
      .attr("x", width)
      .attr("y", -6)
      .style("text-anchor", "end")
      .text("Sepal Width (cm)");
​
  svg.append("g")
      .attr("class", "y axis")
      .call(yAxis)
    .append("text")
      .attr("class", "label")
      .attr("transform", "rotate(-90)")
      .attr("y", 6)
      .attr("dy", ".71em")
      .style("text-anchor", "end")
      .text("Sepal Length (cm)")
​
  var dot = svg.selectAll(".dot")
                .data(data)
               .enter().append("circle")
                .attr("class", "dot")
                .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); })
                .attr("data-species", function (d) {
                  return d.species;
                });
​
  var legend = svg.selectAll(".legend")
                    .data(color.domain())
                  .enter().append("g")
                    .attr("class", "legend")
                    .attr("transform", function(d, i) { return "translate(0," + i * 20 + ")"; });
​
  legend.append("rect")
        .attr("x", width - 18)
        .attr("width", 18)
        .attr("height", 18)
        .style("fill", color)
        .on("click", function (d) {
          dot.transition().duration(750)
             .attr("opacity", function () {
                return (this.dataset.species === d) ? 1 : 0;
              });
        });
​
  legend.append("text")
        .attr("x", width - 24)
        .attr("y", 9)
        .attr("dy", ".35em")
        .style("text-anchor", "end")
        .text(function(d) { return d; });
​
  svg.select(".legend").append("rect")
                       .attr("x", width - 18)
                       .attr("transform", function () {
                          return "translate(0," + legend.data().length * 20 + ")";
                       })
                       .attr("width", 18)
                       .attr("height", 18)
                       .style("fill", "black")
                       .on("click", function (d) {
                          dot.transition().duration(750)
                             .attr("opacity", 1);
                       });
​
  svg.select(".legend").append("text")
                       .attr("x", width - 24)
                       .attr("y", 9)
                       .attr("transform", function () {
                          return "translate(0," + legend.data().length * 20 + ")";
                       })
                       .attr("dy", ".35em")
                       .style("text-anchor", "end")
                       .text("all");
  var c = d3.conventions()
  c.x.domain(d3.extent(data, ƒ('sepalWidth')))
  c.y.domain(d3.extent(data, ƒ('sepalLength')))
​
  c.drawAxis()
​
  c.svg.dataAppend(data, "circle.dot")
      .attr("r", 3.5)
      .attr("cx", ƒ('sepalWidth', c.x))
      .attr("cy", ƒ('sepalLength', c.y))
      .style("fill", ƒ('species', c.color))
      .call(d3.attachTooltip)
​
});
​
</script>
    